Corporate Income Tax Filing by 30 November: What an SME With No Finance Team Can Actually Assemble

Every Singapore company must e-file its corporate income tax return for Year of Assessment 2026 by 30 November 2026, and that obligation holds even if the company made a loss, made no sales at all, or is sitting dormant. The return covers the financial year that ended during 2025. For a company with no finance team, the form is not the hard part: once the numbers exist, Form C-S takes well under an hour to submit. The hard part is assembling the numbers, and that is a six-week job if you begin in mid-October. Begin in mid-November and you are relying on an accountant who already has forty other clients in the same queue.

What is actually due on 30 November 2026?

One return, filed electronically through the myTax Portal, declaring the company's income for its financial year ending in 2025. There is no paper option and no extension counter. The three things that trip SMEs up are these.

First, filing is not optional for a quiet company. A loss-making company files. A company that invoiced nothing files. A dormant company files unless it has specifically applied for and received a waiver, and that waiver is not automatic or permanent.

Second, the return needs a completed set of accounts and a tax computation behind it. The portal will accept figures you typed in from a spreadsheet, but IRAS can ask you to produce the working for at least five years afterwards.

Third, somebody has to be authorised in Corppass with the corporate tax filing role before they can open the form. This is the single most common reason a company that had its numbers ready still filed late.

Which form does a small company file?

Three options, and the tier you fall into decides how much work the filing is.

• Form C-S (Lite) for companies with annual revenue of S$200,000 or below that otherwise qualify for C-S. It is a short declaration, around six essential fields.
• Form C-S for companies with annual revenue up to S$5 million that are incorporated in Singapore, derive only income taxable at the standard 17 per cent rate, and are not claiming carry-back of losses, group relief, investment allowance or foreign tax credits.
• Form C for everyone else. This one requires financial statements and a tax computation to be attached, not merely held on file.

The practical point for an owner: C-S and C-S Lite are self-declarations. You confirm that you qualify, you enter the figures, and you keep the accounts and computation yourself. That is lighter at the point of filing and heavier if you are ever asked to substantiate it. It is not a reason to avoid them, but it is a reason to make sure the working actually exists somewhere other than in your head.

What records does a company with no finance team need?

This is the list to work through in October, in roughly the order it gets painful.

1. Bank statements for the full financial year, every account, including the one that only takes a single standing order. Download them now. Some banks only keep six to twelve months online.
2. Revenue reconciled to invoices. Total money in is not revenue. Strip out loans, director injections, refunds, GST collected if registered, and anything that is not a sale.
3. Expenses with their category. IRAS cares about the split between deductible business expense, non-deductible private or capital spend, and assets claimed over time. Entertainment, motor car running costs for private plates, fines and renovation are the usual corrections.
4. Fixed asset list with purchase dates and amounts, so capital allowances can be claimed on equipment, laptops and fit-out rather than wrongly expensed.
5. Director fees and salaries, separated. These interact with your IR8A and CPF records, so the numbers should agree with payroll.
6. Loans in and out, including director loans either direction, with dates. An unexplained credit becomes taxable income by default.
7. Approved donation receipts, which carry a deduction well above the amount given, and are routinely forgotten.
8. Any foreign income received in Singapore, and any related party transactions, which have their own disclosure once the totals get large.

If your bookkeeping lives in accounting software that IRAS supports for direct submission, most of the above is already a report rather than an exercise. If it lives in a spreadsheet, the October job is to get twelve months of bank lines categorised once, properly, so that next year is a download instead of a reconstruction.

What does ECI have to do with this deadline?

Estimated Chargeable Income is a separate filing, due within three months of your financial year end, long before November. Companies miss it, then assume the November return cleans it up. It does not. A missed ECI can bring an estimated assessment and a tax bill based on IRAS's guess rather than your accounts, and you then have to object to it within the objection window. If your financial year ended recently and no ECI went in, deal with that this month rather than folding it into the November work.

What happens if 30 November slips?

IRAS can issue an estimated Notice of Assessment, and tax on an estimate is payable whether or not you agree with it. Late filing can bring a composition fee, and in persistent cases a summons naming the directors personally. The reputational cost is quieter but real: a company that cannot produce clean filed accounts struggles with bank facilities, government grant applications, larger customers running supplier checks, and any eventual sale of the business.

The money question is worth stating plainly. Partial tax exemption and the start-up exemption already cut the effective rate on the first slice of profit well below 17 per cent, and any rebate announced at Budget is applied automatically. There is no legitimate saving in filing late. There is a real saving in filing accurately, because capital allowances, approved donations and correctly excluded capital items are deductions most rushed filings leave on the table.

What should be in place before 30 November?

A workable six-week plan from mid-October:

Week of 15 October: confirm who holds the Corppass corporate tax filing role, and that the person is still employed and can log in today. Download every bank statement for the financial year.

Weeks of 20 and 27 October: categorise twelve months of transactions and reconcile revenue to invoices issued.

Week of 3 November: build the fixed asset and capital allowance schedule, pull donation receipts, agree payroll figures.

Week of 10 November: accounts and tax computation finalised, by your accountant if you use one. This is the week they are still available.

Week of 17 November: file. Keep the acknowledgement, the accounts and the computation together in one folder for the five-year retention period.

That leaves the last week of November as buffer rather than as the plan. For a ten to twenty person company, the whole exercise is perhaps twelve to sixteen hours of real work. It only becomes a crisis when those hours land in the final four days.

FAQ

Do I still need to file if my company made no money this year?
Yes. A loss or nil result still requires a return, and filing the loss is how you preserve it for use against future profits. Only a dormant company with an approved waiver is excused, and that status should be confirmed rather than assumed.

Can I file the return myself without an accountant?
Legally, yes, and many small companies do, particularly on Form C-S Lite. The question is whether your accounts and tax computation are sound. The filing is a declaration you are personally confirming. If the underlying bookkeeping has never been reviewed, pay for the computation and file it yourself.

How long do I have to keep the records behind the filing?
At least five years from the relevant Year of Assessment, in a form you can actually produce on request. Digital copies are acceptable. A shoebox of thermal receipts that have faded is not, which is why scanning as you go beats scanning in year four.