18 free tools. One question each. Answered in under a minute.
Checkers, calculators, builders and decoders for UK tattoo artists. No signup. No paywall. Open the one you need, get an answer, get on with your day.
Every tool here is built around a single question a UK tattooist actually asks: "is this ink REACH-compliant?", "what should I charge per session?", "what does this HMRC letter mean?". Each one cites the rule or law it's based on. None of them need you to create an account.
Calculators
Plug in your numbers. Get a clear answer. Every calculator is based on the actual UK rules in force, not guesswork.
Tax Set-Aside Calculator
Enter your tattoo earnings and find out exactly how much to put aside each week or month for income tax and National Insurance. Built for self-employed artists, custom or flash.
Monthly Profit Tracker
Track your monthly income and expenses to see a running profit total and estimated tax liability for the current tax year. All data stays on your device.
Holiday Pay Calculator
Work out your statutory holiday entitlement and what it's worth in pounds. Covers full-time, part-time, irregular hours, and the 'your day rate includes holiday' question that catches everyone out.
Notice Period Calculator
Enter your length of service and contract terms to find out your legal minimum notice period under the Employment Rights Act 1996.
Hourly + Piece Rate Calculator
Enter your costs, target take-home pay, and whether you charge hourly or per-piece. This tells you the minimum rate you need to charge to make a living after tax.
Late Payment Calculator
A client owes you for a finished piece and won't pay? This calculates exactly what they owe you under the Late Payment Act, statutory interest at 8% above base rate plus fixed compensation.
Studio Setup Cost Estimator
Costing out opening or fitting a studio? Plug in your borough, footprint and equipment tier and get a realistic UK setup-cost range from fixtures through to first-quarter insurance.
Chair Rental Calculator
Work out a fair chair rental either side of the deal: take-home for the artist, margin for the studio, and what 50/50 vs flat-rent actually looks like in pounds per month.
Checkers
Answer a few questions. Find out where you stand. Every checker is built on the actual regulations, not opinions.
Tax Code Checker
Type in your PAYE tax code and get a plain-English explanation of every part, including red-flag codes like BR, 0T and W1/M1.
HMRC Letter Decoder
Got a letter from HMRC and don't know what it means? Search by reference and get a plain-English explanation, urgency rating, and step-by-step instructions.
Expense Checker
Pick an expense (inks, machines, PPE, studio rent, phone) and find out if it's claimable, partially claimable, or not allowed. Stop giving HMRC money you don't owe them.
Employment Status Checker
Your contract says self-employed and the studio treats you as self-employed, but what would a tribunal say? Tattoo-specific HMRC-based questions that tell you what the law actually sees.
NMW Pay Checker
If you're an apprentice or junior on a weekly wage, check whether your pay clears the National Minimum Wage. Includes 2025-26 and 2026-27 rates.
Small Claims Check
Someone owes you money and won't pay. Is small claims court the right move? Enter the amount and situation and this tells you the court fee, the likely timeline, and whether it's worth the hassle.
Quarterly Business MOT
A quarterly checklist covering council registration renewal, insurance, autoclave servicing, Hep B boosters, REACH compliance and admin. Track expiry dates and get a health score.
Ink Ingredient Checker
Paste an ink ingredient list and find out which substances are restricted under UK REACH Annex 17 (decided 30 December 2025) and what to switch to.
Finders
Not sure which registration, licence or scheme applies to you? These find the answer for you.
Guides
Short reference guides you can come back to month after month.
Built for your phone, not a desktop
Every tool works on mobile. Use them at the studio, between clients, on the bus, wherever you need the answer. No app to download. No account to create. Just open the link and use it.
No data collected
We don't store your inputs, track your usage, or sell your information. The calculations happen in your browser and stay there. When you close the tab, it's gone.
Missing a tool you'd find useful?
Email us at hello@kilnguides.co.uk with what you need. If enough artists ask, we'll build it.
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