Reducing taxable income is not about hiding money from the IRS — it is about using the deductions, exclusions, and deferrals that Congress wrote into the tax code. Every dollar you legitimately subtract from gross income is a dollar the IRS cannot tax at your marginal rate. For a taxpayer in the 24% federal bracket, a $5,000 reduction in taxable income saves roughly $1,200 in federal tax, plus possible state savings. The strategies below are legal, widely used, and available to most US filers.
Start With Pre-Tax Retirement Contributions
The single most reliable way to reduce taxable income is to contribute to an employer-sponsored retirement plan through a salary deferral. Traditional 401(k), 403(b), and governmental 457(b) contributions come out of your paycheck before federal income tax is calculated. For 2025, the employee elective deferral limit is $23,500, with an additional $7,500 catch-up contribution for those age 50 and older. If you are in the 22% bracket and max out at $23,500, you defer roughly $5,170 in federal income tax for the year.
A traditional IRA works similarly but has income-based deductibility rules if you or your spouse are covered by a workplace plan. If neither spouse is covered, the full contribution is generally deductible regardless of income. The 2025 IRA limit is $7,000, plus a $1,000 catch-up at age 50.
Use an HSA as a Triple-Tax-Advantaged Account
A health savings account (HSA) is the only account in the US tax code with three tax benefits: contributions are deductible, growth is tax-free, and qualified medical withdrawals are tax-free. To contribute, you must be enrolled in a high-deductible health plan. For 2025, the self-only contribution limit is $4,300 and the family limit is $8,550, with a $1,000 catch-up at age 55.
Many people pay current medical expenses out of pocket and let the HSA invest for the long term, saving receipts to reimburse themselves years later. That turns the HSA into a de facto retirement account for healthcare costs in retirement.
Claim Every Deduction You Are Entitled To
If you itemize on Schedule A, several deductions directly reduce taxable income:
- Mortgage interest on up to $750,000 of qualified debt for most filers.
- State and local taxes (SALT), capped at $10,000 per return.
- Charitable contributions to qualified 501(c)(3) organizations, with substantiation required for gifts of $250 or more.
- Medical expenses exceeding 7.5% of adjusted gross income.
Bunching deductions — concentrating charitable gifts and other itemized expenses into a single year — can push you over the standard deduction threshold in that year while you take the standard deduction in others. Donating appreciated securities held more than one year lets you deduct fair market value and avoid capital gains tax on the appreciation.
Reduce Business and Self-Employment Income
If you are self-employed, your taxable income is net profit, so every legitimate business expense reduces it. Common deductions include the home office deduction, mileage at the IRS standard rate, health insurance premiums, retirement plan contributions, and the qualified business income (QBI) deduction under Section 199A, which can exclude up to 20% of qualified pass-through income.
Hiring your children in a legitimate family business is another long-standing strategy: their wages are deductible to the business and typically taxed at the child's lower rate, and no Social Security or Medicare tax is owed for a child under 18 employed by a parent's sole proprietorship.
Harvest Losses and Manage Timing
Capital losses offset capital gains dollar for dollar, and up to $3,000 of excess losses can offset ordinary income each year, with the remainder carried forward. Tax-loss harvesting in a taxable brokerage account is a straightforward way to reduce taxable income without changing your long-term allocation.
Timing matters too. Deferring a year-end bonus into January, or accelerating deductible expenses into December, shifts income and deductions between tax years. If you expect a lower-income year, converting a traditional IRA to a Roth IRA in that year can lock in a lower tax rate on the conversion.
Understand What Does Not Work
The IRS is explicit that deductions require a business purpose, economic substance, or specific statutory authorization. Personal expenses are not deductible, and claiming them invites penalties and interest. Contributions to a Roth 401(k) or Roth IRA do not reduce current taxable income because they are made with after-tax dollars — the benefit is tax-free growth and withdrawals in retirement.
What to Remember
Reducing taxable income comes down to three levers: exclude income before it reaches your return, deduct expenses the code allows, and time income and deductions across tax years. Max out pre-tax retirement accounts and an HSA first, itemize or bunch deductions when it beats the standard deduction, and document every business expense. Run the numbers with a CPA or tax software before year-end, because most of these moves must be made by December 31 to affect the current tax year.
