Add or remove sales tax and VAT from a price

A single-rate tax is a share of the net, not of the gross. To add: multiply net by (1 + rate). To extract: divide gross by that factor, then subtract. 7% of $100 net is $7, not 7% of $107.

gross = net × (1 + t/100)

net = gross ÷ (1 + t/100)

tax = gross − net

One constant rate on the whole amount. US sales tax is set by state and city; this page does not look up ZIP codes. EU VAT names (TVA, IVA, MwSt) share the same formula. No margin schemes, no reverse charge, no mixed rates on one ticket.

Amount

The figure you start from, in one currency, without mixing net and gross.

Rate

The rate that applies. Type 7.25 for a local US rate, 20 for standard French VAT, 15 for Saudi VAT.

Direction

Add tax if you have a net price. Remove tax if the displayed price already includes it.

Assumptions

• A single rate on the whole amount.
• No discounts, deposits or margin VAT.
• You supply the rate; the page does not fetch a tax table.

Limits

• No multi-rate receipts.
• No reverse charge or exemptions.
• This is not tax advice.

The usual trap is subtracting 20% from a gross price. 20% of 120 is 24, but the VAT was only 20. Always divide by 1.20. For a quote, start from the net; the gross follows.

• Subtracting 20% from a gross price.

  Divide by 1.20. Otherwise the net is too low.

• Adding two rates (food 5% + other 20%).

  Each line has its own rate; do not mix them on one amount.

• Assuming a US ZIP has a single nationwide rate.

  Sales tax is local. Type the combined rate that applies to the sale.

• DiscountApply one markdown: the original times (1 − p/100). Stacked percents off are not a sum: 20% then 20% leaves 64% of list, a 36% combined cut, not 40%.
• Profit marginMargin puts profit over selling price; markup puts profit over cost. With $60 cost and $100 price, margin is 40% and markup is 66.7%. You cannot swap the two percents.
• Bill splitTotal, headcount, optional tip. Everyone pays the same share of bill + tip.
• PercentageEnter two numbers of the same kind. The tool returns (part ÷ total) × 100 — useful for a test score, a slice of a budget, or a share of a count.
• TipFrom a bill and a percent, get the tip, the grand total, and an even per-person share. In many US full-service restaurants people leave about 18–20% of the check; that is a custom, not a legal minimum, and not a rating of the meal.
• Hourly to salaryThree numbers: hourly rate, weekly hours, paid weeks. The tool returns the week, the calendar month (year / 12) and the year.

Written by Rédaction HexaCalc (editorial team). Content last updated: August 25, 2026. No third-party medical or financial review is claimed.

This calculation uses a standard mathematical identity. See also the methodology.