Tip before or after tax? And does the discount come first?

There is no fixed rule. Etiquette guides commonly suggest tipping on the pre-tax amount, but tipping on the total including tax is also widely accepted, and the difference is small. When you use a coupon or voucher, tipping on the price before the discount is considered courteous, since the service was the same.

How much difference does it make?

With an 80.00 bill and 8% sales tax, the total is 86.40. A 20% tip is:

• On the pre-tax amount: 20% × 80.00 = 16.00
• On the total: 20% × 86.40 = 17.28

The gap is the tip rate times the tax: 20% × 6.40 = 1.28. With low sales taxes it is pocket change; where tax is higher, it grows proportionally. Customs vary by country and by type of service, so if you are travelling, check what is usual where you are.

The Tip Calculator works on whichever amount you enter, so type the subtotal for a pre-tax tip or the total for a post-tax one, then split it between the group.

Coupons, vouchers and discounts

If a 25% voucher brings an 80.00 meal down to 60.00, the server still served an 80.00 meal. Many people tip on the original 80.00 for that reason. Tipping on 60.00 at 20% gives 12.00; on 80.00, it gives 16.00. Either is your choice — just be aware which one you are calculating.

Does the order of discount and tax matter?

Percentage discounts: no

Multiplying is order-free. 25% off then 8% tax on 80.00: 80 × 0.75 × 1.08 = 64.80. Tax first then 25% off: 80 × 1.08 × 0.75 = 64.80. Same answer.

Fixed-amount discounts: yes

Take 10.00 off before tax: (80 − 10) × 1.08 = 75.60. Take 10.00 off after tax: 80 × 1.08 − 10 = 76.40. The second is 0.80 more, because tax was charged on the 10.00 you did not pay.

In most places, sales tax or VAT is charged on the price actually paid after a shop’s own discount. Some jurisdictions treat certain coupons, such as manufacturer coupons, differently, so if the receipt surprises you, check the local rule. The Discount Calculator can add a tax rate after the discount to show the price at the till, and the Tax Calculator separates tax from a total that already includes it.

Where prices already include tax

In the UK, the EU, Australia and many other countries, menu prices include VAT or GST, so the bill shows one figure and the question of tipping before or after tax never comes up. If you want to tip on the pre-tax amount anyway, divide by one plus the tax rate: a 60.00 bill including 20% VAT is 50.00 before tax. In practice, people in those countries tip on the total shown.

Service charges

If a service charge is already on the bill, it often serves the same purpose as a tip. Read the bill: some restaurants add a charge only for large groups, and whether it goes to staff varies. Adding a full tip on top of a service charge is optional, not expected by default.

Splitting fairly

• Agree first whether you are tipping on the subtotal or the total.
• Split the tip in the same proportion as the food if orders were very different; an equal split is simpler when they were similar.
• Rounding each share up for cash adds a little to the tip; that is usually welcome.

Mistakes to avoid

• Tipping on a total that already includes a service charge without noticing.
• Taking a fixed discount after tax when the shop applies it before.
• Splitting the subtotal evenly but forgetting to split the tax and tip.

Checklist

• Service charge already included?
• Tipping on subtotal, total or pre-voucher price — decided on purpose?
• Fixed discount applied before tax, as most shops do?