Understanding Pro Rata Salary: How to Read the Headline Rate in 2026

Understanding Pro Rata Salary and the Headline Rate

When you see a job advert quoting a salary like ‘£25,000 pro rata’, it can be confusing – especially when you’re trying to work out whether the pay meets the legal minimum. This guide explains what pro rata salary means, how it relates to the National Living Wage and National Minimum Wage, and what to watch out for when comparing advertised pay with statutory rates.

What Is Pro Rata Salary?

‘Pro rata’ is Latin for ‘in proportion’. In UK employment, a pro rata salary is the full-time equivalent (FTE) annual figure. If the role is part-time, your actual pay is scaled down by the proportion of full-time hours you work. For example, if a job is advertised as ‘£30,000 pro rata’ and the full-time week is 37.5 hours, a person working 18.75 hours per week (0.5 FTE) would earn £15,000 per year.

Employers often use pro rata salaries to make part-time roles look more attractive and to simplify comparisons between full-time and part-time positions. However, the headline figure can be misleading if you don’t convert it to an hourly rate and check it against the statutory minimum.

Hourly Statutory Rates vs Advertised Salaries

From April 2026, the statutory minimum hourly rates are:

• National Living Wage (21+): £12.71 per hour
• National Minimum Wage (18–20): £10.85 per hour
• National Minimum Wage (under 18): £8.00 per hour
• Apprentice rate: £8.00 per hour

These rates are set by the government and apply to almost all workers. A pro rata salary must, when broken down to an hourly rate, be at least equal to the relevant age-based minimum. If the advertised salary seems generous but the hours are low, the hourly rate might still be below the legal floor.

For instance, a job offering ‘£18,000 pro rata’ for a 0.6 FTE role (21 hours per week in a 35-hour week) actually pays about £9.89 per hour – well above the under-18 rate but below the £12.71 NLW for those aged 21+. Always do the maths.

How to Calculate Your Actual Hourly Rate from a Pro Rata Salary

Follow these steps:

1. Identify the full-time hours used by the employer. This is often stated in the advert or contract. Common full-time weeks are 35, 37.5, or 40 hours.
2. Divide the pro rata salary by 52 to get the weekly full-time equivalent.
3. Divide that weekly figure by the full-time hours to get the hourly rate.
4. Compare that hourly rate to the statutory minimum for your age group.

Example: A part-time role advertised as ‘£22,000 pro rata’ with full-time hours of 37.5 per week. £22,000 ÷ 52 = £423.08 per week. £423.08 ÷ 37.5 = £11.28 per hour. For a worker aged 21+, this is below the £12.71 NLW – so the salary would be illegal unless the employer adjusts it.

Take-Home Pay Considerations

The headline hourly rate or pro rata salary is not the same as what you take home. Tax, National Insurance, pension contributions, and benefits like Universal Credit all affect net income. The government’s analysis shows that a single full-time NLW worker (35 hours per week) would see a 3.3% increase in weekly take-home pay from the April 2026 uplift, partly because tax thresholds remain frozen. In contrast, a couple with children on Universal Credit could see a larger net gain because the standard allowance rises by 6.2% (GOV.UK guidance).

If you’re considering a part-time role with a pro rata salary, factor in how your tax code and any means-tested benefits will change. Use a reputable take-home pay calculator, but remember that your actual income depends on your exact circumstances.

Common Pitfalls with Pro Rata Salaries

• Unclear full-time hours: Some adverts don’t specify the full-time hours used for the pro rata calculation. Always ask before accepting.
• Overtime and unsocial hours: Pro rata salaries usually cover basic hours only. If you work overtime or night shifts, you may be entitled to additional pay – but check your contract.
• Benefits and holiday: Statutory holiday entitlement is also pro rated. A part-time worker on a 0.5 FTE contract gets 2.8 weeks’ paid holiday (half of 5.6 weeks). Pension contributions and sick pay may also be scaled.
• Regional variations: Some employers add a London weighting or regional supplement. This is separate from the pro rata salary and should be clearly stated.

Using Our Pay Guides and Data

For more detailed information on how to compare salaries and check compliance, see our pay guides and pay data pages. You can also read our UK Minimum Wage overview for the latest statutory rates and how they apply to different age groups.

Final Thoughts

A pro rata salary is a useful shorthand, but it’s only a starting point. Always convert it to an hourly rate and compare it to the National Living Wage or National Minimum Wage. Remember that your actual take-home pay will depend on tax, benefits, and hours worked. If you’re unsure, ask the employer for a written breakdown of how the salary is calculated. Knowing how to read the headline rate will help you make informed decisions and ensure you’re paid fairly.