Glossary
What are salary arrears?
What salary arrears are, why a back-dated raise creates them, and how to pay them on the current month's payslip.
Updated
In short
Salary arrears are pay owed to an employee for past months, most often from a raise that takes effect from an earlier date. In SimpleERP you add arrears as their own payslip line in the current month.
Salary arrears are amounts owed to an employee for earlier pay periods that were not paid at the time. They most often arise when a raise is approved with an effective date in the past, and also from a pay error or a delayed revision. Arrears are worked out month by month as new pay minus old pay, then paid as a separate earning in the current month.
Salary arrears: a worked example
In October 2026, Harbour Steel Furniture, a fictional business paying in US dollars, raises Sam K's salary from $2,600 to $2,750 a month, effective 1 August. August and September were already paid at the old rate.
| Month | Old salary | New salary | Arrears |
|---|---|---|---|
| August 2026 | $2,600 | $2,750 | $150 |
| September 2026 | $2,600 | $2,750 | $150 |
| Total paid in October | $300 |
FAQ
Questions, answered
How are salary arrears calculated?
For each past month the new pay applies to, take the new amount of each component minus what was paid, after any unpaid days in that month. Add the months together. Components worked out as a percentage of salary follow the change.
Are pension and social security due on arrears?
Usually, because arrears are pay. Whether they count for each scheme, and in which period, depends on the local rules. Check with your accountant before the run is approved.
Are arrears taxed in the month they are paid?
In many countries arrears are taxed when paid, which can mean more tax withheld that month; some offer relief for pay that belongs to earlier years. This is not tax advice; ask your accountant.
Why doesn't SimpleERP recalculate past months after a raise?
An approved payroll run has posted its journal and its payslips are with employees, so the database freezes it. A new structure with an earlier effective date applies to runs created from now on, and the difference for past months is paid as an arrears line.
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