YA 2026 tax filing and GST InvoiceNow: what Singapore companies need done before 30 November 2026

October 3, 2026

Your company's Year of Assessment (YA) 2026 corporate income tax return is due on 30 November 2026. If your company should have received the $2,000 CIT Rebate Cash Grant and didn't, the appeal deadline is the same day. Meanwhile InvoiceNow, already required for new voluntary GST registrations, is being phased in for existing GST-registered businesses from 2028 to 2031. Here's what to check now: which form you file, whether the cash grant applies, and whether your books can cope with both.

If you're preparing Form C-S or Form C, or deciding whether a new Singapore entity should register for GST voluntarily, this guide is for you.

Two November dates and one GST decision

Mark three items, not one.

1. YA 2026 corporate income tax return. It is due 30 November 2026 at mytax.iras.gov.sg for all companies, including companies that made a loss, unless a waiver applies (IRAS Corporate Income Tax Filing Season 2026 page). Late filing or non-filing may result in penalties of up to $5,000.
2. CIT Rebate Cash Grant appeal. Some companies met the local-employee condition only through centralised hiring or secondment and did not receive the grant automatically. IRAS allows an email via myTax Mail by 30 November 2026, with the subject header "Appeal for CIT Rebate Cash Grant", enclosing supporting documents.
3. InvoiceNow for new voluntary GST registrations. This is already in effect from 1 April 2026 for businesses that apply for voluntary GST registration on or after that date (IRAS GST InvoiceNow Requirement page).

If you were GST-registered before 2026, IRAS has been notifying businesses of their mandatory InvoiceNow date since mid-2026. That is a planning input for your finance system now, not a problem to park until 2028 to 2031.

Which return your company actually files

IRAS's filing-season page sets the conditions.

• Form C-S: the company is incorporated in Singapore, annual revenue is $5 million or below, income is taxable at 17%, and the company is not claiming carry-back of current-year capital allowances or losses, group relief, investment allowance, or foreign tax credit and tax deducted at source.
• Form C-S (Lite): the company also qualifies for Form C-S, and revenue is $200,000 or below. The form has six essential fields.
• Form C: all other companies. Filers submit financial statements, tax computations and supporting schedules.
• Dormant companies: if your company carried on no business and had no income in the financial year, it may file the shorter Form for Dormant Company, or need not file at all if IRAS has granted a waiver. Check your status under "Update Corporate Profile" at mytax.iras.gov.sg.

Directors stay responsible when a tax agent files. IRAS is explicit on that point.

Payment is due within one month of the Notice of Assessment, even if you file an objection. Submit any objection or revision within two months from the date of the Notice of Assessment. IRAS asks companies to use its Revise/Object to Assessment digital service.

From 1 July 2027, companies will have to use IRAS's Revise/Object to Assessment digital service for corporate tax objections and revisions. Parliament passed the change in the Finance (Income Taxes) Bill 2026 on 6 October 2026, but it doesn't apply yet.

The YA 2026 rebate is computed by IRAS, not typed into the form

Singapore's corporate income tax rate is a flat 17% of chargeable income for both local and foreign companies (IRAS). Partial tax exemption and the start-up exemption sit under that rate.

• Start-up exemption (YA 2020 onwards, first three YAs, qualifying companies only): 75% of the first $100,000 of normal chargeable income and 50% of the next $100,000, so the maximum exempt amount is $125,000. Not available to investment-holding or property-development companies. The company must be incorporated in Singapore and tax resident and must pass the shareholding test on the IRAS page. A foreign company or a Singapore branch cannot claim it.
• Partial tax exemption (YA 2020 onwards, companies that are not on the start-up scheme): 75% of the first $10,000 and 50% of the next $190,000. The maximum exempt amount is $102,500.

On top of that base sits the YA 2026 corporate income tax rebate and cash grant. The Government enhanced both on 7 April 2026. The table shows the Budget Day figures and the enhanced figures that now apply.

How it works in practice: if your company qualifies for the cash grant and the rebate works out at $2,000 or less, you get the $2,000 grant and no rebate. If the rebate is above $2,000, you get the rebate (capped at $40,000) less the $2,000 grant. If your company doesn't qualify for the cash grant, you get the rebate, capped at $40,000.

Do not deduct the rebate inside Form C, Form C-S, Form C-S (Lite) or the Estimated Chargeable Income. IRAS computes and applies it in the assessment. The cash grant is not taxable.

Who gets the $2,000 cash grant

• From the same IRAS page, a company qualifies if it is an active company that met the local-employee condition in calendar year 2025.

• "Active" means carrying on a trade or business (including holding investments) when the grant is disbursed.

• "Local employee condition" means CPF contributions in 2025 for at least one Singapore citizen or PR employee, excluding shareholders who are also directors.

• Eligible companies were to receive the grant automatically by the second quarter of 2026.

• A local employee may include someone deployed under a centralised hiring or secondment arrangement, if the company can document the arrangement and the recharging of employment costs by a related party for 2025, the person worked solely in the company for that period, the structure is for bona fide commercial reasons, and the person does not count toward the related party's headcount. If you did not receive the grant, use the appeal route by 30 November 2026.

Do not guess whether your group qualifies. Check the 2025 CPF trail against IRAS's wording, then decide whether an appeal is needed.

Books that can survive both ACRA and IRAS

Your tax return and your ACRA financial-statement filing come from the same set of accounts. What ACRA requires depends on your company:

• Solvent exempt private companies need not file financial statements. They may volunteer.
• Dormant relevant companies that meet section 201A of the Companies Act, including the $500,000 substantial-assets test, need not prepare and file.
• "Smaller" and non-publicly accountable companies (revenue for the year not above $500,000 and total assets not above $500,000) file simplified XBRL and a PDF. Full XBRL is about 210 data elements; simplified XBRL about 120.
• Make sure your XBRL preparer is using ACRA Taxonomy 2026.
• Companies using standards other than the prescribed ASC standards need ACRA approval. IFRS accounts that also state compliance with SFRS(I) are not treated as "other standards" on that page.

If the accounting file cannot produce clean financial statements and, where required, XBRL, both the annual return track and the tax track become expensive in November.

GST InvoiceNow without the panic

InvoiceNow is phased. "Total annual supplies" means Box 4 of the GST return for accounting periods ending in calendar year 2025.

Excluded: overseas entities (including overseas vendor registration regimes) and businesses liable to register wholly because of reverse charge.

The 2028 to 2031 dates are an announced timetable. IRAS says the law to apply the requirement to all remaining GST-registered businesses will be passed later, so plan for your date but watch for the legislation.

Support listed by IRAS and IMDA includes free-of-charge solution packages (available up to 31 March 2031, with the current list choosable until 31 March 2027), a GST InvoiceNow Transition Grant ($1,000 if annual supplies are at or under $4,000,000; $5,000 if over), and an InvoiceNow Queen Bee Grant ($25,000 for businesses with total annual turnover over $4,000,000 that have at least 200 suppliers or 200 business customers; integration work from 1 July 2026, completed by 31 March 2030). Eligibility detail is on IMDA's grants page.

In the 26 February 2026 MOF Committee of Supply speech, Senior Minister of State for Finance Jeffrey Siow said over 63,000 businesses were already on InvoiceNow, and that requiring all GST-registered businesses to join by April 2031 "will bring on 90,000 more". He also cited a Deloitte study estimating that digital invoices can save small businesses up to $20 per invoice. That's an estimate, not a guarantee for your business.

What digital filing does not replace

InvoiceNow data is due by the earlier of the GST return filing date or the GST return due date. Existing GST duties remain, including keeping records for at least five years and issuing correct invoices.

Off-the-shelf users must use an IMDA-accredited InvoiceNow-Ready solution and a Peppol ID. In-house systems go through an accredited Access Point. Do not treat any brand as InvoiceNow-Ready unless it appears on IMDA's list in the week you choose the software.

Companies in the first group required to use InvoiceNow (new companies registering for GST voluntarily) have seen faster GST refunds, according to MOF. Treat that as a likely benefit, not a promise.

A pre-filing check before 30 November

Before 30 November, the useful questions are simple. Which form do you file? Does the 2025 CPF trail support the cash grant, or an appeal? Can the accounting file produce XBRL and, if you are GST-registered, InvoiceNow data when your date arrives?

HuOrgCology's accounting team can run that pre-filing check with you. Email solutions@huorgcology.com or call +65 9789 4150.

Legislation, regulators and sources

Legislation and regulators referred to: Income Tax Act 1947; Goods and Services Tax Act 1993; Companies Act 1967; regulators: IRAS, ACRA, IMDA; policy statements: Ministry of Finance, Budget 2026.

• IRAS, Corporate Income Tax Filing Season 2026.

• IRAS, Corporate Income Tax Rate, Rebates and Tax Exemption Schemes (as at October 2026).

• IRAS, Budget 2026 tax changes and enterprise disbursements (Budget Statement 12 February 2026).

• IRAS, GST InvoiceNow Requirement; e-Tax Guide, Adopting GST InvoiceNow Requirement; IRAS newsroom, Committee of Supply 2026.

• ACRA, filing financial statements in XBRL format: requirements and exemptions (updated 24 September 2026).

• MOF, Committee of Supply speech by SMS Jeffrey Siow, 26 February 2026.

This article is general information for Singapore SMEs and foreign companies operating here. It is not tax advice.