Calculator methodology
Every Billoz tool shows its formula and keeps statutory values in one dated configuration source.
Rounding
Money results are rounded to two decimal places for display. Intermediate calculations use JavaScript numbers.
Effective dates
VAT, CIS, late-payment and mileage values are checked against linked official sources and display the checked date.
Privacy
Calculator values remain in the browser and are not placed in the URL or sent to analytics.
Limitations
Results are estimates. Eligibility, contracts, tax status and source records can change the correct treatment.