Free tools
The sums that usually end up on the back of an envelope or in a spreadsheet that nobody trusts. Every one of them runs the same code TaskMyJob uses on a real invoice. Nothing to sign up for.
- CIS calculatorWhat a contractor will deduct from your invoice, and what reaches your bank.
- Markup and margin calculatorThe same job, two percentages — and pricing with the wrong one costs you on every invoice.
- Late payment interest calculatorWhat you can legally claim when another business pays late: interest, plus a fixed sum.
- Retention calculatorWhat a retention leaves you, what is owed today, and when the rest falls due.
- VAT reverse charge checkerWhether to charge VAT on a construction invoice, and the wording HMRC wants when you do not.
- VAT calculatorAdd VAT or take it back off — and why taking it off is not taking 20% off.
- Deposit and payment schedule calculatorSplit a job into payments the customer can follow, with nothing lost to rounding.
- Mileage claim calculatorWhat your business miles are worth at 45p and 25p, with the band in the right place.
- Hourly rate calculatorWhat to charge an hour once the unbilled hours, the weeks off and the van are in it.
- Day rate calculatorWhat to invoice for a week on site, per man per day, with part days rounded properly.
Why these run on the real thing
Each calculator imports the same tested module that prices a real invoice in TaskMyJob. A calculator with its own copy of the arithmetic drifts from the product within a month, and then a page saying “this is what we do” is quietly lying. There are free guides and videos covering the rest of it.