AIS and IR8A: Why Singapore SMEs Must Register Before 31 December

If your Singapore company paid five or more employees at any point during 2026, you are required to be on the Auto-Inclusion Scheme (AIS), and the registration window closes on 31 December 2026. Register before that date, then submit employment income records for every employee by 1 March 2027. Missing the registration date does not excuse you from filing. It simply makes you late, and it pushes the work onto your employees, who then have to key their own income figures into their tax returns because yours never reached IRAS.

Who actually has to join AIS?

The threshold is five or more employees, and the definition of employee is wider than most owners assume. It covers full-time and part-time resident staff, non-resident staff, company directors, board members and pensioners. The person who works two days a week counts. The director who draws fees and nothing else counts. You are also caught, regardless of headcount, if IRAS has sent you a notice to file employment income records electronically.

This is where peak season creates a compliance problem nobody planned for. An operation that runs four permanent staff all year and brings in three packers for 11.11 and 12.12 has crossed the line. The headcount that matters is the one your payroll actually paid during the year, not the one on your organisation chart in January. If you are close to the threshold, count the payroll register rather than the desks, and if the answer is borderline, register anyway. There is no penalty for being on AIS when you did not strictly have to be.

What does IRAS need by 1 March 2027?

The core document is the IR8A for each employee, showing salary, bonus, director fees, allowances and commissions for the calendar year. Three supporting forms travel with it where relevant:

• Appendix 8A for benefits in kind, such as accommodation, a company car or interest-free loans.
• Appendix 8B for gains from share options or other share-based plans.
• IR8S where excess CPF contributions were made and a refund is being claimed.

Submission happens one of three ways: directly from AIS-compliant payroll software, through the online form in myTax Portal for smaller headcounts, or using the offline validation and submission application that IRAS provides. The route matters less than confirming now that your chosen route works, because the one thing you cannot do in late February is change payroll systems.

Why does Corppass break this more often than payroll does?

The most common February failure is not a wrong number. It is nobody holding the right to file. Whoever submits the records needs the employment income digital service assigned to them in Corppass, and if an external accountant or payroll bureau files on your behalf, that firm needs to be authorised as your third party.

If the person who originally set up your Corppass account has left the company, this becomes a multi-day administrative recovery rather than a five minute permission change. That is a direct argument for doing your leaver access review before year end rather than after. Check the Corppass roles in the same sitting as the AIS registration, while both are cheap.

Why is November the right week for this, and not January?

Look at what sits in the way. The rest of November and all of December belong to 11.11, Black Friday and 12.12, with a change freeze, live monitoring and payout reconciliation taking every hour your finance person has. January brings the new payroll parameters that take effect on 1 January 2027, the year-end close, and the audit pack. February is three working weeks before a hard IRAS deadline.

There is no quiet moment between here and 1 March. The registration itself takes roughly twenty minutes. The data cleanup behind it takes longer, and that is the part that benefits from being discovered in November, when you still have time to fix it, rather than in February, when you can only report it.

What should we clear this week?

1. Count the real headcount. Pull the 2026 payroll register and count every person paid, including temporary peak-season hires, part-timers and directors.
2. Confirm your AIS status. Check whether the company is already registered. Many SMEs registered years ago and forgot. If not, register before 31 December.
3. Fix Corppass now. Confirm a named, currently employed person holds the employment income digital service, and that your accountant is authorised if they file for you.
4. Verify the payroll software. Confirm your system appears on the IRAS supported list for the coming submission year and that the AIS export actually runs. Produce a test file.
5. Find the money that sits outside payroll. Director fees paid by cheque, cash allowances, staff gifts above the exempt threshold, and anything reimbursed informally. These are the figures that do not appear in the payroll export and cause amended filings later.
6. Name an owner and a date. One person, with 1 March 2027 in their calendar and a reminder in mid-January.

What does a clean February look like?

One file leaves your payroll system, validates on the first attempt, and uploads. Nobody retypes a figure. Employees log in to file their taxes, see their employment income already filled in, and ask you nothing. Your finance person spends February on the year-end close instead of chasing benefit-in-kind values from 2026.

That outcome is decided in the first week of November, not in February. The deadline is fixed, the work is small, and the only variable is whether you do it while there is slack in the week or after there is none.

Frequently asked questions

Do we still have to give employees a printed IR8A?

Once you are on AIS and your submission has gone through, you do not need to issue hard copy IR8A forms to employees, because IRAS already holds the figures. Many employers still provide a statement of earnings on request, since staff often need it for loan or visa applications. Treat it as a service to your people rather than a filing obligation.

We only crossed five employees because of 11.11 temporary staff. Are we really caught?

Most likely yes, because the count includes part-time and temporary employees you paid during the year. Confirm your specific situation against the current IRAS guidance or with your tax agent, but the practical answer for a borderline employer is to register. Voluntary registration carries no penalty and removes the risk of being found non-compliant for a threshold you crossed for six weeks of peak trading.

What happens if we miss the 1 March submission date?

Late or missing employment income records are an offence under the Income Tax Act and can attract financial penalties, with further enforcement action possible for continued non-compliance. If you are going to be late, file as soon as you can and contact IRAS rather than waiting to be contacted. The practical cost usually arrives before the penalty does, in the form of employees who cannot complete their own tax filing and come to you for figures you have not yet assembled.