Embed the net proceeds after tax calculator on your site
One line of code. Federal, 3.8% NIIT and state tax, dated 2026 data, light and dark themes.
By Hans Goldstein, Enrolled Agent, admitted to practice before the IRS · Data as of
Put a "what do I keep after tax" calculator on your site with one line of code. Your visitors enter a sale price, basis, state and filing status, and see federal tax, the 3.8% NIIT, state tax and what they keep. On a $3,000,000 business sale with zero basis a single seller keeps $2,331,512 in Texas and $1,962,327 in California.
Who it is for
- Business brokers and real estate agents: sellers see their after-tax number on your listings page before they ask you about price.
- CPAs, enrolled agents and planners: a client-facing page that answers the first question every seller asks, without a spreadsheet.
- Journalists, bloggers and associations: a live, dated 50-state tool next to the story.
Preview and options
Copy and paste
One line. Put it where you want the calculator to appear.
If your site builder blocks scripts, use the plain iframe instead.
| Option | Values | Default |
|---|---|---|
data-theme | light, dark, auto | auto |
data-accent | six-digit hex, no # | Big Sale Tax navy |
data-state | two-letter state code | CA |
data-price, data-basis | whole dollars | 3,000,000 and 0 |
data-status | S (single) or J (married filing jointly) | S |
data-lead | 1 to show the optional email box | off |
data-width, data-height | for example 600px, 640 | 720px, 560 (resizes itself) |
What your visitors see
The full result, ungated: no email wall, no sign-up. Under the result is a "Get your full report" link to the full calculator on bigsaletax.com, and a plain "Calculator by Big Sale Tax" line. The attribution is part of the widget and cannot be switched off. It is a nofollow link, which is how Google asks widget links to be marked.
How the numbers stay current
The widget reads data.json, which carries the as-of date and the 50-state table behind the calculator, and prints that date under the result. Federal figures are IRS Rev. Proc. 2025-32 for 2026. State rules are the Exit Tax Map, each tied to the state's own source. Update log: October 18, 2026, first release. Rates and thresholds change; the page and the file are refreshed when the IRS publishes 2027 figures.
If you quote the numbers
If you write about the figures, a plain citation of the data page helps your readers check them. A ready sentence:
Source: Big Sale Tax, Exit Tax Map 2026 (https://bigsaletax.com/data/exit-tax-map-by-state/), single filer, asset sale of a business.
Optional lead box
Off unless you add data-lead="1". When it is on, a visitor can type an email to receive their breakdown and Hans Goldstein's one-page seller tax worksheet. The box states who receives the address, and nothing is sent unless the visitor submits. Leads go to Hans, not to you, and are never sold.
Questions
Is the calculator free to put on my site?
Yes. It is free, there is no account, and the only requirement is that the visible Calculator by Big Sale Tax line stays in place.
Does it slow my page or track my visitors?
It loads in a sandboxed iframe, makes no third-party requests, sets no cookies and runs no analytics. Entries stay in the visitor's browser.
Who sees the email address someone types?
Nobody, unless you turn on the optional lead box with data-lead="1" and the visitor chooses to submit. Then the address goes to Hans Goldstein, who sends the breakdown, and not to you.
Are the numbers current?
The widget reads a dated data file and shows the as-of date. Federal figures are IRS Rev. Proc. 2025-32 for 2026 and the state rules are the Exit Tax Map's. Current as of October 18, 2026; it is refreshed when the IRS publishes 2027 figures.
Can I change the colors?
Yes. Set data-theme to light, dark or auto, and data-accent to a six-digit hex color for buttons and the headline number.
Questions or a custom version for your listings pages: contact Hans.
Hans Goldstein is an Enrolled Agent, admitted to practice before the Internal Revenue Service. Not affiliated with or endorsed by the IRS. He is not a CPA or attorney. Education only, not tax or legal advice for your situation.