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How to split a bill with tip and tax

The fairest way to split a bill with tip and tax is proportionally: divide the total by the subtotal and multiply each person's order by that number. Splitting tax and tip equally is simpler, but it overcharges whoever ordered least.

Updated November 2026

Proportional or equal: what is the difference?

Tax is charged as a percentage of what was ordered. Tips are usually a percentage too. So the natural way to share them is the same way: in proportion to each person's order. That is a proportional split.

An equal split of tax and tip divides the extras evenly, no matter what each person ordered. It is simpler, but it means the person who ordered soup helps pay the tip on someone else's steak.

And then there is the fully equal split, where you divide the whole bill by the number of people. That is fine when everyone ordered about the same.

Worked example: dinner for four

Ana, Ben, Chloe and Dev go out for dinner. Before tax and tip:

• Ana: $42 (main, dessert and a cocktail)
• Ben: $28
• Chloe: $35
• Dev: $15 (one main, water)

The subtotal is $120. Tax is 8%, which is $9.60. They tip 20% on the pre-tax subtotal, which is $24. The total is $153.60.

Option 1: tax and tip in proportion

Tax and tip add $33.60 to a $120 subtotal. $153.60 ÷ $120 = 1.28, so everyone pays 1.28 times their own order.

Option 2: tax and tip split equally

The extras are $33.60. Split four ways, that is $8.40 each, added to each person's order.

Option 3: the whole bill split equally

$153.60 ÷ 4 = $38.40 each. Dev, who ordered $15 of food, would pay $38.40. Ana, who ordered $42, would pay less than her food cost with tax and tip.

Comparing the three

With proportional splitting, Dev pays $19.20. With equal extras, he pays $23.40. With a fully equal split, $38.40. The proportional method is the only one where everyone pays the same percentage on top of their own order, which is why it is the default for itemised bills.

Step by step: split a bill with tip and tax

1. Add up each person's items. Write down what each person ordered before tax and tip. Shared dishes get divided between the people who ate them.
2. Find the subtotal. Add up everyone's items. It should match the subtotal on the receipt.
3. Work out the multiplier. Divide the final total, including tax and tip, by the subtotal.
4. Multiply each person's items by it. That is what each person owes, including their fair share of tax and tip.
5. Check the total and round. The shares should add up to the bill. If rounding leaves a cent over, give it to one person.

The bill splitter does these steps for you in the browser.

What about shared dishes?

Divide a shared dish between the people who ate it, then add each part to their order before you apply the multiplier. If Ana and Ben shared a $12 starter, add $6 to each of their orders. Everything else stays the same.

Should you tip on the pre-tax or after-tax amount?

Etiquette varies by country and by person. Many people tip on the pre-tax amount, as in our example. It makes little difference to how you split it: whichever way you calculate the tip, the proportional method still shares it fairly. Where a service charge is already added to the bill, treat it exactly like a tip and do not tip twice unless you want to.

What about rounding?

Proportional splits often produce awkward cents. Rounding each share to the nearest cent can leave the total a cent or two off the bill. Fix it by adding or removing the stray cent from one person's share, usually whoever paid. If your group prefers whole numbers, round each share down and let the person who paid absorb the difference. It is rarely more than a few cents per person.

When an equal split is the right call

Proportional splitting is fairest, but it is not always worth the effort. If everyone ordered within a few dollars of each other, the difference between methods is small. If you eat out with the same friends every week, the differences tend to even out over time. And sometimes speed matters more than precision. Use a proportional split when orders vary a lot, when someone is not drinking, or when the bill is large.

Who paid, and who owes what

In our dinner, Ana put the whole $153.60 on her card. Using the proportional split:

A plus balance means the group owes you. A minus balance means you owe the group.

1. Ben pays Ana $35.84
2. Chloe pays Ana $44.80
3. Dev pays Ana $19.20

Ben, Chloe and Dev owe $99.84 between them, which is the bill minus Ana's own $53.76.

How SplitSimple handles tip and tax

When you add an expense in SplitSimple, choose the by-item split, add each dish, and tap the people who had it. Add the tip as a percentage or an exact amount, and the tax as an exact amount. SplitSimple spreads tax and tip across people in proportion to their items, the same way as Option 1 above. If the group would rather go simple, the equal split divides the whole bill evenly.

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