Examples
Examples
Try the starting example
- Tax-inclusive gross amount ($)
- 120
- Entered tax rate (%)
- 20
- Net amount after exact-cent split ($)
- $100.00
- Included tax, half-up to US cents ($)
- $20.00
- Gross reconciliation difference ($)
- $0.00
Try another scenario
- Tax-inclusive gross amount ($)
- 100
- Entered tax rate (%)
- 25
- Net amount after exact-cent split ($)
- $80.00
- Included tax, half-up to US cents ($)
- $20.00
- Gross reconciliation difference ($)
- $0.00
Calculation method
Calculation method
Net amount after exact-cent split ($)
Net=gross−rounded included tax, preserving the gross total exactly.
Included tax, half-up to US cents ($)
Tax=gross×rate/(100+rate), rounded to US cents half-up.
Gross reconciliation difference ($)
Gross−net−tax, exactly zero in cent arithmetic.
Symbols and units
- a
- Tax-inclusive gross amount ($)
- b
- Entered tax rate (%)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- One inclusive amount at a supplied non-negative rate, with half-up cent rounding. It does not select a tax rate, establish taxability or assert that this rounding method is permitted for a particular invoice.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
HMRC: tax fractions, invoice rounding and credit-note background; rules vary ↗
Background reading; this does not imply endorsement or independent review of SumFizz.