Singapore’s income tax Year of Assessment (YA) is not the same as the year you earned the income. YA 2026 concerns income earned in 2025 for most individual taxpayers. The 2026 individual filing season ran from 1 March to 18 April 2026; that deadline has passed. If you are checking this in November 2026, read your actual IRAS Notice of Assessment (NOA) and account status on the official myTax Portal rather than assuming a filing window is still open.
If you search for IRAS income tax filing, tax relief Singapore, NOA meaning, No-Filing Service, tax residency, tax bracket, income tax GIRO or how to amend tax bill, the fastest route to a correct answer is to separate income, income assessed, tax calculated and amount payable. An employer’s automatic submission is not always the same thing as completing your personal filing obligation. A relief reduces qualifying income, while a rebate directly reduces tax payable.
Quick summary: Check the YA and the tax year first; read whether IRAS has told you to file, verify or take no action; review auto-included employment income and any other taxable income; claim only qualifying reliefs; check your NOA; and pay or arrange approved GIRO by the applicable due date. This is a vocabulary and practical-reading guide, not personalised tax advice.
The five most useful tax answers at a glance
| Question | Quick answer | Where it matters |
|---|---|---|
| What is YA 2026? | Income earned in calendar year 2025 is generally assessed in YA 2026 | Distinguishes income year from tax year |
| When was YA 2026 e-Filing due? | 18 April 2026, for taxpayers instructed to file | It is a past deadline on 3 November 2026 |
| Do I need to file if I have AIS employment income? | Follow the actual IRAS filing notification; AIS alone does not always remove that obligation | Pre-filled employment income is not every source of income |
| How do reliefs and rebates differ? | Reliefs reduce chargeable income; rebates reduce calculated tax | Prevents claiming an S$1,000 relief as S$1,000 cashback |
| What if my NOA is wrong? | Use an appropriate IRAS amendment or enquiry route; the ordinary Amend Tax Bill window is 30 days | A challenge does not generally cancel payment obligations |
48 essential Singapore income tax terms
The terms below explain the wording commonly used by IRAS. The final column indicates the decision each term controls. Tax advice must consider the taxpayer’s actual facts, not just an alphabetical list.
| Term | Plain-English meaning | What the term changes |
|---|---|---|
| IRAS | Inland Revenue Authority of Singapore | Administers personal income tax and other taxes in Singapore. |
| Individual Income Tax | Tax on relevant personal income | Income tax is not the same as 9% GST on purchases. |
| YA | Year of Assessment | The year IRAS assesses income from the preceding calendar year. |
| Basis period | Period in which the relevant income was earned | For most individuals, YA 2026 refers to 2025 income. |
| myTax Portal | IRAS online tax portal | Use official Singpass or other supported sign-in. |
| Notice of Assessment (NOA) | The official tax bill | Shows assessed amount and payment information. |
| Amended NOA | A revised tax bill | May follow an accepted amendment or assessment change. |
| Chargeable income | Taxable income after permitted reliefs and deductions | Not the same as gross salary or annual bank deposits. |
| Assessable income | Income measured for tax before certain reliefs | Relevant to tax and some benefit eligibility tests. |
| Gross income | Income before applicable deductions | Different from take-home pay after CPF and other deductions. |
| Tax residency | Status determining applicable income-tax treatment | A foreigner’s residency test is not necessarily citizenship or immigration status. |
| Resident tax rates | Progressive rates for eligible tax residents | The percentage on a top income band is not applied to all earnings. |
| Marginal rate | Rate applying to the next portion of chargeable income | Not the person’s total tax divided by gross salary. |
| Effective tax rate | Total tax divided by the chosen income base | Can be much lower than the top marginal rate. |
| Tax relief | Eligible reduction in income on which tax is calculated | Not a direct dollar-for-dollar reduction of tax payable. |
| Tax rebate | Reduction in tax payable itself | Different from subtracting a relief from chargeable income. |
| Deduction | Qualifying expense or amount reducing relevant taxable income | Must meet IRAS rules and cannot be guessed from receipts alone. |
| Relief cap | Maximum total personal reliefs allowed | S$80,000 overall cap applies to eligible individual reliefs. |
| CPF Relief | Certain CPF contributions qualifying as a tax relief | Not every voluntary transfer automatically qualifies. |
| Earned Income Relief | Relief for eligible people with earned income | Subject to qualifications and age or disability-related rates. |
| Qualifying Child Relief (QCR) | Relief for eligible parents of qualifying children | Eligibility and sharing rules matter. |
| Parent Relief | Support for eligible taxpayers supporting parents | Subject to qualifying conditions and household circumstances. |
| SRS Relief | Tax relief for eligible Supplementary Retirement Scheme contributions | Subject to permitted cap, residency and other rules. |
| Parenthood Tax Rebate (PTR) | Rebate for qualifying parents | Reduces tax payable rather than taxable income. |
| Donations deduction | Permitted deduction for qualifying giving | IRAS recognition and relevant rules determine claim. |
| Rental income | Income from letting property | May need to be declared even if salary is auto-included. |
| Self-employment income | Income from a trade, business or profession | Report appropriate receipts and allowable expenses. |
| Net profit | Business income after deductible business costs | Distinct from total customer payments or turnover. |
| Employment income | Salary, bonus and taxable benefits where applicable | May be prefilled through an employer’s AIS submission. |
| AIS | Auto-Inclusion Scheme | Participating employers transmit eligible employee income data to IRAS. |
| Form IR8A | Statement of employment income from an employer | Useful when employer does not participate in AIS. |
| No-Filing Service (NFS) | IRAS arrangement where eligible people need not file a return | Still check prefilled information and report relevant changes. |
| D-NOA | Direct Notice of Assessment | IRAS can issue a tax bill based on available data without a filing notification. |
| Filing notification | IRAS message requiring a particular action | Your notice controls whether you must file. |
| e-Filing | Electronic filing of a tax return | Submitting a completed form differs from saving a draft. |
| Filing deadline | Last date for required returns | YA 2026 electronic filing deadline was 18 April 2026. |
| Acknowledgement | Proof that an online return was submitted | A saved draft alone is not a completed filing. |
| Re-filing | Replacing a return within the permitted period | Not the same as post-assessment amendment. |
| Amend Tax Bill | IRAS service for correcting certain assessed details | Normally file within 30 days of the tax bill date. |
| Objection | Formal disagreement with an assessment | Usually does not suspend the obligation to pay due tax. |
| GIRO | Authorised recurring bank deductions | Can pay individual income tax by instalments if approved. |
| eGIRO | Online GIRO setup route | Confirm approval and adequate bank balance. |
| Provisional Instalment Plan (PIP) | Estimated schedule before final tax assessment | Adjusted after the current tax bill is finalised. |
| Payment due date | Deadline by which tax must be paid | Usually within one month of an NOA unless a valid GIRO plan applies. |
| Late-payment penalty | Extra charge imposed for overdue tax | IRAS may impose a 5% penalty when tax remains unpaid past due. |
| Tax refund | Money returned when tax overpayment is established | Different from an unverified ‘cash payout’ advertisement. |
| Tax evasion | Unlawful deliberate avoidance of tax | Different from using genuine eligible reliefs. |
| Voluntary disclosure | Correcting errors proactively with IRAS | Relevant when filing mistakes are discovered. |
| Tax calculator | IRAS tool for estimating tax | Illustrative estimate is not an official tax bill. |
| Singpass | Digital identity for government services | Use official sign-in, not links asking for bank passwords. |
Year of Assessment: the date mistake that causes confusion
The tax label YA 2026 may appear on a bill you receive in 2026 even though your salary and other income were earned in 2025. That is because the previous calendar year is normally the basis period for an individual’s income-tax assessment. YA 2027 therefore generally refers to income earned in 2026, but taxpayers should confirm the eventual 2027 filing notices and rules when officially published. The words basis period and Year of Assessment refer to different points on the timeline.
| Calendar period | What it represents | Usual YA |
|---|---|---|
| 1 January – 31 December 2025 | Personal income earned in the preceding year | YA 2026 |
| 1 March – 18 April 2026 | YA 2026 income-tax filing window | YA 2026 |
| 1 January – 31 December 2026 | Income earned in current calendar year | YA 2027 |
| Next filing season | Check IRAS when the official notice and schedule are issued | Not a filing window to guess from last year’s date |
Do you need to file? Read the actual IRAS message
IRAS has different routes for different taxpayers. If your myTax Portal says you are required to file, submit the relevant return within the filing period even if your employer has already supplied income under AIS. If you are selected for No-Filing Service (NFS), you may not need to file a return, but you should review the pre-filled information and make required adjustments. Some people receive a Direct Notice of Assessment (D-NOA), under which IRAS calculates a bill using existing information and previous approved reliefs.
| IRAS status | What it usually means | What the reader should check |
|---|---|---|
| Required to file | You have a filing obligation for that YA | Return type, details, deadline and receipt |
| No-Filing Service | IRAS may prepare tax assessment with prefilled details | Missing income or inaccurate reliefs still need attention |
| Direct NOA | IRAS assesses without an ordinary filing notification | Review the issued bill and omissions |
| AIS employment income | Employer transmitted qualifying employment income | Check prefilled details and other sources of income |
| No notification | May depend on income and other circumstances | Use IRAS’s filing checker or account, not guess from silence |
Why an employer’s AIS submission is not necessarily your filing
The Auto-Inclusion Scheme lets participating employers send employment income details directly to IRAS. This can save employees from retyping the same income, and that information may be reflected in their return or assessment. However, an individual can still have other income or qualifying relief changes to report. IRAS explicitly says that AIS does not remove the need to file when a taxpayer has received a notification requiring a return. If your AIS income is missing or incorrect, check IRAS’s specific instructions and contact the employer for necessary corrections.
Gross income, assessable income and chargeable income
A person may see an annual salary total on their employer’s statement and assume the entire amount is taxed at a single tax rate. Resident individual income tax is progressive: different portions of chargeable income fall into different bands. Chargeable income can be reduced by permitted reliefs and deductions. That is why gross pay, assessable income, chargeable income and final tax payable should not be treated as synonyms.
For tax residents, IRAS’s published rates from YA 2024 onward begin at 0% for the first S$20,000 of chargeable income, then 2% for the next S$10,000 and 3.5% for the next S$10,000. Higher bands apply progressively, reaching 24% for income above S$1 million. This is not saying that every person’s first S$20,000 of gross wages is untaxed: the figure is chargeable income after relevant calculations and the person’s residency status matters.
Worked example: calculating the marginal tax band
For a fictional Singapore tax resident with S$40,000 chargeable income and no further tax rebates, the published progressive rates give S$0 on the first S$20,000, S$200 on the next S$10,000, and S$350 on the next S$10,000. Total calculated tax is therefore S$550 before any further applicable rebate. The person’s top marginal rate is 3.5%, but S$550 divided by S$40,000 is only 1.375%. A top rate is not the percentage imposed on all income.
Resident is a tax term, not simply an immigration label
A Singapore Citizen or Permanent Resident ordinarily residing in Singapore may be treated as a tax resident, subject to exceptions. Foreigners can qualify based on stay or employment conditions, including a 183-day rule and specified cross-year arrangements. Non-resident tax treatment may differ substantially. For a cross-border worker, the more useful question is “What is my IRAS tax-residency status for this specific YA?” rather than assuming that a visa type fixes all tax questions.
Tax relief, tax deduction and tax rebate are different
| Term | What it reduces | Fictional illustration |
|---|---|---|
| Tax relief | Income subject to tax | S$1,000 allowed relief reduces chargeable income by S$1,000, not necessarily the final bill by S$1,000 |
| Deduction | Relevant taxable income when an expense qualifies | A permitted income-producing expense may reduce the corresponding assessable income |
| Tax rebate | Tax payable after it has been computed | An allowed S$100 rebate can reduce an eligible S$550 bill to S$450 |
| Tax refund | Overpayment already made | Money may be returned after assessment, not because a relief exists |
Singapore’s overall personal relief cap is currently S$80,000 per YA. That does not mean every individual may claim S$80,000: each relief must independently satisfy its conditions, and the cap limits the total qualifying reliefs. IRAS also says Course Fees Relief lapsed from YA 2026; do not copy a relief list from an old blog or assume a SkillsFuture course automatically earns an income-tax deduction.
A qualifying receipt does not automatically mean a deduction
IRAS distinguishes personal expenses from costs incurred to produce taxable income. Commuting from home to the workplace, ordinary personal meals and many everyday costs are not automatically deductible employment expenses even if they feel work-related. A self-employed person may have allowable business expenses, but the rules relate to the nature of the trade and whether the expenses meet the tests. Learn the word allowable before collecting a pile of receipts and calling everything ‘tax deductible’.
Rental income, freelance work and other earnings
People whose employment income is already prefilled can still have rental income or self-employment profits that need attention. The relevant IRAS assessment distinguishes gross rent from allowable expenses; business turnover from net profit; and taxable from non-taxable receipts. For a freelance worker, money passing through a bank account is not, by itself, a complete tax computation. The reader should identify actual business receipts, qualifying costs and personal spending separately.
- Employees: read AIS prefilled income, bonus and other relevant taxable benefits.
- Landlords: check how IRAS treats gross rent, rental expenses and any applicable simplified expense method.
- Self-employed people: maintain records of fees and permitted costs; learn what ‘net trade income’ means.
- People with different sources: do not assume that one prefilled salary covers every income category.
- Non-residents: verify tax residency and the correct rules for their specific work or income.
Notice of Assessment: read the bill line by line
Your NOA is an assessment, not a request to start the previous year’s tax return. It may include the assessed YA, chargeable income, tax calculation, reliefs and rebates, tax payable and payment information. IRAS usually communicates tax notices digitally, so use the official portal to read the genuine bill. The most useful first step is checking the assessment year, income sources and relief claims against your records.
| NOA field | Question to ask | Common confusion |
|---|---|---|
| YA and tax residency | Which tax year and status does this assessment use? | Comparing it to current-year salary rather than prior-year income |
| Assessable income | Were all taxable income sources captured? | Assuming AIS includes rent or every freelance payment |
| Reliefs and deductions | Do I qualify, and did I claim correctly? | Treating historical eligibility as permanent |
| Tax payable | What is the assessed amount after applicable calculations? | Multiplying all salary by the highest marginal rate |
| Payment due | How and when must I pay? | Assuming an amendment request automatically pauses collection |
What if the tax bill is wrong in November 2026?
IRAS provides the Amend Tax Bill digital service to correct eligible income, relief, deduction and related assessment details. Its ordinary service deadline is within 30 days from the date on the tax bill. Because the YA 2026 filing window has already ended, do not try to resolve a received 2026 bill by following a guide about submitting an April filing draft. Read the amendment service instructions, and if you are outside the ordinary window, contact IRAS about the appropriate process for late corrections or relevant preceding years.
Importantly, IRAS says that an objection or amendment does not automatically remove the obligation to pay the assessed tax. Generally, tax must be paid or covered by an approved arrangement within one month of the bill even if you dispute the calculation. If the bill is later revised in your favour, IRAS has a refund or account-adjustment process. The words amend, object, pay and refund are separate actions.
GIRO instalments, payment reminders and penalties
Taxpayers can use GIRO for an approved monthly payment arrangement, typically up to 12 interest-free instalments. IRAS explains that the normal yearly provisional instalment cycle runs from May to April and is later adjusted once the assessed bill is finalised. An instalment plan is not a cancellation of the underlying tax; scheduled deductions must succeed. Keeping enough money in the linked account is part of completing the arrangement.
If the relevant tax remains unpaid after the due date and no effective arrangement covers it, IRAS may impose a 5% late-payment penalty, followed by further enforcement measures under the applicable rules. If you cannot pay, the safer action is to use IRAS’s official Apply/Manage GIRO Plan service or contact the authority, rather than respond to an unknown collection message asking for a personal bank transfer.
Tax scams: a fake refund can look convincing
A message offering an unusually large ‘IRAS refund’ may demand your login, bank password, an OTP or an account transfer. Verify the notice in myTax Portal by opening the IRAS website independently. IRAS’s tax notices are not proof that every message on social media is a government instruction. Even when a tax refund is genuinely due, it follows official assessment and payment channels, not a stranger’s arbitrary link.
| Misleading sentence | Correct interpretation |
|---|---|
| My employer filed my income, so I never have a filing duty. | AIS auto-inclusion is not the same as all filing and reporting obligations. |
| YA 2026 is my salary from 2026. | For most individuals it refers to 2025 income. |
| A S$1,000 relief saves S$1,000 tax. | Relief reduces income subject to rates; the tax saving depends on the rates. |
| If I object, I do not need to pay by the due date. | IRAS generally still requires payment during the objection process. |
| The highest bracket rate applies to every dollar. | Progressive tax rates apply across marginal bands. |
| Every course has a tax-deductible fee. | Course Fees Relief lapsed from YA 2026, and rules differ by claimed expense. |
| NFS means I never need to check my tax. | Check for missing income or relief changes and read the resulting assessment. |
Frequently searched IRAS questions
What does YA 2026 mean for Singapore personal income tax?
It generally means the income year 2025 being assessed during 2026. Confirm the basis period for unusual cases.
When is the Singapore income tax deadline?
For YA 2026 individual e-Filing the deadline was 18 April 2026. On 3 November 2026 that filing period is closed; check IRAS’s future announcements rather than assuming the 2027 date has been formally set.
Do I file if my employer is under AIS?
Follow the filing notification on myTax Portal. Your employer’s AIS submission pre-fills relevant income but may not remove your personal filing duty or other income reporting.
What is NFS?
The No-Filing Service allows selected taxpayers not to submit an ordinary return, provided relevant prefilled information and reliefs are correct and any required adjustments are made.
What is a Notice of Assessment?
The NOA is your official tax bill, showing how IRAS assessed your income tax and how payment or a correction should be handled.
What is the difference between tax relief and rebate?
A relief reduces chargeable income; a rebate reduces calculated tax payable. Neither is automatically a bank refund.
Can I amend an incorrect tax bill?
IRAS’s Amend Tax Bill digital service normally allows relevant corrections within 30 days of the date on the bill, with separate processes for certain older cases.
Can I pay my tax by GIRO instalments?
IRAS offers approved GIRO instalment arrangements, usually up to 12 interest-free monthly deductions; the plan and due dates must be followed.
Will disputing the NOA stop the payment deadline?
Generally not. IRAS says you must pay according to the assessment and approved arrangement while the matter is being reviewed.
Are all work expenses tax deductible?
No. IRAS has specific conditions; normal commuting and many personal costs are not deductible employment expenses.
Four short exercises to understand your tax bill
| Exercise | Task | Evidence of understanding |
|---|---|---|
| 1 — Timeline | Explain YA, basis period and filing date using 2025–2026 | You do not mistake income year for assessment year |
| 2 — Rates | Calculate progressive tax on fictional S$40,000 chargeable income | You know marginal versus effective rates |
| 3 — Notice | Read a fictional NOA and separate income, reliefs, rebate and payable tax | You can identify the actual balance due |
| 4 — Correct | Choose between filing, amending and paying for different dates | You know which official IRAS action is relevant |
Related eduKateSG guides
- How Singapore Works | IRAS Income Tax and Notice of Assessment — the procedural companion.
- How Does Singapore’s Tax System Work? — income tax, GST and property tax.
- Singapore Vocabulary | CPF and Retirement — contributions and potential reliefs.
- Singapore Vocabulary | Singpass and Myinfo — accessing tax services securely.
- Master Vocabulary — accurate meaning and usage.
- Vocabulary Articles & Knowledge Hub — practical terminology guides.
Official IRAS sources
- IRAS: Tax Season 2026 — historical YA 2026 instructions and deadlines.
- IRAS: Individuals required to file tax — NFS, AIS and notifications.
- IRAS: individual tax rates — residency and progressive rate schedule.
- IRAS: personal tax reliefs — eligibility, lapsed reliefs and S$80,000 cap.
- IRAS: changing a tax bill — amendment deadline and payment obligations.
- IRAS: GIRO payment options — instalments and account arrangements.
- myTax Portal — personal filing and assessment records.
Last verified: 3 November 2026. This page is an explanation of tax language and official workflows, not individual tax advice. Relief conditions, filing notices, future-year deadlines and rates may change. Use your live myTax Portal records and IRAS’s published instructions for any actual filing or payment.