CFA Level 1 · Module 04 Financial Statement Analysis · Chapter 9
Income tax is one of the largest expenses a profitable company reports, yet it is also the one most shaped by rules that have nothing to do with the accounting standards used for the rest of the statements. A company keeps its books under IFRS or US GAAP, but it computes what it owes the tax authority under a separate tax law, and those two rulebooks measure income differently. The gap between them is what makes the tax line interesting, and it is why a single reported profit figure can sit alongside a completely different taxable income and a tax expense that matches neither.
This reading builds the subject in order. First, it separates the four distinct quantities that the word tax can refer to, so that accounting profit, taxable income, taxes payable, and income tax expense never get confused again. Second, it splits the reasons the two rulebooks disagree into permanent differences, which never reverse, and temporary differences, which do, and it locates a temporary difference in the gap between the carrying amount and the tax base of an asset or a liability. Third, it shows how those temporary differences become deferred tax liabilities and deferred tax assets on the balance sheet, how they are measured, and when a valuation allowance cuts a deferred tax asset back. Fourth, it works through the effective, statutory, and cash tax rates and what pushes them apart. Fifth, it reads the disclosures, the deferred tax note and the statutory to effective reconciliation, that an analyst actually uses. Every company and every number below is invented by MidhaFin to teach the mechanics; none is taken from the source curriculum or any prep provider. Concepts, definitions, and formulas are shared knowledge and are used freely.
The single most common error on this reading is to treat the word tax as if it meant one thing. It does not. Four separate quantities live around the tax line, and each is computed differently, from a different starting point, under a different rulebook. Getting them straight is most of the battle.
Accounting profit, also called pretax financial income or pretax income, is the profit before tax that appears on the income statement, measured under the accounting standards (IFRS or US GAAP). It is what the books say the company earned.
Taxable income is the income figure computed under the tax law and reported on the tax return. It starts from accounting profit but adjusts it for every place the tax law measures income differently, adding back expenses the tax law does not allow, removing income the tax law does not tax, and swapping book depreciation for tax depreciation.
Taxes payable, also called the current tax expense, is the actual tax owed to the authority for the period. It is taxable income multiplied by the tax rate. This is the amount that legally becomes a liability to the government for the year.
Income tax expense is the number that sits on the income statement and reduces net income. It is not the same as taxes payable. It equals the current tax expense plus the change in deferred taxes for the period, so it captures both the tax owed now and the future tax consequences of this year’s temporary differences.
where taxable income is measured under the tax law on the tax return, not under the accounting standards. This is the amount the company actually owes the tax authority for the period.
where current tax expense is taxes payable for the year, and the deferred terms are the net change in deferred tax liabilities and deferred tax assets over the period. Income tax expense is the income-statement figure; taxes payable is the tax-return figure; they differ by the change in deferred taxes.
| Quantity | Measured under | What it is |
|---|---|---|
| Accounting profit | Accounting standards (books) | Pretax income on the income statement |
| Taxable income | Tax law (tax return) | Income the tax authority taxes |
| Taxes payable (current tax) | Tax law (tax return) | Taxable income × tax rate; owed now |
| Income tax expense | Accounting standards (books) | Current tax + change in deferred taxes |
The cleanest way to feel the difference is to build all four from a single scenario. The next example does exactly that, using one permanent difference and one temporary difference so that every quantity comes out distinct.
Setup. Tessellate Tiles, an invented company, reports accounting profit before tax of 5,000,000. Inside that figure are two items the tax law treats differently. First, it earned 200,000 of interest that is tax-exempt, so it is income in the books but is never taxed. Second, it paid a regulatory fine of 100,000 that is recorded as an expense in the books but is not deductible for tax. Separately, book depreciation for the year is 600,000 while tax depreciation is 1,000,000. The tax rate is 25%. Compute accounting profit, taxable income, taxes payable, and income tax expense.
Answer: accounting profit is 5,000,000, taxable income is 4,500,000, taxes payable is 1,125,000, and income tax expense is 1,225,000. So what do these numbers mean? Tessellate owes the authority 1,125,000 in cash tax this year, but its income statement is charged 1,225,000, the extra 100,000 being the future tax on the depreciation timing difference that has been pushed forward, not escaped. The two permanent items, in contrast, are gone for good: they move the effective rate to 1,225,000 ÷ 5,000,000 = 24.5%, just under the 25% statutory rate, and they never create a deferred item because they never reverse.
Read the tax line as two questions, not one. Taxes payable answers what the company owes the government this year, computed on taxable income. Income tax expense answers what the income statement should be charged, computed on the book profit adjusted only for permanent differences. The bridge between them is the change in deferred taxes, which is entirely the work of temporary differences. If you can separate a permanent difference from a temporary one, you can always rebuild all four numbers.
Every reason accounting profit and taxable income disagree falls into one of two buckets, and the whole of deferred tax accounting turns on telling them apart.
A permanent difference is an item that enters one measure of income but never the other, in any period. It does not reverse. Common examples are income that is recognized in the books but is never taxable (such as certain tax-exempt interest) and expenses that are recorded in the books but are never deductible (such as fines, penalties, or some entertainment costs). Because a permanent difference never turns around, it creates no deferred tax item. Its only effect is to move the effective tax rate away from the statutory rate: income that is not taxed lowers the effective rate, and expenses that are not deductible raise it.
A temporary difference is a timing item. The same amount of income or expense is recognized under both rulebooks, but in different periods, so a difference opens up now and reverses later. Depreciation is the classic case: the total depreciation over an asset’s life is identical in the books and on the tax return, but if the tax return front-loads it, the tax deduction is larger early and smaller late. Because a temporary difference reverses, it carries a future tax consequence, and that consequence is recorded now as a deferred tax liability or a deferred tax asset.
The formal source of a temporary difference is the gap between two balance-sheet measures of the same item. The carrying amount is the value of an asset or a liability on the balance sheet under the accounting standards. The tax base is the value of that same asset or liability for tax purposes, that is, the amount that will be deductible or taxable in the future as the item is recovered or settled. When the two measures differ, a temporary difference exists.
where the tax base of an asset is the amount that will be deductible against future taxable income as the asset is used or sold, and the tax base of a liability is its carrying amount minus any amount that will be deductible for tax in the future. A non-zero difference is a temporary difference that generates a deferred tax item.
The direction of the difference decides whether a liability or an asset results, and the rule flips between assets and liabilities. The following table is worth memorizing as a block.
| Item | Relationship | Type of difference | Deferred item |
|---|---|---|---|
| Asset | Carrying amount > tax base | Taxable temporary difference | Deferred tax liability |
| Asset | Carrying amount < tax base | Deductible temporary difference | Deferred tax asset |
| Liability | Carrying amount > tax base | Deductible temporary difference | Deferred tax asset |
| Liability | Carrying amount < tax base | Taxable temporary difference | Deferred tax liability |
Setup. Halden Freight, an invented company, buys a vehicle for 1,000,000. After one year, book depreciation (straight line) has reduced the carrying amount to 800,000, while the tax authority has allowed faster depreciation, leaving a tax base of 700,000. The tax rate is 25%. Identify the temporary difference and the deferred item.
Answer: the temporary difference is 100,000 and it produces a deferred tax liability of 25,000. So what does this number mean? The tax authority has already let Halden deduct more of the vehicle’s cost than the books have expensed, so tax has been saved early. That saving is not permanent: as the asset ages, book depreciation will exceed tax depreciation and the difference will reverse, at which point the extra tax comes due. The 25,000 deferred tax liability is the balance sheet’s record of that future bill.
Do not assume that a bigger tax deduction now means the company paid less tax overall. A temporary difference changes only the timing of tax, not its total. Over the full life of the asset, book and tax depreciation add to the same amount, so every unit of tax deferred early is repaid later as the difference reverses. Treating a deferral as a permanent saving overstates value and misreads the deferred tax liability, which exists precisely because the bill has not gone away.
A deferred tax liability (DTL) is the tax the company will pay in the future on temporary differences that have reduced tax now. It is a taxable temporary difference multiplied by the tax rate. The textbook cause is accelerated tax depreciation: the tax return depreciates an asset faster than the books, so early taxable income is lower than accounting profit, tax paid now is lower, and the deferred tax liability records the tax that will be paid later when the pattern reverses.
A deferred tax asset (DTA) is the tax the company will save in the future on temporary differences that have raised tax now, or on losses it can carry forward. It is a deductible temporary difference (or an unused tax loss) multiplied by the tax rate. Two common sources are an accrued expense that the books recognize now but the tax law only allows when it is paid (for example a warranty provision), and a tax loss carryforward, where a past loss can be used to reduce taxable income, and therefore tax, in a future profitable year.
where a taxable temporary difference gives a deferred tax liability and a deductible temporary difference or a loss carryforward gives a deferred tax asset. The rate used is the rate expected to apply when the difference reverses, which is the enacted future rate.
The flagship case is a deferred tax liability created by faster tax depreciation, watched over the whole life of the asset so that its creation and its reversal are both visible. The next example follows one asset from purchase to full depreciation.
Setup. Northwind Logistics, an invented company, buys equipment for 1,200,000 at the start of Year 1. It has a three-year life and no residual value. The books use straight-line depreciation of 400,000 per year. The tax authority allows accelerated depreciation of 700,000 in Year 1, 300,000 in Year 2, and 200,000 in Year 3. The tax rate is 25%. Track the carrying amount, the tax base, the cumulative temporary difference, and the deferred tax liability at each year end, and show how the deferred tax liability is created and then reverses.
Answer: the deferred tax liability builds to 75,000 by the end of Year 1, then reverses to 50,000 in Year 2 and to zero in Year 3. So what does this number mean? In Year 1 Northwind pays only 175,000 in cash tax even though its income statement is charged 250,000, and the 75,000 gap is parked on the balance sheet as a deferred tax liability. In Years 2 and 3 book depreciation now exceeds tax depreciation, taxable income runs above accounting profit, cash tax runs above the income-statement charge, and the liability drains back to zero. The total tax over three years is identical to what it would have been with no timing difference; only the schedule of payment moved.
| Year end | Carrying amount | Tax base | Temporary difference | DTL at 25% | Change in DTL |
|---|---|---|---|---|---|
| Start | 1,200,000 | 1,200,000 | 0 | 0 | – |
| Year 1 | 800,000 | 500,000 | 300,000 | 75,000 | +75,000 |
| Year 2 | 400,000 | 200,000 | 200,000 | 50,000 | −25,000 |
| Year 3 | 0 | 0 | 0 | 0 | −50,000 |
Now the mirror image. A deductible temporary difference produces a deferred tax asset, and the most intuitive source is an expense the books recognize before the tax law allows it. When a company accrues a cost today but can only deduct it for tax when it is paid, taxable income this year is higher than accounting profit, so the company pays more tax now and expects to save tax later. That future saving is the deferred tax asset.
Setup. Bluepeak Appliances, an invented company, sells products with a warranty. In Year 1 it recognizes a warranty expense of 400,000 in the books, setting up a warranty provision (a liability) of 400,000. The tax law allows a warranty deduction only when claims are actually paid, and no claims were paid in Year 1. The tax rate is 25%. Identify the temporary difference and the deferred tax item.
Answer: the deductible temporary difference is 400,000 and it creates a deferred tax asset of 100,000. So what does this number mean? Because Bluepeak cannot deduct the warranty until it pays claims, its Year 1 taxable income is 400,000 higher than its accounting profit, so it pays 100,000 more cash tax now than the income statement charge implies. That overpayment is not lost: when the claims are paid in later years and become deductible, taxable income will fall below accounting profit and the tax will come back. The 100,000 deferred tax asset is the balance sheet’s claim on that future refund of tax.
Anchor the two items to cash timing. A deferred tax liability means the company has paid less tax so far than its book profit suggests, so tax is owed later: pay now low, pay later. A deferred tax asset means the company has paid more tax so far than its book profit suggests, so tax is saved later: pay now high, save later. If you can decide whether this year’s tax was pushed forward or pulled forward, you know instantly whether the item is a liability or an asset without touching the carrying-amount table.
Deferred tax items are measured at the tax rate expected to apply when the difference reverses, which in practice is the enacted future rate. This matters because tax rates change. When a new rate is enacted, every existing deferred tax balance is remeasured at the new rate, and the adjustment runs through income tax expense in the period of enactment, even though no temporary difference reversed. A rate cut shrinks a deferred tax liability, which reduces income tax expense and lifts net income; a rate rise does the opposite.
Setup. Return to Northwind Logistics at the end of Year 1, when its deferred tax liability stands at 75,000, built on a temporary difference of 300,000 at a 25% rate. Early in Year 2, before any reversal, the government enacts a new tax rate of 20% for future periods. Show the effect of the rate change on the deferred tax liability and on income tax expense.
Answer: the rate cut lowers the deferred tax liability from 75,000 to 60,000 and cuts income tax expense by 15,000. So what does this number mean? Nothing about the equipment or the timing difference changed; only the future rate did. Because the deferred liability is a future tax bill, a lower future rate makes that bill smaller, and the saving is booked immediately through the tax line. An analyst should strip this one-time, non-operating benefit out before reading Northwind’s underlying tax burden, because it will not recur.
A deferred tax asset is only worth something if the company earns enough future taxable income to use it. When realization is in doubt, accounting reduces the asset. Under US GAAP a valuation allowance is recorded against the deferred tax asset to bring it down to the amount that is more likely than not to be realized; under IFRS the deferred tax asset is recognized in the first place only to the extent realization is probable, which reaches a similar result by a different route. Either way, the carrying value of the deferred tax asset reflects management’s judgment about future profitability, and changes in that judgment flow through income tax expense.
Setup. Cairn Robotics, an invented start-up, has accumulated tax losses it may carry forward of 2,000,000, and the tax rate is 25%. Because the company is young and its future profits are uncertain, management judges that only 1,200,000 of the losses are more likely than not to be used before they expire. Compute the gross deferred tax asset, the valuation allowance, and the net deferred tax asset.
Answer: the gross deferred tax asset is 500,000, the valuation allowance is 200,000, and the net deferred tax asset is 300,000. So what does this number mean? Cairn believes it can shelter only 1,200,000 of future profit with its past losses, so only 300,000 of tax benefit is carried as an asset. The valuation allowance is a direct read on management’s own confidence: if profitability improves and the allowance is later released, income tax expense falls and earnings jump, whereas if prospects worsen and the allowance is increased, earnings are depressed. An analyst watches allowance changes closely because they can swing reported earnings without any change in the operating business.
Do not read a valuation-allowance release as improved operating performance. Releasing an allowance raises the net deferred tax asset and cuts income tax expense, which lifts net income, but it is an accounting recognition of better tax prospects, not a rise in sales or margins. The reverse trap is a fresh allowance charge that depresses earnings even though the operating business is unchanged. Always separate the tax-line swing from the operating result.
Finally, the analyst must decide how to classify a deferred tax liability for ratio purposes, because the balance-sheet label is not always the economic truth. The rule of thumb is about reversal. If a deferred tax liability is expected to reverse in the foreseeable future, for example because the underlying asset base is stable and the timing difference will unwind, it is treated as a genuine liability, a real future cash outflow. But if the deferred tax liability is unlikely to reverse, because the company keeps investing so that new temporary differences constantly replace the reversing ones and the balance only grows, the future outflow never actually arrives, and analysts may treat it as equity instead. The choice is not cosmetic: reclassifying a large deferred tax liability from debt to equity lowers measured leverage and changes solvency ratios.
For the deferred-tax-liability classification question, tie the answer to one word: reversal. Expected to reverse, treat as a liability. Not expected to reverse (it keeps growing as the firm keeps investing), treat as equity. A common variant asks what happens to the debt-to-equity ratio when the liability is reclassified as equity: debt falls, equity rises, so the ratio drops. Do not overthink the accounting; the exam wants the reversal test and the direction of the ratio effect.
Three tax rates describe a company, and confusing them is a reliable way to misjudge its tax burden. Each has a precise definition.
The statutory tax rate is the legislated rate set by the tax authority in the jurisdiction where the company is based. It is a given number, not something computed from the financial statements.
The effective tax rate is income tax expense divided by pretax accounting profit. It is the average rate the income statement bears, and it differs from the statutory rate whenever permanent differences, foreign operations taxed at other rates, or valuation-allowance changes are present.
The cash tax rate is cash taxes actually paid divided by pretax accounting profit. It captures what the company really handed to the tax authority in cash, which differs from the effective rate because income tax expense includes the non-cash deferred portion.
where income tax expense is the income-statement figure including the deferred portion. The effective rate is the average book tax rate and is the one most directly comparable across companies once permanent items are understood.
where cash taxes paid is the actual cash outflow to tax authorities in the period. The gap between the effective rate and the cash rate is driven mainly by deferred taxes, which are recorded in expense but not paid in cash in the same period.
Setup. Solara Foods, an invented company, reports pretax accounting profit of 4,000,000 and income tax expense of 900,000. During the year it actually paid 840,000 in cash to the tax authority. The statutory rate in its home country is 25%. Compute and contrast the effective, statutory, and cash tax rates, and explain what drives the gaps.
Answer: the statutory rate is 25%, the effective rate is 22.5%, and the cash tax rate is 21.0%. So what do these numbers mean? Solara’s income statement is taxed at an average 22.5%, below the headline 25% because permanent differences and rate effects shelter some profit for good. But the company parted with even less cash, an effective 21.0%, because some of the booked tax was deferred to the future rather than paid now. Reading all three together tells the analyst both how heavily book profit is taxed and how much of that tax is actually leaving the business as cash.
| Rate | Definition | Value |
|---|---|---|
| Statutory | Legislated rate in the home jurisdiction | 25.0% |
| Effective | Income tax expense ÷ pretax profit | 22.5% |
| Cash | Cash taxes paid ÷ pretax profit | 21.0% |
What drives a persistent gap between the statutory and effective rates? Four causes cover most cases: permanent differences (tax-exempt income lowers the effective rate, non-deductible expenses raise it); changes in the valuation allowance (a release lowers it, a fresh charge raises it); foreign-rate differences (income earned where rates are lower pulls the effective rate down, higher-rate jurisdictions push it up); and timing and one-off items such as the remeasurement of deferred balances when a rate is enacted. A gap between the effective and the cash rate, by contrast, is chiefly a deferred-tax story: a growing net deferred tax liability means cash tax is running below book tax expense, while a shrinking one means the reverse.
Two disclosures turn the tax note into an analytical tool. The first is the deferred tax note, which breaks the deferred tax balances into their components, showing which assets and liabilities each temporary difference produced (depreciation, provisions, losses carried forward, and so on) and the amount of any valuation allowance. Reading it tells an analyst where the deferrals come from, whether the deferred tax liability is the kind that keeps growing (recurring capital investment) or the kind that will reverse, and how much of the company’s deferred tax assets management has judged unrealizable.
The second, and the more heavily tested, is the effective tax rate reconciliation, which bridges the statutory rate to the effective rate line by line, quantifying each cause of the gap. It can be presented in currency amounts or in percentage points, and it lets an analyst see exactly how much of a low effective rate is durable (a structural foreign-rate advantage) and how much is fragile or one-off (a valuation-allowance release that will not repeat).
Setup. Meridian Pharma, an invented company, reports pretax accounting profit of 8,000,000 with a statutory rate of 25%. Its tax note reconciles the statutory tax to the reported income tax expense with four items: tax-exempt income reduces tax by 120,000; non-deductible expenses add 80,000; income earned abroad at a lower rate reduces tax by 200,000; and a release of a valuation allowance reduces tax by 160,000. Build the reconciliation, find income tax expense, and compute the effective tax rate.
Answer: income tax expense is 1,600,000 and the effective tax rate is 20.0%, five points below the 25% statutory rate. So what does this number mean? The reconciliation shows that most of Meridian’s rate advantage is structural, the tax-exempt income and the foreign-rate benefit together worth 4.0 points, and these are likely to persist. But 2.0 of the 5.0 points come from a valuation-allowance release, which is a one-time event; strip it out and the sustainable effective rate is closer to 22.0%. An analyst who took the reported 20.0% at face value would understate Meridian’s normal future tax burden.
| Item | Amount | Rate effect |
|---|---|---|
| Tax at statutory rate | 2,000,000 | 25.0% |
| Tax-exempt income | −120,000 | −1.5% |
| Non-deductible expenses | +80,000 | +1.0% |
| Foreign income at lower rate | −200,000 | −2.5% |
| Valuation-allowance release | −160,000 | −2.0% |
| Income tax expense (effective) | 1,600,000 | 20.0% |
These disclosures also shape the ratios an analyst reports. Because income tax expense feeds net income, the split between current and deferred tax changes the quality, though not the amount, of reported earnings: profit propped up by a valuation-allowance release or a rate-change benefit is lower quality than profit from operations. On the balance sheet, whether a large deferred tax liability is counted as debt or as equity moves the debt-to-equity and other solvency ratios directly, as the earlier classification discussion showed. An analyst who reads the tax note can adjust for both effects; one who reads only the single tax line on the face of the income statement cannot.
Use the rate reconciliation to forecast, not just to explain. Sort each reconciling item into durable or one-off. Structural items (a permanent foreign-rate advantage, recurring tax-exempt income) will persist, so keep them in the forward effective rate. One-off items (a valuation-allowance release, a rate-change remeasurement, a one-year credit) will not, so remove them to estimate the sustainable rate the company will actually pay next year. The reported effective rate is the past; the durable part of the reconciliation is the future.
A company reports accounting profit before tax of 2,000,000, which includes 100,000 of tax-exempt income and no other differences. At a 25% tax rate, what are its income tax expense and its effective tax rate?
The tax-exempt income is a permanent difference, so it is removed to find taxable income and it creates no deferred item. Taxable income = 2,000,000 − 100,000 = 1,900,000, and income tax expense = 1,900,000 × 25% = 475,000. The effective tax rate = 475,000 ÷ 2,000,000 = 23.75%, below the 25% statutory rate because the exempt income is never taxed.
An asset has a carrying amount of 500,000 and a tax base of 350,000. At a 20% tax rate, does this create a deferred tax asset or a deferred tax liability, and how much?
For an asset, a carrying amount above the tax base is a taxable temporary difference, which creates a deferred tax liability. The temporary difference is 500,000 − 350,000 = 150,000, so the deferred tax liability = 150,000 × 20% = 30,000. This is the classic accelerated-tax-depreciation pattern, where more of the asset has been deducted for tax than for the books.
A warranty provision (a liability) has a carrying amount of 200,000 and a tax base of 0. At a 25% tax rate, what deferred item results?
For a liability, a carrying amount above the tax base is a deductible temporary difference, which creates a deferred tax asset. The difference is 200,000 − 0 = 200,000, so the deferred tax asset = 200,000 × 25% = 50,000. The company has been taxed on income now that will be sheltered when the warranty claims are paid and become deductible, and the asset records that future saving.
A company’s current tax expense (taxes payable) is 600,000, and during the year its deferred tax liability increased by 90,000 with no change in deferred tax assets. What is income tax expense?
Income tax expense = current tax expense + increase in the deferred tax liability = 600,000 + 90,000 = 690,000. The income statement is charged more than the cash tax owed because a new temporary difference deferred 90,000 of tax to the future; that deferral is a non-cash addition to this year’s tax expense.
A company has tax loss carryforwards of 1,000,000 at a 25% rate, but management judges only half of the benefit is more likely than not to be realized. What are the gross deferred tax asset, the valuation allowance, and the net deferred tax asset?
Gross deferred tax asset = 1,000,000 × 25% = 250,000. Because only half is expected to be realized, a valuation allowance of 250,000 × 50% = 125,000 is recorded, leaving a net deferred tax asset of 250,000 − 125,000 = 125,000. The allowance is management’s statement that half of the loss benefit is unlikely to be used before it expires.
A company reports pretax accounting profit of 3,000,000 and income tax expense of 660,000. What is its effective tax rate, and name one reason it might sit below a 25% statutory rate.
Effective tax rate = 660,000 ÷ 3,000,000 = 22.0%, which is below the 25% statutory rate. A permanent difference such as tax-exempt income, income earned in a lower-rate foreign jurisdiction, or a release of a valuation allowance could each pull the effective rate below the statutory rate. Non-deductible expenses would push it the other way.
A company paid 500,000 in cash taxes during a year in which pretax accounting profit was 2,500,000. What is its cash tax rate, and how does it differ conceptually from the effective tax rate?
Cash tax rate = 500,000 ÷ 2,500,000 = 20.0%. The cash tax rate uses cash actually paid in the numerator, whereas the effective tax rate uses income tax expense, which includes the non-cash deferred portion. When deferred tax liabilities are growing, cash paid runs below book tax expense, so the cash tax rate is lower than the effective tax rate.
Taxes payable, also called the current tax expense, is the actual tax owed to the authority for the period, computed as taxable income (from the tax return) times the tax rate. Income tax expense is the figure on the income statement, computed as the current tax expense plus the change in deferred taxes for the period. They differ whenever temporary differences change the deferred tax balances: if a deferred tax liability grows, income tax expense exceeds taxes payable by the increase; if a deferred tax asset grows, income tax expense is below taxes payable. Permanent differences, by contrast, affect both equally and do not create a gap between the two.
No. A permanent difference is an item that enters one measure of income but never the other and never reverses, such as tax-exempt income or a non-deductible fine. Because it never turns around, there is no future tax consequence to record, so it creates no deferred tax liability and no deferred tax asset. Its only effect is to move the effective tax rate away from the statutory rate: tax-exempt income lowers the effective rate, and non-deductible expenses raise it. Only temporary differences, which reverse over time, create deferred tax items.
A deferred tax liability arises from a taxable temporary difference, where tax has been deferred to the future. The classic cause is accelerated tax depreciation: the tax return depreciates an asset faster than the books, so the carrying amount of the asset exceeds its tax base, tax paid now is lower, and the future tax is recorded as a liability. A deferred tax asset arises from a deductible temporary difference or an unused tax loss. Common sources are an expense the books recognize before the tax law allows it (such as a warranty provision) and tax loss carryforwards. In each case the company has paid more tax now than book profit implies and expects to save tax later.
The tax base is the value of an asset or a liability for tax purposes, as opposed to its carrying amount under the accounting standards. The tax base of an asset is the amount that will be deductible against future taxable income as the asset is used or sold; for a depreciable asset it is cost minus accumulated tax depreciation. The tax base of a liability is its carrying amount minus any amount that will be deductible for tax in the future; for a warranty provision that is only deductible when paid, the tax base is zero. A temporary difference is simply the carrying amount minus the tax base, and it is what generates a deferred tax item.
A valuation allowance is a reduction, under US GAAP, of a deferred tax asset down to the amount that is more likely than not to be realized. A deferred tax asset only has value if the company earns enough future taxable income to use it, so when realization is doubtful the allowance writes part of it off. Under IFRS the same idea is applied by recognizing the deferred tax asset in the first place only to the extent realization is probable. The allowance is a direct read on management confidence in future profitability: increasing it depresses earnings, and releasing it later lifts earnings, in both cases through income tax expense and without any change in the operating business.
The statutory rate is the legislated rate, while the effective tax rate is income tax expense divided by pretax accounting profit, so anything that makes book tax expense differ from the statutory rate applied to book profit creates a gap. The main drivers are permanent differences (tax-exempt income lowers the effective rate, non-deductible expenses raise it), income earned in foreign jurisdictions taxed at other rates, changes in a valuation allowance, and one-off items such as the remeasurement of deferred balances when a new rate is enacted. The effective tax rate reconciliation in the notes quantifies each of these, letting an analyst see how much of the gap is structural and durable and how much is one-off.
It depends on whether the liability is expected to reverse. If a deferred tax liability will reverse in the foreseeable future, for example because the underlying asset base is stable and the timing difference will unwind, it is a genuine future cash outflow and is treated as a liability. But if the company keeps investing so that new temporary differences constantly replace the reversing ones, the balance only grows and the outflow never actually arrives; in that case analysts may treat the deferred tax liability as equity. The choice matters because reclassifying a large deferred tax liability from debt to equity lowers measured leverage and improves solvency ratios.
The effective tax rate is income tax expense divided by pretax accounting profit, and it includes the deferred (non-cash) portion of tax. The cash tax rate is cash taxes actually paid divided by pretax accounting profit, and it captures only what left the business in cash. The two differ because of deferred taxes: when net deferred tax liabilities are growing, cash paid runs below book tax expense, so the cash tax rate is lower than the effective rate, and when they are shrinking the reverse holds. Reading both together tells an analyst how heavily book profit is taxed and how much of that tax is actually being paid in cash now.
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