Free US tax and bookkeeping tools
Free calculators and checkers for US small businesses, freelancers, e-commerce sellers and foreign founders. There's no login. Everything runs in your browser. Each result explains the rule behind it and cites the IRS or state source.
All free tools
Form 5472 Checker
Find out if your foreign-owned US LLC must file Form 5472, which years are at risk and the maximum penalty exposure.
Self-employedQuarterly Estimated Tax Calculator
Estimate your 2026 quarterly payments and compare them with the safe-harbor amount that avoids an underpayment penalty.
Self-employedS-Corp Savings Calculator
An honest look at whether an S-corp election saves you money after payroll costs, state taxes and extra filings.
Businesses that pay contractors1099 Filing Checker
Check whether you must file a 1099-NEC or 1099-MISC under the new $2,000 rule for 2026 payments, plus your state rules.
Workers & employersTips & Overtime Deduction Calculator
Estimate your "no tax on tips" and overtime deductions after the caps and income phase-outs.
E-commerceSales Tax Nexus Checker
See which states you have (or are close to) sales tax nexus in from your sales, transactions and inventory locations.
IRS noticesIRS Notice Decoder
Enter the code on your IRS notice to see what it means, your response deadline and what to do next.
BookkeepingCatch-up Bookkeeping Cost Estimator
Behind on your books? Get an instant price range and timeline to get caught up. No judgment.
ComplianceBOI Reporting Checker
Do you still need to file a Beneficial Ownership Information report with FinCEN? Check in 30 seconds.
Individuals2026 Federal Income Tax Calculator
Estimate your 2026 federal income tax, refund or balance due, and your marginal and effective rates.
PlanningInvestment Growth & ROI Calculator
Project how an investment grows with regular contributions, and see your total return.
Free downloads and reference pages
How accurate are these tools?
Every tax figure these tools use (rates, thresholds, caps, due dates and penalties) is stored in one data file. Each figure carries its official source link and the date it was last checked. The calculators read from that file, so they never rely on a number typed into the code. The worked examples on each page come from running the same code.
Are my answers stored?
No. The calculations run in your browser. Your answers are only sent to us if you choose to have your results emailed to you.
Disclaimer: This tool provides general estimates for educational purposes and is not tax, legal or accounting advice. Results depend on facts not captured here. Consult a qualified professional before acting.
