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-adjusted per Rev. Proc. 2024-40). 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.
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.