PRIVATE, BROWSER-ONLY WORKSHEET · Calculators
Shared Tax and Tip Allocation Audit
Split one bill’s tax and tip in proportion to each person’s pre-tax subtotal, with exact cent reconciliation and a downloadable allocation table.
Alex has 24.00 and Bo has 16.00 in items. With 4.00 tax and 8.00 tip, their totals are 31.20 and 20.80; together they equal 52.00.
Set up the calculation
Enter your own values or load the worked example. Your entries stay in this browser.
Your result
Full bill total
UNDERSTAND THE RESULT
How to use the Shared Tax and Tip Allocation Audit
Use this after a group meal when people ordered different amounts but agreed to share the bill’s tax and tip proportionally. The audit table keeps the arithmetic visible for each person.
What to enter
Give each person one unique name and pre-tax subtotal. Add the bill’s tax and tip as amounts, not rates. If a person ordered tax-exempt items, calculate that exception separately before using this simple model.
Worked example
Alex has 24.00 and Bo has 16.00 in items. With 4.00 tax and 8.00 tip, their totals are 31.20 and 20.80; together they equal 52.00.
How to read the result
The final column is each person’s subtotal plus allocated charges. Add all final-column amounts to check the full bill; the cent allocation ensures they reconcile exactly.
Method
Add the entered subtotals, divide each subtotal by that total, and allocate combined tax and tip by those proportions. Whole cents are assigned with the largest-remainder method so every share adds back to the bill.
What to check
This assumes all entered items have the same tax treatment and that a proportional tip is agreed. It does not infer local tax law, excluded items, or who actually paid.
Avoid this mistake
Dividing the tax and tip equally after dividing items by purchase amount changes the agreed proportional rule and can overcharge a smaller order.
Calculations run locally in your browser. No entered values are sent to the Nirmion API.
Questions to check
Why might two equal subtotals differ by one cent?
When a cent cannot be split evenly, the largest-remainder rule assigns it deterministically by row order. The total still reconciles.
Can I enter a tax percentage?
No. Enter the actual tax amount from the bill. This avoids claiming that every item has the same taxable rate.
Does this settle who pays whom?
No. It calculates amounts owed. Use the settlement worksheet when paid and owed balances are known.