Estimated Tax Safe Harbor Calculator (2026)

Your numbers

2026 estimated tax due dates

Source: IRS Publication 505 and Form 1040-ES. Pay at IRS.gov/payments (IRS Direct Pay or EFTPS).

Track it all year instead of guessing

The Freelancer Income & Quarterly Tax Tracker logs invoices, expenses and deductible percentages, and keeps a running quarterly estimate so the January 15 payment isn't a surprise. Excel and Google Sheets, instant download.

Questions

What is the estimated tax safe harbor?

The IRS generally won't charge an underpayment penalty if your withholding and timely estimated payments total at least the smaller of 90% of this year's tax or 100% of last year's tax. If last year's AGI was over $150,000 ($75,000 if married filing separately), the prior-year figure is 110%.

When is the Q4 2026 estimated tax payment due?

January 15, 2027. It covers income earned September 1 through December 31, 2026.

Do I have to pay estimated tax if I owe less than $1,000?

Generally no. You usually don't owe the penalty if you'll owe less than $1,000 after subtracting withholding and refundable credits, or if you had no tax liability for a full 12-month prior year.

Is this tax advice?

No. It's a free planning calculator based on the general rules in IRS Publication 505. Special cases (farmers, fishers, uneven income, a short prior year) can differ, so check with a tax professional.