"Business tax filing" covers a lot of ground, and the specifics change quite a bit depending on how your business is structured. A sole proprietor, a partnership firm, an LLP, and a private limited company are all technically "filing business taxes," but they use different ITR forms, follow different deadlines, and in some cases are taxed at genuinely different rates. Getting the wrong form or missing the wrong deadline is a common — and avoidable — source of penalties.
Here's how business tax filing actually breaks down by entity type, and the deadlines that matter for the current filing cycle.
Filing the wrong form isn't just a paperwork inconvenience — a return filed on the wrong form can be treated as defective under Section 139(9), and you'd need to correct and refile it within the window the department gives you.
This is where a lot of confusion comes from, since the deadline isn't fixed by entity type alone — it depends on whether a tax audit applies to your accounts.
Without a tax audit requirement — sole proprietors and firms filing ITR-3 or ITR-4 without needing an audit are generally due by the end of August.
With a tax audit requirement — companies filing ITR-6, and any firm or proprietorship whose accounts require audit under Section 44AB, are due by the end of October. Companies specifically always file ITR-6 by this deadline regardless of size, since they're required to be audited under the Companies Act even where the Income Tax Act audit threshold wouldn't otherwise apply.
Transfer pricing cases — businesses with international or specified domestic transactions requiring a report under Section 92E get a later deadline, typically the end of November.
The tax audit report itself (Form 3CA/3CB along with 3CD) has to be filed roughly a month before the ITR deadline, since your chartered accountant's audit needs to be on record before the return referencing it can be submitted.
Under Section 44AB, a tax audit generally applies to:
Missing this requirement isn't a minor lapse — the penalty is 0.5% of turnover, capped at ₹1.5 lakh, on top of whatever late filing consequences follow.
If your turnover is within the prescribed limits, Sections 44AD, 44ADA, and 44AE let you declare income at a deemed rate — generally 8% of turnover (6% for digital receipts) for eligible businesses, or 50% of gross receipts for specified professionals — without maintaining detailed books of account or going through a tax audit. It's a genuinely useful simplification for smaller operations, though opting in and out isn't entirely free of consequences: switching out of the scheme after using it can restrict your ability to opt back in for several years, so it's worth thinking through before choosing it purely for convenience.
Companies don't all pay the same rate. The applicable rate depends on turnover and which tax regime the company opts into:
Choosing between the standard regime and a concessional one isn't automatic — it's an election that needs to be made and, in some cases, can't easily be reversed, so it's worth working through the numbers for your specific situation rather than defaulting to whichever rate sounds lowest on paper.
If your estimated tax liability for the year exceeds ₹10,000, you're generally required to pay advance tax in instalments through the year rather than settling everything at filing time. Businesses under the presumptive scheme have their own simplified advance tax timeline, typically a single instalment rather than the standard quarterly schedule. Missing these instalments attracts interest under Sections 234B and 234C, which is easy to overlook until the final tax computation shows an unexpected interest charge.
Companies file ITR-6, regardless of size or whether their accounts require a tax audit under the Income Tax Act, since they're separately required to be audited under the Companies Act, 2013.
For sole proprietors and firms filing ITR-3 or ITR-4 without an audit requirement, the deadline generally falls at the end of August. Businesses requiring a tax audit have a later deadline, typically the end of October.
Not automatically. If a business under presumptive taxation declares profit below the deemed presumptive rate and its total income exceeds the basic exemption limit, an audit can still be required regardless of the presumptive scheme.
No. Any taxpayer, business or otherwise, whose estimated tax liability for the year exceeds ₹10,000 is generally required to pay advance tax in instalments, though presumptive taxpayers follow a simplified single-instalment timeline.
It attracts a penalty of 0.5% of turnover, capped at ₹1.5 lakh, separate from any consequences for filing the return itself late.
If a return is filed on an incorrect form for the entity type, it can be treated as a defective return under Section 139(9), and the taxpayer is given a window to correct and refile it in the proper form.