“Paid in arrears” is a term that appears in employment contracts, utility bills, mortgage agreements, and supplier invoices across the UK yet many people are uncertain about exactly what it means and how it affects them practically. Whether you are a new employee wondering when your first pay cheque will arrive, an employer designing your payroll cycle, or a business managing supplier payments, understanding what paid in arrears means and distinguishing it from a late payment is essential. This comprehensive AccFirm guide explains arrears payments in every key UK context for 2026.
What Does “Paid in Arrears” Mean?
“Paid in arrears” means making a payment after a good or service has been delivered or after a work period has been completed rather than paying in advance before delivery. The word “arrears” comes from the Old French “ariere,” meaning “behind” or “in the rear.” In a payment context, you are paying for something that has already happened.
This is the opposite of “paying in advance” or “paying in current” where payment is made before or at the same time as the service is provided. Paying in arrears is the standard for the vast majority of UK employment, utility billing, and B2B commercial transactions.
Crucially: being paid in arrears does not mean a payment is late. A payment is only late if it is not made by the agreed due date. If your contract states you will be paid monthly in arrears and you receive payment on the last working day of each month, those payments are on time they are simply made after the work period to which they relate.
Paid in Arrears vs Paid in Advance: Key Differences
| Feature | Paid in Arrears | Paid in Advance |
| Timing | Payment made after work/service completed | Payment made before work/service begins |
| Common for | Employee salaries, utility bills, invoices | Rent, retainers, subscriptions, insurance |
| Accuracy | Based on actual hours/usage very accurate | Based on estimates adjustments may be needed |
| Cash flow (payer) | Better cash retained longer | Worse cash released upfront |
| Cash flow (recipient) | Worse wait for payment | Better cash received early |
| Risk | Payer has received service before paying | Recipient delivers service before being paid |
Paid in Arrears in UK Payroll
The vast majority of UK employees are paid in arrears. Monthly salaried workers typically receive their salary at the end of the month for the month just completed. Weekly paid workers receive their wages at the end of the working week for the week just worked. This is confirmed by the Office for National Statistics (ONS), which reports that monthly arrears payroll is the most common payment structure across UK employment sectors.
Why Most UK Employers Pay in Arrears
- Accuracy: Paying after the period means you use real data actual hours worked, actual overtime, actual sick days taken. No estimation is needed.
- Statutory payments: Statutory Sick Pay (SSP), Statutory Maternity Pay (SMP), and Statutory Paternity Pay (SPP) are all calculated based on qualifying days that have already occurred they must be paid in arrears.
- Payroll compliance: HMRC’s RTI (Real Time Information) system requires a Full Payment Submission (FPS) to be submitted on or before each payment date. Arrears payroll aligns naturally with this requirement.
- Variable pay: Commissions, tips, bonuses, and variable hours are impossible to calculate in advance. Arrears payroll accommodates all variable pay elements.
- Cash flow: Retaining cash until the end of the pay period improves the employer’s cash flow position.
What Arrears Payroll Means for New Starters
New employees are often surprised by how arrears payroll works in practice. If you start a job on 1 June and your employer runs monthly arrears payroll with a pay date of the last working day of each month:
- June 1–30: You work your first full month
- Last working day of June (e.g. 28 June): You receive your first salary payment covering the full month of June
- You have effectively worked the entire month before receiving any pay
If you start mid-month (e.g. 15 June) and the payroll cut-off date has already passed, your June earnings may be rolled into July’s payroll, meaning your first payment arrives at the end of July. This is a common source of confusion for new starters. Always check the payroll cut-off date with your HR or payroll team when starting a new role.
Paid in Arrears for Different Payment Types
Salaries and Wages
Monthly salary: Paid at the end of the month for work performed in that month. Weekly wages: Paid at the end of the week for work performed in that week. Fortnightly: Paid every two weeks for the two weeks just worked.
Utility Bills
Gas, electricity, and water bills in the UK are almost always charged in arrears you use energy throughout the month and are billed afterwards based on actual consumption (or estimated if a meter reading is not submitted). This is why utility providers sometimes ask for a meter reading before billing to calculate the exact amount owed for the period just ended.
Mortgage Payments
UK mortgage payments are typically paid in arrears you pay at the end of each month for the interest that accrued during that month. This is why your first mortgage payment is usually due one full month after the mortgage starts, not on the day of completion.
State Pension
The UK State Pension is paid in arrears you receive payment for a period that has already passed. It is paid every four weeks (28 days), covering the four weeks just completed. This is the subject of a related AccFirm blog on whether the State Pension is paid in arrears.
Business-to-Business Invoices
In B2B transactions, standard practice is payment in arrears the supplier delivers goods or services, raises an invoice with payment terms (typically 30 days), and the buyer pays after receiving and verifying the delivery. This aligns with the Late Payment of Commercial Debts (Interest) Act 1998, which assumes payment after supply.
Salary Arrears: When Arrears Means Overdue Payment
In a specific and important context, “salary in arrears” can mean something different it refers to pay that is overdue. If an employer fails to pay wages on the agreed payday, the unpaid amounts become “arrears” in the sense of overdue obligations. This is a legal issue:
- The Employment Rights Act 1996 makes it illegal for an employer to make unauthorised deductions from wages or to withhold pay
- Employees can bring an unlawful deduction from wages claim to an Employment Tribunal compensation up to £25,000 is available
- HMRC’s National Minimum Wage enforcement team investigates employers who fail to pay the NMW on time
- Persistent late payment of wages can be treated as a fundamental breach of contract, entitling the employee to resign and claim constructive dismissal
Tax Treatment of Arrears Payments
Income Tax and National Insurance on salary arrears are calculated based on the tax year in which the payment was originally due not the tax year in which it is eventually paid. This is confirmed by HMRC’s PAYE guidance. If an employer pays January 2026 wages in April 2026 (spanning two tax years), the tax must still be accounted for under the 2025/26 tax year in which the wages were due.
HMRC RTI and Arrears Payroll
Under HMRC’s Real Time Information system, employers must submit a Full Payment Submission (FPS) on or before the date employees are paid even when operating arrears payroll. The FPS contains details of each payment including gross pay, tax deducted, and National Insurance. Failure to submit FPS on time results in late filing penalties from HMRC.
Frequently Asked Questions: Paid in Arrears UK
Does paid in arrears mean I won’t get paid for a month?
Not exactly. If paid monthly in arrears, you will receive your first payment at the end of your first full month. You do work the month before receiving payment, but thereafter you are paid at the end of each month. The initial wait is the main practical impact.
Is it legal for an employer to pay weekly in arrears?
Yes paying weekly in arrears is entirely legal. The employer must pay on the agreed payday, at the agreed frequency, and at or above the National Minimum Wage rate. The payment method (in arrears) is separate from whether it complies with employment law.
What is the difference between paid in arrears and in hand?
A “week in hand” or “month in hand” means the employer holds back one pay period’s wages you work your first period but do not receive payment until the end of your second period. Being paid simply “in arrears” without an “in hand” arrangement means you are paid at the end of each period for that period’s work.
Can mortgage interest be paid in advance?
Most standard UK residential mortgages charge interest in arrears. Some specialist mortgage products, particularly commercial mortgages or certain buy-to-let products, may charge interest in advance always check your mortgage terms.