How the 1099 Estimate Is Calculated
Taxes on 1099 income are based on profit, not on the gross amount a platform paid you. The quarterly estimator follows these steps, in this order:
- Net profit. Gross income for the quarter minus the standard mileage deduction for the business miles you enter.
- Annual projection. That quarterly profit is projected over four equal quarters, because tax brackets and the standard deduction are annual figures.
- Self-employment tax. 92.35% of projected profit is taxed at 15.3%: 12.4% for Social Security plus 2.9% for Medicare.
- Federal income tax. Projected profit minus half of the self-employment tax, the standard deduction ($16,100 single, $32,200 married filing jointly), and the qualified business income deduction is run through the 2026 federal brackets.
- Quarterly amount. The annual total is divided by four.
This assumes every quarter looks like the one you entered. If your income changes during the year, the quarterly estimated tax planner works out a separate installment for each due date.
Worked Example: One Quarter of 1099 Income
A single filer with no other income earns $15,000 on a 1099 platform between July and September 2026 and logs 7,000 business miles. Entering those numbers in the calculator above returns:
| Gross 1099 income for the quarter | $15,000 |
|---|---|
| Standard mileage deduction7,000 mi × $0.76 (July–December 2026 rate) | −$5,320 |
| Net profit | $9,680 |
| Self-employment tax | $1,368 |
| Federal income tax | $415 |
| Estimated federal payment for the quarter11.9% of gross income | $1,783 |
Federal estimate only. It leaves out state and local tax, the qualified tips deduction, credits, other income or withholding from another job, and payments you already made. The Social Security wage base and Additional Medicare Tax, which only affect high profits, are not modeled.
What the Mileage Log Is Worth
Run the same quarter again with zero business miles and the estimate rises from $1,783 to $3,009. The 7,000 logged miles are worth about $1,226 in federal tax for that one quarter, because the deduction lowers the profit that both self-employment tax and income tax are calculated on.
That saving depends on records. The mileage deduction needs a log kept at the time of the trips, with the date, the miles, and the business purpose. See what records the IRS requires from drivers and the mileage deduction calculator to estimate the deduction on its own.
Common 1099 Deductions to Review
- Business mileage using the applicable 2026 IRS rate for each half of the year
- Platform service fees and commissions that reduce contractor take-home pay
- Business-use share of phone service, mounts, supplies, and safety equipment
- Ordinary delivery or rideshare expenses that belong on Schedule C
- Half of self-employment tax as an above-the-line adjustment on Form 1040
The calculator models the mileage deduction only. Subtract your other business expenses from the income you enter to get closer to your real Schedule C profit. For drivers, the full driver tax deductions checklist covers each one, plus which deductions also lower self-employment tax.
2026 Estimated Tax Due Dates
Estimated payments for 2026 are due April 15, June 15, and September 15, 2026, and January 15, 2027. The guide to quarterly tax payments explains who has to pay, which months each date covers, and how to pay.
Never miss a payment. Add the next 4 due dates (Jan 15, 2027 – Sep 15, 2027) to Google Calendar, Apple Calendar, or Outlook, with a reminder 3 days before each one.
Add to calendar1099 Tax FAQs
What is the self-employment tax rate?
Generally, 92.35% of net self-employment profit is subject to tax. For 2026, the Social Security portion is 12.4% up to $184,500 of combined covered earnings, and Medicare is 2.9% without that cap. Additional Medicare tax may apply above the filing-status threshold.
Can I deduct half of self-employment tax?
Yes. You can deduct 50% of your self-employment tax from your gross income when calculating adjusted gross income.
What is a Schedule C?
Schedule C is the IRS form independent contractors use to report business income and deduct business expenses. You file it with Form 1040.
Is 1099 tax based on gross income or profit?
Profit. Federal income tax and self-employment tax are based on Schedule C net profit, which is gross business income minus business expenses such as mileage, platform fees, and the business share of your phone plan.
Tax Information Disclaimer
The 1099 tax calculator and this page are general education, not tax, legal, or accounting advice. Tax rules change and depend on your circumstances; consult a qualified tax professional before filing. See our terms of use.