About Stivenza
Stivenzais a free, no-login US paycheck & take-home-pay calculator. Our goal is simple: give anyone an instant, accurate answer to "how much do I actually keep?" — with full transparency about how the number is calculated.
Who runs it
Stivenza is built and operated by ColsonSuperApps LLC (Wyoming, USA), a software company founded by Colson (Founder, ColsonSuperApps LLC). We build focused, privacy-first utility tools — Stivenza is our US payroll/tax calculator.
Why you can trust the numbers
Accuracy is the whole point. Every figure comes from authoritative published sources for the current 2026 tax year — the IRS, the Social Security Administration, and each state's Department of Revenue — never guessed or estimated from memory. The tax engine is independently unit-tested against pinned reference values before any page ships. See exactly how each number is produced on our methodology page and our editorial & accuracy policy.
Privacy first
All tax math runs entirely in your browser. We never send your pay or personal details to a server — there's nothing to leak, and no account required. The free tools work fully anonymously.
What we offer
- A US paycheck calculator (federal, state, Social Security, Medicare).
- Calculators by state, by salary, and by hourly wage; plus bonus, overtime, gross-up & self-employment tools.
- UK, Canada & Australia take-home calculators.
- Plain-English guides on pay and taxes.
Not financial advice
Stivenza provides estimates for educational purposes — not tax, legal, or financial advice. Your actual paycheck and tax return may differ; consult a professional for your specific situation.
Contact
Questions, corrections, or feedback? colsonsuperapps@gmail.com. We read everything and fix errors quickly. Last updated June 1, 2026.