If you earn $85,000 in salary, you do not pay income tax on $85,000. By the time adjustments, deductions, and exclusions are applied, your taxable income is likely $55,000-65,000. Understanding what reduces that number -- and how to legally increase those reductions -- is the most practical form of tax planning available to most people.
The Path From Gross Income to Taxable Income
Gross Income minus Above-the-Line Adjustments = Adjusted Gross Income (AGI)
AGI minus Standard Deduction (or Itemized Deductions) = Taxable Income
Taxable Income x Bracket Rates = Tax Before Credits
Tax Before Credits minus Tax Credits = Tax Owed
Above-the-Line Adjustments (Reduce AGI)
These reductions happen before you even get to the standard deduction. They lower your AGI, which also affects eligibility for other deductions and credits that phase out at higher income levels.
- Traditional 401(k) contributions: Up to $23,500 in 2026 ($31,000 if age 50+). Contributed pre-tax through payroll -- your employer reports the reduced amount on your W-2.
- Traditional IRA contributions: Up to $7,000 ($8,000 if 50+), deductible if you do not have a workplace retirement plan or are under the income phase-out range.
- HSA contributions: Up to $4,300 (individual) or $8,550 (family) in 2026. Triple tax advantage -- pre-tax contribution, tax-free growth, tax-free withdrawal for medical expenses.
- Self-employed retirement plans: SEP-IRA contributions up to 25% of net self-employment income (max $70,000 in 2026). One of the most powerful deductions available to freelancers and business owners.
- Student loan interest: Up to $2,500, subject to income phase-outs.
- Alimony paid: For divorces finalized before 2019 only.
The Most Effective Strategy: Maxing Retirement Accounts
A single filer earning $85,000 who maxes their 401(k) at $23,500 reduces their AGI to $61,500. After the $15,000 standard deduction, taxable income is $46,500 -- solidly in the 12% bracket rather than the 22% bracket. The tax savings: roughly $2,585 in federal income tax, plus the investment growing tax-deferred for decades.
Adding an HSA contribution of $4,300 reduces taxable income further to $42,200 -- saving another $946 in federal tax. Combined with the long-term value of tax-free medical spending, this is one of the highest-ROI financial moves available.
Tax Credits vs. Deductions: The Difference
Deductions reduce your taxable income. Credits reduce your tax owed dollar for dollar -- making them more valuable. A $1,000 deduction saves you $220 if you are in the 22% bracket. A $1,000 tax credit saves you $1,000 regardless of your bracket.
Key credits for 2026: Child Tax Credit ($2,000 per qualifying child, partially refundable), Earned Income Tax Credit (up to $7,830 for families with three or more children), Child and Dependent Care Credit, Lifetime Learning Credit for education expenses.
Common Above-the-Line Deductions People Miss
- Educator expenses: teachers can deduct up to $300 of out-of-pocket classroom supplies
- Moving expenses for active-duty military
- Health insurance premiums for self-employed individuals (deductible as an adjustment to income)
- Half of self-employment tax (the employer-equivalent portion)
Use our Income Tax Calculator to see how different contribution levels affect your tax bill, and our Tax Refund Calculator to estimate your refund or balance due.
Strategies to Legally Reduce Your Taxable Income
Understanding what taxable income is — your gross income minus all applicable deductions and adjustments — is just the start. The real value comes from knowing which levers you can pull to reduce it. Every dollar of taxable income you eliminate saves you your marginal tax rate in federal income tax plus your state rate. The strategies below are all legitimate and built into the tax code.
Above-the-Line Deductions (Reduce AGI Directly)
These deductions reduce your Adjusted Gross Income before you even get to the standard vs. itemized decision. Lower AGI also helps you qualify for more credits and avoids income-based phase-outs.
- Traditional 401(k) and 403(b) contributions: Up to $23,500 in 2025 ($31,000 if 50 or older). Pre-tax contributions reduce your taxable income dollar-for-dollar.
- Traditional IRA contributions: Up to $7,000 ($8,000 if 50+) — deductible if you don't have a workplace plan or if income falls below certain thresholds.
- HSA contributions: Up to $4,300 for self-only or $8,550 for family coverage in 2025. HSAs are triple tax-advantaged: deductible, grows tax-free, and qualified withdrawals are tax-free.
- SEP-IRA and Solo 401(k) contributions: For self-employed individuals, these allow contributions up to 25% of net self-employment income, dramatically reducing AGI.
- Student loan interest: Up to $2,500 per year if your income is below the phase-out threshold.
- Self-employed health insurance premiums: 100% deductible for self-employed individuals not eligible for employer-sponsored coverage through a spouse.
Capital Gains Management
Tax-loss harvesting — selling assets at a loss to offset gains — is one of the most effective tools for investors with taxable accounts. You can offset unlimited gains with losses, and up to $3,000 of net losses per year can offset ordinary income. Losses carry forward indefinitely to future years.
Timing Matters More Than You Think
If you expect a lower-income year ahead, deferring income (delaying invoices if self-employed, pushing a bonus to January) into that year can result in lower rates. Conversely, accelerating deductions into a high-income year maximizes their value. Year-end tax planning is most effective when done in October and November — not December 31.
Use our income tax calculator to see how different deduction scenarios affect your estimated tax bill, and our 2026 tax bracket guide to understand where your income falls in the rate schedule.