Unused Holiday on a Pro Rata Contract: What You’re Owed

Leaving a job is stressful enough without discovering your final pay is light by several hundred pounds. One of the most common reasons for a shortfall — and one of the least understood — is unused holiday pro rata: the paid leave you’ve earned but haven’t taken by your last day, which your employer must by law pay you for.

Whether you’re resigning, being made redundant, or coming to the end of a fixed-term contract, the rules are the same. This guide explains exactly how your payment in lieu is calculated, walks through worked £ examples for typical part-time patterns, and flags the traps — like overtaken holiday clawbacks — that can shrink your final pay.

The core rule: accrued but untaken leave must be paid

When your employment ends, you are entitled to be paid for any statutory holiday you have accrued (earned through service) but not taken. This is called payment in lieu of untaken leave, and it’s not discretionary — it’s a legal requirement under the Working Time Regulations.

The formula employers should use:

(Annual entitlement × proportion of leave year worked) − leave already taken = days owed

Or in months, which is how most payroll departments do it:

Days owed = (annual entitlement × complete months worked ÷ 12) − days taken

Two things to note. First, this covers your statutory minimum (5.6 weeks pro rata). Any extra contractual holiday above the minimum is governed by your contract — most contracts also pay it out, but check the wording. Second, “complete months” is the usual method, but some employers calculate by weeks or days; the differences are small, but if you’re borderline, ask which method payroll uses.

Worked example 1: resigning mid-year on fixed part-time hours

Let’s start with the classic case. Grace works three days a week (Monday–Wednesday) on a £24,000 pro rata salary. Her annual leave entitlement is 16.8 days (28 × 3 ÷ 5), bank holidays included. She resigns, and her last day is 30 June — 6 complete months into the leave year (assume the leave year runs January to December).

Step 1 — Accrued entitlement: 16.8 × (6 ÷ 12) = 8.4 days.

Step 2 — Leave taken: Grace took 5 days’ holiday in March. Balance: 8.4 − 5 = 3.4 days owed.

Step 3 — Daily rate: Grace works 3 days a week, so roughly 156 days a year. £24,000 ÷ 156 = £153.85 per day.

Step 4 — Payment in lieu: 3.4 × £153.85 = £523.08 (gross — tax and NI still apply).

That £523 should appear as a separate line on her final payslip, something like “Holiday pay in lieu: £523.08”. If her final pay arrives without it, the first step is a polite email to payroll with this calculation attached. In our experience, most missing payments are admin oversights rather than malice — but you only get it if you ask.

Worked example 2: redundancy with a long untaken balance

Redundancy often produces the biggest payouts, because people tend not to take much holiday while consulting about their future. Consider Robert, who works four days a week on £30,000 pro rata. His entitlement: 22.4 days. He’s made redundant at the end of October — 10 complete months.

Accrued: 22.4 × (10 ÷ 12) = 18.67 days.
Taken: 11 days (he’d been saving the rest).
Owed: 7.67 days.

Robert’s daily rate: 4 days × 52 = 208 working days a year; £30,000 ÷ 208 = £144.23.

Payment in lieu: 7.67 × £144.23 = £1,106.24 gross.

A few extra points for redundancy cases. First, this payment is separate from any statutory or contractual redundancy pay — it’s wages owed, not compensation. Second, it counts towards the £30,000 tax-free limit on termination payments only in specific circumstances; in most cases, payment in lieu of holiday is fully taxable as earnings (unlike some other termination payments). Don’t assume it’s tax-free — check with payroll or an adviser if the sums are large.

Worked example 3: variable hours and the 12.07% balance

For irregular-hours staff, there’s no fixed annual figure to pro-rate — instead, you look at the accrued balance. Take Lena, a zero-hours care worker. Over her final 7 months she worked 812 hours, accruing 812 × 12.07% = 98 hours of holiday. She took 40 hours of leave during that time.

Owed: 98 − 40 = 58 hours.

Lena’s average hourly rate over the period was £12.40 (including the effect of any rolled-up pay adjustments — and note: if her employer was already paying rolled-up holiday pay at 12.07%, there may be nothing further owed, because she received the money as she went; this is exactly why the payslip line matters).

Payment in lieu: 58 × £12.40 = £719.20 gross.

The critical question for variable-hours leavers: was I on accrual or rolled-up pay? If accrual, you’re owed the balance. If rolled-up, you’ve already been paid it period by period. Employers sometimes get this wrong in the leaver’s favour or theirs — so dig out your payslips and check for a holiday pay line before your last day.

The reverse trap: overtaken holiday and clawbacks

Payment in lieu works both ways. If you’ve taken more holiday than you’d accrued by your leaving date, your employer may deduct the excess from your final pay — but only if your contract allows it.

Example: David works two days a week (11.2 days annual entitlement). He takes a two-week holiday in February — all 11.2 days, his full entitlement — then resigns at the end of April (4 months in).

Accrued by leaving date: 11.2 × (4 ÷ 12) = 3.73 days.
Taken: 11.2 days.
Overtaken: 7.47 days.

David’s salary is £18,000 pro rata for 2 days a week (~104 working days a year), so his daily rate is £173.08. The potential clawback: 7.47 × £173.08 = £1,293 — a painful chunk of a final pay packet.

Whether the employer can actually deduct this depends entirely on the contract. A well-drafted contract includes an express clause permitting deduction of overtaken holiday from final pay. Without such a clause, the employer generally cannot deduct it from wages (though they could theoretically pursue it as a debt — in practice, most don’t for small amounts). Before you resign, it’s always worth doing this sum yourself so there are no surprises.

Notice periods and “gardening leave”

A related question: can your employer force you to take your unused holiday during your notice period instead of paying it out? Yes — employers can require you to take holiday during notice, provided they give proper notice (generally twice the length of the holiday, e.g., two weeks’ notice for one week’s leave). Many employers do exactly this to avoid a payout.

What they can’t do is simply refuse to pay for accrued untaken leave at termination and refuse to let you take it either. One or the other must happen: time off or money.

If you’re on gardening leave (paid to stay away during notice), the position is the same — holiday continues to accrue during gardening leave, and anything untaken at the end is paid in lieu.

Unused holiday table: quick reference by pattern

Assuming a January–December leave year and no leave taken, here’s what accrues by leaving date for common patterns (statutory minimum, bank holidays included):

Subtract what you’ve taken, multiply the remainder by your daily rate, and you have your payment in lieu. Remember to check whether your contract adds extra days above these statutory figures — and whether your employer’s leave year starts in January (many start in April or on your anniversary).

Frequently asked questions

Is payment in lieu of holiday taxed?

Yes, in almost all cases. It’s treated as earnings and subject to income tax and National Insurance through PAYE, just like normal wages. It does not usually fall within the £30,000 tax exemption for termination payments. If the payout pushes your final month’s pay unusually high, you might temporarily pay more tax that month, but it reconciles across the tax year.

My employer says “use it or lose it” — can they refuse to pay my untaken leave when I leave?

The “use it or lose it” rule applies within employment — you generally can’t carry leave forward. But on termination, the position is completely different: accrued untaken statutory leave must be paid. An employer cannot contract out of this. If they refuse, that’s an unlawful deduction from wages, and you can take it to an employment tribunal.

What if my leave year isn’t January to December?

Many employers run April-to-March leave years, and some use the anniversary of your start date. The formula is identical — just count complete months from your leave year’s start to your leaving date. This is the single most common source of disputes (“I thought I had more than that”), so confirm your leave year dates with HR before doing the maths.

Does my notice period count towards accrual?

Yes. You remain employed during your notice period — including gardening leave — so you keep accruing holiday throughout it. Your leaving date for the calculation is your last day of employment, not the day you handed in your notice. For a three-month notice period, that’s an extra quarter-year of accrual, which can be worth real money.

Before your last day

Run the numbers yourself before you go: annual entitlement, months worked, leave taken, daily rate. Compare your figure with the final payslip, and query any gap immediately — it’s far easier to fix while payroll still has your file open than months later. For the daily-rate side of the calculation, our free pro rata salary calculator converts your salary and hours into a precise daily figure with all the working shown. And if you’d like the whole breakdown — annual, monthly, weekly and daily — in one place, the free pro rata salary calculator on our homepage does it in seconds.