Shift allowance and unsocial hours pay in the UK: what it is, who decides the rate, and how to set one up

What a shift allowance is

A shift allowance is extra pay for working hours that are harder to fill: nights, early starts, late finishes, weekends, bank holidays, or a rotating pattern that changes every week. In the UK those hours are usually called unsocial hours, and the payment an unsocial hours payment or enhancement; the terms mean the same thing as shift allowance. It sits on top of the basic hourly rate or salary, either as a percentage uplift on the hours in the window, a flat amount per hour or per shift, or a fixed monthly sum for being on a shift pattern at all.

Two things it is not. It is not overtime: overtime is pay for extra hours, a shift allowance is pay for when the hours fall. And it is not required by law.

There is no statutory shift allowance in the UK

No UK law sets a rate for nights, Sundays or bank holidays. Whether a shift allowance is paid, how much, and for which hours, is a matter for the contract, a collective agreement, or the employer's policy. The written statement of employment particulars has to state the pay, including any allowances, and the terms about hours and days of work, so once it is in the contract it is enforceable.

What the law does set is the floor. Once all pay for the pay reference period is divided by the hours worked, the result must not fall below the National Minimum Wage: £12.71 an hour for 21 and over from April 2026, £10.85 for 18 to 20, £8.00 for under-18s and apprentices. A night allowance does not let the basic rate drop below that.

Two other rules touch it:

• Working Time Regulations. Night workers (at least 3 hours between 11pm and 6am on a regular basis) are limited to an average of 8 hours in 24 and are entitled to a free health assessment. The allowance does not buy exemption from either. The full list of limits is in the Working Time Regulations and your rota.
• Holiday pay. Holiday pay has to reflect normal pay. An allowance paid regularly is part of normal pay, so a worker who usually earns a night uplift is owed it on holiday too. Basic rate only is an underpayment.

The three ways to structure it

Percentage uplift on the hours in the window. Say 20% on hours between 10pm and 6am. Simple to explain, scales with pay rises, fiddly on a shift that straddles the boundary.

Flat amount per hour or per shift. Say £1.50 an hour after 10pm, or £15 for any shift finishing after midnight. Easier for payroll, does not move with the basic rate.

Fixed monthly allowance for being on the pattern. Common for permanent nights or rotating shifts in manufacturing and care. Predictable for both sides; unfair if the rota stops giving that person the unsocial hours.

The percentages and amounts above are illustrations, not market rates. Sector agreements (the NHS Agenda for Change unsocial hours enhancements are the best known) set their own figures, and a business outside such an agreement is free to pick its own.

Worked example

Amy works 6pm to 2am with a 30-minute unpaid break, so 7.5 paid hours, at £12.71. The policy gives 20% on hours from 10pm.

• Hours in the window: 10pm to 2am = 4 hours.
• Uplift: 4 × £12.71 × 20% = £10.17.
• Pay for the shift: 7.5 × £12.71 = £95.33, plus £10.17 = £105.50.

With a flat £1.50 an hour after 10pm instead: 4 × £1.50 = £6.00, so £101.33 for the shift.

If Amy does this shift three nights a week for a year, the uplift is part of her normal pay, and her holiday pay must include it.

Tax and National Insurance

A shift allowance is earnings. It goes through PAYE, with income tax and Class 1 National Insurance deducted like basic pay, and it counts for pension contributions under the scheme's definition of pensionable pay. Paying it as an untaxed "expense" is a payroll error, not a saving.

Writing the policy so it does not cause arguments

1. Define the window by clock time, not by shift name. "Hours worked between 22:00 and 06:00", not "night shifts".
2. Say what happens to straddling shifts. Per hour in the window, or the whole shift if it ends after a set time.
3. Say whether breaks in the window are paid at the uplifted rate.
4. State the method: percentage of basic rate, flat amount, or fixed monthly, and when it is reviewed.
5. Cover bank holidays and Sundays separately if they are treated differently from nights.
6. Put it in the written statement and apply it the same way to everyone on the same terms.

What this means for the rota

An allowance is only as accurate as the hours behind it. Payroll needs, per person and per shift, the start, the finish, the break and which of those hours fell inside the window. A rota that says "late" does not give that; one that says 18:00 to 02:00 with a 30-minute break does. Recording the actual clock-in and clock-out matters too: if Amy stayed until 2:30 because a delivery was late, the extra 30 minutes are inside the window.

The rota planner keeps shift times to the minute and exports the hours; the free rota templates do the weekly totals if you would rather stay in a spreadsheet. What a shift costs the business once the allowance, holiday and employer National Insurance are added: the UK employee cost calculator. Related: time off in lieu, the other common way of compensating unsocial or extra hours.

*Sources: gov.uk, National Minimum Wage rates from April 2026; gov.uk, "Night working hours"; Acas, overtime and holiday pay guidance. General information, not legal advice; check your contracts and any collective agreement.*