How much tax is added to a net price, or included inside a gross price?

Sales tax can be added to a tax-exclusive price or extracted from a tax-inclusive total. Those are different operations because tax inside a gross amount is not simply gross price multiplied by the headline rate.

Adding tax and extracting included tax

The same amount is evaluated in two ways. When treated as net, tax is added to produce a gross price; when treated as gross, the tax-inclusive amount is divided by one plus the rate to recover its net portion.

Tax already included in a gross price is not the same as simply multiplying the gross amount by the tax rate. The calculator uses the entered rate only and does not determine jurisdiction-specific tax treatment.

Choosing the correct tax base

Treating the amount as net: Tax = Amount × Rate ÷ 100 Gross = Amount + TaxTreating the amount as gross: Net = Amount ÷ (1 + Rate ÷ 100) Tax = Amount − Net

Net, tax and gross on one transaction

The worked figures follow the mode represented by the calculator inputs and show the net amount, tax amount and gross amount as separate values.

Price with tax added$1,200.00
Tax added$200.00
Price with tax removed$833.33
Tax already inside$166.67

Why inclusive tax uses division

When tax is added, the net amount is the base. When tax is extracted, the gross amount already contains both base and tax, so the divisor must include the rate.

Rates and rounding beyond a single-tax model

Do not subtract the tax percentage directly from a tax-inclusive price. That produces a different base because percentages depend on their denominator.

  • One tax rate applies to the complete amount.
  • All amounts use the same currency and rounding convention.
  • Compound taxes, exemptions and jurisdiction-specific rules are excluded.

Calculations related to vat and sales tax

The following tools examine neighbouring parts of the same calculation without changing the inputs or assumptions used above.

Quick answers

Frequently asked questions

How do I add VAT or sales tax to a net price?

Treat the entered amount as net; the calculator multiplies it by the tax rate and adds that tax.

How do I remove VAT from a tax-inclusive price?

Treat the amount as gross; net price is gross divided by one plus the tax rate as a decimal.

Why is tax inside a gross price smaller than gross price times the rate?

Because the tax rate applies to the net base, not to the already tax-inclusive total.

Educational content only. This guide is not financial advice.