Add or remove VAT / sales tax on a price, in seconds
Adds or removes VAT / sales tax on a price, with region presets for the UK, Ireland, Germany, France, Spain, Australia, Canada, New Zealand and US, plus a fully custom mode for anywhere else. Work forward from a net price or backward from a tax-inclusive gross price, and keep a running history of sales and purchases. Free - with an optional VAT Calculator Pro in the Windows app for invoices, your VAT return and the Flat Rate Scheme.
The invoice builder with the domestic reverse charge, a quarter's VAT return summary, and the Flat Rate Scheme check - all in VAT Calculator Pro.
Invoice builder - lines at different rates, with the reverse charge
VAT return summary - boxes 1 to 7 from your saved sales and purchases
Flat Rate Scheme check - flat rate against standard VAT
Pick UK, Ireland, Germany, France, Spain, Australia, Canada, New Zealand, US, or a fully custom region, and the calculator sets sensible default rate options for that region - every default stays editable so you can correct it against your own current source.
Add tax mode takes a net price and works out the tax and the gross price the customer pays. Remove tax mode takes a tax-inclusive gross price - a receipt total, say - and extracts the tax to show the underlying net amount.
Each region shows its standard, reduced and zero rates (where it has them) as one-tap chips, so you don't have to remember or look up the exact percentage for a common scenario.
Net and tax as two segments of a single bar, so you can see at a glance how much of the total is the original price and how much is tax, with the exact figures in matching result cards.
Save any calculation with a short label and it sits in a running history alongside the calculator - not a separate tab you have to switch to, and not a heavyweight ledger, just a quick record of recent figures.
Click Load on any history entry to pull its region, rate and amount straight back into the calculator - useful for re-checking or tweaking a figure you worked out earlier.
Not construction-gated - works for any business adding or removing VAT, GST or sales tax on a price, whatever the trade or industry.
A light/dark toggle that remembers your choice, and "Load sample" fills in a realistic calculation so you can see it working before entering your own numbers.
Adding and removing tax, every region preset and your history stay free, in your browser and on Windows. VAT Calculator Pro is a one-off £3.99 upgrade inside the Windows app for anyone who invoices and does their own VAT, bought through the Microsoft Store - no subscription, no account.
Several lines at different rates - 20%, 5% and 0% on one invoice - with the VAT summary by rate an invoice needs. Prices with or without VAT, copied as text or saved to your history as a sale.
For VAT-registered building and construction services under the CIS: the invoice shows the VAT your customer accounts for to HMRC, and the wording to use.
Mark saved calculations as sales or purchases and see any quarter as boxes 1, 4, 5, 6 and 7 of the UK VAT return - an estimate to check against your records.
See whether the Flat Rate Scheme or standard VAT works out cheaper for your figures, with the first-year discount and the limited cost trader test.
Your history, or one VAT period, as a spreadsheet for your accountant or your bookkeeping software.
| FEATURE | FREE | PRO £3.99 |
|---|---|---|
| Add or remove tax, every region preset | Yes | Yes |
| Running history, sales and purchases, filters | Yes | Yes |
| Use it in your browser | Yes | Windows app |
| Invoice builder with several rates | No | Yes |
| Domestic reverse charge | No | Yes |
| VAT return summary (boxes 1 to 7) | No | Yes |
| Flat Rate Scheme check | No | Yes |
| CSV export | No | Yes |
Free ad-supported web VAT calculators (calculator.net's VAT calculator and similar sites) are the obvious alternative for a one-off sum. Here's how a dedicated, free, ad-free calculator compares for anyone doing this more than once.
| Feature | VAT & Sales Tax Calculator | Free web VAT calculator |
|---|---|---|
| Pricing model | Free - in your browser or on Windows, no adverts. Optional Pro £3.99 one-off | Free, ad-supported |
| Works fully offline | ✓ | ✕ |
| Region presets beyond a single flat rate field | ✓ | ✕ |
| Add tax and remove tax, one toggle | ✓ | ✓ |
| Running history of past calculations | ✓ | ✕ |
| Invoices with several rates, reverse charge and a VAT return summary | ✓ (Pro) | ✕ |
| No ads, no browser tab to keep finding again | ✓ | ✕ |
| Single-purpose, no unrelated features to learn | ✓ | ✓ |
Comparison based on typical free web VAT calculator sites as of August 2026 - features and ad-loads vary by site, so this is a general comparison rather than a specific product review. Not sponsored by or affiliated with any web calculator site.
No. Use it free in your browser - nothing to install and no sign-up. If you'd rather have it on your PC, the Windows app is free on the Microsoft Store too.
The UK, Ireland, Germany, France, Spain, Australia, Canada, New Zealand and US each have a preset for their typical rate(s), plus a fully custom mode for any other country. Every default stays editable so you can correct it against your own current source.
Yes - switch to Remove tax mode and enter the price the customer actually paid (including tax). The calculator extracts the tax amount and shows the underlying net price, useful for pulling VAT out of a receipt or a VAT-inclusive quote.
Add tax mode: tax = net amount x rate, gross = net + tax. Remove tax mode: net = gross / (1 + rate), tax = gross - net. Figures are rounded to two decimal places using round-half-up.
Save any calculation with a short label and it's added to a running history rail alongside the calculator - useful for keeping a quick record of rates and amounts you've worked out recently, without it turning into a full accounting system.
Nothing leaves your device - it's all stored locally between sessions, with no cross-device sync yet.
No - it's a calculator to help you work out a figure quickly, not tax or accounting advice. Rates shown are indicative and can go out of date - always check your region's current rate before relying on a figure for a return or invoice.
Yes - adding and removing tax, every region preset and the history are free, in your browser and in the Windows app. VAT Calculator Pro is an optional one-off upgrade (£3.99) in the Windows app that adds the invoice builder with the domestic reverse charge, the VAT return summary, the Flat Rate Scheme check and CSV export. If you used the app before Pro arrived, Pro is already unlocked for you.
Yes, in VAT Calculator Pro. Switch on the domestic reverse charge in the invoice builder and lines at 20% and 5% are reverse charged: the invoice total excludes that VAT, and it shows the amount your customer accounts for to HMRC and the wording to put on the invoice.
It can't file anything with HMRC. VAT Calculator Pro adds up the sales and purchases you've saved for a quarter and sets them out as boxes 1, 4, 5, 6 and 7, so you have an estimate to check against your records and your accounting or bridging software.
