What you get
A clean payment-planning view focused on action, not accounting overhead.
Public tool · US freelancers · educational guidance
Stop guessing your next quarterly tax payment.
Check your safe-harbor coverage, next payment gap, and underpayment risk in minutes — without opening a full tax software stack.
- Safe-harbor target from prior-year total tax
- Coverage from withholding + payments already sent
- Next IRS deadline and catch-up baseline
- Rough self-employment tax preview
Built for US freelancers, 1099 contractors, and solo business owners. Educational guidance only — not tax or legal advice.
What this solves
“Am I behind, and what should I send next?”
Best for
1099 workers, consultants, creators, solo operators
Not for
Filing returns, state tax prep, or full bookkeeping
Why this exists
IRS estimated-tax and underpayment rules are real, but most people need a practical planning baseline before the next deadline — not more scattered reading.
Safe-harbor target
Based on prior-year total tax and the higher-income toggle.
Coverage check
Estimated payments already made plus expected withholding.
Catch-up baseline
See your gap, remaining installments, and the next due date.
Calculator
Run your quarterly check
Use federal numbers only. Net self-employment income means profit after business expenses, not gross revenue.
Results
Your planning baseline
Designed to answer the urgent question between deadlines: are you roughly on track, or do you need to catch up now?
Enter your numbers to see safe-harbor coverage, payment gap, remaining installments, and a rough self-employment tax preview.
Status
On track
Next IRS deadline
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Assumptions and limits
- This tool uses a simplified safe-harbor baseline based on prior-year total tax.
- Withholding is treated as part of annual coverage for planning.
- It does not calculate your exact final tax bill or guarantee penalty avoidance.
- If your income varies heavily, annualized-income methods or professional review may be more appropriate.
How it works
Built for one urgent decision
QuarterlyTaxCheck is not trying to replace filing software. It helps you turn prior-year tax, current payments, withholding, and expected income into a practical next step before the next due date.
1. Enter your baseline
Use prior-year total tax and the high-AGI toggle to estimate your simplified safe-harbor target.
2. Count current coverage
Add estimated payments already sent and expected withholding to see what is already covering that target.
3. Plan the next move
See your gap, remaining installments, the next deadline, and a rough self-employment tax preview so you can catch up early if needed.