Should I tip on the total after tax or before tax?

Tip on the subtotal before sales tax. The tax is collected for the government, not earned by the server, so tipping on the post-tax total overstates the gratuity by whatever the local sales tax rate is; on a 120 bill with 8 percent tax, tipping 20 percent before tax gives 24, while tipping 20 percent after tax would give 25.92 instead.

What is a normal tip percentage in the US?

For sit-down table service, 18 to 20 percent of the pre-tax bill is standard, with 15 percent for below-average service and 25 percent or more for exceptional service or demanding large groups. Counter service, takeaway and delivery are typically tipped less, often 0 to 10 percent, even though many card readers now suggest 15 to 20 percent by default.

Do I still tip if a service charge is already on the bill?

Generally no, or only a small amount extra for outstanding service. In the UK a discretionary service charge of 10 to 12.5 percent commonly appears on the check at larger restaurants and is treated as the tip; in the US, an automatic gratuity of 18 to 20 percent is often added for large parties, and stacking a further tip on top of either is a common overpayment.

How do I split a bill fairly when people ordered different amounts?

An even split across the group only works when orders are similar in cost. Where one diner ordered much more than another, add up each person's items separately, split the tax and tip proportionally to each person's subtotal, and use those individual totals instead of dividing the grand total by the headcount.

Are tips taxable income for servers?

Yes, in the US all tips received by an employee, whether cash or added to a card, are taxable income subject to federal income tax and Social Security and Medicare tax, and employees are required to keep a daily record and report tips of 20 dollars or more in a month to their employer, per IRS Publication 531.

Does rounding up when splitting a bill matter?

It can. An exact even split of a 153.60 total across five people comes to 30.72 each; many groups instead round each share up to 31 or 35 to cover cash-handling gaps or a card surcharge the venue passes along, which collects slightly more than the bill actually requires.

Tip and bill split calculator

Splitting a restaurant tab evenly is fast but only fair when the tip is calculated on the pre-tax bill and everyone genuinely ordered a similar amount. This calculator takes the bill before tip, a tip percentage, any tax already added to the check, and the number of diners, then works out the tip amount and the flat share each person owes so nobody has to do the mental arithmetic at the table.

What counts as a normal tip

In the United States, table service at a sit-down restaurant is customarily tipped 18 to 20 percent of the food and drink total before tax, with 15 percent treated as the low end for adequate but unremarkable service and 25 percent or more reserved for exceptional service or a small group taking up a table for a long time. Counter service, delivery and takeaway typically draw a smaller tip, often 0 to 10 percent, though many point-of-sale screens now default to 15 to 20 percent regardless of the format.

Outside the US the baseline is much lower. In the UK, a discretionary service charge of 10 to 12.5 percent is often already added to the bill at larger restaurants, and diners are not expected to tip further on top of it unless service was outstanding; where no service charge appears, rounding up or leaving 10 percent is common but far from obligatory. Much of continental Europe, Japan and Australia treat tipping as optional or unusual outside of tourist-heavy venues, so a UK or Australian traveler using an 18 to 20 percent US-style default will overpay relative to local norms.

Whatever percentage is chosen, the tip almost always applies to the subtotal before sales tax, not the after-tax total, because the tax is money the restaurant collects on behalf of the government rather than revenue for the server. Tipping on the post-tax total is a common mistake that quietly inflates the gratuity by whatever the local sales tax rate happens to be.

Three worked splits

A dinner bill of 120 before tax, tipped at 20 percent, adds a 24 tip. With 9.60 in tax already on the check (an 8 percent rate) and the group at five people, the table total comes to 153.60, and each diner owes 30.72.

A quick lunch for two comes to 64 before tax, tipped at a more modest 15 percent for counter service, with no tax added separately because it was already folded into the menu price. The tip is 9.60, the total is 73.60, and each person owes 36.80 if split evenly, though a couple ordering unevenly might instead split by what each actually ordered plus half the tip.

A large group dinner runs to 340 before tax, tipped generously at 22 percent for good service on a big table, with 27.20 in tax (8 percent) and eight people splitting the check. The tip is 74.80, the grand total is 442.00, and each diner's even share is 55.25.

Where an even split stops being fair

Dividing the total by the headcount only works well when everyone ordered roughly the same amount. Once one diner orders a steak and a bottle of wine while another has a salad and water, an even split effectively has the lighter eater subsidizing the heavier one, sometimes by a meaningful amount on a large bill. The fairer approach in that case is to itemize what each person ordered, add their share of tax and tip proportionally, and use an even split only as a fallback for groups that genuinely order similarly.

The calculator also assumes a single flat tip percentage for the whole table, which breaks down when a group wants to tip more generously for exceptional service than the house default, or when a service charge has already been added to the bill and a further tip would double up. Check the printed check carefully before adding a tip on top of an included service charge; doing so is common at large parties in the US, where restaurants often add an automatic 18 to 20 percent gratuity for tables of six or more, and adding another 20 percent on top is a frequent and avoidable overpay.

Rounding also matters at the margins. Splitting 153.60 across five people gives an exact 30.72 each, but many real-world splits round each share up to the nearest dollar or unit of currency so the collected total slightly exceeds the bill, covering the inevitable rounding gaps in cash payment or covering a card processing fee the venue passes on.

Currency, card fees and paying separately

Because the inputs here are unitless amounts, the same numbers work in dollars, pounds, euros or any other currency; only the local tipping norm and tax treatment change, not the arithmetic. A UK diner working from a bill that already lists a service charge line should typically set the tip percentage to zero and treat the printed service charge as already included in the bill total, rather than tipping again on top through this calculator.

Some venues charge extra for splitting a card payment across several cards, or apply a surcharge to card payments generally; neither cost is modeled here and should be added to the total manually before dividing by the number of diners. Where a restaurant instead offers to split the bill directly on its own card terminal, that built-in tool usually already accounts for tax and any service charge correctly, and this calculator is most useful as a quick sanity check on the number it produces.

Frequently asked questions

Should I tip on the total after tax or before tax?: Tip on the subtotal before sales tax. The tax is collected for the government, not earned by the server, so tipping on the post-tax total overstates the gratuity by whatever the local sales tax rate is; on a 120 bill with 8 percent tax, tipping 20 percent before tax gives 24, while tipping 20 percent after tax would give 25.92 instead.
What is a normal tip percentage in the US?: For sit-down table service, 18 to 20 percent of the pre-tax bill is standard, with 15 percent for below-average service and 25 percent or more for exceptional service or demanding large groups. Counter service, takeaway and delivery are typically tipped less, often 0 to 10 percent, even though many card readers now suggest 15 to 20 percent by default.
Do I still tip if a service charge is already on the bill?: Generally no, or only a small amount extra for outstanding service. In the UK a discretionary service charge of 10 to 12.5 percent commonly appears on the check at larger restaurants and is treated as the tip; in the US, an automatic gratuity of 18 to 20 percent is often added for large parties, and stacking a further tip on top of either is a common overpayment.
How do I split a bill fairly when people ordered different amounts?: An even split across the group only works when orders are similar in cost. Where one diner ordered much more than another, add up each person's items separately, split the tax and tip proportionally to each person's subtotal, and use those individual totals instead of dividing the grand total by the headcount.
Are tips taxable income for servers?: Yes, in the US all tips received by an employee, whether cash or added to a card, are taxable income subject to federal income tax and Social Security and Medicare tax, and employees are required to keep a daily record and report tips of 20 dollars or more in a month to their employer, per IRS Publication 531.
Does rounding up when splitting a bill matter?: It can. An exact even split of a 153.60 total across five people comes to 30.72 each; many groups instead round each share up to 31 or 35 to cover cash-handling gaps or a card surcharge the venue passes along, which collects slightly more than the bill actually requires.

Sources

IRS, Publication 531: Reporting Tip Income — Confirms that all employee tips, cash or charged, are taxable income subject to federal income tax, Social Security and Medicare tax, per the December 2024 revision of Publication 531.
HMRC, Guidance on tips, gratuities, service charges and troncs (E24) — Sets out when UK employers must apply PAYE and National Insurance to tips, gratuities and service charges collected through a tronc; guidance last updated 18 July 2025.