Large Party Automatic Gratuity Budget Guide
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The core formula
Auto-gratuity is a mandatory tip the restaurant adds to large-party checks (usually 6 or 8+ diners). It’s calculated as a flat percentage of the pre-tax subtotal, then taxed and totaled like any other charge.
Formula: Auto-Grat = Subtotal × Auto-Grat Rate | Final = Subtotal + Auto-Grat + Sales Tax
Common auto-grat rates range from 18% to 20%. Some restaurants apply it to the pre-tax subtotal, some to the post-tax total — the menu or server should tell you, but ask if it’s not on the receipt.
Step-by-step: budgeting for a large-party dinner
- Confirm the party size threshold (often 6 or 8+).
- Ask the restaurant’s auto-grat rate when you book.
- Tally the estimated subtotal for the group.
- Multiply by the auto-grat rate (say 18%).
- Add sales tax for your city.
- That’s your minimum total — extra cash tips are optional.
Let’s run a quick estimate. Eight people, $45 each food + drinks = $360 subtotal. 18% auto-grat = $64.80. Sales tax (say 8.5%) = $30.60. Grand total: about $455, or $57 per person minimum.
Honestly, the surprise factor is what kills budgets. A friend booked a 10-person birthday at a steakhouse and didn’t realize auto-grat was 20% — the $800 check jumped to over $1,040 with tax. She scrambled to cover it. Asking ahead fixes this entirely.
So what does that mean for you? Build the auto-grat into the per-person estimate before you RSVP. The bill tip tax splitter handles large-party splits with the gratuity line included, and pairing it with the monthly budget planner keeps the dinner from wrecking the rest of your month. For promo-coded restaurant bills, the discount and sales tax calculator clarifies what’s taxed.
2026 real case: the reunion dinner
Ten cousins at a Vietnamese spot in San Jose (California, 9.375% sales tax, 18% auto-grat for parties of 6+). Subtotal $485.
- Auto-grat: $485 × 0.18 = $87.30
- Sales tax on subtotal: $485 × 0.09375 = $45.47
- (Tax on the gratuity itself varies by state — California taxes it; many states don’t.)
- Estimated total: $485 + $87.30 + $45.47 = $617.77
- Per person (10): $61.78
If the restaurant taxes the auto-grat too: $87.30 × 0.09375 = $8.18 extra → $625.95 total → $62.60 per person. Small difference, but worth knowing.
| Party Size | Subtotal (est.) | 18% Auto-Grat | 8.5% Tax | Per-Person Total |
|---|---|---|---|---|
| 6 | $240 | $43.20 | $20.40 | $50.60 |
| 8 | $360 | $64.80 | $30.60 | $56.93 |
| 10 | $485 | $87.30 | $41.23 | $61.45 |
| 12 | $600 | $108.00 | $51.00 | $63.25 |
For the underlying tip math, our standard 15/18/20% tip formula explainer breaks it down, and the restaurant bill split with tip and tax piece covers the per-person split when auto-grat is involved.
Where do people mess this up? Double-tipping. The auto-grat IS the tip — you don’t add another 18% on top. An extra $10-20 cash for stellar service is fine, but stacking a full second tip on an already-large bill is just throwing money away.
Auto-grat vs voluntary tip
| Feature | Auto-Gratuity | Voluntary Tip |
|---|---|---|
| Who sets it | Restaurant (menu-stated) | Customer |
| Party size | Usually 6 or 8+ | Any |
| Rate | 18-20% typical | Customer choice |
| On receipt | Listed as a charge | Blank tip line |
| Taxable | Varies by state | Not taxed to customer |
Frequently Asked Questions
Can I refuse the automatic gratuity?
Generally no — it’s a stated restaurant policy you agree to by booking a large party. If service was genuinely terrible, talk to the manager; they can sometimes adjust it, but it’s at their discretion and not guaranteed.
Is auto-gratuity taxed differently than a regular tip?
For the customer, no — sales tax applies to the food either way. For the restaurant’s accounting, auto-grat may be classified as a service charge (taxable) rather than a tip. That’s a backend issue, not yours to worry about.
Should I add an extra tip on top of auto-grat?
Not required. An extra $5-20 cash for exceptional service is appreciated, but don’t stack a full second percentage tip on the bill — that’s paying the tip twice.
Does auto-grat apply to takeout or delivery orders?
Rarely for takeout. Some caterers and large delivery orders add a service fee that functions like auto-grat — check the invoice before assuming the delivery driver is tipped, and ask if it’s not clear.
The bottom line
Auto-grat is the tip — budget for it, don’t double it. The bill tip tax splitter shows the full per-person breakdown so your reunion doesn’t end in awkward math.