Add or remove VAT
Two calculations everyone re-derives in a hurry: putting tax on a net price, and pulling the tax back out of a tax-included one. The second is not “minus 10%”, and that difference is exactly where invoices and expense claims go wrong.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Enter the amount and say what it is: without tax (to add it) or tax-included (to remove it).
- Pick a preset rate or type your own. Set the rounding if it has to match a document.
- Read net, tax and gross — they recalculate as you type.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine from a public CDN — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
Removing 10% VAT is not the same as subtracting 10%. Why?
Because the tax was charged on the net, not on the total. A 1,100 total at 10% contains 100 of tax (1,100 ÷ 1.10 = 1,000 net). Subtracting 10% of the total would remove 110 and leave a wrong net of 990. The error grows with the rate — at 20% it is a sixth of the tax — and it compounds quietly across a spreadsheet.
Which rounding should I use?
Whatever the document you must match uses. On Japanese qualified invoices the tax amount is rounded once per rate, and rounding down is the most common choice; many European sellers round half-up per line or per invoice. This tool rounds the tax the way you choose and derives the remaining figure from it, so net plus tax always equals gross exactly.
Does it handle Japan’s reduced 8% rate?
Yes — 10% and 8% are the first two presets. The reduced rate applies to items such as take-away food and drink and newspaper subscriptions, and a qualified invoice has to show the base and tax for each rate separately. Run the calculator once per rate and you have exactly those figures.
Is anything uploaded?
No. It is arithmetic inside this tab, and the page works with the internet switched off. Type any figure you like — nobody sees it.