Annualised-hours contracts: how do they work?
Busy weeks need not mean an unpredictable basic salary. What matters is the annual total, how reserve hours are called in and when extra work earns extra pay.
Your annual-hours contract is meant to guarantee a yearly total, not leave you guessing what next week’s pay will be. If the rota or payslip does not match, save both today and write down every shift you actually worked. A smoothed salary can steady your income, but only if the contract protects the hours and pay you are owed.
- 1,872 h
- example annual basic hours, 36 × 52
- £12.71
- hourly minimum, age 21+, from 1 April 2026*
- 48 hrs
- usual adult weekly average limit, including overtime
- 5.6 wks
- standard full-year statutory paid holiday entitlement
*The apprentice rate can apply instead. The wage bands and exceptions are explained below.
What “annualised hours” means
You agree a number of hours for the year, with flexibility about when you work them. Acas describes annualised hours as a type of flexible working. The arrangement comes from your contract, not a separate annualised-hours law.
“Contracted hours” means the hours you have agreed to work. In an annualised scheme, that is a yearly figure. A contract might use 1,872 annual basic hours, calculated as 36 × 52, or a smaller part-time total. Ask whether that figure includes paid holiday hours or describes only the hours you must actually work. The distinction matters when you compare the rota with your entitlement to leave.
Unlike a zero-hours arrangement, you have an agreed annual commitment. With a fixed annual salary, a quiet month does not itself reduce your basic pay. Annualised hours and salary smoothing are separate contract terms, so check that your agreement provides both.
How the pattern works in practice
A scheme may split your annual total into two parts:
- Rostered hours. Shifts set in advance for the year or season.
- Reserve hours. Hours left unallocated until your employer needs them, subject to the agreed notice. If a 1,872-hour total contains 1,650 rostered hours, the remaining 222 are reserve hours.
Reserve hours are part of the annual total, not automatically unpaid overtime. Your salary may already cover them. The contract should explain how your employer calls them in and what happens to unused hours at year-end. Do not assume they can be carried into the next year, or that a quiet year creates a debt you must repay.
Pay smoothing: why your pay stays flat
Salary smoothing divides your annual salary into regular instalments instead of paying for that month’s actual shifts. Your contract must provide for it.
For minimum-wage purposes, “salaried hours work” requires an annual salary for identifiable annual basic hours. Where practicable, instalments must be equal and paid between weekly and monthly. Variable monthly instalments can also qualify if each quarter totals the same amount. Performance bonuses, salary premiums and extra-hours payments can be compatible with this category.
Example: Sofia’s smoothed salary
Sofia’s 1,872 annual basic hours at £14.50 give a salary of 1,872 × £14.50 = £27,144. Divided by 12, that is £2,262 a month. Her rota has 195 hours in December and 118 in February. Both months pay £2,262, assuming no absence deductions or extra payments.
Checking the minimum-wage floor
For straightforward monthly-paid salaried-hours work, payroll normally allocates one twelfth of the annual basic hours to each month’s minimum-wage check. December’s long rota is not the denominator. Excess hours and relevant deductions can change the calculation.
From 1 April 2026, the minimum hourly rates are £12.71 for workers aged 21 and over, £10.85 for ages 18 to 20, and £8.00 for under-18s who have reached school-leaving age. The £8.00 apprentice rate applies if you are under 19, or aged 19 or over in the first year of your apprenticeship. After that first year, apprentices aged 19 or over must receive their age-band rate.
When overtime starts and what it pays
Your contract sets the overtime trigger. It may promise extra pay after the annual total, a daily or weekly limit, or for work outside the roster. Having annual hours left does not automatically rule out overtime.
There is no statutory right to an overtime premium or a separate payment for every extra hour. You must receive the pay your contract promises, and your pay must meet minimum-wage law.
Example: an annual overtime trigger
Dan’s contract requires 1,950 working hours in its annual roster and promises £14.50 for each additional hour. In week 42, he reaches 1,950 and works another 20 hours. He earns 20 × £14.50 = £290 of contractual overtime in that week, not only from week 43.
| Situation | Contractual overtime | What to check |
|---|---|---|
| A 58-hour week within the annual total | Depends on any daily or weekly trigger | The overtime clause, weekly average and rest |
| Reserve hours within the annual total | Usually covered by basic salary in a smoothed scheme | Agreed notice and any separate premium |
| Hours beyond the annual total | Payable if the contract provides for it | Contractual rate and the minimum-wage excess-hours calculation |
Minimum-wage excess hours are a separate calculation
Ask payroll for the dates of your minimum-wage calculation year. HMRC’s annual count includes relevant hours treated as worked, including paid absence within the basic hours. It can differ from your shift record. Separately paid overtime is handled differently from extra work covered only by salary.
Once the basic-hours threshold is exceeded, additional hours enter the minimum-wage calculation. Payroll must check qualifying pay against the enlarged hours figure for that pay period. An above-minimum salary may absorb some extra hours before a top-up is needed. There is no automatic separate £12.71 payment on top of an already sufficient salary.
Example: when the salary needs a top-up
Sofia has exceeded her basic-hours threshold before the final month of the calculation year. She then works 30 further hours, with no separate overtime payment, other relevant pay, absence or deductions. Her monthly basic-hours allocation is 1,872 ÷ 12 = 156. Minimum-wage hours are 156 + 30 = 186. At the £12.71 adult rate, she needs 186 × £12.71 = £2,364.06 of qualifying pay. Her £2,262 salary leaves a £102.06 shortfall. Any higher contractual overtime entitlement must also be honoured.
Holiday and an “annualised hours allowance”
“Annualised hours allowance” has no single meaning in these rules. Ask payroll whether it means remaining annual hours, a holiday balance or a separate payment.
The standard full-year statutory entitlement is 5.6 weeks of paid holiday, capped at 28 days. For a five-day worker, that is 28 days. GOV.UK’s annualised-hours guidance discusses keeping leave in weeks and taking it in planned non-working periods. A gap in the rota is not automatically holiday. The newer irregular-hours rules may apply instead.
When the 12.07% rules apply in Great Britain
Under the holiday reforms, an irregular-hours worker’s paid hours in each pay period must be wholly or mostly variable under the contract. A fixed rotating pattern is not enough. Part-year workers must have non-working periods of at least a week for which they are not paid. Receiving smoothed pay during a quiet week does not settle whether it is payment for that week.
For qualifying workers, statutory leave accrues at 12.07% of hours worked per pay period for leave years beginning on or after 1 April 2024. Rolled-up holiday pay is a separate, optional payment method. It does not replace time off.
Example: leave accrual and rolled-up pay
A qualifying worker with statutory-minimum leave works 150 hours in a monthly pay period. 150 × 12.07% = 18.105 hours, rounded to 18 hours of leave. Fractions below 30 minutes round down; 30 minutes or more round up. If the employer uses rolled-up pay on £2,100 of earnings, the addition is £2,100 × 12.07% = £253.47. It must be additional to normal pay and separately itemised.
Without rolled-up pay, qualifying workers’ holiday pay generally uses the previous 52 paid weeks. Outside those categories, four weeks of statutory leave must reflect normal pay, including regularly paid overtime; the remaining 1.6 weeks can be paid at basic pay.
Your legal protections on uneven shifts
The annual total is not permission to average your working time over a whole year. Under the Working Time Regulations 1998, the usual reference period for the 48-hour weekly limit is 17 weeks. Some categories use 26 weeks. A collective or workforce agreement can extend the period up to 52 weeks; your individual annualised contract does not do that by itself.
| Rule | Usual entitlement or limit |
|---|---|
| Average week, including overtime | No more than 48 hours over the applicable reference period, unless a valid opt-out applies |
| Daily rest | 11 consecutive hours in each 24-hour period |
| Weekly rest | 24 uninterrupted hours in each 7 days, or 48 in each 14 days |
| In-work break | At least 20 uninterrupted minutes if the working day exceeds 6 hours |
| Night work | No more than 8 hours on average in each 24-hour period; no individual opt-out |
These are the standard adult rules, not a complete statement of the rules for every occupation or shift arrangement. Annualised hours do not themselves remove rest or night-work protections.
If you are 18 or over and eligible, you can voluntarily opt out of the 48-hour average in writing. You can withdraw on seven days’ notice unless the agreement sets a longer period, up to three months. Your employer must not penalise you for refusing. An opt-out does not waive holiday, rest or night-work rights.
Example: a peak week within the average
One 58-hour week followed by sixteen 40-hour weeks totals 58 + 640 = 698 hours. Divided by 17, that is 41.06 hours a week. That average is below 48, but each shift still needs to comply with the applicable rest rules. This simplified example assumes no leave or other absences affect the reference-period calculation.
Annualised hours vs zero-hours
Annualised hours
- An agreed yearly total
- Predictable basic income if the salary is smoothed
- Reserve shifts only under agreed contract terms
- Overtime triggers and rates set by the contract
Zero-hours
- No guaranteed work under the arrangement
- Income can vary with the work offered and accepted
- Check whether you are obliged to accept a shift
- Minimum wage and paid leave still apply to workers
A seasonal business can use annualised hours to schedule more of its existing workforce during peaks instead of relying entirely on extra hires. For you, a smoothed salary can make quiet months affordable. Neither advantage is worth much if the reserve clause leaves you unable to plan childcare or take another job.
Compare the maximum busy-week commitment, the notice you get and the dates you can take holiday. A steady salary may come with long peak-season weeks. The trade-off is predictable income against less control over when you work, not a guarantee that every annualised scheme is better than zero-hours work.
Can your employer demand reserve at short notice?
The reserve clause decides how much notice your employer must give and whether you must accept the shift. There is no general statutory minimum notice specifically for calling annualised reserve hours. The contract still has to operate within applicable working-time and other employment protections. If you cannot work a proposed shift, raise the conflict promptly rather than assuming you can refuse without consequences.
The Employment Rights Act 2025 provides for new shift-notice and short-notice payment rights, but those substantive rights are not in force as at 1 October 2026. Do not rely on the planned reforms to resolve a current rota dispute. Keep records of shifts offered, worked, changed and cancelled, alongside the notice you received.
Check your contract in five steps
- Find the annual total and its dates. Check whether paid leave sits inside or outside the figure. Ask whether the contract year and minimum-wage calculation year match.
- Read the reserve clause. Find the rostered/reserve split, notice, maximum shift or week, and any right to decline.
- Test the pay. If salary is paid in twelve equal instalments, annual salary ÷ 12 should match basic monthly pay. Ask payroll to explain the minimum-wage hours and the rate that applies to you.
- Check the overtime and year-end rules. Identify each payment trigger, its rate, how unused reserve is treated, and how hours and pay are reconciled if you leave mid-year.
- Check leave and rest. Find the holiday method and the working-time reference period. Compare the busiest rota with your applicable breaks and rest entitlements.
If the figures do not add up, write to payroll today: give the dates, hours and amount missing, and ask for the calculation in writing. Keep a copy. Report minimum-wage underpayment to HMRC. For a dispute that may go to tribunal, contact Acas about early conciliation now; do not let an internal grievance consume the time limit. Citizens Advice and a law centre can help you work out the next step. A union can act with you: UNISON in care or health, Unite in hospitality, USDAW in retail, and GMB in warehouses or delivery. Report unsafe hours or denied rest to the HSE; suspected labour exploitation in covered sectors to the GLAA; and discrimination to the EHRC.
Your employment status still matters
Annualised hours describes a working pattern, not your legal status. Employees and other workers have minimum-wage and working-time rights. Employees have additional protections, including unfair-dismissal rights when the qualifying conditions are met. Genuinely self-employed people are outside these employment protections. The reality of the arrangement, not its label, determines status.
Reforms that affect annualised contracts
The government’s implementation timetable distinguishes changes already introduced from those planned for 2027. Future dates remain subject to parliamentary processes.
- Fair Work Agency established
The new enforcement body has been established. Salary smoothing does not alter your employer’s duty to comply with minimum-wage law.
- Tribunal time-limit extension introduced
The government timetable records the extension from three to six months. For breach-of-employment-contract claims in Scotland, it gives 9 November 2026 instead. Check the deadline and transitional rules for your particular claim; do not assume an older dispute gets a fresh six months.
- Shorter unfair-dismissal qualifying period
The timetable schedules a six-month qualifying period for dismissals from this date. This is an employee protection, not a right acquired merely by having annualised hours.
Scotland and Northern Ireland
Scotland shares the Great Britain framework for annualised hours, minimum wage and working time. The separate Scottish date for the tribunal contract-claim deadline change is noted above.
Northern Ireland has its own Working Time Regulations (Northern Ireland) 2016. The usual 48-hour average and adult rest figures are similar, and minimum wage is UK-wide. The Great Britain guaranteed-hours and shift-notice reforms do not extend to Northern Ireland. Nor should you apply the Great Britain 2024 holiday reforms there without checking the Northern Ireland rules. Use the Labour Relations Agency for employment advice and HSENI for working-time enforcement guidance. See nidirect on working-time limits and overtime.
Questions people ask
Does annualised hours mean equal pay every month?
Only if your contract provides for equal monthly salary instalments. That is a common way to smooth pay, but the annual-hours label alone does not promise it. Bonuses, premiums, extra hours and lawful absence adjustments can also change a payslip.
Can a busy week count as overtime before the annual total is reached?
Yes, if your contract has a weekly, daily or other overtime trigger. If it only promises extra pay after the annual total, hours within that total may be covered by salary. Minimum-wage compliance is a separate question.
Do all annualised-hours workers accrue holiday at 12.07%?
No. In Great Britain, that method applies to workers who meet the legal irregular-hours or part-year definition, for leave years beginning on or after 1 April 2024. A fixed rotating pattern is not irregular merely because successive weeks differ.
Can a single week exceed 48 hours?
For an adult covered by the standard rules, 48 hours is an average over the applicable reference period, not a limit on every week. Rest and night-work rules still matter, and a valid voluntary opt-out affects only the weekly average limit.
Can unused reserve hours be carried into next year?
Check the contract and any agreement governing the scheme. Do not assume unused hours become next year’s obligation or justify a wage deduction. Ask your employer to identify the term it relies on before accepting either.
What if I leave before the annual year ends?
Ask for an itemised reconciliation of hours, salary, overtime and holiday. Peak-season work can leave your hours ahead of the salary paid so far; a quiet-season departure can produce the opposite. The contract and applicable wage and holiday rules determine the result, not a simple assumption that either side owes the entire remaining annual total.
Sources
- Types of flexible working, Acas
- Working Time Regulations 1998, regulation 4, legislation.gov.uk
- National Minimum Wage Regulations 2015, regulation 21, salaried hours work, legislation.gov.uk
- National Minimum Wage Regulations 2015, regulation 26, counting excess hours, legislation.gov.uk
- National Minimum Wage Regulations 2015, regulation 28, hours after the annual basic-hours threshold, legislation.gov.uk
- Salaried hours work, general approach, NMWM08020, HMRC
- Excess hours in the calculation year, NMWM08110, HMRC
- Maximum weekly working hours, GOV.UK
- Overtime: your rights, GOV.UK
- National Minimum Wage and National Living Wage rates, GOV.UK
- Calculating holiday entitlement for workers on different contracts, GOV.UK
- Holiday pay and entitlement reforms from 1 January 2024, GOV.UK
- Employment Rights Act 2025, legislation.gov.uk
- Plan to Make Work Pay and Employment Rights Act: timeline update, GOV.UK
- Working time limits, the 48-hour week, nidirect
- Overtime, nidirect
- Over 370,000 workers were underpaid in April 2024, Low Pay Commission
- National Minimum Wage: 2024 to 2025 Enforcement and Compliance Report, HMRC and Department for Business and Trade
- Key statistics, Living Wage Foundation