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Tip + Sales Tax + Currency Conversion + Discount Stacking Final Price Waterfall Calculator

· Last updated：2026-09-23

Builds the true final price as a waterfall: stacked discounts, correct sales-tax base and cascade, tipping on the etiquette base with rounding, per-person split, and mid-market vs DCC conversion.

Details

What this tool helps you do

Defaults follow documented rules: US sales tax is generally charged after store discounts but on the full price for manufacturer-reimbursed coupons; BOGO free items are usually treated as discounts of the paid item; tips are customarily computed on the pre-tax subtotal; DCC terminal offers typically load 3–7% over the interbank mid-market rate while card issuers charge ~1–2% on home-currency billing. Per-line tax amounts are rounded to cents like a POS.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Calculator
Input types
number, textarea, select, text
Output type
html
Sample coverage
4
API ready
Yes

Overview

The Tip, Sales Tax, Currency Conversion, and Discount Stacking Calculator computes your true final checkout cost through a transparent price waterfall. It accurately handles sequential or additive discount stacking, pre- and post-discount sales tax bases, multi-jurisdiction tax cascading, custom tip rules with standard etiquette bases, per-person split billing, and dynamic currency conversion (DCC) markup versus mid-market foreign exchange rates.

When to use

  • Splitting a restaurant or bar tab abroad while accounting for stacked promotions, local sales taxes, pre-tax tipping etiquette, and multi-person bill splits.
  • Evaluating international e-commerce orders with manufacturer or store coupons, multi-tier tax cascades (such as GST, PST, or HST), and cross-currency settlement fees.
  • Deciding between payment in local currency or accepting POS dynamic currency conversion (DCC) markups when traveling internationally.

How it works

  1. 1Enter your starting list price subtotal and specify percentage or fixed discounts stacked sequentially or additively.
  2. 2Select the applicable sales tax base (pre-discount for manufacturer coupons or post-discount for store coupons) and enter multi-jurisdiction tax rates with additive or compound cascading.
  3. 3Set tip percentage, target tipping base (such as pre-tax post-discount), and rounding rules, then assign the party size to split the local total.
  4. 4Input exchange rate settings, card issuer foreign transaction fees, and terminal DCC markups to compare foreign vs. home currency card settlement costs.

Use cases

  • Dining Bill Splits: Calculate exact per-person costs for group restaurant meals including stacked coupons, city/state sales tax, and rounded tips.
  • Overseas Shopping & Travel: Compare payment terminal DCC rates against credit card foreign exchange fees to choose the cheapest currency payment option.
  • Cross-Border Online Retail: Model total landed checkout totals for global orders involving regional VAT/GST cascades and stacked promo codes.

Examples

1. US Dining Bill with Promo and Card DCC Evaluation

International Traveler

Background

Dining at a US restaurant with a promotional voucher, split between two people and paying with a foreign credit card.

Problem

Needs to apply a 20% coupon, add local sales taxes, tip 20% on the pre-tax etiquette base, split the total, and check if accepting the terminal DCC conversion is worth it.

How to use

Set subtotal to 85.00, discount line to 20%, tax base to after-discounts, tax lines to State=6.5 and City=0.5, tip to 20% on pre-tax post-discount, party size to 2, and enter FX parameters (7.25 CNY/USD, 3.5% DCC markup, 1% issuer fee).

Outcome

Generates a waterfall showing an 86.36 USD grand total (43.18 USD per person), yielding 626.11 CNY via card issuer rate versus a 21.91 CNY DCC terminal surcharge.

2. Cross-Border Purchase with Compound Tax and Stacked Coupons

E-commerce Shopper

Background

Ordering goods from a Canadian merchant using both a percentage manufacturer coupon and a fixed store discount code.

Problem

Wants to verify checkout totals where taxes compound (GST + QST) over a manufacturer coupon base and convert EUR costs to GBP.

How to use

FAQ

What is the difference between store discounts and manufacturer coupons for sales tax?

Store discounts reduce the taxable base before sales tax is applied, whereas manufacturer coupons are usually taxed on the original list price because the retailer is reimbursed for the coupon value.

Should tips be calculated on the pre-tax or post-tax amount?

Standard dining etiquette calculates tips on the pre-tax, post-discount subtotal so you only tip on the value of the food and service received.

What is the difference between sequential and additive discount stacking?

Additive stacking sums all percentage discounts against the original list price, while sequential stacking applies each subsequent discount to the remaining subtotal.

What is Dynamic Currency Conversion (DCC)?

DCC is a card terminal service that converts your bill into your home currency at checkout, usually adding a 3% to 7% markup over mid-market rates.

How does compound tax cascading work?

In compound taxation, secondary taxes apply to the combined sum of the subtotal and preceding taxes, rather than applying all tax percentages to the base subtotal in parallel.

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Enter 249.99 EUR subtotal, sequential discounts of 15% and 20.00, pre-discount tax base, compound tax lines for GST=5 and QST=9.975, tip to 0, and FX rate of 0.85 GBP/EUR with 5% DCC vs 2% issuer fee.

Outcome

Outputs a detailed itemized waterfall showing a discounted base of 192.49 EUR, 38.68 EUR in compound taxes, and proves home card billing saves money over terminal DCC.