Tipping on a Discounted Bill: Before or After the Coupon?
Your server did the same work whether or not you had a voucher. That argument is real — and it is still not a rule, because no authority has ever published one.
You had a 2-for-1 voucher. The food was $80, the discount took $40 off, and the card machine is now suggesting 20% of $40. Do you tip on what you paid, or on what it would have cost?
The argument that carries weight
There is a genuine case for tipping on the pre-discount amount, and it is not complicated: your server did the same work either way. They carried the same plates and took the same order. The voucher was between you and the restaurant’s marketing department; the person at your table had nothing to do with it.
On the numbers above, that is the difference between leaving $8 and leaving $16 — on a discount you were given, not one they gave.
Why we still won’t call it a rule
Because we went looking for the authority behind it and could not find one.
The Emily Post Institute’s most recent published guidance on restaurant tipping, on Substack on 2 October 2025, says a “minimum 15 percent tip” — and nothing whatsoever about coupons, vouchers, comps or discounts. IRS Publication 531, read end to end, is likewise silent.
What the machine has already decided
Meanwhile the terminal in front of you has quietly taken a side. Card readers generally calculate their suggested tips on the discounted total — the amount actually being charged. That is the arithmetic the payment system needs to do, not a position on etiquette, but it becomes the default for most people because it is the number on the screen.
So the pre-discount tip is the one that requires you to notice and do something about it.
A way to decide that isn’t agonising
Ask what the discount was for. A voucher, a loyalty reward or a promotion is the restaurant buying your visit — the service was full price. A comp because your food arrived cold is different: something went wrong, and nobody expects you to tip as though it hadn’t.
Our discount calculator lets you set the discount and then choose which base the tip uses — before or after — and shows both figures. It takes no side, because there is no side to take. It just makes sure you know which one you are leaving.