Salary Arrears Calculator

Arrears are pay you earned in an earlier month but received later. The two common cases in Zambia are a backdated pay raise, where you were short by the increment every month between the effective date and the first payslip at the new rate, and withheld salary, where you were not paid at all for a stretch of months.

Section 21(4) of the Income Tax Act says qualifying arrears are treated "as having accrued and as having been paid during the years to which such arrears relate". In plain terms, the money is taxed back into the months it was earned in, not stacked onto the month the payment lands. That usually means less PAYE, because each month is taxed on its own gross instead of one inflated month being pushed into the top band.

No. A bonus is new money the employer decides to give you, so it belongs to the month it is paid and is taxed there. Arrears are pay you had already earned in earlier months and should have received then, which is why section 21(4) can send them back to those months. Both are emoluments and both attract PAYE - the difference is only which month the tax computation puts them in. If your payslip labels your back pay as a bonus, that is worth querying.

No, and this is the part people miss. Section 21(4) names four qualifying causes. A law, such as a statutory instrument revising a minimum wage or a public service scale. A judicial order or judgement, such as a court awarding back pay after an unfair dismissal or underpayment claim. An independent award the employer accepts, such as an arbitration or conciliation outcome. Or representations by a recognised association of employees, which is a union collective agreement settling a backdated increment. A raise your employer simply decided to backdate on its own does not obviously fall inside any of those, so payroll may tax it in the month of payment. Ask HR which basis they used before assuming you were over-taxed.

Almost always because payroll added the whole lump to one month. PAYE is progressive, so a large one-off payment climbs through the bands and a chunk of it is taxed at 37% even though your normal monthly pay never reaches that band. If your arrears qualify under section 21(4) they should have been spread across the months you earned them instead. One exception worth knowing: if your monthly gross is already above K9,200, every extra kwacha is taxed at 37% wherever it lands, so both treatments cost the same and there is nothing to query.

Yes, and they behave differently from each other. NAPSA is 5% of gross but capped at K1,861.80 a month, so a lump sum is usually already over the ceiling and attracts very little extra. NHIMA is 1% of basic pay with no ceiling, so the basic-pay portion of your arrears costs the same either way. Neither reduces the PAYE, because the employee relief was repealed with effect from 1 January 2025.

It does if your allowances are expressed as a percentage of basic pay, which is the common Zambian payslip shape. Housing at 20% of basic and transport at 10% both rise with the basic, so a 5% raise on basic is a 5% raise on your whole gross - and your arrears are larger than the increment on basic alone. Fixed-Kwacha allowances stay where they are. The calculator handles both.

It should, if you are on a contract that attracts gratuity. Section 73(1) of the Employment Code Act sets gratuity at not less than 25% of the basic pay you earned during the contract period. A backdated raise increases the basic pay you earned in those months, so the figure the gratuity is calculated on goes up with it. Arrears and gratuity are settled separately, so check the gratuity was recomputed on the corrected basic rather than the old one.

Section 66(2) of the Employment Code Act No. 3 of 2019 requires wages to be paid no later than the fifth day after they fall due, and section 66(4) requires everything additional to basic pay to be settled on the date a contract terminates. Under section 79(1)(b) an employer who fails, on demand and without reasonable excuse, to pay wages due under section 66 commits an offence.

Yes. Pay you earned does not stop being owed because the job ended. Section 66(4) of the Employment Code Act requires an employer, on termination, to pay all wages additional to basic pay - including overtime and allowances - on the date of termination, and section 66(5) makes failing to do so subject to an administrative penalty. If a backdated increase was agreed while you were still employed, the arrears for those months remain payable.

Section 21(4) relates arrears back to the charge years they belong to, so months falling in an earlier year should be recomputed on that year's bands. This calculator applies the current bands to every month in the schedule, which is right for arrears sitting inside one charge year and an approximation where they straddle a band change. If your arrears cross 1 January and the bands moved, treat the figures here as an estimate and ask payroll for the year-by-year computation.

Say your basic pay went from K7,000 to K7,350 - a 5% raise - backdated seven months. You are short K350 a month, so K350 x 7 = K2,450 gross. Spread back over the seven months under section 21(4), each month moves from K380.00 to K475.00 of PAYE, so the arrears carry K95 x 7 = K665 of tax, plus K122.50 NAPSA and K24.50 NHIMA - K812 in all, leaving K1,638 net. Taxed as one lump on top of a K7,350 month, the same K2,450 pushes you into the 37% band and the deductions come to K924, leaving K1,526. That is K112 you keep by having it treated correctly.

If your arrears qualified under section 21(4) and payroll taxed them in one month anyway, the over-deduction is a PAYE error, and the fix runs through your employer rather than around them. ZRA guidance is that where repayments exceed deductions in a month, the excess comes off the employer's later remittances, and where it cannot be recovered that way ZRA repays it on application. Take the month-by-month schedule from this calculator to payroll. ZRA can also assess you directly - operating PAYE does not stop them looking at your income.

Yes, and the detail is supposed to exist. Section 71(1) of the Employment Code Act obliges an employer to keep a record of the wages paid to each employee and of every deduction, together with the reason for it. ZRA separately requires an employer, when emoluments are paid, to notify the employee in writing of the total emoluments paid and the total tax deducted. Ask payroll for the computation rather than the total - it makes any disagreement over the month count, the allowances or the tax basis obvious straight away.