Income Tax Filing in Singapore (2026): Deadline, Steps and What You Need

Key takeaways

• For Year of Assessment (YA) 2026 — which covers income you earned during the 2025 calendar year — individuals could file their Income Tax Return between 1 March and 18 April 2026.
• The individual filing deadline was 18 April 2026. Missing this deadline can result in penalties or an unfavourable estimated assessment.
• Filing is done through the myTax Portal (mytax.iras.gov.sg), accessed using Singpass.
• Many taxpayers are covered under the No-Filing Service (NFS), meaning they don't need to actively file if their income information has already been submitted by their employer and other reporting parties.
• Corporate Income Tax follows a completely separate filing deadline from individual tax — this is a common point of confusion for residents who also run a business or side hustle.

Understanding Year of Assessment: 2026 versus income earned in 2025

One of the most common points of confusion in Singapore's tax system is the relationship between the Year of Assessment (YA) and the year the income was actually earned. Singapore taxes income on a preceding-year basis, meaning:

• YA 2026 relates to income earned during the 2025 calendar year (1 January to 31 December 2025).
• The filing and payment obligations for YA 2026 occur in the following months, starting from March 2026.

So when you see "income tax filing Singapore 2026," it specifically refers to the filing exercise conducted in 2026 for income earned the year before. This distinction matters because your income for YA 2026 purposes is based entirely on your 2025 earnings, deductions, and circumstances — not anything that happened in 2026 itself.

The 2026 filing window: 1 March to 18 April

IRAS confirmed that for YA 2026, individuals could file their Income Tax Return via myTax Portal from 1 March 2026 through to the deadline of 18 April 2026. This roughly seven-week window gives taxpayers time to gather documentation, review pre-filled information, and submit their return without last-minute pressure — provided you don't leave it until the final days.

Filing outside this window, particularly filing late, can result in penalties and potentially an estimated Notice of Assessment issued by IRAS based on their own calculation, which taxpayers would then need to formally dispute if it doesn't reflect their actual income accurately.

Who actually needs to file

Not every taxpayer in Singapore needs to actively submit a tax return each year. IRAS operates a system where a significant number of taxpayers are automatically covered.

The No-Filing Service (NFS)

IRAS confirmed that around 1 million taxpayers received their tax bill directly from mid-March 2026, without needing to file manually. This happens under the No-Filing Service, which applies to eligible individuals whose income information has already been submitted directly to IRAS by their employers (under the Auto-Inclusion Scheme) and other approved organisations, such as banks reporting interest income in some cases.

If you're on NFS, IRAS effectively pre-assesses your tax based on the information already submitted, and you'll simply receive your tax bill without needing to log in and file separately — provided nothing else about your income situation requires disclosure.

When you generally need to file

You are typically required to file your own Income Tax Return if any of the following apply:

• You received a specific notification from IRAS instructing you to file, even if you believe your income falls below the taxable threshold.
• You have income that isn't automatically reported to IRAS, such as freelance or self-employed income, rental income from property, or overseas income remitted into Singapore.
• You are a sole proprietor or otherwise self-employed.
• Your personal circumstances changed in a way that affects your reliefs, deductions, or overall tax position, and this hasn't already been reflected through automatic reporting.

If you're unsure whether you fall under NFS or need to actively file, the safest approach is to log in to the myTax Portal directly — it will clearly indicate your specific filing obligation for that Year of Assessment.

Step-by-step: how to file your income tax return

If you do need to file, here's the practical process:

1. Log in to myTax Portal at mytax.iras.gov.sg using your Singpass credentials.
2. Check your filing status — the portal will show whether you have an active filing obligation or are already covered under the No-Filing Service.
3. Review pre-filled information — for most employees, salary and CPF-related information is auto-included based on your employer's submission under the Auto-Inclusion Scheme (AIS), so you won't need to manually enter these figures.
4. Declare any additional income not already reflected — this includes freelance work, rental income, or income earned overseas that was remitted into Singapore.
5. Claim eligible tax reliefs and deductions — common examples include CPF cash top-up relief, course fee relief, parent relief, and other reliefs you may qualify for based on your circumstances during 2025.
6. Review your full return carefully before submission, checking that all income sources and reliefs are accurately reflected.
7. Submit your return by clicking through the final confirmation step in myTax Portal, ideally well before the 18 April deadline rather than at the very last moment.
8. Retain your Notice of Assessment once it's issued, for your personal financial records and any future reference needs, such as loan applications.

Common mistakes residents make

• Assuming no notification means no obligation. Notification methods and personal filing requirements can vary year to year — always check the myTax Portal directly rather than assuming your situation is unchanged from the previous year.
• Forgetting to declare side income. Freelance work, tuition income, rental income, or overseas remittances remain your responsibility to declare, even if your main employment income is automatically pre-filled.
• Leaving filing to the last day. Server load and last-minute technical issues are more likely to cause problems if you wait until 17 or 18 April to file.
• Confusing personal and corporate tax deadlines. If you also operate a business, note that Corporate Income Tax follows an entirely separate filing timeline from individual income tax — missing this distinction has led some self-employed residents to mistakenly believe they've already met their obligations when they haven't.

Individual versus corporate tax deadlines: don't mix them up

This is a genuinely common area of confusion, particularly for residents who run a side business or company in addition to personal employment:

Tax type	Applies to	Filing deadline (relevant Year of Assessment)
Individual Income Tax	Salaried employees, self-employed individuals, freelancers	18 April (for the applicable filing window, e.g. YA 2026: 1 March – 18 April 2026)
Corporate Income Tax	Registered companies	Separate deadline; for YA 2026 this was 30 November 2026

If you're both a salaried employee and a company director or sole proprietor of a registered business, you may have two separate filing obligations — one for your personal income tax, and a completely separate one for your company's corporate tax — each with its own deadline and portal process.

What happens if you miss the deadline

Missing the individual filing deadline can lead to:

• Late filing penalties, which can increase the longer the delay continues.
• An estimated Notice of Assessment, where IRAS calculates your tax based on their own estimate of your income rather than your actual figures — this estimate is not always favourable and may result in you paying more than necessary until you formally object and correct it.
• Potential further enforcement action for prolonged non-compliance, in more serious or repeated cases.

If you realise you've missed the deadline, the best course of action is to file as soon as possible and, if necessary, contact IRAS directly to explain the delay, rather than continuing to leave it unresolved.

Frequently asked questions

When is the deadline to file income tax in Singapore for 2026? Individuals and partnerships needed to file their Income Tax Return by 18 April 2026, within a filing window that opened on 1 March 2026, covering income earned in 2025.

Do I need to file if I only have one employer and no other income? Possibly not. If you're covered under the No-Filing Service and your employer has submitted your income details under the Auto-Inclusion Scheme, IRAS may issue your tax bill directly without requiring you to actively file. Always confirm your specific status on myTax Portal.

What happens if I miss the filing deadline? You may face late filing penalties, and IRAS may issue an estimated Notice of Assessment based on their own calculation of your income, which you would then need to formally address if it's inaccurate.

Is the corporate tax deadline the same as the individual deadline? No. Corporate Income Tax for YA 2026 had a separate deadline of 30 November 2026, distinct from the individual filing deadline of 18 April 2026. If you run a business, you likely have two separate filing obligations.

How do I check whether I need to file this year? Log in to myTax Portal using your Singpass — it will clearly show whether you have an active filing obligation for the relevant Year of Assessment or are already covered under the No-Filing Service.

Can I amend my tax return after submitting it? If you notice an error after filing, you can generally make amendments through myTax Portal or by contacting IRAS directly, though it's best to review your return carefully before the initial submission to avoid needing corrections later.

Final practical takeaway

Don't assume you're automatically exempt from filing simply because you didn't receive a physical letter in the past — log in to myTax Portal early within the 1 March to 18 April 2026 window to confirm your specific obligation, declare any income that isn't already pre-filled, claim the reliefs you're entitled to, and submit well ahead of the deadline to avoid penalties or an unfavourable estimated assessment.