Employment & Pay19 October 2026

Going Part-Time: What Happens to Your Pay, Pension, Holiday and Benefits

Written and reviewed by, LLM (UK), CFP®·Published

Going Part-Time: What Happens to Your Pay, Pension, Holiday and Benefits

Dropping from five days a week to four, or to three, is one of the biggest financial decisions most employees make, and it is usually made on a rough guess: "I will lose a fifth of my pay." In practice you lose less than that in take-home pay, but more than you might think in pension, and the effect on holiday, student loan and benefits is easy to miss.

This guide works through what actually changes in 2026/27, with worked examples, and covers your legal rights when you ask.

Try it yourself: the Pro-Rata Salary Calculator shows your part-time salary and take-home pay from your full-time salary and hours, and the Holiday Entitlement Calculator works out your leave.

Your gross pay falls in proportion

Pro-rata pay is simple: your full-time salary multiplied by your hours divided by full-time hours. Four days out of five is 80%; three days is 60%. Your hourly rate stays the same.

The Part-time Workers Regulations 2000 say part-time workers must not be treated less favourably than comparable full-time workers unless the employer can objectively justify it. GOV.UK gives the example that someone working half the hours of a full-timer gets half of a £1,000 bonus. The same pro-rata principle applies to pay rates, holiday, pension opportunities and training. If your hourly rate falls when you go part-time, ask why.

One check: your hourly rate must stay at or above the National Living Wage, £12.71 an hour for workers aged 21 and over from 1 April 2026.

Take-home pay falls by less than gross pay

Income tax and National Insurance are charged in bands. When you cut your hours, the pay you give up comes from the top slice, which is taxed most heavily. The Personal Allowance and the lower bands are still there for the pay you keep.

Worked example. An employee in England earns £40,000 full-time, with no pension or student loan.

Pattern Gross salary Income tax Employee NI Take-home Take-home vs full-time
5 days £40,000 £5,486 £2,194.40 £32,319.60 100%
4 days £32,000 £3,886 £1,554.40 £26,559.60 82.2%
3 days £24,000 £2,286 £914.40 £20,799.60 64.4%

Going to four days cuts gross pay by £8,000 but take-home by £5,760. Going to three days cuts gross pay by 40% but take-home by about 36%.

The effect is far stronger for higher earners. Someone on £120,000 is in the £100,000 to £125,140 band where the Personal Allowance is withdrawn. At four days their salary becomes £96,000 and they get the whole allowance back. Gross pay falls by £24,000, but take-home falls only from £76,157.40 to £66,237.40, a drop of £9,920. They keep 87% of their take-home for 80% of the hours. Our guide to the £100,000 tax trap explains why.

Student loan repayments may stop

Student loan repayments are 9% of income above your plan's threshold, so they fall faster than your pay, and may stop altogether. For Plan 2 the 2026/27 threshold is £29,385.

Take the £40,000 earner again, now with a 5% salary sacrifice pension and a Plan 2 loan. Full-time, they repay £775.35 a year. At three days, their pay after sacrifice is £22,800, below the threshold, so repayments drop to £0. Their take-home falls from £30,104.25 to £19,935.60, keeping 66% of it on 60% of the pay. Interest still runs on the balance, and for Plan 2 any balance is written off after 30 years, so lower repayments are not necessarily a bad thing. See should you overpay your Plan 2 student loan.

Your pension: the real long-term cost

Pensions are where going part-time costs most, and the cost is invisible on your payslip.

Defined contribution pensions. Contributions are usually a percentage of salary, so they fall in proportion: a 5% employee and 5% employer contribution on £24,000 is £2,400 a year, against £4,000 at £40,000. Over a decade of part-time work, the missing contributions and the growth on them can be substantial. The Pension Calculator shows the long-term difference.

Auto-enrolment minimums. Many employers pay only the legal minimum: 8% in total of qualifying earnings between £6,240 and £50,270, at least 3% from the employer. Because the first £6,240 is excluded, the minimum falls faster than your pay:

Salary Qualifying earnings Minimum total contribution Employer minimum (3%)
£40,000 £33,760 £2,700.80 £1,012.80
£24,000 £17,760 £1,420.80 £532.80
£9,706.67 £3,466.67 Only if you opt in £104.00 if you opt in

Falling below £10,000. Employers only have to enrol you automatically if you earn more than £10,000 a year. Someone on a £26,000 full-time salary (37.5 hours) who drops to 14 hours a week earns £9,706.67, so would no longer be enrolled automatically. You can still ask to join, and because you earn more than £520 a month, gov.uk confirms your employer must then contribute. Make sure you opt in.

Defined benefit schemes. Most public sector and some private schemes build up pension in proportion to the hours you work, so a year at three days earns roughly 60% of a full-time year. Check your scheme's rules.

Salary-linked benefits. Death in service cover, income protection and some bonuses are often a multiple of salary, so they shrink too. Check whether they are based on your actual or full-time equivalent salary.

Holiday entitlement

Statutory holiday is 5.6 weeks of your normal working week. GOV.UK gives the example that someone working 3 days a week is entitled to at least 16.8 days (3 x 5.6).

Working pattern Statutory minimum
5 days 28 days
4 days 22.4 days
3 days 16.8 days
14 hours over 2 days 78.4 hours (11.2 days)

Employers do not have to give bank holidays as paid leave, but they can count them towards your statutory 5.6 weeks. If your contract gives full-timers a set number of days "plus bank holidays", your bank holiday allowance should be pro-rated too, otherwise someone who does not work Mondays loses out. Many employers express everything in hours to avoid that problem. If you work irregular hours or part of a year, the rules are different; the Holiday Entitlement Calculator handles those cases.

Compressed hours: the alternative

Compressed hours means working full-time hours over fewer days, such as a 9-day fortnight or 37.5 hours over four days. Your pay, pension and tax do not change. Your holiday is the same in hours (210 hours for 37.5 a week), but each day off uses more of it: 210 hours is 22.4 days of 9.375 hours. Compressed hours suit people who want time back without the pay cut; part-time suits those who need the hours themselves.

Benefits and the State Pension

Universal Credit. If you claim Universal Credit, your payment changes as your earnings change, so going part-time may increase it. The calculation depends on your household, so use the gov.uk guidance on how wages affect Universal Credit or a benefits calculator before deciding.

State Pension. Earnings at or above the Lower Earnings Limit of £6,708 for 2026/27 still give you a qualifying year for the State Pension, even though no employee NI is paid until £12,570. The 14-hour worker above, on £9,706.67, pays no NI but still builds State Pension.

Your right to ask

Every employee can request flexible working, including part-time or compressed hours, from their first day in a job. You can make 2 requests in any 12-month period, and your employer must decide within 2 months unless you agree to a longer period.

Your employer must discuss the request with you before refusing it, and can only refuse for one of the business reasons on gov.uk, such as extra costs, being unable to reorganise work among other staff, or an effect on quality or performance.

Practical tips:

  • Put the request in writing, say which days and hours, and when you want it to start.
  • Explain how the work will be covered. Requests that solve the problem for the manager tend to succeed.
  • Consider proposing a trial period, and agree in writing whether the change is permanent.
  • Ask how your bonus, pension, benefits and holiday will be calculated before you sign.

Frequently asked questions

Will my tax code change when I go part-time? Not usually. A code like 1257L stays the same. PAYE adjusts automatically because your pay is lower.

Is my hourly rate protected? Generally yes. Treating part-timers less favourably than comparable full-timers is unlawful unless objectively justified.

Do I keep the same overtime rate? Not necessarily. Gov.uk says part-timers may not get overtime rates until they work beyond a full-timer's normal hours.

Should I go part-time or compress my hours? If you want the same pay and pension, compress. If you need fewer working hours, go part-time, and look at pension contributions to make up the shortfall.

The bottom line

Going part-time cuts your gross pay in proportion, but your take-home pay falls by less because the pay you give up was taxed at your highest rate: on £40,000, dropping to four days costs £5,760 in take-home, not £8,000. The bigger long-term cost is usually your pension. Check your holiday is properly pro-rated, opt in to your pension if you fall below £10,000, and use your day-one right to request flexible working.

See your own figures with the Pro-Rata Salary Calculator.

Related calculators and guides

This article is for general guidance only and is not personalised tax or employment advice. Tax rules are complex and your circumstances may differ. For advice tailored to your situation, speak to a qualified accountant or tax adviser. Figures are for the 2026/27 tax year and sourced from gov.uk.

Sources

Rates and rules in this article are taken from the official pages below. Figures were checked against these sources at the last review date shown above; always confirm against the source before acting.

About the author

, LLM (UK), CFP®, CIM®, PFP®. Financial planner with 18 years in banking and wealth management, holding a UK master of laws and the Canadian CFP®, CIM® and PFP® designations. Writes and reviews every calculator and article on FinanceToolz.

Rates and thresholds in this article are taken from HMRC and GOV.UK. See our editorial policy for how content is sourced, reviewed and corrected. This is general information, not regulated financial advice.

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