Free Tax Calculator Widget for Your Website (2025

Pick a calculator

Copy the code

Paste it where the calculator should appear. In WordPress, use a Custom HTML block. In Squarespace or Wix, use an Embed or Code block.

<iframe src="https://overtimekept.com/embed/overtime/" title="No tax on overtime calculator" style="width:100%;max-width:760px;height:1150px;border:0" loading="lazy" allow="clipboard-write; web-share"></iframe>
<p style="font:14px/1.4 sans-serif;margin:6px 0 0"><a href="https://overtimekept.com/">No tax on overtime calculator</a> by Overtime Kept</p>
<script>addEventListener("message",function(e){if(e.origin!=="https://overtimekept.com"||!e.data||!e.data.otkHeight)return;document.querySelectorAll('iframe[src^="https://overtimekept.com/embed/"]').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.otkHeight+"px"})});</script>

The small script lets the calculator grow and shrink to fit. If your site strips scripts, the calculator still works at a fixed height.

Preview

Terms, in short

Free for any website, including commercial ones.
Keep the credit link under the calculator.
We update the tax numbers inside the widget ourselves, so your copy stays current with no work on your side.
Results are estimates for general information, not tax advice. The full terms of use apply.

What the calculators do

Each one estimates a 2025 or 2026 federal deduction and the income tax it saves, using the IRS brackets and standard deduction for that year. The math follows the Internal Revenue Code and IRS guidance. How we calculate lists every number and its source.

Questions or a calculator you'd like to see? Email hello@overtimekept.com.