The tax code is written to reward specific behaviors: saving for retirement, investing in health, owning a business. Understanding which behaviors qualify for deductions lets you pay less — legally.
1. Max Out Your 401(k) or 403(b)
$23,500 of pre-tax 401(k) contributions in 2025 reduces your taxable income dollar-for-dollar. In the 22% bracket, maxing out saves $5,170 in federal taxes. In the 24% bracket: $5,640 saved. This is the single biggest lever for most W-2 employees.
2. Contribute to an HSA
HSA contributions ($4,300 individual, $8,550 family in 2025) reduce taxable income and can be invested for tax-free growth. Triple tax advantage: deductible going in, tax-free growth, tax-free withdrawal for medical expenses. If you have an HDHP, this is mandatory.
More Strategies
- •Flexible Spending Account (FSA): Up to $3,300 pre-tax for medical or dependent care expenses
- •Deductible IRA: Up to $7,000 if income qualifies — check phase-out limits
- •Self-employment deductions: Half of SE tax, health insurance premiums, home office, retirement plan contributions (SEP-IRA: up to 25% of net earnings, max $69,000)
- •Rental property depreciation: Reduces taxable rental income significantly — consult a CPA
- •Harvest tax losses: Sell losing investments to offset capital gains — up to $3,000/year against ordinary income
- •Bunching charitable deductions: Combine two years of donations in one year to exceed the standard deduction threshold, then take standard deduction next year
- •Mortgage interest deduction: Deductible on loans up to $750,000 if you itemize
Run a "tax projection" in October. Most tax reduction strategies must be in place by December 31. Knowing your projected income with two months left gives you time to max retirement accounts, harvest losses, or accelerate deductions.
The most powerful tax reduction is also the most boring: maximize tax-advantaged accounts (401k, HSA, IRA) every year. These alone can shelter $35,000+ of income annually — more than most deductions combined.