UK Day Rate to Salary Calculator
Convert a contractor day rate into an equivalent annual permanent salary. This calculator accounts for employer National Insurance, pension contributions, and holiday entitlement to give you a true like-for-like comparison between contracting and permanent employment in the UK.
How UK Day Rate to Salary Calculator Works
Convert a UK contractor day rate to an equivalent permanent salary. Accounts for employer NI, pension contributions, and holiday entitlement. Enter your values into the form above and the calculator processes them instantly in your browser — no data is sent to any server.
How to Convert a Day Rate to an Equivalent Salary
Comparing a contractor day rate to a permanent salary is not as simple as multiplying the day rate by the number of working days in a year. A permanent employee receives benefits that a contractor must fund themselves, including employer National Insurance contributions, workplace pension contributions, paid holidays, sick pay, and various other benefits. When a company hires a permanent employee, the true cost to the employer is significantly higher than the gross salary alone. Conversely, when a contractor quotes a day rate, that rate must cover periods of unpaid leave, pension contributions, insurance, training, and the administrative overhead of running a business. This calculator bridges the gap by adjusting for these factors to produce a meaningful comparison.
The starting point is the gross contractor income, calculated by multiplying the day rate by the total number of available working days in the year (typically 220 days, which accounts for weekends but not holidays or sick days). From this, we subtract the holiday days that a permanent employee would receive as paid leave. The UK statutory minimum is 28 days (including bank holidays) for a full-time worker, though many employers offer more. This gives the actual working days and the actual annual income. To find the equivalent permanent salary, we then divide this figure by the employer overhead factor, which includes employer National Insurance at 13.8 percent and auto-enrolment pension contributions, typically at least 3 percent. The result is the gross annual salary that would cost the employer the same amount as the contractor day rate.
Day Rate to Salary Conversion Formulas
Gross Contractor Income: Day Rate × Working Days Per Year
Actual Annual Income: Day Rate × (Working Days − Holiday Days)
Equivalent Salary: Actual Annual Income ÷ (1 + Employer NI% + Pension%)
Employer Cost Equivalent: Actual Annual Income × (1 + Employer NI% + Pension%)
Daily Rate Premium: ((Gross Contractor Income ÷ Equivalent Salary) − 1) × 100%
Where:
- Working Days Per Year = Typically 220 (260 weekdays minus holidays and sick days)
- Employer NI = 13.8% above the secondary threshold
- Pension = Minimum 3% employer contribution under auto-enrolment
Why Contractors Charge Higher Day Rates
It is common for people to see a contractor earning 500 pounds per day and assume they earn far more than a permanent employee on 60,000 pounds per year. However, the reality is more nuanced. Contractors do not receive paid holidays, so they lose income for every day they take off. They do not receive employer pension contributions, so they must fund their own retirement savings. They pay for their own professional indemnity insurance, accounting services, equipment, and training. They bear the risk of gaps between contracts when they earn nothing at all. Additionally, contractors operating through limited companies face corporation tax on profits, and those affected by IR35 legislation may face an even higher effective tax burden. When all of these factors are considered, a contractor charging 500 pounds per day may have an equivalent permanent salary of only 55,000 to 70,000 pounds, depending on their working pattern and overheads.
Understanding Employer Costs in the UK
Employer National Insurance contributions are a significant additional cost of permanent employment. As of 2026, employers pay 13.8 percent on employee earnings above the secondary threshold. This means an employee earning 50,000 pounds costs the employer approximately 6,300 pounds in NI alone, before any other benefits. Workplace pension auto-enrolment requires employers to contribute at least 3 percent of qualifying earnings, adding another 1,200 to 1,500 pounds per year for a typical salary. Many employers contribute more than the minimum, with 5 to 8 percent being common in competitive industries. When you add apprenticeship levy contributions (0.5 percent for large employers), statutory sick pay obligations, maternity and paternity pay, and other employment costs, the total employer overhead can reach 20 to 25 percent above the gross salary. This is why the equivalent salary figure from this calculator is always significantly lower than the raw day rate multiplied by working days.
Going the Other Way: Salary to Day Rate
Many people reach this calculator while doing the reverse sum — working out what day rate they would need to charge as a contractor to match their current permanent salary. As a quick rule of thumb, take your gross salary, add the employer overhead an employer currently pays on your behalf (employer National Insurance plus pension), then divide by the number of days you actually expect to bill in a year rather than the full 220. Because contracting carries gaps between contracts, unpaid holidays and your own overheads, a realistic day rate usually needs to be noticeably higher than the figure this tool returns. If you want the full picture of contracting versus permanent take-home, our contractor vs employee calculator compares both sides cost-for-cost, and the day rate calculator helps you move between hourly, daily and annual figures.
What This Calculator Does Not Include
To keep the comparison clear, this calculator focuses on the core employer-cost gap — employer National Insurance, pension and paid holidays. It does not model your personal income tax or take-home pay, which depend on your tax code, region and other income. Once you know the equivalent salary, use our UK income tax calculator to see the actual take-home figure after income tax and employee National Insurance. The calculator also does not decide your IR35 status; that depends on the specific working arrangement, and you should check current guidance from HMRC's employment status guidance or take professional advice before relying on any figure for a contract decision.
Example Calculation
Contractor at £500/day
A contractor charges £500 per day, works 220 days per year, takes 25 holiday days. Employer NI is 13.8% and pension is 3%.
- Gross Contractor Income = £500 × 220 = £110,000
- Actual Annual Income = £500 × (220 − 25) = £500 × 195 = £97,500
- Equivalent Salary = £97,500 ÷ (1 + 0.138 + 0.03) = £97,500 ÷ 1.168 = £83,476
- Employer Cost Equivalent = £97,500 × 1.168 = £113,880
- Daily Rate Premium = (£110,000 ÷ £83,476 − 1) × 100 = 31.8%
Frequently Asked Questions
How many working days are in a UK year?
A standard UK year has 260 weekdays (52 weeks times 5 days). After subtracting 8 bank holidays and allowing for approximately 20 days of annual leave and a few sick days, most calculators use 220 to 230 working days as the default. Contractors who take less holiday might use a higher number, while those who prefer more time off or who experience gaps between contracts might use a lower figure. The number you choose significantly affects the equivalent salary calculation, so it is important to be realistic about how many days you actually work or expect to work.
What is employer National Insurance and why does it matter?
Employer National Insurance is a tax that UK employers pay on top of employee salaries. As of 2026, the rate is 13.8 percent on earnings above the secondary threshold. This is a real cost to the employer that does not appear on the employee payslip. When converting a contractor day rate to an equivalent salary, employer NI must be factored in because it represents money the employer would need to spend on top of the gross salary. For a permanent employee earning 60,000 pounds, employer NI adds approximately 7,500 pounds to the total employment cost.
Should I include pension contributions in the calculation?
Yes, including pension contributions provides a more accurate comparison. Under UK auto-enrolment rules, employers must contribute at least 3 percent of qualifying earnings to a workplace pension. Many employers contribute more, with 5 to 8 percent being common. When a contractor converts to permanent employment, they gain access to these employer pension contributions, which represent real additional compensation. If you are a contractor considering going permanent, including pension contributions in the calculation shows you the true value of the permanent package beyond just the gross salary.
How does IR35 affect this calculation?
IR35 is the UK legislation that determines whether a contractor is genuinely self-employed or is effectively a disguised employee. If a contract is caught by IR35 (inside IR35), the contractor must pay income tax and National Insurance at rates similar to permanent employees, significantly reducing their take-home pay. In this scenario, the day rate to salary comparison becomes even more important because the tax advantages of contracting are largely eliminated. A contractor inside IR35 may find that their effective earnings are very close to or even below what they would earn as a permanent employee on the equivalent salary.
Why is the equivalent salary lower than expected?
The equivalent salary is lower than simply multiplying the day rate by working days because it accounts for the hidden costs of permanent employment. Employer National Insurance at 13.8 percent and pension contributions at 3 percent or more add 16.8 percent or more to the cost of a permanent employee. Additionally, permanent employees receive paid holidays (typically 25 to 30 days plus bank holidays), which means they work fewer days while still being paid. When you divide the contractor actual annual income by the employer overhead factor and account for paid holidays, the resulting salary reflects what an employer could afford to pay in gross salary for the same total cost as the contractor.
What day rate do I need to match a UK salary in 2026?
To go from a permanent salary to a day rate, start with the total cost of employing you, which is your gross salary plus employer National Insurance and pension contributions. Then divide that total by the number of days you realistically expect to bill in a year, not the full 220, because contractors lose income to gaps between contracts, unpaid holidays, sick days and admin. A common rule of thumb is to take your salary, add roughly 15 to 20 percent for employer overhead, and divide by around 200 to 220 billable days, but you should also add a margin for your own insurance, accounting and the risk of unpaid time. Enter your figures above to see the equivalent salary instantly, then adjust the working days to model a more cautious billing pattern.