Unpaid Leave Salary Impact Calculator UK
Estimate how unpaid leave changes gross pay for a month, week or pay period, and run a simple National Minimum Wage sense check.
Enter Pay Period And Absence Details
Gross Pay Impact
Estimated gross deduction before tax, National Insurance, pension or student loan effects.
Why Payroll Method Matters
There is not one universal UK formula for unpaid leave deductions from salary. Payroll teams usually follow the employment contract, staff handbook, collective agreement, written unpaid leave approval, or a consistent payroll policy. Some employers divide monthly salary by the working days in that pay period. Others use calendar days, a fixed 260 working-day year, a 365-day annual method, or the employee’s contracted hourly rate. Those methods can produce different deductions for the same two days of absence.
This calculator gives three practical methods so you can compare the amount that may appear on a payslip. It is a gross-pay planning tool only. It does not calculate take-home pay after PAYE, National Insurance, pension, student loan, attachment of earnings, salary sacrifice or benefits. It also does not decide whether unpaid leave has been authorised, whether a deduction is lawful, or whether holiday, sick pay, parental leave or another statutory right should have applied instead.
Deduction Formulas Used
Working-Day Method
Pay-period salary = annual salary / pay periods per year.
Daily deduction = pay-period salary / working days in pay period.
Total deduction = daily deduction x unpaid leave days.
Calendar-Day Method
Pay-period salary = annual salary / pay periods per year.
Daily deduction = pay-period salary / calendar days in pay period.
Total deduction = daily deduction x unpaid leave days.
Hourly Method
Unpaid hours = unpaid leave days x paid hours per work day.
Total deduction = unpaid hours x contracted hourly rate.
Remaining gross pay = pay-period salary – total deduction.
Minimum Wage Sense Check
The National Minimum Wage and National Living Wage rules are separate from a simple salary deduction. A salaried employee can have a deduction that looks arithmetically correct but still needs a payroll check if the amount left for hours actually worked risks falling below the applicable minimum wage. This calculator uses a simple pay-after-deduction divided by hours-worked check. It is not a full minimum wage audit because some payments, deductions, accommodation, salary sacrifice and working-time rules can change the calculation.
| Rate from April 2026 | Hourly rate | Use in this calculator |
|---|---|---|
| National Living Wage, 21 and over | £12.71 | Default check for adult workers. |
| 18 to 20 rate | £10.85 | Use for eligible workers in that age band. |
| 16 to 17 rate | £8.00 | Use for eligible younger workers. |
| Apprentice rate | £8.00 | Use only where the apprentice rate applies. |
Worked Payroll Examples
A salaried employee earns £32,000 a year and is paid monthly. Their monthly gross pay is £2,666.67. If they take two unpaid leave days in a month with 22 working days, the working-day deduction is about £242.42, leaving gross pay of about £2,424.25 before payroll deductions. If the employer used a 30-day calendar method instead, the deduction would be about £177.78. The difference is why the written payroll method matters.
For an hourly method, suppose the employee’s rate is £16.41 and a normal day is 7.5 paid hours. Two unpaid leave days equal 15 unpaid hours, so the gross deduction is £246.15. That is close to the working-day example but not identical. If the employee worked fewer hours in the period, the minimum wage check becomes more important because it divides pay left after the deduction by the actual worked hours entered.
Before You Rely On A Payslip Estimate
Check whether the absence is truly unpaid leave. Annual leave, statutory sick pay, contractual sick pay, maternity, paternity, adoption, shared parental leave, carer’s leave, dependants’ leave and authorised unpaid leave can have different rules. Check whether the employer deducts by working days, calendar days, contracted hours or an annual-day divisor. If the deduction looks wrong, ask payroll for the formula and the pay-period figures used. Keep the written approval for unpaid leave beside the payslip because it helps explain later questions about pensionable pay, benefits, bonus targets or absence records.
Payslip Reconciliation Checklist
When the payslip arrives, compare three figures: normal gross pay for the period, the unpaid leave deduction, and the taxable gross pay after deduction. If the deduction line is not clear, ask payroll whether it used working days, calendar days, a fixed annual-day divisor, or contracted hours. Then compare the unpaid leave dates with the absence record. A common mismatch is counting a bank holiday, rest day or half day incorrectly.
Also check whether pension, salary sacrifice, overtime, commission, bonus, car allowance or shift premium has been affected. Those items can sit outside the basic daily deduction, yet they may change the amount paid. If the deduction is large, ask for the minimum wage calculation covering the pay reference period, especially where hours were irregular.
FAQ
Is unpaid leave deducted before or after tax?
The deduction normally reduces gross pay first. PAYE and National Insurance are then calculated by payroll on the lower pay figure, but this calculator does not model net pay.
Which method is correct for a monthly salary?
The correct method depends on the contract, policy or agreement. Working-day and calendar-day methods are both seen in payroll practice, so ask for the method used by your employer.
Can unpaid leave affect pension contributions?
It can. If pension contributions are percentage based, lower pay may reduce contributions. Salary sacrifice, defined benefit schemes and employer rules need a separate pension check.
Why include a minimum wage check?
Large deductions, low pay or unusual hours can create a minimum wage risk. The check is a warning flag only and does not replace payroll or legal advice.
Can my employer deduct pay for unpaid leave without written approval?
That depends on the facts, contract and employment law position. If you dispute a deduction, ask for the written basis and consider advice from ACAS, a union or an employment adviser.
Does unpaid leave reduce holiday entitlement?
It can depend on the contract and the leave type. Statutory holiday rules and contractual holiday accrual are separate from the gross salary calculation shown here.
Sources
- Low Pay Commission. (2025). Minimum Wage Rates for 2026. GOV.UK. https://www.gov.uk/government/publications/minimum-wage-rates-for-2026
- HM Revenue & Customs. (n.d.). Calculating the Minimum Wage. GOV.UK. https://www.gov.uk/guidance/calculating-the-minimum-wage/calculating-the-minimum-wage
- Advisory, Conciliation and Arbitration Service. (n.d.). Pay and Wages. ACAS. https://www.acas.org.uk/pay-and-wages