Perm to contract calculator for UK salary and day rate comparisons

Our comprehensive tool helps UK professionals easily compare their permanent salary with equivalent contract day rates, monthly pay, and annual income. Whether you're considering the leap into contracting or evaluating a return to permanent employment, get clear financial visibility in seconds.

Navigating the transition requires more than a basic annual income calculator. As a dedicated contractor salary calculator UK, we factor in hidden costs, lost benefits, and risk premiums to give you an accurate picture. Use our salary calculator and day rate calculator features to ensure your next career move makes financial sense.

How It Works

The calculator operates in two modes: Perm to Contract and Contract to Perm. From a user perspective, the process is simple but the logic underneath is robust.

Inputs: You start by entering your base salary or current day rate. You then adjust key variables such as your expected annual bonus, employer pension contribution percentage, and paid holiday allowance. For contractors, you input expected billable days and annual business costs. Finally, you set a "Desired Uplift" which represents the risk premium you require to give up employment security.

Outputs: The tool instantly calculates the total value of your package. It then displays a "Break-Even Rate" (the absolute minimum day rate to not lose money) and a "Target Rate" (the rate you should aim for to make contracting financially worthwhile). In reverse, it shows the "Equivalent Base Salary" a contractor should demand if returning to permanent work.

When Perm to Contract Makes Financial Sense

Going Contract

Contracting pays better when you have highly sought-after, specialized skills and can secure back-to-back outside IR35 contracts.

You want to maximize short-term cash flow.
You are comfortable managing business administration and taxes.
You have a 3-6 month financial safety net for "bench time".
You do not rely heavily on company sick pay or structured career progression.

Staying Permanent

A permanent salary is often superior if you heavily utilize workplace benefits or value long-term stability over short-term revenue.

You receive high employer pension contributions (10%+).
You plan to apply for a mortgage soon (banks prefer perm).
You require paid parental leave or expect periods of sickness.
The contract offered is Inside IR35 with a low day rate.

Frequently Asked Questions

What's the difference between perm and contract work in the UK?: A permanent (perm) employee has a contract of employment, guaranteed salary, statutory rights (like sick pay and redundancy), and employer pension contributions. A contractor operates as a B2B service provider, trading employment rights for a higher gross daily rate and flexibility.
How do I calculate my day rate from an annual salary?: Do not just divide your salary by 260 weekdays. Add your base salary, bonus, pension value, and holiday value. Divide that total by realistic billable days (usually 220). Then add your business costs and a risk uplift (usually 15-30%) to find your target day rate. Our calculator automates this math.
What's a typical contract day rate in the UK?: Rates vary wildly by industry. Administrative roles might pay £150-£250/day. Mid-level IT and project management often sit between £350-£550/day. Senior consultants, enterprise architects, and specialized finance contractors can command £700-£1,200+ per day.
Do I need to pay tax differently as a contractor?: Yes. Permanent employees pay Income Tax and National Insurance via PAYE. If you contract outside IR35 through a Limited Company, you pay Corporation Tax on profits and draw income via salary and dividends. This requires an accountant and active financial management.
What is IR35 and how does it affect my income?: IR35 is UK tax legislation. "Inside IR35" means HMRC views you as an employee for tax purposes, meaning you pay PAYE taxes and employer taxes from your rate, significantly lowering net income. "Outside IR35" means you are taxed as a business.
Should I go contract or stay permanent?: It depends on your risk tolerance. Go contract if you want to maximize income, choose your projects, and have a financial buffer. Stay permanent if you prioritize job security, mortgages, paid time off, and employer pension matching.
How do holiday and sick pay affect the comparison?: As a contractor, you do not get paid holidays or sick leave. You must price these into your day rate. If you take 25 days off, you lose 5 weeks of revenue. This is why the calculator defaults to 220 billable days out of a possible 260.
What about pension contributions?: Permanent employers must contribute to your pension. Contractors must fund their own pensions from company revenue. The calculator adds the financial value of the employer's contribution to your target day rate so you don't take a hidden cut to your retirement savings.
Can I use this calculator for freelance work?: Yes, freelancers charging day rates can use this tool to benchmark their pricing against full-time salaries. However, if you charge hourly or by project deliverables, the direct day rate equivalence may be less accurate.
What assumptions does this calculator use?: The calculator assumes a standard 260-weekday year. It assumes your desired uplift covers the risk of sudden termination. It does not calculate precise net take-home pay, student loans, or nuanced IR35 tax deductions. It provides gross package equivalence.
Is a £400 day rate good in the UK?: A £400 day rate is roughly equivalent to a permanent base salary of £55,000 - £65,000 depending on the benefits you are giving up and the risk premium you assign. It is a solid rate for mid-level professionals but low for senior management or highly specialized tech roles.

Assumptions and Limitations

To provide a standardized baseline, this calculator operates on several necessary assumptions:

Working Days: A calendar year has 260 weekdays. We deduct 8 bank holidays and recommend budgeting for 25 days leave and 7 sick days, resulting in 220 billable days.
No Net Tax Output: This tool calculates gross package equivalence. It does not calculate exact net take-home pay, personal Income Tax, Corporation Tax, Dividend Tax, or National Insurance.
IR35 Neutrality: The calculator assumes basic gross-to-gross parity. If a contract is Inside IR35, the day rate required to achieve parity increases significantly.

Disclaimer: This tool is for informational and educational purposes only. It is not financial, legal, or tax advice. Tax legislation is complex and individual circumstances vary. Always consult with a qualified professional accountant before making major financial or career decisions.