Free business tools can help sole traders and small businesses understand important figures before organising their records or seeking support.
FREE UK BUSINESS RESOURCES
Useful calculators for clearer business decisions
Explore practical tools for sole traders, small businesses, landlords, drivers, tradespeople and contractors. Each calculator provides a quick general estimate and links to relevant guidance.
SOLE TRADERS & SMALL BUSINESSES
Income, tax and record-keeping tools
Self-Employed Tax & NI Calculator
Estimate 2026/27 sole trader profit, Income Tax and Class 4 National Insurance.
For sole traders, freelancers, drivers and consultants
Open tax calculator →Business Mileage Calculator
Calculate simplified vehicle expenses using HMRC mileage rates for 2025/26 and 2026/27.
For drivers, tradespeople and mobile businesses
Calculate mileage →MTD Start Date Checker
Estimate when Making Tax Digital for Income Tax may apply to self-employment or property income.
For sole traders and landlords
Check your MTD date →VAT TOOLS
VAT registration and price calculations
VAT Registration Threshold Checker
Check whether rolling taxable turnover or expected 30-day turnover may trigger VAT registration.
For growing sole traders and small businesses
Check VAT threshold →UK VAT Calculator
Add VAT to a net price or remove VAT from a gross total at 20%, 5% or 0%.
For invoices, quotations and purchase checks
Calculate VAT →CONSTRUCTION & TRADES
CIS deduction support
CIS Deduction Calculator
Calculate 20%, 30% or gross-payment CIS deductions after VAT and qualifying direct costs.
For contractors and subcontractors
Calculate CIS deduction →Need help with CIS records?
Learn how we organise invoices, deduction statements, materials, VAT and contractor payments.
Bookkeeping support in Wolverhampton and remotely
Explore CIS bookkeeping →LANDLORDS
Rental property records and profit
Rental Property Profit Calculator
Compare rental cash profit with taxable property profit and understand residential finance-cost treatment.
For individual and limited-company landlords
Calculate rental profit →Landlord Accountancy Support
Keep rent, agent statements, repairs, finance costs and property records organised throughout the year.
Practical bookkeeping support for landlords
Explore landlord support →How to use these tools
These free calculators provide general estimates only. They do not replace bookkeeping records, an official HMRC calculation or advice based on your circumstances. Rates and rules can change, so each tool links to relevant official guidance. Figures entered into the calculators remain in your browser and are not sent to Real Key Accountancy.
NEED HELP WITH YOUR RECORDS?
Turn your estimate into organised bookkeeping
Speak to Real Key Accountancy about practical support for your business, property or contracting records.
Why use Real Key Accountancy’s free business calculators?
Good financial decisions begin with clear records and a basic understanding of the figures. Our calculators help UK small-business owners explore common questions about VAT, mileage, CIS, rental income, Making Tax Digital and estimated sole trader liabilities.
Each result is designed as a starting point. If the figures reveal that you may be approaching a threshold, carrying a growing record-keeping burden or need more reliable reports, contact Real Key Accountancy to discuss practical bookkeeping and accountancy support.
Who are these tools for?
- Sole traders and start-ups
- Taxi and delivery drivers
- Tradespeople, contractors and subcontractors
- Landlords and property businesses
- Consultants, freelancers and local service businesses
- Growing businesses approaching VAT or MTD thresholds
How free business tools support better records
Use these free business tools alongside reliable bookkeeping, not instead of it. Check current rules through HMRC’s official tax guidance, then keep the records that support every figure.