Add sales tax to a price to find the total, or remove it from a tax-inclusive total to find the pre-tax amount.
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Use 'add tax' when you know the shelf price and want the checkout total. Use 'amount already includes tax' to split a receipt total back into the pre-tax price and the tax portion, which is handy for expense reports and bookkeeping.
Suppose you buy an item priced at $100 in a place with an 8.25% sales tax rate, adding tax to the amount.
Result: An 8.25% sales tax on $100 adds $8.25, for a total price of $108.25.
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