Freelancer tax checklist: what 1099 contractors should do before tax season

What are the key dates for your 2026 taxes?

1. Make your fourth-quarter estimated payment

The last 2026 estimated payment is due January 15, 2027. You can skip it only if you file your 2026 return by February 1, 2027 and pay the full balance with it.

To avoid an underpayment penalty, your withholding and estimated payments generally need to reach the smaller of 90% of your 2026 tax or 100% of your 2025 tax (110% if your 2025 adjusted gross income was over $150,000, or $75,000 if married filing separately). The quarterly estimated tax calculator shows what is left to pay, and the estimated taxes guide explains the rules.

2. Collect your 1099 forms

• Form 1099-NEC. Clients who paid you for services in the course of their business must send one when they paid you $2,000 or more during 2026. That threshold was $600 for payments made before 2026.
• Form 1099-K. Payment apps and online marketplaces must report payments for goods or services when they total over $20,000 in more than 200 transactions. They may send a form for smaller amounts.

Match each form to your own records. A payment can show up on a 1099-K and also be counted by a client, so report each dollar of income once and keep notes that explain any differences. The guide to 1099-NEC vs 1099-K covers how the two forms overlap.

Missing a form does not change what you owe. Income below the thresholds, or from a client who never sends a form, is still taxable.

3. Close your books for the year

• Total your gross receipts from invoices and bank deposits, not just from 1099s. Clear invoicing makes this easier; see freelance invoice basics.
• Categorize business expenses: software, equipment, professional fees, insurance, phone and internet business share, and so on. Keep receipts.
• Finish your mileage log and split 2026 miles into January to June and July to December, because the IRS rate changed on July 1. See the business mileage guide.
• Measure your home office and gather rent, utility and insurance totals if you use the regular method. See the home office guide.
• Total your health insurance premiums by month, noting any month you were eligible for an employer plan. See the self-employed health insurance deduction.

4. Know which forms you will file

• Schedule C reports your business income and expenses and gives you net profit. A single-member LLC with default tax treatment uses it too; see LLC vs sole proprietor.
• Schedule SE figures self-employment tax: 15.3% of 92.35% of net profit, with Social Security capped at $184,500 of combined wages and net earnings for 2026. It applies when net earnings are $400 or more. See how to calculate self-employment tax.
• Form 8995 or 8995-A figures the qualified business income deduction. Form 8995 is the simpler version when taxable income before the deduction is at or below the threshold, $201,750 single or $403,500 married filing jointly for 2026. See the QBI deduction guide.
• Schedule 1 carries the deductible half of SE tax, the self-employed health insurance deduction and retirement plan contributions.
• Form 8829 if you use the regular home office method, and Form 7206 if required for the health insurance deduction.

5. Check retirement plan deadlines

Retirement contributions can lower your 2026 income tax, but the deadlines depend on the plan. The SEP IRA vs solo 401(k) guide compares them in detail.

• SEP IRA. You can set up a SEP and make 2026 contributions as late as the due date of your 2026 return, including extensions. With an extension, that can be October 15, 2027.
• Solo 401(k). The plan generally must be set up by the last day of the year, December 31, 2026, for the contributions to be deductible for 2026. A sole proprietor with no employees can adopt a new 401(k) after year-end if it is adopted by the filing deadline without extensions, April 15, 2027. In that case, elective deferrals for 2026 must also be paid in by April 15, 2027.
• Employer contributions to an existing plan count for 2026 if made by the return due date, including extensions, and the plan treats them as made for 2026.

6. File, or extend and pay

Your 2026 federal return is due April 15, 2027. If you need more time, request an extension by that date to move the filing deadline to October 15, 2027.

An extension is only for filing. Pay any tax you owe by April 15, 2027. You can request the extension by making an online payment and marking it as an extension payment. If you are unsure of the final number, estimate it with the self-employment tax calculator and pay on the high side.

7. Don't forget your state

• Most states with an income tax require a state return and their own estimated payments.
• State deadlines often match the federal date, but not always. Check your state tax agency.
• If you worked in or for clients in another state, check whether you owe a return there too.
• An LLC may owe state annual fees or taxes even with no profit.

8. Set up next year

• Schedule your 2027 estimated payments in your calendar.
• Decide what share of each payment to set aside; see how much to set aside for taxes.
• Review your pricing with this year's real tax cost in the freelance rate calculator.

If your income jumped, you had income in several states, or you are weighing a business structure change, book time with a tax professional before the filing rush.