By: If you run a WordPress site connected to cars in Portugal — a dealership, a blog for expats, a small business — you have probably heard the question: “How much tax will I pay to import this car?”. Answering one by one is slow, and it sends your visitor off your page to find the number elsewhere. Clara Carros has a simple fix: a free, official plugin that puts a working ISV (import tax) and IUC (road tax) calculator right inside your own WordPress site, with no code at all.
What the plugin does in Portugal
The plugin adds a calculator to your WordPress site built on the official Portuguese formula. Your visitor types in the car details — engine size, CO² emissions, fuel and age — and instantly gets an estimate of the ISV due on import and the yearly IUC. It all happens on your page. The visitor stays with you, finds a useful tool, and you did not have to build anything.
Who wants this
- Dealers and importers: if you sell cars or handle imports, you get this question every day. The calculator answers it on its own and frees up your team.
- Car and expat blogs: an article about buying a car in Portugal is far stronger with a real tool than with text alone.
- Small businesses and workshops: any site that wants to give visitors a practical extra without hiring a developer.
The goal is always the same: keep the person on your page and give them a concrete answer instead of sending them somewhere else.
How to install it, step by step
You do not need to know how to code. It is three steps.
- 1. Install the plugin. In your WordPress dashboard, go to Plugins → Add New, search for “Clara Carros ISV/IUC Calculator”, click Install and then Activate. You can also download it straight from the official WordPress.org plugin page.
- 2. Pick where it shows. Open the page or post where you want the calculator.
- 3. Drop the calculator in. Write the shortcode
[claracars_isv]where you want it to appear. If you use the Gutenberg block editor, you can instead search for the “Clara Carros Calculator” block and add it with one click. Save the page and you are done.
From then on, the calculator is live for every visitor, with no further setup.
What the visitor sees
Picture someone looking at a used diesel brought in from Germany. On your page they fill in: engine 1968 cc, emissions 120 g/km CO² (WLTP), fuel diesel, first registered in 2019. One click, and they immediately see the estimated ISV due at legalisation and the IUC they will pay every year. No leaving your site, no spreadsheets, no waiting on anyone.
If your site is not WordPress
The plugin is WordPress-only, but there are other ways to get the same calculator. You can use the iframe widget, which drops onto almost any web page by copying a small block of code, or the JavaScript version, for anyone who wants more control over the look. Both options, like the plugin, are documented on the developer and API page. That same page also explains how to wire the calculations straight into your own system if you prefer.
Honest notes
- It is free. No cost to install and no cost to use.
- It asks for a small attribution. The calculator shows a visible link back to Clara Carros. That is our only condition for giving it away.
- The figures are estimates. They use the official formula, but they are for guidance; the final amount is always the one the tax office sets on the day.
- We are a dealer/importer. Clara Carros is a car import and sales business that built this free tool. We are not a public body or a neutral service.
The calculator and tools give you the numbers. If you would rather we find, verify, import and deliver the car for you, see our turn-key import service and our car sourcing.
Frequently asked questions
Is the plugin really free?
Yes. Installing and using it costs nothing. In return, the calculator keeps a small visible link to Clara Carros.
Do I need to know how to code to install it?
No. It installs like any other WordPress plugin and goes in with the shortcode [claracars_isv] or the Gutenberg block. There is no code to write.
Are the numbers official?
They use the official Portuguese ISV and IUC formula, so they are reliable as an estimate. The final figure is always the one confirmed by the Tax Authority at legalisation.
Keep exploring
If you want to take Clara Carros tools further, see also the MCP server for using the data in ChatGPT, the free cars API and the Chrome extension that shows the ISV on mobile.de.