Two additions before the bill is shared
Restaurant totals involve two separate additions to a menu bill. This page calculates tax and tip from the pre-tax bill, adds both, then divides the result by the number of diners. It assumes the group chooses to tip on the pre-tax amount; some diners intentionally tip on the after-tax total instead.
A four-diner restaurant calculation
An $86.40 bill with 8.875% tax has $7.67 tax. An 18% tip on the bill is $15.55, producing $109.62 in total. Dividing by four yields $27.41 each after cents are rounded. The arithmetic explains why simply adding 26.875% and splitting may differ by a cent.
Equal shares are a group choice
The social mistake is treating an equal split as fair when one person ordered substantially more or abstained from alcohol. Service charges, automatic gratuities, coupons, cash tips, and card surcharges can also be added on different bases and should be listed separately.
What a dinner split cannot govern
Use this for a transparent shared-bill estimate, not for payroll reporting or a statement of legal gratuity rules. It cannot determine local taxability of service charges, calculate a server's wages, or settle a dispute about what the group agreed to pay.
Make the settlement visible
Before sending payment requests, show the menu bill, tax, gratuity rule, additions, and split method. A visible ledger avoids turning a rounding difference into an argument about who paid for what.
Rounding is easiest when the group decides its rule before payment: exact cents, nearest dollar, or one person covering the remainder. A four-way equal split of $109.62 is $27.405 each, so four rounded $27.41 requests total $109.64. Someone must absorb or adjust the two cents. That is not a mathematical error. It is a settlement choice, and recording it beside the tax and gratuity calculation makes the final transfer requests add up to the payment actually made.
A group can choose a different tip base, but it should say so plainly. Changing that base is a choice about gratuity, not a correction to the restaurant's tax.
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