Tax and Tip Calculator
Tip on the subtotal before sales tax. That is the etiquette standard and it is what most servers expect — but the card terminal does not do it that way, and the gap is bigger than most people realise.
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Enter the subtotal from your receipt, before tax, to follow the standard convention. Enter the post-tax total instead if you would rather tip on the full amount.
Do You Tip Before or After Tax?
Before tax. The convention in the United States is to tip on the subtotal, and the Emily Post Institute — the standard reference for American etiquette — puts restaurant tipping at 15 to 20% of the pre-tax bill.
The reasoning is straightforward: sales tax is money the restaurant collects on behalf of the state. Your server had nothing to do with it, so it has never conventionally formed part of the tip base.
In practice the difference is small enough that plenty of people do not bother, and tipping on the total is perfectly acceptable. What is worth knowing is that the card terminal has already made the choice for you — and not in the direction you might assume.
What the Terminal's Button Really Charges You
When a payment screen offers 18%, 20% and 25%, it is almost always calculating those figures from the post-tax total, because that is the amount the transaction is for. The terminal has no reason to know what the subtotal was.
That means the percentage you press is not the percentage you leave. Multiply the button by one plus your local tax rate and you get the effective figure against the subtotal.
| What you press | 0% tax | 6% | 8% | 8.875% | 10.25% |
|---|---|---|---|---|---|
| 15% button | 15.0% | 15.9% | 16.2% | 16.3% | 16.5% |
| 18% button | 18.0% | 19.1% | 19.4% | 19.6% | 19.8% |
| 20% button | 20.0% | 21.2% | 21.6% | 21.8% | 22.1% |
| 25% button | 25.0% | 26.5% | 27.0% | 27.2% | 27.6% |
So in New York City, the 20% button is really 21.8% of the subtotal, and the 25% button is 27.2%. None of that is deceptive — the terminal is doing arithmetic on the number it has. It is simply worth knowing before you decide the 18% option looks stingy.
What the Difference Actually Costs
The gap between a pre-tax and post-tax tip is the tip percentage multiplied by the tax rate. At a 20% tip and 8% sales tax, that is an extra 1.6% of the subtotal.
On a normal dinner this is not worth a moment's thought. On a large group bill it starts to matter.
| Subtotal | Tax at 8% | 20% pre-tax | 20% post-tax | Difference |
|---|---|---|---|---|
| $50 | $4.00 | $10.00 | $10.80 | $0.80 |
| $100 | $8.00 | $20.00 | $21.60 | $1.60 |
| $200 | $16.00 | $40.00 | $43.20 | $3.20 |
| $400 | $32.00 | $80.00 | $86.40 | $6.40 |
| $600 | $48.00 | $120.00 | $129.60 | $9.60 |
Neither column is wrong. The pre-tax figure is the convention; the post-tax figure is what the terminal will suggest, and it is a slightly more generous tip rather than an error.
Sales Tax on Restaurant Meals Varies a Lot
How much any of this matters depends entirely on where you are eating. Combined state and local sales tax on restaurant meals ranges from nothing at all to over 10%, and several cities add a separate meals or restaurant tax on top of the general rate.
Four states have no general sales tax: Oregon, Montana, New Hampshire and Delaware. In those places the question does not arise — the subtotal and the total are the same number. Alaska has no state sales tax but some localities levy their own.
At the other end, Chicago and parts of California, Louisiana and Washington sit above 10% once local add-ons are counted. That is where the pre-tax habit is worth keeping.
The Double-the-Tax Shortcut, and When It Fails
There is a mental-arithmetic trick that works well in states where combined sales tax lands around 8 to 10%: double the tax line on your receipt and you are close to a 16 to 20% tip.
In New York City, where the combined rate is 8.875%, doubling the tax gives 17.75% — a perfectly respectable tip, reached in one step.
The trick fails completely where tax is low or absent. In Oregon there is no tax line to double. In a state at 4% you would be tipping 8%, which is well below the American range. Check the rate before relying on it.
The Buffet Exception
One detail that gets lost: the etiquette standard is not a single number across all restaurant formats. The Emily Post Institute puts buffet service at around 10% of the pre-tax bill rather than 15 to 20%.
The logic is the amount of service involved. At a buffet the staff clear plates, refill drinks and reset the table but do not take orders or run food, so the customary figure sits lower.
The same reasoning explains why counter service — where you order at a till and carry your own tray — carries no established expectation at all.
Service Charges Are Neither Tax nor Tip
A growing number of restaurants add percentage-based line items that are neither: a kitchen appreciation fee, a wellness or healthcare surcharge, or a flat service charge replacing tipping altogether.
These are business revenue. Unlike a tip, the restaurant decides where the money goes, and unlike tax it is not collected for the government. They should be disclosed on the menu before you order.
If a restaurant has adopted a service-included model and says so clearly, an additional tip is genuinely optional — that is the entire point. If it has simply added a 5% surcharge alongside a normal tip line, your server is probably not receiving it, and tipping normally on the subtotal remains the right move. Gratuity and service charges covers the distinction, including the IRS test that separates them.
How to Read a US Restaurant Receipt
Everything above comes down to reading four lines in the right order before you write anything on the tip line.
In order, from the bottom of the bill:
- Subtotal — the line before tax, and the correct tip base.
- Sales tax — collected for the state, not part of the tip.
- Service charge or automatic gratuity — if this is present, that is the tip. Do not add a second one.
- Other fees — kitchen, wellness, or credit-card surcharges are business revenue, not tips to staff.
- The suggested percentages — set by the business, calculated post-tax, and entirely optional.
Pre-Tax Versus Post-Tax Tip
A 20% tip on a $100 subtotal, calculated both ways, at the sales tax rates you are most likely to meet.
| Sales tax rate | Tax on $100 | Tip pre-tax | Tip post-tax | Difference |
|---|---|---|---|---|
| 0% (Oregon, Montana, New Hampshire, Delaware) | $0.00 | $20.00 | $20.00 | $0.00 |
| 4% | $4.00 | $20.00 | $20.80 | $0.80 |
| 6% | $6.00 | $20.00 | $21.20 | $1.20 |
| 7% | $7.00 | $20.00 | $21.40 | $1.40 |
| 8% | $8.00 | $20.00 | $21.60 | $1.60 |
| 8.875% (New York City) | $8.88 | $20.00 | $21.78 | $1.78 |
| 10.25% (Chicago area) | $10.25 | $20.00 | $22.05 | $2.05 |
Rates shown are combined state and local figures and change regularly. Several cities apply an additional restaurant or meals tax on top of the general sales tax rate — check your own receipt rather than assuming.
Sources
- The Emily Post Institute, General Tipping Guide
- U.S. Department of Labor, Fact Sheet #15: Tipped Employees Under the FLSA
Sales tax rates are combined state and local figures that change regularly and are given as illustrative examples rather than a current tax table. Check your own receipt. This page is general information, not tax advice, and is current as of August 2026.
Frequently Asked Questions
Do you tip before or after tax?
Before tax. The Emily Post Institute puts restaurant tipping at 15 to 20% of the pre-tax bill, on the reasoning that sales tax is collected for the state and has nothing to do with the service.
Is it wrong to tip on the post-tax total?
No. It is slightly more generous and completely normal. Card terminals calculate their suggestions that way by default, so most people who use the buttons are already doing it.
How much difference does tipping after tax make?
The tip percentage multiplied by the tax rate. At a 20% tip and 8% sales tax, it is an extra $1.60 on a $100 subtotal, or $6.40 on $400.
Do card machines calculate the tip on the total including tax?
Almost always. The terminal only knows the transaction amount, so a 20% button is really 21.6% of the subtotal at an 8% tax rate, and 21.8% in New York City.
Does doubling the tax give a good tip?
In states where combined sales tax is 8 to 10%, doubling the tax gives roughly a 16 to 20% tip. It fails in low-tax and no-tax states — in Oregon there is no tax line to double.
How much do you tip at a buffet?
Around 10% of the pre-tax bill rather than 15 to 20%, because staff clear plates and refill drinks but do not take orders or run food.
Do you tip on a service charge?
No. A service charge is business revenue rather than a tip, and adding a full tip on top means paying twice for the same thing.
Which states have no sales tax on restaurant meals?
Oregon, Montana, New Hampshire and Delaware have no general sales tax. Alaska has no state sales tax but some localities levy their own.
What is the correct tip base on a US receipt?
The subtotal — the line above sales tax. Check below it for any service charge or automatic gratuity, because if one is present you have already tipped.
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