Income tax vocabulary helps you understand a tax notice, complete an accurate filing and distinguish the amount of income reported from the amount on which tax is calculated. These 20 words explain taxable income, deductions, reliefs, credits, rebates, assessments and refunds, without assuming everyone lives under the same tax system.
If you are searching for the difference between a tax deduction and a tax credit, start with which figure changes. A deduction or qualifying relief generally reduces a defined income base, while a credit usually reduces calculated tax under that jurisdiction’s rules. A tax refund is money returned because the relevant account has an overpayment or repayable amount; not every relief, credit or rebate creates cash to receive.
Quick answer: identify the country, tax year or Year of Assessment, whether filing is required, and the actual deadline. Check pre-filled income rather than assuming it is always complete. Singapore’s IRAS has a Direct Notice of Assessment process for some taxpayers, while other individuals must file or correct information. Do not copy another country’s forms, deductions or deadlines into your own filing.
Quick answer: the top 20 words and meanings
The table translates 20 terms that appear on income tax websites, returns and assessment notices. The longer definitions explain why similar words can produce different results depending on where tax is assessed.
| Word or term | Meaning in plain English |
|---|---|
| Tax year | A period used for reporting and calculating taxes under the applicable jurisdiction. |
| Year of Assessment (YA) | A term used in Singapore and some other systems for the year in which income is assessed to tax. |
| Income tax return | The form or electronic submission used to report relevant income and other tax details. |
| Tax residency | The status used to determine how a person’s income is taxed under relevant law. |
| Gross income | An income figure before specified deductions or adjustments. |
| Assessable income | A figure used in Singapore’s tax computation after specified allowable expenses or donations. |
| Taxable or chargeable income | The income amount on which tax is calculated after the applicable deductions or reliefs. |
| Allowable expense | A qualifying expense that a tax system permits to be considered in reducing income or profits. |
| Tax deduction | An amount subtracted from a defined income or tax calculation base under specific rules. |
| Tax relief | A tax benefit that reduces a specified tax burden under the local system. |
| Tax credit | An amount credited against calculated tax under the relevant law. |
| Tax rebate | A reduction or return of tax under a defined rebate scheme. |
| Withholding | Tax money deducted or retained before an income recipient receives the full amount, where the law requires it. |
| Pre-filled information | Income or other details entered into a tax portal from sources available to the authority. |
| Filing requirement | The rule determining whether an individual must submit a return or provide information. |
| Filing deadline | The latest date by which a required tax return or action must be completed. |
| Notice of Assessment | An official statement of tax assessed, particularly familiar as an IRAS tax bill in Singapore. |
| Amendment | A correction to information previously filed or assessed under the relevant process. |
| Tax refund | Money returned when the tax account contains an amount repayable under the authority’s rules. |
| Tax payable | The tax amount assessed as due after the relevant computation and adjustments. |
What is personal income tax vocabulary?
Personal income tax vocabulary describes the earnings reported to a tax authority, the basis used to calculate liability, filing obligations and the final bill or refund. Different systems use different steps and labels. For instance, Singapore distinguishes assessable income from chargeable income after personal reliefs, while the U.S. uses adjusted gross income and taxable income in its federal filing process. Tax terms also change over time, so use the relevant authority’s current guidance for the exact assessment year.
How to use this vocabulary when it matters
When reading tax instructions, use a six-step sequence to reduce errors and avoid disclosing private financial details unnecessarily:
- Confirm which country’s tax authority and which tax period apply; distinguish the year income was earned from the year it is assessed where necessary.
- Check whether you must file, whether a pre-filled or automatically assessed process applies, and whether the information needs correction.
- Gather reliable income records and identify what categories of income the authority says are reportable.
- Review eligible allowable expenses, donations, tax deductions, reliefs or credits using the specific year’s official qualifying conditions.
- Read the assessment or computation: identify the amount of income used, adjustments, calculated tax, paid amounts and any amount due or repayable.
- File or amend through the official portal by the relevant deadline, keep an acknowledgement and follow the current instructions for payment, objections or refunds.
The tax return and tax bill are not the same document. A return is information submitted when filing is required; an assessment or bill is the authority’s calculation or confirmation of the tax position under its procedure. Singapore IRAS states that its Notice of Assessment shows the income assessed, deductions and tax payable or repayable. In the U.S., IRS terms such as adjusted gross income appear on federal return forms. Do not infer that one country’s terminology or process is universal.
All 20 vocabulary words with examples and differences
1. Tax year
Meaning: A period used for reporting and calculating taxes under the applicable jurisdiction. For many individuals it corresponds to a calendar year, but systems vary.
Natural example: “Which tax year does this income statement cover?”
Do not confuse it with: The tax year is not necessarily the year in which a tax bill arrives.
Practise: Check both the earning period and filing period.
2. Year of Assessment (YA)
Meaning: A term used in Singapore and some other systems for the year in which income is assessed to tax. For Singapore individual employment income, YA 2026 usually concerns income earned in 2025.
Natural example: “My Singapore Notice of Assessment refers to YA 2026.”
Do not confuse it with: YA is not always identical to the calendar year in which the income arose.
Practise: Match the YA to the correct basis period before reviewing income.
3. Income tax return
Meaning: The form or electronic submission used to report relevant income and other tax details. Whether you must file depends on your country’s law and circumstances.
Natural example: “I checked whether an income tax return is required this year.”
Do not confuse it with: An income tax return is not itself the final tax bill.
Practise: Check the filing requirement and keep the submission confirmation.
4. Tax residency
Meaning: The status used to determine how a person’s income is taxed under relevant law. It may depend on presence, domicile, connections or other rules.
Natural example: “I need to confirm my tax residency before applying the rates.”
Do not confuse it with: A passport or immigration status alone does not always determine tax residency.
Practise: Consult the jurisdiction’s official residence tests.
5. Gross income
Meaning: An income figure before specified deductions or adjustments. The exact items included depend on the tax rules and context.
Natural example: “The gross income entry includes my reportable employment earnings.”
Do not confuse it with: Gross income is not necessarily the amount left after taxes or business expenses.
Practise: Identify all relevant income categories and the accounting basis.
6. Assessable income
Meaning: A figure used in Singapore’s tax computation after specified allowable expenses or donations. The IRAS computation provides the actual recognised amount.
Natural example: “My assessable income differs from total gross receipts.”
Do not confuse it with: Assessable income is not automatically the final chargeable income.
Practise: Read the authority’s definition and the allowed adjustments.
7. Taxable or chargeable income
Meaning: The income amount on which tax is calculated after the applicable deductions or reliefs. Singapore commonly uses chargeable income; U.S. federal tax uses taxable income.
Natural example: “The tax rate applies to the chargeable income shown on my bill.”
Do not confuse it with: Taxable income is not the same as tax payable in dollars.
Practise: Separate the income base from the tax calculation.
8. Allowable expense
Meaning: A qualifying expense that a tax system permits to be considered in reducing income or profits. Not every personal purchase counts as allowable.
Natural example: “Can I claim this work-related expense under the current rules?”
Do not confuse it with: An expense existing in real life does not automatically make it deductible.
Practise: Check evidence, business connection and the exact eligibility test.
9. Tax deduction
Meaning: An amount subtracted from a defined income or tax calculation base under specific rules. Some systems distinguish deductions from personal tax reliefs.
Natural example: “The tax deduction reduced the income used for computation.”
Do not confuse it with: A $100 deduction normally does not mean $100 less tax payable.
Practise: Verify the eligible amount and how it affects the calculation.
10. Tax relief
Meaning: A tax benefit that reduces a specified tax burden under the local system. In Singapore personal reliefs generally reduce assessable income when eligibility conditions are met.
Natural example: “I checked whether I qualify for a personal tax relief.”
Do not confuse it with: Relief is not automatically a direct cash refund or an unrestricted discount.
Practise: Check the relevant tax year’s rules and any caps.
11. Tax credit
Meaning: An amount credited against calculated tax under the relevant law. It may be refundable or non-refundable depending on the programme.
Natural example: “I asked whether the tax credit can reduce the amount I owe.”
Do not confuse it with: A credit is different from an income deduction.
Practise: Check whether unused credit can be carried forward or repaid, if applicable.
12. Tax rebate
Meaning: A reduction or return of tax under a defined rebate scheme. The name and method differ by jurisdiction and assessment year.
Natural example: “The rebate shown on the assessment reduced the tax amount.”
Do not confuse it with: A rebate is not necessarily payable in cash when no tax is owed.
Practise: Read the rebate’s eligibility, calculation and year.
13. Withholding
Meaning: Tax money deducted or retained before an income recipient receives the full amount, where the law requires it. U.S. payroll often uses income-tax withholding; Singapore payroll arrangements are different.
Natural example: “The U.S. payslip shows federal income tax withholding.”
Do not confuse it with: Withholding rules should not be assumed identical worldwide.
Practise: Check which authority received the amount and how it is credited.
14. Pre-filled information
Meaning: Income or other details entered into a tax portal from sources available to the authority. A person may still have to verify or correct those details.
Natural example: “I reviewed the pre-filled income before proceeding.”
Do not confuse it with: Pre-filled does not mean every entry is guaranteed correct or complete.
Practise: Compare with accurate employer and other income records.
15. Filing requirement
Meaning: The rule determining whether an individual must submit a return or provide information. It may depend on income, status, notices or other circumstances.
Natural example: “The portal says I am not required to file under this process.”
Do not confuse it with: Not filing when exempt is different from ignoring a filing notice.
Practise: Check your actual notification and official guidance.
16. Filing deadline
Meaning: The latest date by which a required tax return or action must be completed. Deadlines can change with filing type, year, extensions or local rules.
Natural example: “What is the filing deadline for this assessment year?”
Do not confuse it with: A filing deadline is not necessarily the payment due date.
Practise: Check the official portal rather than using an old article’s date.
17. Notice of Assessment
Meaning: An official statement of tax assessed, particularly familiar as an IRAS tax bill in Singapore. It may be original, amended, additional or estimated under the local process.
Natural example: “My Notice of Assessment shows the amount due.”
Do not confuse it with: The assessment is not the same as the earlier return submission.
Practise: Review the income and claims on the notice for accuracy.
18. Amendment
Meaning: A correction to information previously filed or assessed under the relevant process. Deadlines and allowable methods differ by jurisdiction.
Natural example: “I need to submit an amendment because one income item is missing.”
Do not confuse it with: Amending a tax bill is not necessarily the same as making an informal enquiry.
Practise: Use the correct official amendment service and retain evidence.
19. Tax refund
Meaning: Money returned when the tax account contains an amount repayable under the authority’s rules. It can arise from overpayments or specified refundable credits.
Natural example: “The tax authority confirmed the refund was due.”
Do not confuse it with: A refund is not automatically created by every deduction or relief.
Practise: Verify the tax account and never provide banking details to a random message.
20. Tax payable
Meaning: The tax amount assessed as due after the relevant computation and adjustments. It may have a different due date from a return’s filing deadline.
Natural example: “My tax payable appears on the official assessment.”
Do not confuse it with: A chargeable income figure is not itself the tax payable.
Practise: Check the amount, deadline and official payment method.
Worked example: how income becomes a tax calculation, not necessarily a refund
Imagine a fictional Singapore individual with $50,000 of relevant income in a period. Under a purely illustrative assumption, the tax computation accepts $5,000 of allowable expenses and approved donations. The result for this example is $45,000 assessable income. These figures are not a statement that the particular expenses would be legally eligible for any real person.
Suppose this person also meets conditions for $10,000 of personal reliefs. The simplified chargeable income is then $45,000 minus $10,000, or $35,000. This matches the basic conceptual distinction shown in IRAS’s explanation of an individual tax assessment: assessable income is adjusted before the final chargeable income is determined.
What is the actual tax payable? That cannot be calculated from the example without confirming the relevant year’s rates, residency status, eligible tax calculations and any rebates or credits. A $10,000 relief does not mean the taxpayer receives $10,000 in cash.
Now imagine that a tax bill shows the taxpayer already paid more than the final amount due. In that situation a tax refund may be generated under the authority’s rules. It is different from the relief itself. Likewise, a tax rebate may reduce calculated tax but not necessarily create a payment when tax payable is already zero.
The taxpayer checks their Notice of Assessment against reliable employment and other records. If the portal has pre-filled the wrong income or a relief does not match eligibility, they use the appropriate official amendment procedure. Singapore IRAS publishes instructions and specific timelines for correcting an assessment; do not assume a submitted correction automatically suspends a payment obligation.
U.S. distinction: the IRS uses adjusted gross income (AGI) and taxable income in its federal tax return. Tax credits and deductions have different effects, and federal withholding is often shown on employee payslips. These terms help explain U.S. returns but do not mean a Singapore employee’s payslip and IRAS bill will look the same.
Some Singapore taxpayers receive a Direct Notice of Assessment and may not have to file a return unless IRAS requests action or a correction is required. The only safe answer to “Do I need to file?” is to check the taxpayer’s actual notification and the official rules for the relevant YA.
Finally, avoid income-tax scams. A message containing the words “refund approved” or “tax relief” is not proof of a government payment. Use the country’s official portal independently, keep tax documents private and never reveal passwords or verification codes to an unsolicited sender.
Common mistakes and how to fix them
- Confusing income earned in a basis period with the Year of Assessment → label the earning year and assessment year separately.
- Treating a tax deduction as a dollar-for-dollar reduction in tax payable → distinguish the income base from calculated tax.
- Calling every credit or rebate a guaranteed cash refund → check whether a refundable amount actually exists.
- Assuming pre-filled data is always correct → verify income, claims and tax residence status.
- Copying an IRS form or deduction into Singapore filing → use the correct country’s definitions and qualifying conditions.
- Believing all taxpayers have an identical filing requirement → read the official notice or filing rules.
- Ignoring a tax bill while waiting for an amendment → check payment and correction obligations with the authority.
A practical 15-minute vocabulary exercise
Spend fifteen minutes with a fictional notice rather than a real tax account. For five minutes, label the income period, assessment year, income categories, allowable adjustments and chargeable income. Work through $50,000 minus $5,000 minus $10,000 to reach $35,000, while recognising the amounts are not legal entitlements.
For the next five minutes, label which items reduce an income base and which can affect a final tax amount. Explain in one sentence why a refund is not a synonym for a deduction.
Use the last five minutes to list the official questions to verify before filing: Does this country require a return? What is the deadline for this tax period? Are pre-filled records correct? Where do I check the assessment and request amendments? Keep the exercise free of tax identification numbers or actual personal returns.
Frequently asked questions
What are the first income tax words to learn?
Start with tax year, tax residency, income tax return, taxable or chargeable income, deduction, relief, credit, assessment, tax payable and refund. Add your country’s more specific labels.
What is the difference between a tax deduction and tax credit?
A deduction usually reduces the relevant income base for calculating tax. A credit usually reduces tax calculated under an eligible scheme. Precise effects depend on the jurisdiction and year.
What does Singapore’s Year of Assessment mean?
For ordinary Singapore individual employment income, a Year of Assessment generally considers income earned in the preceding calendar year. For example, YA 2026 relates to employment income earned in 2025.
Does a tax relief guarantee a refund?
No. A qualifying relief may reduce income subject to tax, whereas a refund requires an amount repayable under the tax account’s rules. They are not the same thing.
Do I need to file if my tax portal already has information?
Not necessarily. Some systems use pre-filled returns or direct assessments. In Singapore, check the actual IRAS notification and correct inaccurate information according to its instructions.
Reliable sources and further reading
- Singapore IRAS: Understanding My Tax Assessment — assessable income, chargeable income, tax payable and repayable.
- Singapore IRAS: Individuals Required to File Tax — filing duties and Direct Notice of Assessment.
- Singapore IRAS: Tax Reliefs — qualifying conditions and distinction between reliefs and rebates.
- U.S. IRS: Adjusted Gross Income — how U.S. federal AGI is derived.
- Singapore IRAS: Basic Guide for Individual Taxpayers — reading assessments, tax payments and amendment procedures.
Read more on eduKateSG
Read Singapore Vocabulary | IRAS Income Tax Filing, Relief and Notice of Assessment for country-specific language, Salary and Payslip Vocabulary for income records, and Personal Budgeting Vocabulary for managing planned obligations. Explore the Vocabulary collection for more guides.
The purpose of learning each word is to understand the real instruction, document or decision behind it. A precise, honest question is often more helpful than a complicated explanation. Revisit the glossary when the situation comes up.