There is a particular quiet in a small business between the last payslip of August and the first week of October. Payroll has run, the monthly returns went off on time, nobody is chasing anything. It is also, for any employer claiming the Employment Tax Incentive, the window in which a refund can quietly stop being a refund.
According to the South African Revenue Service, the Employer Interim Reconciliation submission period runs from 21 September to 31 October 2026, and covers the six months of payroll from 1 March 2026 to 31 August 2026. Every employer registered for PAYE has to file one. Most know that. Rather fewer have worked out which parts of it cost money to get wrong.
What is actually being reconciled
The EMP501 is a reconciliation in the ordinary accounting sense: three separate records have to agree with each other before SARS will accept it. The first is what you declared each month on your EMP201 returns for PAYE, UIF and the Skills Development Levy. The second is what you actually paid across to SARS. The third is the sum of the interim IRP5 and IT3(a) tax certificates generated for every person on your payroll over those six months.
When the three do not match, and they frequently do not, the mismatch is usually mundane. A payroll correction made in month four that was never carried into the monthly return. A leaver whose final payment ran through the wrong period. A directors’ remuneration adjustment booked to the wrong month. None of it is exotic and all of it has to be found now rather than in the annual reconciliation, when there is a full year of it to unpick.
Submission runs through e@syFile Employer, or through eFiling for employers with no more than 50 certificates per submission. SARS has said it plans to release the updated e@syFile Employer build for this interim period in mid-September, which is worth knowing for the practical reason that filing on an old version is a well established way to waste an afternoon.
The ETI money, which is the part that hurts
The Employment Tax Incentive is a subsidy paid to employers who hire younger, lower earning workers, delivered as a reduction in the PAYE the employer hands over each month. Where the incentive earned exceeds the PAYE owed, the balance is not lost automatically. It accumulates as an unused ETI amount, and SARS refunds it.
It refunds it, however, only through the reconciliation. SARS states on its own ETI refund process page that unused ETI amounts can only be claimed by submitting the interim and annual EMP501 reconciliations, and that failing to do so forfeits the refund. There is a second condition attached: the refund is paid only if the employer is tax compliant when the reconciliation is processed, meaning every return is in and there is no outstanding tax debt.
So for a small employer with an unused ETI balance and an unrelated VAT return sitting unfiled, the two problems are now the same problem. The reconciliation is not a piece of administration that sits alongside the money. It is the mechanism by which the money is claimed.
One further trap is worth naming because it cannot be fixed at reconciliation stage. Where ETI was under claimed or not claimed on a monthly EMP201 return, the shortfall has to be corrected in a month within the same reconciliation period. It cannot simply be added to the EMP501 at the end. An employer who realises in October that they under claimed in April has, in most cases, already lost it.
The change that will reject your submission
The technical specification behind PAYE filing, the Business Requirements Specification, moved to version 25.3.0 in May 2026, and the direction of travel in it is towards employee income tax numbers being validated rather than accepted. SARS has said that missing or invalid income tax numbers may delay processing and may result in an EMP501 being rejected outright.
In practice this is the item most likely to catch a business that has taken on casual or seasonal staff since March. A payroll system will happily hold a blank or placeholder tax number for months without complaint. The reconciliation is where that stops being tolerated, and registering a handful of employees for income tax numbers is not something to discover you need to do on 30 October.
What late costs
SARS applies an administrative penalty for a late EMP501 of 1% of the employer’s annual PAYE liability, rising by a further 1% for each month the return stays outstanding, to a maximum of 10%. For a business with a modest payroll that is an irritation. For one with a real wage bill it is a meaningful number, and it is charged on the annual liability rather than on the six months being reconciled.
The useful thing about this deadline, compared with most tax deadlines, is that almost all the work is already done. The payroll ran. The returns went in. What remains is checking that three sets of numbers agree, confirming every employee has a valid tax number, and pressing submit on a current version of the software.
The unglamorous version of that job, done in the last week of September, is worth considerably more than the same job done in a panic on the final afternoon of October, and for anyone carrying an unused ETI balance it is the difference between being refunded and simply not being refunded.
