Sales Tax & VAT Calculator

The sales tax and VAT formulas, explained

Adding tax and removing tax are not mirror operations. Adding is a multiplication; removing is a division. Getting that distinction wrong is the most common source of mis-stated invoices, so this calculator implements both directions explicitly rather than offering a single ambiguous field.

Adding tax (tax-exclusive to tax-inclusive)

Gross = Net × (1 + r)
Tax   = Gross − Net

r = tax rate as a decimal (8.85% → 0.0885)

This is the direction US shoppers experience at the register: the shelf price is net, and the tax is added on top. A $249.99 item in a California ZIP code with an 8.85% combined rate becomes $272.11, with $22.12 of tax.

Removing tax (tax-inclusive to tax-exclusive)

Net = Gross ÷ (1 + r)
Tax = Gross − Net

This is the direction UK and EU businesses need when reclaiming VAT from a gross receipt. A £1,200 invoice at 20% contains £1,000.00 of net value and £200.00 of VAT. Note that £200 is 20% of the net figure but only 16.67% of the gross figure — which is exactly why subtracting 20% from the gross total is wrong.

The reverse-VAT trap

Correct:   £1,200 ÷ 1.20 = £1,000.00  (VAT £200.00)
Incorrect: £1,200 × 0.80 = £960.00    (VAT £240.00)

The incorrect method overstates the VAT by £40 on a single £1,200 invoice. Across a year of trading that error compounds into a materially wrong VAT return. The Remove Tax mode here always divides by one plus the rate.

Why US rates are quoted as combined figures

The United States has no national sales tax. Rates are set by states and then layered with county, city and special-district taxes. The figures in this calculator are the state rate plus the average local rate, published annually by the Tax Foundation. Five states — Alaska, Delaware, Montana, New Hampshire and Oregon — have no statewide sales tax at all, though Alaska and Montana permit local levies.

Why UK and EU prices are quoted tax-inclusive

Under the EU VAT Directive (2006/112/EC) and UK consumer-protection law, prices advertised to consumers must include VAT. That is why a German shopper sees €595 on the label for a €500 net item at the 19% standard rate, while a US shopper sees the net price and pays tax at the register. The underlying arithmetic is identical; only the disclosure convention differs.

Worked examples

United States — $249.99 at California's 8.85% combined rate

Adding tax gives a total of $272.11 with $22.12 of sales tax. The same item bought in Oregon, which has no sales tax, costs exactly $249.99. On a $1,299 laptop in Texas at 8.2% the tax is $106.52, for a total of $1,405.52.

United Kingdom — £1,000 net at the 20% standard rate

The gross total is £1,200.00 and the VAT is £200.00. Working backwards from a £1,200 receipt returns exactly £1,000.00 net. Domestic energy at the 5% reduced rate would add only £50 to a £1,000 bill.

European Union — €500 net at Germany's 19% and Hungary's 27%

In Germany the gross price is €595.00 with €95.00 of VAT. In Hungary, which has the highest standard rate in the EU at 27%, the same €500 item costs €635.00 with €135.00 of VAT — a €40 difference on an identical purchase. Sweden at 25% gives €625.00 on a €500 base.

How to use this calculator

1. Choose Add tax if you have a tax-exclusive price, or Remove tax if you have a receipt total that already includes tax.
2. Select your region — United States, United Kingdom or European Union — and the currency updates automatically.
3. Pick your state or country from the dropdown. For the UK and EU, choose the standard or reduced VAT band.
4. Enter the amount you are working from.
5. Open Advanced options to override the rate manually with a precise local figure.
6. Use Share to copy a link to your scenario, or Download CSV to export the breakdown.