Income Tax Return Filing for Business Owners

Quick answer

A proprietor with business income files ITR-3, or ITR-4 if declaring presumptive income and eligible. For AY 2026-27 the return is due 31 August 2026 where no audit applies and 31 October 2026 where one does, with the audit report 30 September 2026. Two obligations sit behind it: books, which start far below any audit threshold, and — once turnover passes ₹1 crore — deducting tax on your own vendors.

Two live years, and which Act governs each

Settle this first: you are working on two years at once, governed by different statutes.

The Income-tax Act, 2025 came into force on 1 April 2026 under section 1(3) of that Act. It does not govern assessment year 2026-27. The Finance Act, 2026 makes the split plain by carrying two charging sections: section 2(1) charges the assessment year commencing 1 April 2026 under the 1961 Act at Part I-A rates, section 3(1) charges the tax year commencing 1 April 2026 under the 2025 Act at Part I-B rates. And section 536(2)(c) keeps the repealed Act applying to proceedings about any tax year beginning before 1 April 2026, including proceedings begun after that date — so a notice about FY 2025-26 landing in 2027 is still a 1961 Act matter. Our guide to the Income-tax Act, 2025 for businesses covers the transition.

Your compliance year, on one page

The twelve months from 1 April 2026. Note how the two years interleave.

Most of what goes wrong goes wrong in the rows above the return.

Which ITR form applies

The form follows the structure. A proprietor with business or professional income generally files ITR-3, or ITR-4 if using a presumptive scheme. Partnership firms and LLPs file ITR-5, and companies file ITR-6. Filing the wrong form is a common reason returns are treated as defective.

The ITR-4 bars that catch owner-operators

ITR-4 eligibility is about the person, not the scheme. ITR-1 and ITR-4 are both barred where you are a director in a company; held unlisted equity shares at any time in the year, including in your own private company; have short-term capital gains, or section 112A long-term gains above ₹1,25,000; hold any asset or signing authority outside India, or have any foreign-source income; have deferred ESOP tax; have any brought-forward or carry-forward loss; or have total income above ₹50 lakh.

Incorporate a subsidiary, take a directorship, or carry a loss forward, and ITR-4 is gone. Since the Department calls ITR-4 optional rather than mandatory, losing it is a form question rather than a scheme question — but confirm with the return utility which form accepts your presumptive declaration. Our ITR filing guide covers form selection; freelancers have their own.

Presumptive versus regular

Small businesses can opt for presumptive taxation, declaring income at a prescribed percentage of turnover — professionals on the professional equivalent — without maintaining detailed books. It is simpler, and it removes an entire machinery from the year. What it does not do is reduce the tax on a profitable business. For AY 2026-27 the provisions are sections 44AD and 44ADA of the 1961 Act; under section 58 of the Income-tax Act, 2025, for tax year 2026-27:

Two things there are routinely misread. The business rate is not a flat 8%, and not a flat 6% — it is a blend computed from your actual receipt mix. And the deemed figure is a floor, not a cap: where the actual profit is higher, the actual profit is the income. So presumptive costs money only when your real margin sits below the deemed rate, and then it costs it every year. That is the honest version of "it suits healthy margins". Regular taxation means full books and the actual profit — better whenever margins are genuinely thin, at the price of books and possibly an audit.

The two 5% tests are not the same test. The presumptive ceiling in section 58 has one limb: cash receipts of 5% or less of turnover. The ₹10 crore audit relief in section 63 has two: cash receipts 5% or less of receipts and cash payments 5% or less of payments. A business that banks everything it receives but pays wages or freight in cash passes the first, fails the second, and stays on the ₹1 crore audit threshold.

Worked example 1 — the 6/8 split, and the flat-rate error

Assumptions: resident individual, proprietary retail trading business, tax year 2026-27 (income of FY 2026-27, Income-tax Act, 2025), declaring under section 58 Table serial number 1. No other business, no capital gains. Figures are turnover, not profit. Surcharge is not computed.

Turnover is ₹90,00,000 — ₹85,50,000 through bank transfer, UPI and card, ₹4,50,000 in cash.

• Ceiling test. Cash receipts are exactly 5% of turnover. The test reads "5% or less", so the ₹3 crore ceiling applies rather than ₹2 crore.
• Deemed income. 6% of ₹85,50,000 = ₹5,13,000; 8% of ₹4,50,000 = ₹36,000. Total ₹5,49,000. Applying a flat 8% to the whole ₹90,00,000 would give ₹7,20,000 — ₹1,71,000 of income that is not there.
• The floor. Real profit of ₹4,10,000 still gives income of ₹5,49,000. Real profit of ₹6,80,000 gives ₹6,80,000.
• Declaring the real figure. Declare ₹4,10,000 and section 63's separate presumptive limb can put you into a tax audit on that ground alone — at ₹90 lakh of turnover, below the ₹1 crore test.
• Advance tax. A presumptive declaration means a single instalment by 15 March, not four.

Books and tax audit

If you do not use a presumptive scheme, you maintain books of account — and that obligation starts far lower than the audit one, so the ordinary position for a small business is books without an audit, not neither. Section 62 requires books where, in any one of the three preceding years:

A tax audit is a separate, much higher test. Under section 63: business turnover above ₹1 crore, raised to ₹10 crore only where both cash limbs are satisfied; professional gross receipts above ₹50 lakh; and, listed separately, presumptive income declared below the deemed figure. The report is filed before the return — the "specified date" in section 63(5)(a) is one month before the return due date under section 263(1) — so plan the timetable backwards from the return date.

The thresholds are the same on both sides — the Department states they are unchanged from the old Act. What a late report costs is not: for tax year 2026-27, section 428(c) as substituted by the Finance Act, 2026 sets a fee of ₹75,000 where the delay is up to one month and ₹1,50,000 thereafter. For AY 2026-27 the provision is section 271B of the 1961 Act, which is turnover-linked; we did not capture that text and state no figure. Our tax audit applicability page works through the tests in full.

The due dates

Non-audit business and professional cases now file by 31 August, not 31 July. The change is easy to miss because the old date is still correct for a great many people — just not for you.

The table below was substituted into the 1961 Act by Finance Act, 2026 section 5(a), with effect from 1 March 2026; the identical table went into section 263(1) of the 2025 Act by section 66(a), so the same four dates recur in 2027.

The 31 July row is residual. It catches anyone not in one of the three rows above — typically a salaried filer with no business income. Only business or professional income moves the date to 31 August, and only an audit requirement moves it to 31 October. Note too that a partner of an audited firm files by 31 October even though the partner's own accounts are not audited. Any of these dates can be extended by notification, so confirm before relying on one.

Verification is part of the deadline

A return must be e-verified, or the signed ITR-V submitted, within 30 days of filing. Verify later and the date of verification becomes the date of furnishing — so a return filed 31 August and verified 5 October is a late return, with the fee and the loss of carry-forward that follow. Never verified, it is invalid.

If you miss the date

31 December is the belated boundary, not the revised one. For AY 2026-27, revision runs to 31 March 2027 — and because those dates no longer coincide, a belated return can now be revised, which was impossible when both fell on the same day. An updated return cannot produce an enhanced loss, decrease your total tax liability or increase a refund, and only one may be furnished per tax year. Our revised, belated and updated return guide sets out the choice.

Deductions worth claiming

Beyond business expenses, do not leave personal deductions on the table — Chapter VI-A items such as 80C and 80D, where you opt for the old regime. Compare the regimes against your own numbers, because the better choice changes with your deduction profile. The new regime is the default; the old is available by exercising the option under section 115BAC(6). For AY 2026-27 the new-regime rates under section 115BAC(1A)(iii) are:

Health and Education Cess is 4%, with no marginal relief. The section 87A rebate for AY 2026-27 is up to ₹60,000 where total income does not exceed ₹12,00,000, with marginal relief above that, and it is not available against special-rate income such as capital gains. The standard deduction of ₹75,000 under the new regime, ₹50,000 under the old, is a salary deduction: a proprietor's business income does not attract it, though an owner drawing a salary from their own company does.

Two gaps, stated rather than skipped. We give no ceilings for 80C, 80D or any other Chapter VI-A section — a wrong ceiling is worse than none. And business expenses are deducted at a different stage, in computing business income; whether the new regime restricts any particular one is not something we verified.

Worked example 2 — a proprietor's tax and the rebate cliff

Assumptions: resident individual proprietor, AY 2026-27 (income of FY 2025-26, Income-tax Act, 1961). Business income ₹18,00,000 after all business expenses. No salary, no house property, no capital gains. Default new regime under section 115BAC(1A). Surcharge is not computed; confirm whether any applies.

• ₹4,00,001 to ₹8,00,000 at 5% — ₹20,000
• ₹8,00,001 to ₹12,00,000 at 10% — ₹40,000
• ₹12,00,001 to ₹16,00,000 at 15% — ₹60,000
• ₹16,00,001 to ₹18,00,000 at 20% — ₹40,000
• Tax ₹1,60,000 plus 4% cess ₹6,400 = ₹1,66,400. Total income exceeds ₹12,00,000, so no section 87A rebate.

Run the same business at ₹11,60,000. Tax is 5% of ₹4,00,000 plus 10% of ₹3,60,000 — ₹56,000. The rebate is up to ₹60,000 where total income does not exceed ₹12,00,000, so it covers the whole charge and the tax is nil, cess included. That changes how you read Example 1: the ₹1,39,000 the presumptive floor added there costs nothing in a year landing inside the rebate. Do the arithmetic for the year you are in — these are AY 2026-27 figures, and the tax year 2026-27 rates come from a different Schedule to the Finance Act, 2026 that we did not verify.

The advance tax that funded it. Section 405 works as A = B − C: tax for the year, less tax deductible at source. On ₹1,66,400 of tax with ₹26,400 deducted by customers, ₹1,40,000 came from advance tax — ₹21,000 by 15 June, ₹63,000 cumulatively by 15 September, ₹1,05,000 by 15 December, the balance by 15 March.

Your business is also a deductor

Everything above is the tax you pay. This is the tax you must take off other people's money — the part owner-operators usually discover through a disallowance.

Section 402(37) defines a specified person as any person other than an individual or HUF, or an individual or HUF whose sales, gross receipts or turnover exceeded ₹1 crore for a business or ₹50 lakh for a profession in the immediately preceding tax year. A company or an LLP is one from day one; a proprietorship becomes one a year after crossing the threshold, and nothing announces it. The same turnover figure that decides whether you need a tax audit decides, a year later, whether you run a TDS operation.

Where things sit — do not call it all "393"

Within section 393 there are separate tables: sub-section (1) for payments to a resident, (2) for a non-resident, (3) for any person, and (4) for the cases where no deduction is to be made. Salary sits outside section 393 entirely, and so does TCS. A full citation reads section 393(1), Table serial number 2(ii). Our TDS section crosswalk carries every row with its old label, and the TDS calculator is labelled the same way.

Worked example 3 — the year your rent payment changes shape

Assumptions: resident individual, proprietary manufacturing business. Turnover ₹1,42,00,000 in FY 2025-26, the immediately preceding tax year. Tax year 2026-27, Income-tax Act, 2025. The landlord is resident, has furnished a valid PAN and holds no lower-deduction certificate under section 395. Office rent ₹85,000 a month, ₹10,20,000 for the year.

• Turnover exceeded ₹1 crore last year, so from 1 April 2026 the proprietor is a specified person.
• Building rent paid by a specified person falls under section 393(1), Table serial number 2(ii)(b) — 10%, where rent is more than ₹50,000 for a month or part of a month. So ₹8,500 a month, ₹1,02,000 for the year.
• The year before, not being a specified person, the same rent to the same landlord fell under serial number 2(i) at 2%, deducted once, for the last month of the tax year or the tenancy — ₹20,400 — with no TAN required and a challan-cum-statement instead of quarterly returns.
• Same landlord, same rent, five times the deduction and a different filing obligation. Nothing in the tenancy changed; last year's turnover did.
• The section 397(1)(c)(i) TAN exemption covers only serial numbers 2(i), 3(i) and 6(ii), which use Form No. 141 under the Income Tax Rules, 2026 — so now: a TAN under section 397(1)(a), deposit by the 7th of the following month (a March deduction by 30 April), and quarterly statements by 31 July, 31 October, 31 January and 31 May.

Rates for the other common rows — contractor payments, professional and technical fees, commission, interest — are in the crosswalk. If you have employees, salary TDS runs on its own track under section 392, with the salary certificate due 15 June following the financial year — Form 16 for FY 2025-26, and a renumbered form under the Income Tax Rules, 2026 after that. Our payroll compliance guide covers that side.

Worked example 4 — the 30% that turns a missed deduction into a tax bill

Assumptions: the same proprietor and the same ₹10,20,000 of rent, claimed in full as a business expense for tax year 2026-27. No tax deducted on it, and none deposited by the return due date.

• Section 35(b) disallows 30% of the sum in computing business income: ₹3,06,000 added back. For AY 2026-27 the equivalent is section 40(a)(ia) of the 1961 Act, at the same 30%. For a payment to a non-resident, section 35(b)(ii) disallows 100%.
• Interest under section 398(3)(a): 1% a month or part month from the date the tax was deductible to the date it is deducted, then 1.5% a month from deduction to actual payment.
• Fee under section 427: ₹200 a day until the statement is delivered, capped at the tax deductible, payable before it is filed. Penalty under section 448 equal to the tax not deducted, and ₹10,000 to ₹1,00,000 under section 461(1) for a statement not filed or filed with incorrect information — the last waived by section 461(2) where tax, fee and interest were paid and the statement delivered within one month of the prescribed time. The ₹200-a-day fee is not waived by that safe harbour.
• If the landlord has already paid the tax, section 398(2) means you are not deemed an assessee in default, on a certificate in Form 26A — but interest still runs, and nothing we verified says that relief reaches the section 35(b) disallowance.
• Whether the disallowed 30% comes back in a later year when the tax is paid is a question for section 35(b) itself. We did not verify that limb.

The disallowance is usually the expensive item, and the one an auditor finds. Quarterly TDS returns and TAN registration are where we pick this up.

Advance tax, in summary

The full treatment is in our advance tax guide; here is what an owner-operator carries.

• The threshold is ₹10,000 of tax, not ₹10,000 of income — section 208 of the 1961 Act, section 404 of the 2025 Act. TDS comes off first: section 405, A = B − C, where C is tax deductible or collectible at source.
• Four instalments, cumulative — 15% by 15 June, 45% by 15 September, 75% by 15 December, 100% by 15 March (section 408(1)). A presumptive declaration means one instalment, by 15 March (section 408(2)).
• Interest. Section 424, section 234B for AY 2026-27, runs at 1% a month from 1 April where nothing was paid or less than 90% of the assessed tax was. Section 425, section 234C, charges 3% on the first three instalment shortfalls and 1% on the last, with a safe harbour in section 425(2) at 12% by 15 June or 36% by 15 September.
• The first-year relief almost nobody claims. Section 425(4) excludes any shortfall caused by underestimating profits and gains of business or profession accruing or arising for the first time, provided the full tax on that income is paid in a remaining instalment or by 31 March of the tax year. Section 234C carries the equivalent for AY 2026-27.
• An instalment belongs to the year of the income, not the date of payment. The 15 March 2026 instalment is a 1961 Act payment for AY 2026-27; the 15 June 2026 instalment is a 2025 Act payment for tax year 2026-27.

Cash rules that sit alongside the return

Three provisions constrain how a business moves cash. They are enforced by penalty rather than through the return, which is why they surface at the audit.

• Section 186, the old section 269ST, carries the ₹2,00,000 cash-transaction limit. How it is framed — per person, per day, per event — is in the section itself and we do not restate it.
• Section 187, the old section 269SU, requires an electronic payment facility where turnover exceeds ₹50 crore.
• Sections 185 and 188, the old sections 269SS and 269T, govern cash loans and deposits. We did not capture the monetary limit for those two and state none here. Confirm it before taking or repaying a loan in cash.

Common mistakes

• Filing on 31 July out of habit. Non-audit business cases now file by 31 August; audit cases by 31 October.
• Assuming presumptive means less tax. The deemed figure is a floor; a profitable business pays on actual profit either way.
• Claiming the ₹10 crore audit relief on one limb. Receipts and payments both have to pass the 5% test.
• Missing the specified-person switch. Crossing ₹1 crore this year makes you a deductor next year.
• Filing on time and verifying late. Beyond 30 days, the verification date becomes the filing date.
• Diarising 31 December as the revision deadline. That is the belated deadline; revision runs to 31 March 2027.

What this page does not claim

• No notification number for the AY 2026-27 ITR forms. The Department's own FAQ still says they "will soon be notified" while the utilities are plainly live, so we state none.
• No rates for tax year 2026-27. The slabs, cess and rebate above are AY 2026-27 figures; the FY 2026-27 rates come from a different Schedule to the Finance Act, 2026 and were not verified.
• No text quoted from the Income-tax Act, 1961 — its repositories return errors. Where a 1961 Act figure appears it rests on the 2025 Act re-enacting the same figure and the Department stating the position is unchanged.
• No Chapter VI-A ceilings, and no company or firm tax rates, which is why every worked example here is an individual proprietor. No penalty figure for a missed audit under the 1961 Act, and no claim that section 428(c) replaces it.
• Nothing on withdrawing or re-exercising the section 115BAC(6) option, on senior citizens' advance tax exemption under the 2025 Act, on the cash limits in sections 185 and 188, or on any restoration of the section 35(b) disallowance. Not captured, so not published. And no extension named — due dates can be extended by notification.

Where to go next

Filing for AY 2026-27: close the books, settle the presumptive-or-regular decision on numbers rather than habit, get the report in by 30 September if an audit applies, file by 31 August or 31 October, verify within 30 days. Business ITR filing is where we do that end to end.

Planning FY 2026-27: check whether last year's turnover made you a specified person, and whether advance tax is net of customer TDS.

Sources and currency

Applies to: India. Assessment year 2026-27 (income of FY 2025-26) is governed by the Income-tax Act, 1961, including for proceedings begun after 1 April 2026. Tax year 2026-27 (income of FY 2026-27) is governed by the Income-tax Act, 2025, which commenced on 1 April 2026 under its section 1(3). Both are live at the same time, and this page says which side each figure sits on.

Every threshold, rate, date and section reference on this page was read from the Gazette of India text of the Income-tax Act, 2025 and the Finance Act, 2026, from the Memorandum to the Finance Bill, 2025, and from the Income Tax Department's own e-filing guidance and the CPC-TDS brochure, on 19 and 20 August 2026. The Income-tax Act, 1961 was never captured — the official repositories return errors — so where a 1961 Act figure appears it is stated on the strength of the 2025 Act re-enacting it and the Department saying the position is unchanged, and that is disclosed. Anything we could not source is named in "What this page does not claim" rather than quietly left out. Income-tax provisions change at each Finance Act; confirm the current position before relying on a figure for a filing.

• Income-tax Act, 2025 (No. 30 of 2025) — Gazette of India Extraordinary, 21 August 2025 (s.1(3), s.35(b), s.58, s.62, s.63, s.185-188, s.263, s.392-402, s.404-408, s.424-428, s.536)
• Finance Act, 2026 (No. 4 of 2026) — Gazette of India Extraordinary, 30 March 2026 (s.2 and s.3 charging sections, s.5 and s.66 return due dates, s.96 substituting s.427 and s.428)
• Memorandum to the Finance Bill, 2025 — section 115BAC(1A) slab rates and the section 87A rebate for AY 2026-27
• Income Tax Department, e-filing portal — Income Tax Returns
• Income Tax Department, e-filing portal — returns and forms applicable, individual, AY 2026-27
• Income Tax Department, e-filing portal — Income Tax Forms
• Income Tax Department, e-filing portal — Tax Payments
• Income Tax Department, e-filing portal — TDS Compliance
• Income Tax Department, e-filing portal — ITR-V and the 30-day e-verification timeline
• TRACES (CPC-TDS, Income Tax Department) — The A-Z of TDS brochure (statement and certificate due dates)