How Tipping Works — and How to Split It Fairly

Tipping is a gratuity in name and a wage subsidy in practice: in much of the US service industry, tips aren't extra — they're the majority of the worker's pay. That's why the percentages feel load-bearing, why the "tip on what?" question causes so many table arguments, and why splitting a group bill fairly takes one clear decision made before the check arrives.

Why tips are load-bearing

US federal law allows a tip credit: employers can pay tipped workers as little as $2.13 per hour — a figure unchanged since 1991 — as long as tips bring earnings up to at least the $7.25 federal minimum wage. If they don't, the employer must make up the gap. A handful of states (including California, Washington, and Minnesota) require the full state minimum wage before tips, and those states don't have notably worse service — but in most of the country, a 0% tip doesn't send a message to the owner; it comes out of the server's rent. That's the practical reality behind the customary 15–20%.

The standard percentages

For full sit-down table service in the US, 15% is the floor for acceptable service, 18–20% is the normal range, and 20%+ signals excellent service. Other situations carry their own conventions, less standardized and more regional:

• Takeout/counter pickup — often 0–10%; the tipping screen is increasingly expected but a small tip is fine
• Food delivery — typically 10–20%, more in bad weather or for big orders
• Bars — about $1–2 per drink, or 15–20% of the tab
• Hairstylists, taxi/rideshare — commonly 15–20%

Outside the US the conventions flip: in Japan tipping can be politely confusing or even refused, and much of Europe builds a service charge into the price, with rounding-up as a gesture rather than an obligation. When traveling, the local default beats any home-country habit.

The math: percent of what?

The tip is a percentage, and the only real question is the base. Tip on the pre-tax subtotal and you reward service on the food, not the government's cut — the cleaner convention (see how sales tax works). Tip on the post-tax total and the number is bigger, but it's the one printed at the bottom of the receipt, so it's what most people use. On a $100 pre-tax bill with 8% tax, a 20% tip is $20.00 on the subtotal versus $21.60 on the taxed total — a $1.60 difference, which is exactly the size of most tipping debates.

A worked example: an $86.40 bill, tipped 18% on the subtotal:

tip   = 86.40 × 0.18 = 15.55
total = 86.40 + 15.55 = 101.95

The same bill at 15% tips $12.96 and at 20% tips $17.28. The honest range on a standard bill is a few dollars wide — worth knowing both when you're budgeting the evening and when you're evaluating whether a preset screen is nudging you.

Splitting a group bill fairly

Groups fail at tipping in predictable ways: the person who "does the math" tips on their entree alone, the group tips twice by accident when everyone adds a card slip, or the equal split charges the salad-eater for the steak-eater's wine. Three approaches cover every case:

• Equal split of the total — simplest, fair when orders are similar, and one tip gets added exactly once
• By-order split — each person pays their own items plus their proportion of the shared tax and tip
• Weighted split — agreed weights (1 for a light order, 2 for a heavy one) so the shares stay proportional and the books still balance to the cent

The mechanics of each method, including rounding and the overage it creates, are laid out in how to split a bill. The one rule that matters before any method: decide the tip amount once, as a group, before anyone reaches for their wallet.

Tip pools: splitting among the staff

The mirror-image problem happens behind the counter. Many restaurants pool tips and distribute them at shift's end — a legal arrangement in the US as long as owners and managers don't take a cut. Two fair distribution rules exist:

Equal share: divide the pool by the number of staff. A $540 pool across 5 servers pays $108 each — simple, but it ignores that some people worked twice as many hours.

Hours-weighted: divide the pool by total hours worked, then multiply by each person's hours:

share = pool × (myHours / totalHours)

With hours of 9, 7, 6, 5, and 3 (30 total), the $540 pool divides into $18 per hour worked: $162, $126, $108, $90, and $54 — the same $540, allocated to match effort instead of headcount.

Try it yourself

The Tip Calculator computes the tip and total at several percentages at once, with an option to tip on the pre-tax or post-tax amount. The Bill Splitter handles the group case — equal or per-person splits with tax and tip divided fairly. And the Tip Pool Calculator distributes a pooled amount across staff, by headcount or weighted by hours.