Self-Employed Quarterly Tax Calculator

Enter your self-employment income, state, and filing status to estimate what to send for the next quarterly payment.

Tax year 2026 Last updated 2026-06-11

Estimate inputs

Start with income, expenses, mileage, state, and filing status. Add W-2, withholding, spouse, and safe harbor details when needed.

Tax year Filing status State Self-employment income Other business expenses Business miles

Mileage uses the business standard mileage rate from the tax-year rate table. Do not also include the same vehicle costs in other expenses.

Add details

W-2 income Federal tax withheld Other ordinary income Estimated payments made Prior-year total tax Dependents Itemized deduction amount

Prior-year AGI over $150K Age 65+ Include simplified QBI

Deduction method Standard Itemized

Inputs stay in your browser. This estimate does not account for every credit, local tax, retirement plan, or state-specific rule.

This quarter $0 Due -- (0 payment windows left)

Annual estimate$0

Safe harbor target$0

To avoid penalties, pay at least $0 total this year through withholding and estimated payments.

Effective tax rate$0

$1,000 expense impact$0

Tax split

$0 federal

Federal income: $0
Self-employment: $0
State estimate: $0

Math checkpoint

Net self-employment: $0
Mileage expense: $0
Total business expenses: $0
Taxable income: $0
Covered already: $0

State note appears here.

New to quarterly tax estimates?

Read the step-by-step walkthrough before entering numbers, or use it to understand the result after the calculator updates.

How to use the calculator

How the estimate works

The calculator follows the same broad order as the IRS estimated tax worksheet: net self-employment income, SE tax, half-SE deduction, taxable income, income tax, credits, safe harbor, and remaining payment windows.

Net the business

Gross 1099 income minus ordinary business expenses gives the self-employment base.

Apply SE tax

Net earnings are multiplied by 92.35%, then Social Security and Medicare rates are applied.

Stack income tax

W-2, spouse, and other income help determine the progressive bracket estimate.

Split payments

Withholding and prior payments reduce the balance, then the rest is split over remaining due dates.

IRS sources used

Rates are stored in /data/rates/2026.json with source URLs and retrieval date so annual updates are a data edit.

Federal brackets, standard deductions, and selected indexed items are based on IRS tax year 2026 inflation adjustments and IRS Publication 505 for 2026 as retrieved on 2026-06-10. The IRS news release says news items may not be updated after release; verify against the latest IRS forms, instructions, and publications before production launch or annual updates. The 2026 business mileage rate is marked provisional until an IRS 2026 standard mileage notice or updated IRS mileage table is added.

IRS Publication 505 (2026) for estimated tax worksheet, due dates, tax schedules, and SE tax worksheet.
IRS 2026 inflation adjustments for standard deductions and bracket thresholds.
SSA 2026 COLA fact sheet for self-employed rate and Social Security wage base.
IRS standard mileage rates for mileage deduction context. The 2026 business mileage value remains marked provisional in the rate table until an IRS 2026 notice/table is added.
IRS OBBBA fact sheet for tips, overtime, senior deduction, and related 2025-2028 deduction context.