Embed the RSU Shortfall calculator on your site
Drop the calculator on your CPA blog, finance newsletter, or financial-advisor site. One iframe tag, no JavaScript required on the host page. Visitors fill in their numbers, see the shortfall, and click through to mathstub for the full breakdown.
Light theme
For sites with white or light backgrounds.
<iframe src="https://mathstub.com/embed/rsu-shortfall?theme=light"
width="400" height="500" frameborder="0"
title="RSU Tax Withholding Shortfall Calculator"
loading="lazy"></iframe>Dark theme
For sites with dark or slate backgrounds.
<iframe src="https://mathstub.com/embed/rsu-shortfall?theme=dark"
width="400" height="500" frameborder="0"
title="RSU Tax Withholding Shortfall Calculator"
loading="lazy"></iframe>FAQ
- Is the embed free?
- Yes. Attribution required (the “Powered by mathstub.com” link in the widget). No commercial restrictions otherwise.
- Does the host page need any JavaScript?
- No. The widget is a single iframe — the calculator runs inside it. Your page is unaffected.
- Do you track visitors on the embed?
- The math runs entirely in the visitor’s browser. No third-party analytics on the widget itself. The “Run full breakdown” link goes to mathstub.com where our standard analytics apply.
- Can I customize the styling?
- Light / dark theme via
?theme=lightor?theme=dark. For deeper customization (brand color, fonts), email [email protected].
