Fix a problem
The tax or totals look wrong
The math is the same every time. When a total surprises you, one setting is usually doing something you did not expect.
- Applies to: Invoice generator
- Type: Troubleshooting
- Updated 4 November 2026
- The invoice open
- The tax rate you meant to charge
Try this, in order
- Open Extras and look at Prices include tax under Discount and tax.
- Check each line’s Tax cell. Tax is set per line, so a line left at 0% adds no tax.
- Check the Disc column. Discounts come off before tax is worked out.
- Compare your numbers with the example below.
Subtotal, Discount, Tax and Total add up exactly as printed.
Worked example
Take one line at $110.00 with a 10% tax rate. With Prices include tax off, the invoice shows Subtotal $110.00, Tax $11.00 and Balance due $121.00. With it on, the $110.00 already contains the tax: Subtotal $100.00, Tax (included) $10.00, Balance due $110.00.
Rounding
Each line is rounded to whole cents before the totals are added, so the printed lines always add up to the printed total. A figure worked out on a calculator from the grand total can differ by a cent.
Common problems
The total did not change when I added tax.
Prices include tax is on, so the tax is taken out of the price rather than added. Switch it off if your rates are before tax.
I see several tax rows.
The lines carry different rates, and each rate gets its own row.
The tax column disappeared.
Under Extras, Show per-line tax hides the column but keeps the values.
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