Free Business Tools & Tax Calculators
Practical tools for UK business owners, landlords, sole traders, directors, and individuals who want clearer numbers and fewer tax mistakes.
Use the right tool for your situation, then get expert support if you need more than a calculator.
Built by RR Accountants for real tax, accounting, and compliance decisions.
Which tool do I need?
Tell us what you want to know. We will point you to the right tool.
If you want to know…
What you actually keep after tax
If you want to know…
Whether salary or dividends are better
If you want to know…
How much tax your side income creates
If you want to know…
How much self-assessment tax you may owe
If you want to know…
How much company tax you may owe
If you want to know…
Whether a VAT number is registered
If you want to know…
Which SIC code fits your business
If you want to know…
Whether MTD for Income Tax affects you
If you want to know…
Whether to stay sole trader or go limited
If you want to know…
How much capital gains tax you may owe
If you want to know…
Create a VAT-capable invoice
If you want to know…
Set a price and check your margin
If you want to know…
Which deadlines apply to you
If you want to know…
Whether an expense is tax-deductible
Featured tools
Take-Home Pay Calculator
Estimate what you keep after tax, NI, pension, student loan, and dividends where relevant.
Suitable for: Employees, sole traders, individuals
Self-Assessment Tax Calculator
Estimate likely self-assessment tax, National Insurance, and payment-on-account exposure.
Suitable for: Sole traders, landlords, individuals
Salary vs Dividend Optimiser
Compare director remuneration strategies and estimate which structure may be more tax-efficient.
Suitable for: Directors, limited company owners, contractors
Company Profit Tax Calculator
Estimate corporation tax liability based on your company's taxable profit and marginal relief.
Suitable for: Limited companies, directors
VAT Number Checker
Check whether a UK VAT number is registered and view the linked business details.
Suitable for: Businesses checking suppliers or clients
MTD Readiness Checker
Check whether Making Tax Digital for Income Tax is likely to affect you and how ready you are.
Suitable for: Sole traders, landlords
All tools
Take-Home Pay Calculator
Estimate what you keep after tax, NI, pension, student loan, and dividends where relevant.
Suitable for: Employees, sole traders, individuals
Employed & Self-Employed Tax Calculator
Estimate total tax exposure when you have both employment income and self-employment or rental income.
Suitable for: Side-income earners, landlords with day jobs
Self-Assessment Tax Calculator
Estimate likely self-assessment tax, National Insurance, and payment-on-account exposure.
Suitable for: Sole traders, landlords, individuals
Capital Gains Tax Calculator
Estimate capital gains tax on property disposals, shares, or other chargeable assets.
Suitable for: Landlords, property investors, individuals
Salary vs Dividend Optimiser
Compare director remuneration strategies and estimate which structure may be more tax-efficient.
Suitable for: Directors, limited company owners, contractors
Company Profit Tax Calculator
Estimate corporation tax liability based on your company's taxable profit and marginal relief.
Suitable for: Limited companies, directors
Sole Trader vs Limited Company
Compare the tax, admin, and compliance implications of operating as a sole trader or limited company.
Suitable for: Sole traders, new business owners
SIC Code Checker
Find likely SIC code matches based on your business activity and description.
Suitable for: New companies, company formation
VAT Calculator
Calculate VAT-inclusive or VAT-exclusive amounts at standard, reduced, or zero rates.
Suitable for: All VAT-registered businesses
VAT Number Checker
Check whether a UK VAT number is registered and view the linked business details.
Suitable for: Businesses checking suppliers or clients
MTD Readiness Checker
Check whether Making Tax Digital for Income Tax is likely to affect you and how ready you are.
Suitable for: Sole traders, landlords
Invoice Generator
Create professional invoices with automatic calculations, then download as PDF.
Suitable for: Sole traders, freelancers, small businesses
Pricing & Profit Margin Calculator
Calculate selling prices, margins, and markups to make profitable pricing decisions.
Suitable for: Small business owners, product sellers
Expense Deductibility Checker
Check whether a business expense is likely to be tax-deductible based on HMRC rules.
Suitable for: Sole traders, directors, landlords
UK Tax Calendar
View key HMRC and Companies House deadlines and filter what applies to your situation.
Suitable for: All UK taxpayers and business owners
Tax & Income Tools
Tools for individuals, side-income earners, and taxpayers who want clearer visibility on what they owe or keep.
Company & Director Tools
Tools for directors, company owners, and founders making structure, profit, and remuneration decisions.
VAT & Compliance Tools
Tools for VAT checks, compliance readiness, supplier due diligence, and digital tax obligations.
Operations & Planning Tools
Tools for invoicing, pricing, expenses, and practical financial planning.
Why use RR Accountants tools?
Practical, not theoretical
Our tools are built around real UK tax, accounting, and compliance decisions.
Clear next steps
Get useful numbers fast, then know what to do next.
Built for real users
Designed for sole traders, directors, landlords, business owners, and mixed-income taxpayers.
Expert support when needed
When the answer is not straightforward, RR Accountants can help you go further.
Need more than a calculator?
RR Accountants helps businesses and individuals with bookkeeping, tax planning, VAT, payroll, accounts, company setup, and ongoing compliance — when the answer needs more than a quick estimate.
Frequently asked questions
Need help beyond the tools?
RR Accountants supports UK businesses and individuals with tax, bookkeeping, payroll, VAT, accounts, business setup, and practical compliance advice.