How to Process Salary Arrears: Calculation and Steps

Salary arrears are the amount owed to an employee for past months when their pay was lower than it should have been: a back-dated increment, a revision approved late, a missed allowance, or attendance corrected after payroll. Paying them correctly means working out the difference month by month, component by component, and checking the statutory contributions that go with it. This guide shows the calculation with an example, the statutory points to check, and the steps to pay and record arrears cleanly.

Common causes of arrears

Arrears arise whenever the salary paid in a past month turns out to be lower than what was due. The cause decides how the arrears are calculated and who approves them, so record it with every arrears line in payroll rather than a bare amount.

Increments approved in June but effective from April.
A promotion or revised salary structure with a back date.
An allowance or shift payment missed in earlier months.
Attendance corrected after the month's payroll was finalized.
A change in wage rates notified by the state with a past effective date.

Worked example: a back-dated increment

Anil, an accounts officer in Bhopal, has a monthly gross of ₹40,000: basic ₹20,000, HRA ₹8,000 and special allowance ₹12,000. In June 2026 the company approves an increment to ₹44,000 effective 1 April 2026: basic ₹22,000, HRA ₹8,800 and special allowance ₹13,200. The new salary is paid from June, so April and May are owed. Arrears per month = ₹44,000 minus ₹40,000 = ₹4,000, made up of ₹2,000 basic, ₹800 HRA and ₹1,200 special allowance. For the two months, arrears = ₹8,000. If he had LOP days in April or May, work out that month's arrears on his paid days only, on the same basis used in the original payroll.

Statutory contributions on arrears

Arrears relate to past months, so check how the PF and ESI rules apply to them for those months, including any wage ceiling in force at the time, before you pay. The EPF applicability rules and your adviser settle the treatment. Show the arrears as a separate earning with the months they relate to, and keep the working sheet, so each contribution can be traced back to the month it belongs to. Income tax on arrears is handled in your tax computation, outside the payroll inputs described here.

Paying and recording arrears

Pay arrears in the next regular payroll, or in an off-cycle run if the amount is large or the employee has left. Label the line clearly, such as Arrears April to May 2026 (increment), so the employee does not mistake it for a bonus. Update the salary record so the revision and its effective date are on file, and make sure later months use the new salary. For a leaver, arrears belong in the full and final settlement. Avoid paying arrears as a round figure agreed over email; the month-wise calculation is what you will need if anyone asks.

Step by step

Record the revision and effective date. Update the employee's salary with the new structure and its back date. ZeniaHR keeps salary revisions in the employee's lifecycle history alongside transfers and promotions.
List the months owed. Identify each past month from the effective date to the last month paid at the old rate.
Calculate the difference per component. For each month, subtract what was paid from the revised amount, component by component, using that month's paid days.
Check statutory contributions. Work out how PF and ESI apply to the arrears for the months concerned, with your adviser or the scheme rules.
Add arrears as a payroll input. Enter the total as a separate earning with a clear label. In ZeniaHR, arrears are one of the monthly payroll input earnings in Direct Payroll.
Review and pay. Review the arrears with the rest of the payroll, then pay them in the next run or an off-cycle run. ZeniaHR supports off-cycle runs for payments that cannot wait.
Keep the working sheet. Store the month-wise calculation with the payroll records, so the arrears can be explained to the employee or an auditor later.

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Frequently asked questions

What are salary arrears?

Salary arrears are the amount owed to an employee for past months when they were paid less than was due, most often because an increment or revision was approved after its effective date. They are worked out month by month as the difference between the revised and paid salary, and paid as a separate earning.

How do you calculate arrears of salary?

For each month from the effective date to the last month paid at the old rate, subtract the salary paid from the revised salary, component by component, using that month's paid days. For an increment from ₹40,000 to ₹44,000 effective two months back, the arrears are ₹4,000 a month, ₹8,000 in total.

How are PF and ESI handled on salary arrears?

Arrears relate to past months, so check how the PF and ESI rules apply to them for those months, including any wage ceilings in force at the time. Work it out with your adviser or the scheme rules before paying, and show the arrears with the months they relate to so each contribution can be traced.

When should salary arrears be paid?

Pay them in the next regular payroll after the revision is approved, or in an off-cycle run if the amount is large or the employee is leaving. For a leaver, include the arrears in the full and final settlement, and tell the employee the amount and months covered before the payslip arrives.