VAT / Sales Tax Calculator — Add, Remove & Reverse

Real-world use cases

• Add VAT to a net quote for a B2B client

  A client asks for the all-in price on a $2,400 net service quote and you bill at 20% VAT. Open add-tax mode, enter 2400, set the rate to 20: the breakdown reads net $2,400.00, tax $480.00, gross $2,880.00. Copy the all line straight into the email so the client sees the split, not just a single number. Steps: pick "Add tax", type the net, tap the 20% preset, copy. The split matters because a VAT-registered buyer reclaims the $480 and only cares about the $2,400 net, while a consumer cares about the $2,880 they actually pay.

• Back out the VAT hidden in a receipt to file an expense

  Your expense system wants the net and the VAT separately, but the coffee-shop receipt only prints the £14.40 gross total at 20%. Open remove-tax mode, enter 14.40, rate 20: net £12.00, VAT £2.40. Type those two numbers into the expense line. Steps: pick "Remove tax", type the gross from the receipt, read net and tax. Doing this by hand people reach for 14.40 × 0.20 = £2.88 and overclaim the VAT by 48p — the divide-by-1.2 method this tool uses is the one HMRC and every tax authority expects.

• Check the tax rate on a foreign receipt you can't read

  You're back from a trip with a hotel folio that shows a net room rate and a larger total but no rate printed, in a language you don't read. Open find-the-rate mode, enter the net and the gross: it reports the implied percentage, e.g. net 100 and gross 110 gives 10%. Steps: pick "Find the rate", type the two figures, read the percent. Now you can tell whether the line you were charged is a standard VAT, a city/tourist tax, or a service charge that shouldn't be taxed at all.

• Price a tax-inclusive shelf label from a net cost

  You run a small shop and price everything tax-inclusive on the sticker, but your supplier costs and margins are tracked net. A product nets $7.50 and you mark it up to a $12.00 net price; at 8% sales tax the shelf label needs the gross. Add-tax mode, enter 12, rate 8: gross $12.96, round to a clean $12.99 if you prefer. Steps: enter the net price, set your local rate, read the gross, and that is the number that goes on the sticker.

• Build an invoice line with quantity in one shot

  You're invoicing 15 units at a $40 net unit price plus 13% tax and want the line total split out. Add-tax mode, enter unit 40, set quantity 15, rate 13: the line reads net $600.00, tax $78.00, gross $678.00. Steps: type the unit price, put the count in the quantity field, set the rate, copy the all line into your invoice row. The quantity field saves you the separate 40 × 15 multiply and keeps the tax math on the line total, not the unit, which is what most invoice formats want.

Common pitfalls

• Multiplying the gross by the rate to get the tax. The tax inside a tax-inclusive price is gross − gross/(1+rate), not gross × rate. At 20%, a $120 gross holds $20 of tax, not $24. Use remove-tax mode.

• Adding tax to a price that already includes tax. If a shelf price is already gross, running add-tax on it taxes the tax. Check whether your starting number is net or gross before you pick a mode.

• Treating two stacked taxes as automatically additive. State plus city tax on the same net base does add (6% + 2% = 8%), but a true compound tax on an already-taxed amount needs two sequential passes.

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