Tipping for large groups: the auto-grat rule in 2026.
Most US restaurants apply an 18–20% auto-gratuity for parties of six or more. Below: where that threshold comes from, three worked examples (including a share-based split), and the edge cases that come up at every birthday dinner.
18–20% auto-gratuity for parties of 6+ is the customary US rule in 2026, applied to the pre-tax subtotal and disclosed on the menu under IRS Rev. Rul. 2012-18.
Read the bill before adding more. If the service was unusual — a complicated split, a celebration, a long table — a 2–4% top-up in cash to the server is the modern thank-you.
The number, and where it comes from
The 18–20% figure is the convergence of regulation and etiquette. The Emily Post Institute lists 18–20% as the recommended auto-grat for parties of six or more, the same range it has held since 2018. The IRS draws a sharper line: Revenue Ruling 2012-18, in effect since 2014, classifies any mandatory party-size charge as a service charge, not a tip — which means the restaurant pays payroll tax on it and the server receives it as wages, not as a tip-pool draw. The practical consequence: the menu must disclose the threshold and percentage, and the server cannot pocket it the same way as a voluntary tip. Bankrate's June 2025 Tipping Survey shows 81% of US adults expect auto-grat on parties of eight or more; 56% expect it on parties of six. That gap is the source of most confusion.
Three worked examples
Example 1 — Party of 8, 20% auto-grat
Example 2 — Share-based split, $180 / 5 with uneven orders
Each person's share is (their subtotal ÷ group subtotal) × group total. Alex's coffee subsidizes nobody.
Example 3 — Party of 12, one separate check
The auto-grat is calculated on the combined party size, not per check. Splitting checks does not avoid it.
Edge cases
The threshold varies by region
Six is the modal threshold across the US, but it isn't universal. Most Las Vegas Strip restaurants set the line at four, a holdover from convention-and-cabana service models. Several Southern chains (Cracker Barrel, some Waffle House locations) hold the line at eight. International cruise ships, which dock in US ports but operate under flag-of-convenience rules, apply auto-grat to every check regardless of party size. Always read the bottom of the menu — the threshold and percentage are required disclosures under the IRS service-charge rule.
Auto-grat must be disclosed on the menu
Under IRS Rev. Rul. 2012-18, a charge is only a service charge (and not a tip) if the customer cannot freely choose to leave it. If the restaurant didn't disclose the auto-grat on the menu, a guest can legally refuse to pay it and leave a voluntary tip instead. The disclosure is usually a small line at the bottom of the menu: "An 18% gratuity will be added to parties of 6 or more." If it isn't there and the server presents an auto-grat charge, ask to see the menu's disclosure — and if there isn't one, ask the manager to remove the line.
Splitting the auto-grat among guests
The cleanest way: divide the post-grat, post-tax total by the head count. Each person pays an even share that already includes their share of the auto-grat. The messier way: one person picks up the bill on a card and the others Venmo back. In that case, the bill-payer should screenshot the receipt with the auto-grat line visible before the request goes out, because otherwise three people in the group will assume the auto-grat is the tip line and try to add 20% more.
The birthday person
If you're hosting, you cover the birthday person's meal and tip on their portion. Don't subtract their food from the subtotal before calculating tip — the server worked the whole table. If the kitchen sent out a comped dessert, tip on it as if you'd ordered it. The total cost of hosting a birthday dinner for one is the full per-person share for two: theirs and your top-up to cover them.
Bad service on a big party
Large parties are a server's worst-case-scenario shift: separate checks, kids, allergy modifications, a slow kitchen, and a tip that's already locked in at the auto-grat rate. If the service was genuinely bad, the move is to talk to the manager — not to fight the auto-grat. Most managers will negotiate the auto-grat down to 15% or remove it entirely for a real complaint, but the conversation has to happen at the table or before the card runs. A bad Yelp review the next morning doesn't get money back to anyone, including the next big party that walks in.
Cash vs. card top-up
If you want to add to the auto-grat, do it in cash, handed to the server. The auto-grat is a service charge that the restaurant routes through payroll; a card top-up usually rides the same rail and is processed the same way. A cash top-up handed to the server is pocketed under house tip-out rules — bussers and runners take their share — and the server gets the rest end-of-shift, untaxed at the point of transaction.
What changes the answer
Push the effective tip up if…
- Your party kept the table past the kitchen's last seating.
- The server handled split checks for 6+ without complaint.
- Someone in the party had an allergy and the kitchen made substitutions.
- The server brought out a birthday dessert or candle without being asked.
The auto-grat is the right number when…
- Service was attentive and the kitchen kept pace.
- The party arrived close to on time and ordered without major modifications.
- The check came out promptly when asked.
Mini calculator — pre-filled at 20%
Type the bill, drag the percentage, set the party size. Defaults to 20% — the typical US auto-grat rate. For uneven orders, use the share-split math in Example 2 above.
Need a blank slate? The homepage calculator opens with no preset. For sit-down tipping outside of large parties, see the restaurant page.
FAQ
When does auto-gratuity kick in?
Most US restaurants apply 18–20% auto-gratuity for parties of six or more. The threshold drops to four in parts of Las Vegas and rises to eight at some Southern chains. The menu must disclose it.
How do I split a bill when people ordered unevenly?
Use a share-based split: each person pays for what they ordered plus a proportional share of tax and tip. Even split is faster; share split is fairer when one person had a salad and another had steak — see Example 2 above for the math.
Should I tip on top of an auto-gratuity?
You do not have to. The 18–20% auto-grat is the tip. Add cash on top only for exceptional service or a difficult party — 2–4% effective is the modern thank-you.