Try the Bond vs Invest 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/bond-vs-invest-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 Bond vs Invest Calculator
The question of whether to pay extra into a home loan or invest the same money comes up on every South African personal finance site. This widget runs both paths side by side at the reader's bond rate, expected return and marginal tax rate, and shows the after-tax difference over the term. It gives the article a conclusion that depends on the reader's numbers rather than the writer's opinion.
What the widget calculates
Paying an extra amount into your bond gives a guaranteed, tax-free return equal to your bond rate. Investing the same amount gives an uncertain return that is taxed. With prime at 10.75% after the September 2026 increase, that guaranteed return is high.
This compares both over the same period: the interest saved and the term shortened on one side, the after-tax investment value on the other.
The embedded version keeps the inputs and the result. The full Bond vs Invest Calculator on TradeAnswers adds worked examples, the method behind the numbers and a long FAQ.
Who this widget suits
Personal finance blogs
Readers can test their own plan on the page, which is what most of them came to do.
Financial education sites
Put the calculator under the explanation so the concept and the number sit together.
Course and membership pages
Embed it in a planning module. It works inside most course platforms that allow a raw HTML block.
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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.