How do I reduce my taxable income?

You can reduce taxable income by maximizing pre-tax retirement contributions (401(k), IRA, HSA), claiming all eligible deductions, and structuring business expenses correctly. Legal tax reduction uses deductions and exclusions the IRS already allows — not evasion.

Taxable income is your gross income minus all allowable deductions and adjustments. The IRS provides dozens of legal mechanisms to reduce it — from contributing to a pre-tax 401(k) to deducting student loan interest. None of these are loopholes; they are provisions Congress wrote into the tax code, documented in IRS Publication 17 (Your Federal Income Tax). Reducing taxable income is distinct from tax evasion (which is illegal) and is part of routine tax planning for most households.

Pre-tax retirement contributions

Contributions to a traditional 401(k), traditional IRA, SEP-IRA, or SIMPLE IRA reduce your taxable income in the year you contribute. For traditional 401(k) plans, you contribute pre-tax dollars directly from your paycheck; for a traditional IRA, you may be able to deduct contributions depending on your income and whether you (or your spouse) have a workplace plan. Check the current annual contribution limits and phase-out ranges on the IRS retirement plans page.

Above-the-line deductions (Schedule 1 adjustments)

HSA contributions: If enrolled in a qualifying high-deductible health plan, contributions to a Health Savings Account are fully deductible and reduce AGI. See IRS Publication 969.
Self-employment deductions: Half of self-employment tax, self-employed health insurance premiums, and SEP-IRA or SIMPLE IRA contributions are all deductible as Schedule 1 adjustments.
Student loan interest: Up to $2,500 per year of student loan interest may be deductible, subject to income phase-outs.
Alimony (pre-2019 divorces): Deductible for the payer under pre-TCJA agreements.
Educator expenses: K–12 educators can deduct up to $300 in unreimbursed classroom expenses.

Standard vs. itemized deductions

Every filer chooses between the standard deduction (a fixed amount based on filing status) and itemized deductions (Schedule A). For 2025, the standard deduction is $15,000 for single filers and $30,000 for married filing jointly. If your itemized deductions — mortgage interest, state and local taxes (SALT, capped at $10,000), charitable contributions, and qualifying medical expenses — exceed the standard deduction, itemizing saves more. Most filers take the standard deduction. See IRS Topic 551 for the current amounts.

IRS deduction facts

Contributions to a traditional IRA may be deductible depending on the taxpayer's income, filing status, and whether they are covered by a retirement plan at work. — IRS — IRA Deduction Limits
Contributions to an HSA are 100% deductible as an adjustment to income (above the line), reducing adjusted gross income even for filers who take the standard deduction. — IRS Publication 969
Self-employed individuals can deduct the premiums they paid for health insurance for themselves, their spouse, and dependents as an adjustment to income. — IRS Publication 535

Key takeaways

Max out pre-tax retirement accounts first — traditional 401(k), IRA, and SEP-IRA contributions directly reduce taxable income.
Above-the-line deductions (HSA, student loan interest, SE deductions) reduce AGI even if you take the standard deduction.
Itemize only when Schedule A deductions exceed your standard deduction — most filers don't.
Self-employed workers have extra deduction opportunities: SE tax deduction, self-employed health insurance, and retirement plan contributions.
These are legal tax-code provisions — consult a tax professional to identify which apply to your specific situation.