1099 taxes in 2026
A 1099 reports payments. Your federal tax calculation usually starts with net business profit, not the form's gross number.
1. Work out net profit
Add business income, then subtract ordinary business expenses you can substantiate. The result generally flows through Schedule C and is the starting point for income tax and self-employment tax.
2. Estimate self-employment tax
The regular 2026 method uses 92.35% of net profit as net earnings. Medicare is 2.9% of those earnings. Social Security is 12.4%, but only until combined W-2 wages and self-employment earnings reach the 2026 wage base. Use the self-employment tax calculator for the arithmetic.
3. Estimate income tax
Business profit also affects federal income tax. The deduction for half of regular self-employment tax lowers adjusted gross income, but it does not lower self-employment tax itself. QBI, retirement, health insurance, credits and itemized deductions can change the final return.
4. Plan payments
Tax is pay-as-you-go. You can make estimated payments or, if you also have wages, ask an employer to withhold more. The quarterly calculator compares the current-year and prior-year safe-harbor amounts.
5. Keep records
Keep invoices, 1099 forms, receipts, mileage or vehicle records, bank records and proof of estimated payments. Separate business and personal activity where practical. Good records support the profit number you enter and make filing easier.
Know the boundary
These calculators are planning tools, not filing software or individualized advice. Multiple businesses, partnerships, S corporations, spouses with separate self-employment income, credits, QBI limits and state returns need more complete treatment.
Sources
- IRS Form 1040-ES (2026) — 92.35% net-earnings factor, 2.9% Medicare and 12.4% Social Security calculation, half-tax deduction, tax schedules, safe-harbor rules and payment dates
- IRS — Self-employment tax — who pays SE tax, Additional Medicare Tax filing-status thresholds and the employer-equivalent deduction
- IRS — About Schedule SE — Schedule SE is used to figure tax due on net earnings from self-employment