GraftG tools

Free calculators for UK tradespeople — plus WhatsApp-powered admin tools.

Free calculators

No sign-up. No cost. Use them as many times as you like.

🧮 FREE TOOL
CIS deduction calculator — 20% and 30% rates
Calculate CIS deductions on labour for UK construction subcontractors. 20% registered, 30% unregistered, 0% gr…
 🧮 FREE TOOL
HMRC mileage calculator — 45p and 25p AMAP rates 2026/27
Calculate your HMRC mileage allowance for 2026/27. 45p per mile for the first 10,000 miles, 25p thereafter. Fr…
 🧮 FREE TOOL
VAT calculator — add or remove 20% VAT instantly
Add 20% VAT, remove VAT from a gross amount, or reverse-calculate the VAT element. Free UK VAT calculator for …
 🧮 FREE TOOL
Income tax calculator for UK self-employed
Calculate your income tax as a self-employed tradesperson. Personal allowance, 20%/40%/45% bands, plus Class 4…
 🧮 FREE TOOL
National Insurance calculator for self-employed
Calculate Class 4 National Insurance on your self-employed profits. 6% between £12,570–£50,270, 2% above. Free…
 🧮 FREE TOOL
Capital gains tax calculator UK 2026/27
Calculate UK capital gains tax on property, shares, or business assets. Annual exempt amount £3,000, rates 18%…
 🧮 FREE TOOL
Dividend tax calculator UK 2026/27
Calculate dividend tax for UK company directors. £500 allowance, then 8.75%/33.75%/39.35%. Free dividend tax c…
 🧮 FREE TOOL
Late payment interest calculator UK
Calculate statutory interest and compensation on overdue UK invoices under the Late Payment of Commercial Debt…
 🧮 FREE TOOL
Profit margin calculator — markup vs margin
Calculate profit margin and markup on trade jobs. Enter cost and selling price to see your margin percentage, …
 🧮 FREE TOOL
Hourly rate calculator — daily and annual conversions
Convert between hourly, daily, and annual rates. Set your hours per day and working days per year. Free calcul…
 🧮 FREE TOOL
CIS subcontractor calculator — multiple subbies on one job
Calculate CIS deductions for up to 6 subcontractors on one job. Mixed rates (20%, 30%, gross). See total deduc…

WhatsApp tools & guides

Features that come with your GraftG plan — from £14/month, first month free.

The WhatsApp mileage tracker for UK tradespeople
Text your miles, get HMRC totals. UK's simplest mileage logger — works on WhatsApp, calculates the 45p / 25p H…
WhatsApp receipt scanner — UK MTD ready
Snap a receipt on WhatsApp. GraftG extracts merchant, total, VAT and category — ready for Making Tax Digital. …
WhatsApp quote builder for UK tradespeople
Describe a job on WhatsApp, get a branded PDF quote back in 30 seconds. Customer name, line items, VAT, totals…
HMRC mileage app for UK self-employed
The UK's simplest HMRC mileage app — uses official 45p/25p AMAP rates, exports to CSV for self-assessment, sen…
CIS invoice app for UK contractors & subcontractors
Handle CIS on WhatsApp: deductions shown on your invoices as a subcontractor, payment & deduction statemen…
Voice-note invoicing on WhatsApp
Send a WhatsApp voice note — "quote for Dave, two days labour, £480 parts" — and get a branded PDF q…
Automatic late payment chasing for UK trades
GraftG chases overdue invoices for you: friendly at 1 day, polite at 7, firm at 14, final notice at 21 with st…
Free invoice template for UK tradespeople
Free, professional invoice template for UK tradespeople. Includes VAT breakdown, payment terms, bank details. …
VAT invoice template for UK tradespeople
What goes on a UK VAT invoice? Requirements, layout, and a free guide for tradespeople. Or skip the template —…
Self-assessment expenses guide for UK tradespeople
What expenses can UK tradespeople claim on self-assessment? Mileage, tools, materials, insurance, phone — the …
Construction Industry Scheme (CIS) — the complete guide
Everything UK contractors and subcontractors need to know about CIS: registration, verification, deduction rat…
WhatsApp invoice app for UK tradespeople
Track jobs in WhatsApp, generate professional PDF invoices when done. Materials, labour, VAT — all calculated.…