Back to the TD.1 return

The browser extension

It carries the figures from the TD.1 summary into the return on the Tax Department's portal, one field at a time. Nothing is typed until you press “fill” for that particular figure.

The extension never presses Submit, and never clicks anything on the form. It only writes values into the fields you pointed it at.

Which portal depends on the year: the 2025 return is filed in TAXISnet, and individuals move to Tax For All from 2026. Version 0.2 carries a field map checked against the real TAXISnet 2025 form. For Tax For All the map is not verified yet, so the extension shows your rows there but does not fill.

Install from the Chrome Web Store

The listing is reviewed by Google and updates itself. This is the way in for almost everyone.

Open in the Chrome Web Store

Chrome, Edge, Brave, Opera and other Chromium browsers. Firefox and Safari are not supported.

Installing without the store

If the store is not available to you, the same extension installs as an unpacked folder. It works identically; it just does not update itself.

Download the extension (ZIP)
  1. Download the ZIP above and unpack it. Keep the unpacked folder somewhere permanent: the browser reads it from that path on every start, so deleting it uninstalls the extension.
  2. Open chrome://extensions in the address bar.
  3. Turn on “Developer mode”. The switch is in the top right corner.
  4. Press “Load unpacked” and pick the folder you unpacked. It is the one holding manifest.json.
  5. The extension appears in the list. You can pin it to the toolbar, but you do not have to; its panel opens on the return by itself.

Using it

  1. Fill in your income and deductions on the TD.1 return page here, and check the summary.
  2. Press “Send to the browser extension”. If the extension is not found, the same figures go to the clipboard as JSON instead, and its popup accepts them as a paste.
  3. Open your own TD.1 return for 2025 in TAXISnet, in English, and sign in. A panel appears with every line of the summary.
  4. For each line: “Show” highlights the field on the page, you check it, and “Fill” writes it. The code and the amount are separate actions. A row without a verified destination can only be copied and placed by hand.
  5. Read every figure against your own documents, then submit the return yourself.

What it can and cannot do

  • It can write into text fields, dropdowns and text areas on the tax portal, and only after you press “fill” for that figure.
  • It cannot press Submit, click page controls, or write into password, file or hidden fields; those are refused whatever a binding says.
  • Your figures stay in the browser's own extension storage. Nothing is sent anywhere, and the extension has no server of its own.

The source

The extension is plain JavaScript with no build step and no dependencies: the folder you install is the folder that was written. Read it before you trust it.

What leaves your browser, and when