Free · No sign-up · 100% offline

Free sales tax & VAT calculator

Add tax to a net invoice amount, or pull the tax back out of a tax-inclusive total (reverse VAT) — for any rate, in any currency. See the net, the tax and the gross side by side so your invoices add up. Runs in your browser, nothing uploaded.

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Add tax, or work it backwards — both in one tool

Two tax questions come up constantly on invoices. The first is forward: you have a net price and need to add tax to it. The second is reverse: you have a total that already includes tax and need to know how much of it is tax — the classic "remove VAT" calculation. Doing the reverse one in your head is where mistakes happen, because you cannot just subtract the percentage; you have to divide. This calculator handles both cleanly.

In add-tax mode, enter the net amount and a rate and it shows the tax and the gross total. In remove-tax mode, enter a tax-inclusive total and it shows the net amount and the exact tax inside it. Either way it displays the net, the tax and the gross together, so the numbers on your invoice are never ambiguous.

What it works out

Add tax (net → gross)

Net amount plus the rate gives you the tax and the gross total to charge.

Remove tax (reverse VAT)

Pull the tax back out of a tax-inclusive total to find the true net.

Editable rate + presets

Common example rates one tap away, fully editable to match your own.

Net, tax & gross

All three shown together so your invoice line items reconcile.

Any currency

Prefix-only currency picker for clean invoices in your market.

Private & offline

Runs entirely in your browser. Your amounts never leave your computer.

How to use it in 3 steps

  1. Pick a mode — add tax to a net amount, or remove tax from a total.
  2. Enter the amount and rate — type your rate or pick a preset.
  3. Read net, tax and gross — copy the figures straight onto your invoice.

From tax to a finished invoice

Once the tax is right, the rest of the paperwork stays offline too: drop the figures into the invoice generator, set what you net after payment fees, price marked-up costs with the markup & margin calculator, and keep the tax you collect visible in the expense & tax tracker. All offline, one-time purchases, no subscription. Get the core five in the $39 Freelance Tools Suite · also on Payhip.

Frequently asked questions

Is this calculator free?
Yes, completely. It runs in your browser with no account and nothing uploaded. There is no paid version of the calculator itself.
How do I add tax to a price?
Multiply the net by the rate for the tax, then add it. $100 net at 20% = $20 tax, $120 gross. The tool shows all three.
How do I remove VAT from a total?
Divide the inclusive total by (1 + rate) for the net, then subtract for the tax. $120 at 20% = $100 net, $20 tax. Use remove-tax mode.
What rate should I use?
It depends on your country, registration status and product. The tool pre-fills example rates but every value is editable. It's a helper, not tax advice.
Is my data private?
Completely. Zero network requests — your amounts stay on your computer.

More free tools for freelancers

Part of a set of offline, no-subscription tools that cover the whole freelance workflow:

Get the tax right, every invoice

Add tax or reverse it out in two seconds, for any rate. Free, no account, nothing uploaded.

Open the calculator → See all the tools →