Try the Marginal Tax Rate Calculator Widget
Free for any site, including commercial ones. Keep the small credit line at the bottom of the widget so readers can find the full version. Nothing is stored about the people who use it. See the disclaimer.
How to add it to your site
- Copy the code Use the copy button in the Embed code box so nothing is lost to line wrapping. It is a single iframe tag and it does not need anything else.
- Open the page you want it on In WordPress add a Custom HTML block, in Wix use the Embed HTML element, in Squarespace use a Code block, and on a hand-built site paste it straight into your HTML.
- Paste and publish The widget appears immediately. If you see an empty space instead, your editor has stripped the iframe tag, which the HTML embed guide explains how to work around.
- Adjust the look if you want to Add the parameters in the table below to the iframe URL to change the theme, the accent colour or the height. Nothing needs to be configured on our side.
Customisation options
| Parameter | Values | What it does |
|---|---|---|
theme | auto, light, dark | Default follows the reader's own system setting, so the widget looks right on a dark site and a light one without you choosing. |
accent | Six hex digits, e.g. accent=1A56DB | Recolours the header bar and the primary button to match your brand. |
header | 1 or 0 | Set to 0 to hide the title bar when your page already has a heading above the widget. |
breakdown | 1 or 0 | Set to 0 to hide the calculation breakdown for a more compact block. |
corners | 1 or 0 | Set to 0 for square corners if your design has no rounding anywhere else. |
width | full | Removes the 520px maximum so the widget stretches to its container. |
Parameters are added to the iframe URL as a normal query string, for example
/embed/marginal-tax-rate-calculator.html?theme=dark&accent=1A56DB&header=0. The
widget builder lets you set all of them visually and hands you the finished code.
Why embed the Marginal Tax Rate Calculator
Traders who earn a salary often do not realise their trading profit is taxed at the top of their income, not the bottom. The widget takes other income and the trading profit and shows the bracket the next rand falls into and how much of the profit the tax takes. Tax guides for traders and side-hustle finance content can embed it where the point is made.
What the widget calculates
A marginal tax rate calculator answers the question that matters when you make a trading profit: how much of it do you keep. Your salary sets the bracket you start in, and the profit is taxed on top of it.
If SARS treats your trading as revenue rather than capital, the profit is added to your other income. A R50,000 gain can therefore be worth R39,500 to one person and R27,500 to another, purely because of where their salary already put them.
The embedded version keeps the inputs and the result. The full Marginal Tax Rate Calculator on TradeAnswers adds worked examples, the method behind the numbers and a long FAQ.
Who this widget suits
Tax and accounting blogs
Readers can check their own figures against the current SARS rules where they read about them.
Payroll, HR and small business sites
A working South African tax tool inside a help page saves a support question.
Personal finance sites
A tool with the current year built in is more useful than a table that goes stale.
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The full library of free trading widgets has more than a hundred tools, and the widget builder lets you preview and configure any of them before you copy the code.