Tax Planning Calculators for Freelancers & Self-Employed
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CalculatorZone Editorial Team11 min readPublished Updated
Best Calculators for UK Freelancers and Contractors
Freelancing in the UK means taking control of your income — but also your taxes, national insurance, and business structure. Whether you operate as a sole trader or through a limited company, whether you're inside or outside IR35, the numbers can make a big difference to what you actually keep. These are the key calculations every UK freelancer needs to understand.
Day Rate to Annual Salary Conversion
A common question: "What does my day rate actually equate to as a salary?" The standard calculation assumes 46 billable weeks per year (52 weeks minus 4 weeks holiday and 2 weeks for bank holidays and illness), with 5 days per week = 230 billable days.
Day Rate to Annual Revenue
| Day Rate | Annual Revenue (230 days) |
|---|---|
| £300 | £69,000 |
| £450 | £103,500 |
| £600 | £138,000 |
Revenue is not take-home pay. What you keep depends on your expenses, how you pay yourself (salary, dividends or both), corporation tax and your personal tax position, so run your own figures through a calculator.
IR35: Inside vs Outside
IR35 is anti-avoidance legislation that determines whether a contractor should be taxed like an employee. If you are "inside IR35", your client deducts PAYE tax and NI from your gross fee before paying you — you lose most of the tax advantages of operating via a limited company. If you are "outside IR35", you keep the full fee and pay yourself via salary and dividends.
The financial difference can be significant, because being inside IR35 means PAYE tax and National Insurance are deducted from your fee. Model both situations with your own day rate before you accept a contract.
VAT Registration: The £90,000 Threshold
If your taxable turnover exceeds £90,000 in any rolling 12-month period (the threshold from April 2024), you must register for VAT. You then charge clients VAT (standard rate 20%) and can reclaim VAT on business purchases. The Flat Rate Scheme can benefit some freelancers — you charge 20% VAT but pay a lower flat rate (e.g., 14.5% for IT consultants) to HMRC and keep the difference.
Try our Salary Calculator to compare your take-home as employee vs contractor