Taxable Income
The portion of your income that is actually subject to federal income tax, calculated by subtracting the standard or itemized deduction from your AGI.
Taxable income is the amount used to calculate how much federal income tax you owe. You arrive at it by taking your Adjusted Gross Income (AGI) and subtracting either the standard deduction or your total itemized deductions, plus any qualified business income (QBI) deduction if applicable.
For 2025, the standard deduction is $15,750 for single filers and $31,500 for married filing jointly (OBBBA-increased under § 70102; see Rev. Proc. 2025-32 § 2.08). If your itemized deductions — such as mortgage interest, state and local taxes, and charitable contributions — exceed the standard deduction, itemizing will lower your taxable income further.
Once you know your taxable income, you apply the federal tax brackets to determine your tax liability. The progressive bracket system means only the income within each bracket is taxed at that bracket's rate, not your entire income.
How it works
Taxable income is the figure the IRS actually applies tax brackets to — it is not your gross income and not your AGI, but a further step down. You get there by taking your Adjusted Gross Income and subtracting either the standard deduction or your total itemized deductions, whichever is larger, and then subtracting any qualified business income (QBI) deduction you are entitled to if you have pass-through business income. Everything above that line — wages, investment income, adjustments — has already been accounted for by the time you reach taxable income.
On Form 1040, taxable income sits on its own line near the bottom of the first page, right before the tax calculation itself. For 2025, a single filer subtracts a standard deduction of $15,750 from AGI unless itemizing on Schedule A produces a larger number; a married couple filing jointly subtracts $31,500 under the same logic. Once taxable income is set, tax software or the IRS tax tables apply the bracket structure to it, layer by layer, to compute your tax before credits.
People sometimes assume their whole taxable income is taxed at their top bracket rate, but the bracket system is graduated — only the income within each bracket is taxed at that bracket's rate, which is why effective tax rates are usually well below the marginal rate. It is also easy to conflate taxable income with AGI: AGI still includes the standard or itemized deduction ahead of it, so a taxpayer who is AGI-limited out of a credit is not automatically taxable-income-limited out of the same benefit, since the two figures are measured at different points in the return.
Example: from AGI to taxable income
A single filer has AGI of $70,000 for 2025 and does not itemize, so they take the $15,750 standard deduction.
Subtracting $15,750 from $70,000 leaves taxable income of $54,250. That $54,250 figure — not the original $70,000 — is what the federal tax brackets are applied to when calculating the filer's tax liability.
Frequently asked questions
Is taxable income the same as AGI?
Does a higher taxable income mean my whole income is taxed at a higher rate?
Should I use the standard deduction or itemize to reduce my taxable income?
Related Terms
Adjusted Gross Income (AGI)
Your gross income minus specific adjustments such as student loan interest, IRA contributions, and self-employment tax. AGI is the starting point for calculating your taxable income.
Standard Deduction
A fixed dollar amount that reduces your taxable income, available to all filers who do not itemize. For 2025, it is $15,750 for single filers and $31,500 for married filing jointly (OBBBA-adjusted).
Itemized Deduction
Specific expenses you can deduct instead of taking the standard deduction, including mortgage interest, state/local taxes (SALT cap: $40,000 for 2025+ under OBBBA, phased out for high earners), charitable donations, and medical expenses.
Tax Bracket
A range of income taxed at a specific rate. The US uses a progressive system with seven brackets ranging from 10% to 37% for 2025.