Free tools
The sums UK construction keeps getting wrong
Free and ungated, with no email address to give. The calculators run in your browser, send nothing to a server and store nothing, and each applies the same arithmetic Estimark uses in the product. The compliance calendar puts every recurring statutory date beside the regulation that sets it. All of them say plainly what they cannot answer.
CIS deduction calculator
Work out the deduction on a payment, on labour only, at the right rate, in the right tax month.
Open Free toolPayment dates and Pay Less deadline
Due date, payment notice deadline, final date for payment and the Pay Less Notice cut-off, from one application date.
Open Free toolVAT reverse charge checker
Six questions from VAT Notice 735, and the answer names the condition that decided it rather than only saying yes or no.
Open Free toolRetention calculator
What is held on a valuation, what the cap does to it, and the two dates the money comes back.
Open Free toolMarkup vs margin calculator
Convert between the two, and see what price a target actually needs. Adding 20% to cost is a 16.7% margin.
Open Free toolSoftware spend calculator
Add up what you pay a month for HR, clocking in, job management, estimating and safety software, and see it beside the Estimark plan that seats the same people.
Open Free referenceCompliance calendar
Every recurring statutory date a UK contractor works to, with the instrument that sets it: CIS, VAT, gas, EICR, scaffolds, F10, RIDDOR and Awaab’s Law.
Open Free weekly emailPublic tenders
Every Monday, the public sector construction notices published in the last seven days for the trades and regions you choose, with the buyer, the value, the closing date and a link to each.
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