CIS calculator
LivePer-invoice CIS deduction calculator for UK construction subcontractors. Labour, materials and status in, net pay out in seconds.
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Syntorak Tools
Free browser-based tools for UK tradespeople.
No signup, no email, no tracking beyond a privacy-friendly page count. Built for plumbers, heating engineers, electricians, builders and roofers, especially anyone quoting jobs, sending invoices or working under CIS in the UK.
Quote generator
LivePrintable quotes for trade jobs. Type your business once, add customer + line items per job, hit print, save as PDF.
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Invoice generator
LiveFree UK invoice maker for trades jobs. Add customer, line items, VAT, due date and bank details, then print or save as PDF.
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CIS rebate calculator
PlannedPlanned annual rebate estimator for UK subcontractors. See what affects a CIS tax refund and what the calculator will cover.
Read what is planned →
Why these tools exist
Small practical tools for the admin around trade work.
Most trades businesses do not need another account to manage. They need quick, reliable tools that answer the thing in front of them: how much CIS comes off this invoice, how to send a clean quote or how to create an invoice the customer can pay.
Syntorak Tools is built around those jobs. The tools run in your browser, use plain UK wording and link back to the website offers for heating engineers and plumbers when you need the marketing side sorted as well.
Planned next
CIS rebate calculator.
A year-end estimator for subcontractors who have had CIS deducted through the year and want to understand whether a refund may be due after expenses and self-assessment.
View the planned calculator →Gross income
Total CIS income across the tax year.
CIS deducted
What contractors have already withheld.
Expenses
Tools, van costs, materials and other allowable costs.
Estimated refund
A simple guide to possible overpaid tax.
FAQ
Common questions about Syntorak Tools
Are the Syntorak tools free?
Yes. The tools are free to use in your browser. There is no signup, no email gate and no account needed.
Do you store my quote or invoice details?
No. Quote and invoice details are saved locally in your own browser so they are still there if you come back on the same device. They are not sent to Syntorak.
Which trades are these tools for?
They are built for UK tradespeople and construction subcontractors, including plumbers, heating engineers, electricians, builders, roofers and similar small trade businesses.
Can I save quotes and invoices as PDFs?
Yes. The quote and invoice generators use your browser's print dialog. Choose Save as PDF to download a clean PDF, or send it to a printer.
Is the CIS calculator tax advice?
No. It is a practical estimator for common CIS invoice deductions. Check HMRC guidance or speak to an accountant for your exact situation.
What tools are planned next?
The next planned tools are a CIS rebate calculator and a VAT reverse-charge calculator for construction work. They will sit alongside the CIS calculator, quote generator and invoice generator.
Built by Syntorak
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