How to use

This calculator works with a tax rate you provide. Start from a pre-tax subtotal to add tax, start from a tax-inclusive total to reverse the tax, or enter subtotal and total to recover the effective percentage between them.

Choose add tax, remove tax, or find the rate.
Enter the amount and rate, or enter subtotal and total when solving for the rate.
Review the pre-tax subtotal, tax amount, final total and effective rate.

How it is calculated

Add tax: tax = subtotal × rate ÷ 100; total = subtotal + tax. Reverse tax: subtotal = total ÷ (1 + rate ÷ 100)

Example

Example: a 100 subtotal at 8.25% produces 8.25 tax and a 108.25 total. Starting from 108.25 as tax-inclusive with the same rate reverses to a 100 pre-tax subtotal.

Important notes

This calculator does not determine the legally applicable rate or whether an item is taxable. Use the official rate for the transaction and jurisdiction. Compound taxes, exemptions, thresholds or fixed fees may need a different calculation. Mihsaba keeps VAT as a separate calculator intent.

Frequently asked questions

How do I remove tax from a tax-inclusive total?

Divide the total by 1 plus the tax rate as a decimal, then subtract the recovered subtotal from the total.

Does this calculator look up my local rate?

No. Enter the official combined rate that applies to your transaction.

Is sales tax the same as VAT?

The percentage arithmetic can be similar, but legal treatment and search intent differ, so Mihsaba keeps them as separate tools.

Is this calculator free?

Yes. It is free to use and requires no account.

Sales Tax Calculator