Try them — these are the actual embeds
Both calculators below are loaded exactly the way yours would be — same snippet, same on/off check. Type in them; they run in your browser, just like on the free calculator pages.
Self-employment tax calculator
No tax on tips calculator
The demo key is registered to renhollis.com only. That's the same check your calculators will pass on your website — and fail on anyone else's.
The four calculators
| Calculator | What it answers |
|---|---|
| No tax on tips | “What is the new tips deduction worth to me?” — with the caps, the income limits where it phases out, and the new tips line on the W-2 (Box 12, Code TP) |
| No tax on overtime | “What is the new overtime deduction worth?” — only the extra “half” of time-and-a-half pay counts, and it handles the new overtime line on the W-2 (Box 12, Code TT) |
| Self-employment tax | “What do I owe on my business profit?” — the full 15.3% broken down, the half you can deduct, and the four payment dates for the year. Covers 2025, 2026, and the new 2027 Social Security limit |
| Paycheck | “What's my take-home pay?” — after federal tax and Social Security/Medicare are taken out. State tax is included for Florida and the eight states with no wage tax, and labeled honestly where it isn't |
Every calculator shows its math and names its sources — your clients get the same openness in the embed, and the same honest labels about what's covered (for example, the paycheck calculator says plainly which states it includes instead of guessing at the rest). The full source list is at the bottom of this page.
How it works
- Subscribe to Standard or White-label below (checkout is on Gumroad). Your email receipt carries your license key — the code that turns your calculators on.
- Activate with the form at the bottom of this page: your key, your website address, firm name, and brand color (plus a link to your logo on White-label). A real person on our side switches you on, within one business day — you'll get an email when it's live.
- Paste two lines of code where you want the calculator:
<div class="rh-calc" data-calculator="self-employment-tax-calculator" data-license="RH-YOUR-KEY"></div> <script async src="https://renhollis.com/embed/embed.js"></script>
That's the whole install. The calculator adjusts itself to fit the page and the reader's screen, phones included. One subscription covers all four calculators on one website — place the snippet as many times as you like, just change the calculator name in the first line for each one.
We keep the tax figures current — the part nobody wants to do themselves
Tax widgets go stale: the Social Security limit moves, tax brackets move, and the tips and overtime deductions are brand-new law with fresh IRS guidance still arriving. These calculators live on our server, so when a new number is published, we update it once and every copy updates with it — the 2027 Social Security earnings limit ($192,300) is already in. Nothing to reinstall, no updates for you to run, no out-of-date numbers embarrassing you in front of a client.
Standard — $19/mo
All four calculators on one website. Your firm name and brand color at the top of each calculator, plus a small “Powered by Ren Hollis” line underneath. We keep every tax figure current; updates are included.
Sold as a subscription on Gumroad, with your license key delivered in the receipt. The button above goes to the live checkout.
White-label — $29/mo
Everything in Standard, with your logo at the top and no credit line — the calculators look entirely like your own firm's tools.
Sold as a subscription on Gumroad, with your license key delivered in the receipt. The button above goes to the live checkout.
Frequently asked questions
How do I install a calculator on my site?
Paste the two lines above where you want the calculator to appear. It loads in a frame that resizes itself, and it works on WordPress, Wix, Squarespace, and plain HTML pages, at any width, phones included. If you can embed a YouTube video, you can install this.
Who keeps the tax figures current?
We do. The Social Security earnings limit, tax brackets, and the new tips and overtime rules are updated in one place when the IRS or Social Security publishes them — your calculators pick up the update on their own, with nothing to reinstall.
Are the calculators tax advice?
No. They are estimators that show their math and cite their IRS and Social Security sources, and they carry the same disclaimer as the calculators on renhollis.com: estimator only, not tax advice. Your firm's professional judgment stays yours.
How does the on/off check work?
When a page with the snippet loads, it asks our server whether the license key is switched on for that website. If it is, your name and colors are applied and the calculator loads. If it isn't — the code was copied to another site, or a subscription has lapsed — that spot shows a short “not activated” note instead of the calculator. One subscription covers one website; extra websites need extra subscriptions.
What happens if I cancel?
Your calculators stop switching on at the end of the paid period and show the “not activated” note, so you can remove the snippet on your own schedule. No lock-in, no cancellation fee.
Can I get more calculators?
The four tax calculators are the catalog today. Calculators for book-cover spine width and author royalties (for sites aimed at authors and publishers) and a 1099 calculator for freelancers are next if demand shows up — tell us in the activation form if you'd take one.
Activate your embed
Bought a subscription? Send this form and we'll register your website — a real person on our side switches you on within one business day, and we'll email you when it's live.
Sources & scope
- Internal Revenue Code §224 (tips) and §225 (overtime), as enacted for tax years 2025–2028; IRS guidance and the 2026 Form W-2 instructions (Box 12 Codes TP/TT, Box 14b).
- Internal Revenue Code §§1401–1402 and Schedule SE for the self-employment calculator; SSA 2026 and 2027 COLA Fact Sheets (wage bases $184,500 and $192,300).
- IRS Publication 15-T for paycheck withholding. State scope is labeled on the calculator itself; nothing is estimated for a state whose schedule hasn't been verified.
Last updated October 23, 2026. Estimator only — not tax advice. The calculators run entirely in the visitor's browser; nothing a visitor types into an embed is sent anywhere.
Just want the free calculators?
All four calculators are free to use on this site, with their math and sources shown — that's the openness the embeds inherit.