Value Added Tax is charged on most goods and services in more than 170 countries, at rates from 5% to 27%. Whether you're a freelancer writing your first invoice, a shopper reclaiming tax at the airport, or a business owner filing a return, the calculations are simple — but one of them is famously easy to get wrong.
Adding VAT: the easy direction
To add VAT to a net price, multiply by one-plus-the-rate. At 20%, a 250 service becomes 250 × 1.20 = 300: you invoice 300, keep 250, and owe 50 to the tax authority. Nothing subtle about it.
Removing VAT: where everyone slips
Going backwards — finding the net amount inside a VAT-inclusive price — is where the classic mistake lives. The instinct is to knock 20% off: 300 minus 20% is 240. Wrong. The VAT was charged on the net figure, not the gross, so you must divide by 1.20 instead: 300 ÷ 1.20 = 250. Subtracting the percentage understates the net price and overstates the reclaimable VAT — an error that shows up in real expense reports and bookkeeping all the time.
A useful sanity check: at 20%, the VAT inside a gross price is one-sixth of it, not one-fifth. If those fractions make your head spin, that's precisely what our VAT calculator's 'remove VAT' mode is for.
VAT vs sales tax
American readers know sales tax, which is added once, at the final sale to the consumer. VAT is different plumbing for a similar outcome: it's collected in slices at every stage of the supply chain, with each business reclaiming the VAT it paid to its suppliers. The consumer still bears the full amount in the end, but governments like VAT because it's harder to evade and self-polices through the reclaim system.
One practical consequence: in VAT countries, advertised prices usually include the tax, while US shelf prices usually exclude sales tax. Keep that in mind when comparing prices across borders.
Rates change — check yours
Standard rates currently range from 5% in the Gulf states to 27% in Hungary, with most of Europe around 19–25%, and nearly every country runs reduced rates for essentials like food, books, or medicine. Rates and rules change with budgets, so for anything official, confirm the current rate with your local tax authority — then let the calculator do the arithmetic.
Common invoicing and bookkeeping mistakes
Charging VAT on an expense you shouldn't (or forgetting it on one you should) is a frequent error for new freelancers — registration thresholds and exemptions vary by country, so check whether you're even required to charge VAT before you put it on an invoice.
Mixing VAT-inclusive and VAT-exclusive figures in the same spreadsheet is another classic — always label columns clearly as net or gross, because a single mislabeled column can throw off an entire quarterly return.
Forgetting that reduced or zero rates apply to some categories is a third — a shop selling both standard-rated and reduced-rated goods needs to track them separately, not apply one blanket rate to everything.