Sales Tax Calculator

"Add tax" mode starts from a pre-tax (net) price and calculates the tax amount on top of it, giving you the tax-inclusive (gross) total a customer actually pays. "Remove tax" mode works in reverse: starting from a tax-inclusive gross price, it backs out exactly how much of that total was tax and how much was the underlying net price.

These two operations are not simple mirror images of each other using the same multiplication — removing tax from a gross amount requires dividing by (1 + tax rate), not multiplying the gross figure by the tax rate directly. Confusing the two is the most common sales-tax calculation error people make.

Choose whether you are adding tax to a net price or removing tax from a gross price. Enter the PKR amount and the applicable tax percentage — the standard General Sales Tax rate on most goods in Pakistan is 18%, though certain categories carry reduced, zero, or exempt rates.

The calculator instantly shows the tax amount and the resulting total (for add-tax mode) or the net price and tax portion (for remove-tax mode), so you can quote a client or verify a receipt without manual arithmetic.

Adding tax: Gross = Net x (1 + rate), and Tax amount = Net x rate. Removing tax: Net = Gross ÷ (1 + rate), and Tax amount = Gross − Net. Notice that removing tax always divides the gross amount by one plus the rate — it never simply multiplies the gross amount by the rate, which would overstate the true tax portion.

If a product or invoice is subject to multiple layered taxes rather than a single combined percentage, each layer should generally be calculated in sequence on the running total rather than summed into one blended rate, unless your specific compliance framework explicitly defines a single combined rate for that line item.

Suppose a shopkeeper sells an item for a net price of PKR 5,000 before tax, with 18% GST applying. Adding tax: Tax amount = PKR 5,000 x 0.18 = PKR 900. Gross total charged to the customer = PKR 5,900.

Now suppose a receipt shows a tax-inclusive total of PKR 5,900 and you want to know the net price and tax portion. Removing tax: Net = PKR 5,900 ÷ 1.18 = PKR 5,000. Tax amount = PKR 5,900 − PKR 5,000 = PKR 900 — exactly matching the add-tax example in reverse, as it should.

A common mistake would be to instead calculate 18% of PKR 5,900 directly, which gives PKR 1,062 — a significantly wrong tax figure, because it applies the rate to the gross amount instead of correctly deriving the net amount first through division.

Always confirm which tax rate applies to your specific goods or services before calculating, since Pakistan's GST framework includes standard, reduced, and zero-rated categories that differ by product type and, in some cases, by province for services taxed under provincial revenue authorities rather than the federal FBR framework.

When comparing prices across two vendors, check whether their quoted price is tax-inclusive or tax-exclusive before assuming one offer is cheaper than the other — a lower net price with tax added separately can end up more expensive than a slightly higher tax-inclusive quote.

Point-of-sale systems sometimes round tax per line item, per basket, or to the nearest rupee, so small one- or two-rupee differences between this calculator and a printed receipt are usually just a rounding policy difference, not a wrong tax rate or a calculation error.

If you need to work out a discount before applying tax, or want to check what percentage one number represents of another, the Percentage Calculator handles those general percentage operations that often come up alongside tax math on an invoice. For a broader view of how a purchase fits into your monthly budget once tax is included, the Finance Calculator hub links to related planning tools.

If you are quoting a client for services and need to also factor in a loan repayment or financing cost for equipment, the Loan Calculator or Payment Calculator can help you build the full cost picture before you finalize a tax-inclusive quote.