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Section 139(1) of the Income Tax Act – Who Must File ITR, Due Dates & Rules
A plain-English guide to mandatory Income Tax Return filing for AY 2026-27 — who is covered, the Seventh Proviso triggers, exact due dates, and what happens if you miss them.
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If you have ever wondered whether you are legally required to file an Income Tax Return this year, the answer starts with one section: Section 139(1) of the Income Tax Act, 1961. It is the foundational provision that decides who must file a return, when it is due, and which high-value transactions can force filing even if your income is below the tax-free limit. Getting this wrong is one of the most common — and most expensive — mistakes Indian taxpayers make, leading to late fees, lost refunds, and blocked loss carry-forwards.
Quick Answer
Under Section 139(1), every company and firm must file an ITR every year regardless of profit or loss, and every individual, HUF, AOP or BOI must file if total income before deductions exceeds the basic exemption limit. Even below that limit, the Seventh Proviso to Section 139(1) makes filing compulsory if you deposit over ₹1 crore in current accounts, spend over ₹2 lakh on foreign travel, pay electricity bills above ₹1 lakh, or cross prescribed turnover, TDS/TCS or savings-deposit thresholds. For FY 2025-26 (AY 2026-27), the due date is 31 July 2026 for non-audit ITR-1/ITR-2 filers, 31 August 2026 for non-audit ITR-3/ITR-4 filers, and 31 October 2026 where a tax audit applies.
What This Guide Covers
- What is Section 139(1) of the Income Tax Act?
- Who must file an ITR under Section 139(1)?
- Mandatory filing under the Seventh Proviso
- ITR filing due dates for AY 2026-27
- Belated return (139(4)) & revised return (139(5))
- What happens if you don't file on time
- How to file your ITR, step by step
- Why file with SetupFiling.in
- Related tax & compliance services
- Frequently asked questions
What is Section 139(1) of the Income Tax Act?
Section 139(1) of the Income Tax Act, 1961 is the provision that legally obligates specified persons to furnish a return of income for a financial year, on or before a prescribed due date, in the prescribed form. It sets out two broad categories of filers: companies and firms, who must file irrespective of income or loss, and every other person — individuals, Hindu Undivided Families (HUFs), Associations of Persons (AOPs), Bodies of Individuals (BOIs), and artificial juridical persons — who must file only if their total income, computed before allowing deductions under Chapter VI-A (Sections 80C to 80U) and certain other exemptions, exceeds the basic exemption limit applicable to them.
For FY 2025-26 (AY 2026-27), the basic exemption limits are as follows:
| Taxpayer Category | Tax Regime | Basic Exemption Limit |
|---|---|---|
| Individual / HUF (any age) | New Regime (default) | ₹4,00,000 |
| Individual below 60 years | Old Regime | ₹2,50,000 |
| Senior citizen (60–79 years) | Old Regime | ₹3,00,000 |
| Super senior citizen (80+ years) | Old Regime | ₹5,00,000 |
| Company / LLP / Firm | Not applicable | Must file regardless of income, loss, or activity |
Note that a tax rebate under Section 87A, which can bring your final tax liability to nil, is different from the basic exemption limit that triggers the filing obligation. Many taxpayers wrongly assume that a nil tax liability means they don't need to file — that is not correct if your total income before deductions crosses the applicable threshold.
Who Must File an ITR Under Section 139(1)?
Based on the plain reading of Section 139(1), the following categories of persons are required to file an Income Tax Return:
- Every company, whether private limited, public limited, one person company, or Section 8 company — even if it made a loss or had zero transactions during the year.
- Every firm, including a Limited Liability Partnership (LLP), regardless of profit, loss, or business activity.
- Every individual, HUF, AOP or BOI whose total income before claiming deductions exceeds the basic exemption limit applicable to their age and chosen tax regime.
- Residents holding a foreign asset, foreign bank account, or signing authority in any account located outside India, or having income from a source outside India — filing is compulsory regardless of income level.
- Anyone wanting to carry forward a business loss or capital loss to set off against future income, since this benefit is only available if the return is filed by the original due date.
- Trusts, institutions and NGOs claiming exemption under Sections 10, 11 or 12, if income before claiming the exemption exceeds the basic exemption limit.
- Any person who meets a Seventh Proviso condition, discussed in detail below, even if their income is below the basic exemption limit.
Mandatory Filing Under the Seventh Proviso to Section 139(1)
The Seventh Proviso to Section 139(1), read with Rule 12AB of the Income-tax Rules, converts certain high-value financial transactions into an independent trigger for filing — completely decoupled from your actual taxable income. This means a person can have zero tax liability, thanks to deductions or the Section 87A rebate, and still be legally required to file. You must file an ITR if, during the financial year, you have:
- Deposited ₹1 crore or more (in aggregate) in one or more current accounts with a bank or co-operative bank.
- Incurred expenditure of ₹2 lakh or more on foreign travel, for yourself or on behalf of any other person, including funding a family member's trip.
- Paid electricity bills totalling ₹1 lakh or more during the year.
- Business turnover exceeding ₹60 lakh, or gross professional receipts exceeding ₹10 lakh.
- TDS or TCS deducted or collected of ₹25,000 or more during the year (₹50,000 or more for senior citizens).
- Aggregate savings bank deposits crossing the prescribed threshold under Rule 12AB, even if the deposited amount itself is not taxable income.
Meeting even one of these conditions is enough to make filing compulsory. When you file for this reason alone, remember to select the specific field in the ITR form confirming that you are filing under the Seventh Proviso, to avoid unnecessary department queries later.
ITR Filing Due Dates for AY 2026-27 (FY 2025-26)
Section 139(1) also prescribes the due date by which the return must be filed. For the current filing season, the due dates are staggered by taxpayer category:
| Category of Taxpayer | Due Date for AY 2026-27 |
|---|---|
| Salaried individuals & other non-audit ITR-1 / ITR-2 filers | 31 July 2026 |
| Individuals, professionals & firms filing ITR-3 / ITR-4 (no audit) | 31 August 2026 |
| Businesses, companies & professionals requiring a tax audit | 31 October 2026 |
| Entities with international or specified domestic transactions (Form 3CEB) | 30 November 2026 |
| Belated return under Section 139(4) | 31 December 2026 |
| Revised return under Section 139(5) | 31 March 2027 (or before assessment completion, if earlier) |
These dates are as notified by the CBDT for the current filing season and are subject to change if the department announces a further extension. It is always safer to file well before your applicable deadline rather than wait for a possible extension announcement.
Belated Return (Section 139(4)) & Revised Return (Section 139(5))
Belated Return – Section 139(4)
If you miss the original due date under Section 139(1), you can still file a belated return under Section 139(4), generally up to 31 December of the relevant assessment year. However, a belated return attracts a late fee under Section 234F, interest under Section 234A on unpaid tax, and — importantly — you lose the right to carry forward most business losses and capital losses (loss from house property remains an exception, subject to conditions).
Revised Return – Section 139(5)
If you have already filed a return and later discover an error, omission, or wrong disclosure, you can correct it by filing a revised return under Section 139(5), before the end of the relevant assessment year or completion of assessment, whichever is earlier. Unlike a belated return, a revised return does not attract a late fee by itself, though interest may apply if additional tax becomes payable.
What Happens If You Don't File on Time
- Late fee under Section 234F: Up to ₹5,000 if total income exceeds ₹5 lakh, and ₹1,000 if total income is up to ₹5 lakh.
- Interest under Section 234A: 1% per month or part of a month on any unpaid tax, calculated from the original due date.
- Loss of carry-forward benefit: Business losses and capital losses generally cannot be carried forward to future years if the return is filed late.
- Departmental notices: Continued non-filing can trigger a notice under Section 142(1) or Section 148, and in serious cases, a best-judgment assessment under Section 144.
- Delayed or forfeited refunds: Any TDS or advance tax paid in excess cannot be refunded until the return is filed and processed.
None of this is meant to alarm you — most of these consequences are entirely avoidable by filing accurately and on time, or by seeking professional help before the deadline passes.
How to File Your ITR Under Section 139(1), Step by Step
- Step 1 — Gather your documents: PAN, Aadhaar, Form 16, bank statements, interest certificates, and your Form 26AS/AIS/TIS from the e-filing portal.
- Step 2 — Identify the correct ITR form: Choosing the wrong form (ITR-1 through ITR-7) is the single biggest cause of a defective return notice under Section 139(9).
- Step 3 — Check the Seventh Proviso conditions: Even with income below the exemption limit, verify whether any high-value transaction applies to you.
- Step 4 — Compute total income under both regimes: Compare the old and new tax regimes and pick whichever results in lower tax for the year.
- Step 5 — Pay any balance self-assessment tax: Clear outstanding tax before filing to avoid interest under Sections 234A, 234B and 234C.
- Step 6 — File before your applicable due date: Submit through the Income Tax E-Filing portal or through a qualified professional.
- Step 7 — E-verify within 30 days: Via Aadhaar OTP, net banking, or a signed physical ITR-V — an unverified return is treated as never filed.
Why File Your ITR With SetupFiling.in
setupfiling.in is an online professional business services platform built by Chartered Accountants, Company Secretaries, and Trademark Attorneys with over 15 years of combined expertise. We have helped 50,000+ entrepreneurs, salaried individuals and businesses across India stay compliant, accurately, and on time.
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Frequently Asked Questions
Who is required to file ITR under Section 139(1) of the Income Tax Act?
Every company and firm must file an Income Tax Return every year regardless of profit or loss. Every individual, HUF, AOP or BOI must file a return if total income before claiming deductions exceeds the basic exemption limit applicable to them. In addition, certain persons must file even below the exemption limit if they meet the high-value transaction conditions under the Seventh Proviso to Section 139(1).
What is the Seventh Proviso to Section 139(1)?
The Seventh Proviso, read with Rule 12AB, makes ITR filing compulsory for individuals, HUFs, AOPs and BOIs even when total income is below the basic exemption limit, if they meet conditions such as depositing over ₹1 crore in current accounts, spending over ₹2 lakh on foreign travel, paying electricity bills above ₹1 lakh, crossing prescribed turnover or TDS/TCS thresholds, or holding large aggregate savings deposits. Meeting any single condition triggers the filing obligation regardless of actual tax payable.
What is the ITR filing due date for AY 2026-27?
For FY 2025-26 (AY 2026-27), the due date is 31 July 2026 for salaried individuals and other non-audit ITR-1 and ITR-2 filers, 31 August 2026 for non-audit ITR-3 and ITR-4 filers, 31 October 2026 for taxpayers whose accounts require a tax audit, and 30 November 2026 for entities with international or specified domestic transactions. These dates apply unless the CBDT issues a further extension.
Is it mandatory for a private limited company to file ITR even with zero income?
Yes. Under Section 139(1), every company and every firm, including LLPs, must file an Income Tax Return every year regardless of whether they earned any income, incurred a loss, or remained inactive. There is no minimum income threshold for companies and firms, unlike individuals.
What happens if I don't file my ITR by the due date?
Missing the due date attracts a late fee under Section 234F of up to ₹5,000 (₹1,000 if total income is up to ₹5 lakh), interest under Section 234A on any unpaid tax, and loss of the right to carry forward most business and capital losses to future years. Continued non-filing can also result in a notice from the Income Tax Department and, in serious cases, an assessment based on information available with the department.
Can I file ITR after the due date has passed?
Yes, a belated return can be filed under Section 139(4), generally up to 31 December of the relevant assessment year, though it carries a late fee and does not allow carry-forward of most losses. If you have already filed and need to correct an error, a revised return can be filed under Section 139(5) before the end of the assessment year or completion of assessment, whichever is earlier.
Do senior citizens have a different exemption limit under Section 139(1)?
Under the old tax regime, the basic exemption limit is ₹2.5 lakh for individuals below 60 years, ₹3 lakh for senior citizens aged 60 to 79, and ₹5 lakh for super senior citizens aged 80 and above. Under the default new tax regime, a uniform basic exemption of ₹4 lakh applies for FY 2025-26 regardless of age, though age-based relief continues to apply for certain reporting requirements.
Is filing ITR compulsory if my income is below the taxable limit?
Not automatically, but it can still become compulsory. If your income is below the basic exemption limit and none of the Seventh Proviso conditions apply to you, filing is optional, though often advisable to claim a refund of TDS or build a financial record. If any high-value transaction condition applies, filing becomes mandatory irrespective of your income level.
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