Last-Minute Tax Deductions You Might Be Missing

April 15 is ten days away. If you are finishing your 2025 return right now (or deciding how much to pay with your Q1 2026 estimated payment), this is the moment to make sure you are not leaving deductions on the table. Self-employed workers and freelancers have access to several valuable deductions that W-2 employees do not, but the ones in this article are the most commonly missed. Each one directly reduces both your income tax and your self-employment tax, so even a small overlooked deduction can cost you more than you would expect.

The Self-Employment Tax Deduction

This is the deduction that confuses people the most, partly because it is built into the tax return and does not require you to do anything extra. When you file Schedule SE, you calculate your self-employment tax (15.3% on net earnings up to the Social Security wage base of $176,100 for 2025, then 2.9% above that). The IRS then lets you deduct half of that SE tax as an above-the-line adjustment on Schedule 1 of your 1040.

Why does this matter right now? Because if you have been estimating your quarterly payments without accounting for this deduction, you may have been overpaying. For example, if your net self-employment income is $80,000, your SE tax is roughly $11,304. Half of that ($5,652) is deductible, which reduces your adjusted gross income and, therefore, your income tax. At a 22% marginal rate, that is about $1,243 in additional savings you may not have included in your quarterly estimates.

You do not need to do anything special to claim this deduction. It is calculated automatically when you complete Schedule SE. But understanding it helps you project your actual tax liability more accurately, and it is worth checking whether your estimated payments for 2026 account for it.

Self-Employed Health Insurance Premiums

If you pay for your own health insurance and you are not eligible for coverage through a spouse's employer plan, you can deduct 100% of your premiums as an above-the-line deduction. This includes medical, dental, and vision insurance premiums for you, your spouse, and your dependents. It also includes premiums for long-term care insurance, subject to age-based limits.

This deduction is taken on Schedule 1, not on Schedule C. That means it reduces your adjusted gross income but does not reduce your net self-employment income for SE tax purposes. Still, the savings are significant. A freelancer paying $600 per month for a marketplace plan ($7,200 per year) who is in the 22% bracket saves roughly $1,584 in income tax from this single deduction.

If you purchased coverage through the ACA marketplace and received a premium tax credit (the subsidy), you can only deduct the portion of the premium you actually paid out of pocket, not the subsidized amount. Make sure you have your Form 1095-A from the marketplace before filing.

The Home Office Deduction

Many freelancers skip this deduction because they think it triggers audits or requires complicated calculations. Neither is true. If you use a dedicated space in your home regularly and exclusively for business, you qualify. The space does not need to be a separate room: a desk in the corner of a bedroom counts, as long as it is used only for work.

The simplified method is the easiest path: $5 per square foot of your home office, up to a maximum of 300 square feet ($1,500). You do not need to calculate your mortgage or rent, utilities, or insurance. You just measure the space and multiply.

The regular method is more work but can yield a larger deduction if your home expenses are high. You calculate the percentage of your home used for business (based on square footage) and apply that percentage to actual expenses: rent or mortgage interest, utilities, insurance, repairs, and depreciation. For renters paying $2,000 per month with a 150 sq ft office in a 1,000 sq ft apartment (15%), that is $3,600 per year in deductible rent alone, plus a share of utilities.

Unlike the health insurance deduction, the home office deduction is taken on Schedule C, which means it reduces your net self-employment income. That lowers both your income tax and your SE tax (15.3%), making it especially valuable for self-employed filers.

Professional Subscriptions and Software

If you pay for tools that you use for your business, those costs are deductible. This includes software subscriptions (Adobe Creative Cloud, QuickBooks, project management tools, cloud storage), professional memberships (industry associations, coworking spaces), trade publications, and continuing education courses that maintain or improve skills in your current line of work.

These are easy to miss at tax time because they often come as small monthly charges that do not feel like "business expenses." But they add up. A freelancer paying $55 per month for Adobe, $30 for accounting software, $15 for cloud storage, and $200 per year for a professional membership is looking at $1,400 in deductible expenses that might otherwise go unclaimed.

Review your bank and credit card statements for recurring charges. If a subscription is used partly for personal and partly for business purposes, deduct only the business-use percentage.

Business Insurance

If you carry professional liability insurance (errors and omissions), general liability insurance, or any other business-specific policy, the premiums are fully deductible on Schedule C. Many freelancers, consultants, and gig workers carry at least one of these policies but forget to include them at tax time. Check your email or insurance account for annual premium statements.

Other Commonly Missed Deductions

Internet and phone (business portion). If you use your personal phone and internet connection for work, the business-use percentage of those bills is deductible. A reasonable estimate (such as 50% for a freelancer who works from home full-time) is acceptable as long as you can support it.

Mileage for business travel. If you drive to meet clients, pick up supplies, or attend industry events, those miles are deductible at the IRS standard rate (70 cents per mile for 2025, estimated). Commuting from home to a regular office does not count, but if your home is your principal place of business, trips from home to client sites are business miles.

Retirement contributions. If you have a Solo 401(k), the employee contribution deadline for 2025 was December 31, but employer contributions (and SEP-IRA contributions) can be made until your filing deadline, including extensions. If you filed for an extension, you still have time to make a SEP-IRA contribution for 2025 and reduce your taxable income.

Work With a Tax Professional

This article covers the deductions that freelancers most commonly overlook, but it is not a complete list. Every situation is different, and a CPA or enrolled agent who works with self-employed clients can review your specific circumstances, catch deductions you may have missed, and make sure your return is accurate. Use the calculator to get a baseline estimate of your tax liability, and bring those numbers to a professional if you want a fully personalized review before April 15.