What's inside
- Enter your estimated annual self-employment income and a few other numbers — everything else is a live formula.
- Self-employment tax (Social Security + Medicare + Additional Medicare Tax over $200k), calculated with the real two-bracket rule.
- A simplified progressive federal income tax estimate (single filer, 2025 IRS bracket thresholds, editable so you can update them each year).
- The IRS safe-harbor check (90% of this year vs. 100%/110% of last year) so you know the minimum you must pay to avoid a penalty.
- Your 4 real 1040-ES due dates for the 2026 tax year, with the amount due for each.
Format: .xlsx, opens in Excel, Google Sheets or LibreOffice. Educational estimate tool, not tax, legal or financial advice — verify final figures with a CPA or the IRS.
How it works
- Pay $12 below. No account, no signup.
- You get an instant download link on the confirmation page: the .xlsx file, ready to edit.
- Open it, fill in the input cells (net SE income, other income, prior-year tax if you have it), and your 4 quarterly payments appear.
$12 one-time
Who this is for
US-based freelancers, 1099 contractors and solo consultants who file a Schedule C and pay quarterly estimated tax. Built for single filers; if your situation is more complex (multiple income types, married filing jointly, state estimated tax), use this as a starting point and confirm with a CPA.