Taxes are not fun. But legally lowering your taxable income is something every taxpayer should understand. Whether you are self-employed, a business owner or a W-2 employee, the Internal Revenue Code contains deductions that may reduce income before you even reach the standard or itemized deduction.
What Does "Above the Line" Mean?
Your adjusted gross income, or AGI, starts with your gross income and subtracts certain adjustments allowed by the tax code.
These adjustments are commonly called above-the-line deductions because they are generally available without requiring you to itemize deductions on Schedule A.
Lowering AGI can be particularly valuable because AGI and modified AGI are used in determining eligibility for numerous deductions, credits and other tax benefits.
1. Health Savings Account Contributions
For taxpayers covered by a qualifying high-deductible health plan, an HSA can be one of the most useful tax-planning accounts available.
For 2025, the general HSA contribution limit is $4,300 for self-only coverage and $8,550 for family coverage. Eligible individuals age 55 or older may generally contribute an additional $1,000.
HSA contributions may be deductible, earnings can grow without current taxation, and qualifying medical withdrawals can generally be received tax free.
2. Traditional IRA Contributions
For 2025, the general IRA contribution limit is $7,000, or $8,000 for an individual age 50 or older.
Whether a traditional IRA contribution is deductible depends on factors including income, filing status and participation in an employer retirement plan.
Even when the deduction is limited, retirement-account planning should be reviewed as part of the taxpayer's overall strategy rather than considered in isolation.
3. Self-Employed Retirement Plans
Business owners and self-employed taxpayers may have significantly larger retirement-plan opportunities through arrangements such as SEP IRAs, SIMPLE IRAs and qualified retirement plans.
A properly structured retirement plan can help a business owner simultaneously build retirement assets and reduce current taxable income.
4. Self-Employed Health Insurance
Eligible self-employed taxpayers may be able to deduct qualifying health insurance premiums for themselves, their spouse, dependents and certain children.
The deduction is subject to several restrictions, including limits based on earned income from the business and rules applying when the taxpayer is eligible for subsidized employer coverage.
5. Deductible Portion of Self-Employment Tax
Self-employed taxpayers generally pay both the employer and employee components of Social Security and Medicare taxes through the self-employment tax system.
The tax code generally allows an adjustment to income for the deductible employer-equivalent portion of self-employment tax. The calculation is made as part of Schedule SE and flows to Schedule 1.
6. Student Loan Interest
Eligible taxpayers may deduct up to $2,500 of qualified student loan interest as an adjustment to income.
For 2025, the deduction begins phasing out when modified adjusted gross income reaches the applicable statutory ranges and is eliminated at higher income levels.
Unlike many deductions, the taxpayer does not have to itemize Schedule A in order to claim qualifying student loan interest.
7. Educator Expenses
Eligible kindergarten through grade 12 teachers, instructors, counselors, principals and aides who meet the IRS requirements may deduct qualifying unreimbursed classroom expenses.
For 2025, the deduction is generally limited to $300 per eligible educator, or as much as $600 on a joint return when both spouses qualify, subject to the per-person limitation.
8. Don't Confuse AGI Deductions With Itemized Deductions
Mortgage interest, charitable contributions, certain state and local taxes and qualifying medical expenses generally belong to a different category of deductions.
These are usually considered when determining whether to claim the standard deduction or itemize deductions on Schedule A.
Above-the-line deductions reduce AGI first. That distinction can matter because AGI affects several other calculations throughout the tax return.
The objective is to coordinate income, retirement contributions, business deductions, investment activity and other tax attributes before the year is over. Waiting until the return is prepared can eliminate many planning opportunities.
Business Owners Have Additional Opportunities
For business owners, the analysis can go significantly further. Entity structure, reasonable compensation, retirement plans, equipment purchases, timing of income and expenses, accountable plans, health insurance, depreciation and tax credits can all affect the ultimate tax result.
That is why tax preparation and tax planning should be viewed as different services. Preparation reports what already happened. Planning attempts to influence the result while decisions can still be made.
The Bottom Line
A good tax strategy starts with understanding your actual income, your available adjustments and the tax rules applicable to your specific circumstances.
Instead of asking only, "What deduction am I missing?" the better question is often, "What can I do during the year to improve my overall tax position?"
Reference materials include IRS Schedule 1, Publication 17, Publication 590-A, Publication 969 and Publication 970.
Dollar limitations and eligibility rules can change annually. This article discusses tax year 2025.
Abotteen & Co. provides individual and business tax planning, tax preparation and accounting services throughout California and across the United States.