Should I tip on the pre-tax or post-tax bill amount?

Etiquette guides recommend the pre-tax subtotal. On $120 plus $9.60 tax, 20% on $129.60 costs $1.92 more than 20% on $120. The gap grows with higher tax rates and frequent dining.

What are auto-gratuity policies at restaurants?

Many venues add 18–20% for parties of six or more. That charge may be a service fee rather than a voluntary tip under IRS rules if the customer cannot adjust it. Read the receipt before stacking another full percentage on top.

How should I handle tipping on comped or discounted items?

Tip on the menu price of comped items when you can estimate it — the server still delivered the meal. If management removes an item for a kitchen error, calculate gratuity as if the item were still billed.

Tip scenario

Restaurant Dinner Tip Calculator

Calculate tip on a $120 dinner at 20%. Toast averaged 19.1% at full-service restaurants in Q2 2026 — see split-check totals.

Full-service restaurant tips averaged 19.1% on Toast card transactions in Q2 2026 — close to the 18–20% etiquette range. Federal law still allows a $2.13 per hour direct cash wage when tips bring workers to the $7.25 minimum, so gratuities remain core server income. On a $120 pre-tax dinner, 20% is $24 (total $144, or $72 per person for two).

Bill Amount

Pre-tax bill amount before tip

Tip Percentage

Select a preset or enter a custom percentage

Number of People

Split the total bill and tip evenly

Tip Amount

$24.00

20% of $120.00

Total Amount

$144.00

Bill + tip

Per Person

$72.00

$12.00 tip each

Tip Reference for $120.00 Bill

Tip %	Tip Amount	Total
15%	$18.00	$138.00
18%	$21.60	$141.60
20%	$24.00	$144.00
22%	$26.40	$146.40
25%	$30.00	$150.00

Key Considerations

On $120 pre-tax: 15% is $18.00, 18% is $21.60, 20% is $24.00, and 25% is $30.00 — a $12 spread between adequate and generous.
Tip on the pre-tax subtotal. With 8% sales tax ($9.60), tipping 20% on $129.60 after tax adds $1.92 versus tipping on $120.
Mandatory service charges on large parties are not voluntary tips for IRS qualified-tip rules unless the customer can change the charge — check the receipt before adding extra.
Bankrate's 2025 survey found 70% of sit-down diners always tip servers, while 35% typically leave at least 20%.
Split checks by each diner's food plus proportional tax, then apply the tip percentage to each share.

Quick Numbers

Tip at 15%	$18.00
Tip at 18%	$21.60
Tip at 20%	$24.00
Tip at 25%	$30.00
Per-person total at 20%	$72.00 ($144 ÷ 2)
Pre-tax vs post-tax tip difference	$1.92 extra at 20% on after-tax total

How This Compares

Full-service dining targets 18–20% because of the tipped minimum wage structure and longer service time. Toast's Q2 2026 average of 19.1% at full-service restaurants sits between those marks. Delivery and counter service norms run lower in percentage terms on small tickets but still matter for worker pay.

Frequently Asked Questions

Should I tip on the pre-tax or post-tax bill amount?: Etiquette guides recommend the pre-tax subtotal. On $120 plus $9.60 tax, 20% on $129.60 costs $1.92 more than 20% on $120. The gap grows with higher tax rates and frequent dining.
What are auto-gratuity policies at restaurants?: Many venues add 18–20% for parties of six or more. That charge may be a service fee rather than a voluntary tip under IRS rules if the customer cannot adjust it. Read the receipt before stacking another full percentage on top.
How should I handle tipping on comped or discounted items?: Tip on the menu price of comped items when you can estimate it — the server still delivered the meal. If management removes an item for a kitchen error, calculate gratuity as if the item were still billed.

Sources U.S. DOL Fact Sheet #15 — federal tipped minimum cash wage $2.13 (2026), Toast restaurant tipping data — Q2 2026 U.S. averages, Bankrate Tipping Survey (June 4, 2025). Checked October 2026.