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| TL;DR Summary: |
| Business owners and professionals must file Form 10-IEA to stay on the old tax regime, unlike salaried taxpayers who choose each year freely. The deadline is 31 July 2026 (non-audit) or 31 October 2026 (audit cases), and switching back to the new regime later is allowed only once in a lifetime. |
Business owners and professionals filing ITR-3 or ITR-4 must file Form 10-IEA to opt out of the new tax regime and continue under the old regime for AY 2026-27, on or before their return due date under Section 139(1) – 31 July 2026 for non-audit cases, 31 October 2026 if audited. Unlike salaried taxpayers, who can toggle regimes every year, business owners get only one lifetime switch back to the new regime after opting out once; after that, they’re locked into the new regime permanently. Missing the Form 10-IEA deadline forfeits the old regime for that year, regardless of how much tax it would have saved.
· If you’re salaried, switching between the old and new tax regime is almost a non-event. You pick one when you file your return, and if you change your mind next year, you just pick the other one. No forms, no lock-in, no drama.
· Business owners and professionals don’t get that luxury. If you run a business, freelance, or practice a profession, and you want to stick with the old tax regime, you have to say so formally – through a specific form, filed within a specific deadline, with a rule that limits how often you can flip back and forth. Get the paperwork wrong or miss the date, and the choice is made for you.
This guide walks through what that process looks like for AY 2026-27, what Form 10-IEA actually asks of you, and how to think about which regime suits your numbers.
1. Why Business Owners Face a Different Rule Than Salaried Taxpayers
The new tax regime has been the default since the Budget 2023 changes, and it still is for AY 2026-27 (income earned in FY 2025-26).
For most salaried individuals and pensioners filing ITR-1 or ITR-2, opting for the old regime is simply a checkbox inside the return – a decision they’re free to revisit every single year.
Business and professional income works differently because it isn’t a one-time, year-end computation the way salary is. Your accounting method, your depreciation schedule, your presumptive taxation status – these carry forward and interact with your regime choice in ways that a salaried person’s return doesn’t have to account for.
So the law asks business owners and professionals filing ITR-3 or ITR-4 to make a formal, on-record declaration if they want the old regime, rather than letting them toggle it silently each year.
That declaration is Form 10-IEA.
2. Form 10-IEA – What It Is and When It Must Be Filed
Form 10-IEA is the document that lets a taxpayer with business or professional income opt out of the default new regime and continue under the old regime. It’s filed electronically on the income tax e-filing portal, under the section for taxpayers with business or professional income, and verified through Aadhaar OTP, EVC, or a digital signature.
A few things to keep in mind for AY 2026-27:
• Who needs it: Individuals, HUFs, AOPs, BOIs, and firms with income under “Profits and Gains of Business or Profession” who want the old regime. If your only income is salary, house property, or capital gains, you don’t need this form – you opt out directly in ITR-1 or ITR-2.
• When to file it: On or before the due date for filing your return under Section 139(1). For most business owners and professionals not subject to audit, that’s 31 July 2026. If your accounts require an audit, the deadline extends to 31 October 2026, and cases involving a transfer pricing report get until 30 November 2026. If you’re not sure which deadline applies to you, our guide on whether your business needs a tax audit covers the Section 44AB thresholds that decide it.
• No late window: There’s no separate grace period for the form itself. If you miss the due date, the old regime simply isn’t available to you for that year – regardless of how much tax it might have saved.
• It has to match your return: Once filed, the acknowledgement number from Form 10-IEA needs to be quoted in your ITR-3 or ITR-4. File it for the wrong assessment year, or forget to reference it, and the regime selection can go wrong even if your intent was right.
In short, this isn’t a form you can leave for the last week. It needs to be filed, verified, and cross-referenced correctly before you even sit down to prepare your return.
3. The Once-in-a-Lifetime Switch-Back Rule Explained
This is the part that catches people off guard. If you have business or professional income and you opt out of the new regime using Form 10-IEA, you can switch back to the new regime later – but only once in your lifetime.
Here’s how that plays out in practice: say you file Form 10-IEA this year to stay on the old regime. A few years down the line, your deduction mix changes and the new regime starts looking better, so you file Form 10-IEA again to re-enter the new regime. That’s your one switch-back used. After that, if you want to move to the old regime again, you can’t – you’re locked into the new regime for good, as long as you continue to have business or professional income.
This restriction doesn’t apply to salaried taxpayers without business income – they can move between regimes every year without limit. It’s specifically a business/professional income constraint, and it’s exactly why this decision deserves more thought than a simple “which saves me more tax this year” calculation. You’re not just choosing for AY 2026-27; you’re potentially setting a path that’s difficult to reverse.
4. Old Regime Deductions Still Available to Businesses (80C, 80D, Depreciation)
The old regime’s main appeal has always been the deductions and exemptions it allows – over 70 of them, in various forms. For a business owner or professional, the ones that typically matter most include:
• Section 80C – up to ₹1.5 lakh for investments like PPF, ELSS, life insurance premiums, and principal repayment on a home loan.
• Section 80D – deduction for health insurance premiums, for yourself, your family, and your parents.
• Depreciation and business expense claims – the old regime doesn’t restrict business-related deductions the way it restricts personal exemptions; genuinely incurred business expenses remain claimable regardless of regime, but certain accelerated depreciation and incentive-linked claims are more favorable, or only available, under the old regime.
• HRA, LTA, and interest on housing loan (Section 24) – relevant if you also draw a salary component or have home loan interest to claim, alongside your business income.
• Deductions under Chapter VI-A more broadly – including 80E (education loan interest), 80G (donations), and others, none of which carry over into the new regime.
If your deduction claims genuinely add up to a large number relative to your income, the old regime can still work out cheaper even with its steeper slab rates and lower tax-free threshold of ₹2.5 lakh.
5. New Regime: Lower Slabs, No Deductions – When It Actually Wins
The new regime trades away almost all of those deductions in exchange for lower slab rates and a much higher tax-free threshold. For FY 2025-26 (AY 2026-27), the new regime slabs are:
| Income Slab | Rate |
| Up to ₹4,00,000 | Nil |
| ₹4,00,001 – ₹8,00,000 | 5% |
| ₹8,00,001 – ₹12,00,000 | 10% |
| ₹12,00,001 – ₹16,00,000 | 15% |
| ₹16,00,001 – ₹20,00,000 | 20% |
| ₹20,00,001 – ₹24,00,000 | 25% |
| Above ₹24,00,000 | 30% |
Combined with the Section 87A rebate (up to ₹60,000), a resident individual with net taxable income up to ₹12 lakh effectively pays no tax under the new regime. For salaried taxpayers, the ₹75,000 standard deduction pushes that effective tax-free point higher still – though business and professional taxpayers don’t get the standard deduction the way salaried employees do.
The new regime tends to work best when:
• Your deduction claims are modest – you don’t have a large home loan, big 80C investments, or significant health insurance premiums to claim.
• Your income sits in the bracket where the lower slab rates and the ₹12 lakh effective tax-free threshold outweigh what you’d have saved through deductions.
• You’d rather keep your compliance simpler, without tracking and substantiating multiple deduction categories every year.
6. A Simple Decision Framework Based on Your Deduction Mix
Rather than guessing, it helps to actually total up what you’d claim under the old regime and compare the resulting tax liability against the new regime’s slab-based calculation. As a rough starting point:
1. Add up your eligible deductions – 80C, 80D, home loan interest, any other Chapter VI-A claims, and business-specific deductions that differ by regime.
2. Compute tax under both regimes using your actual income figures, not approximations – the crossover point isn’t the same for everyone, since it depends on your income level as much as your deduction total.
3. Factor in the lock-in – remember that switching back later costs you your one lifetime option. If your deduction mix is likely to change substantially (say, your home loan gets paid off soon, or you’re winding down 80C investments), think about where you’ll land two or three years out, not just this year.
4. Consider audit and compliance load – the old regime, with its deduction claims, generally means more documentation and record-keeping. If that’s a genuine burden for your practice or business, weigh it alongside the tax numbers.
There’s no universal answer here – it genuinely comes down to your specific numbers. That’s the reason this decision is worth running past someone who can actually model both scenarios against your real income and deduction data, rather than relying on a general rule of thumb.
7. PKC’s Tax Regime Advisory for Business Owners
Choosing between the old and new regime isn’t a one-line decision for business owners and professionals – it involves your deduction mix, your income trajectory, the once-in-a-lifetime switch rule, and a filing deadline that doesn’t bend. Get it wrong, and you could be locked into a less favorable regime for years, or lose the old regime altogether for a year simply because Form 10-IEA wasn’t filed on time.
PKC’s tax advisory team works through this with business owners and professionals every filing season – modelling both regimes against actual numbers, handling the Form 10-IEA filing correctly and on time, and factoring in the longer-term impact of the switch-back rule before recommending a direction. If you’re weighing this decision for AY 2026-27, it’s worth a conversation before the 31 July deadline rather than after. This regime modelling is one part of the broader work our tax advisory team handle for business owners throughout the year, not just at filing time.
Frequently Asked Questions
Q1: Do business owners need to file Form 10-IEA every year?
No. You file it once to opt out of the new regime and continue under the old regime. You don’t need to refile it every year just to stay on the old regime – it only needs to be filed again if you want to change your election (for instance, switching back to the new regime).
Q2: Can I switch from the new regime back to the old regime later?
If you have business or professional income, you can switch back, but only once in your lifetime. Once you’ve used that one switch, you can’t move between regimes again for as long as you have business or professional income.
Q3: What deductions am I giving up under the new tax regime?
Most of the deductions available under Chapter VI-A – including 80C, 80D, HRA, LTA, and home loan interest under Section 24 – aren’t available under the new regime. Business expense deductions that are genuinely incurred for the business are still claimable, but certain incentive-linked and accelerated depreciation claims are old-regime specific.
Q4: Is the new regime always better for lower income?
Not automatically – it depends on how much you’d otherwise claim in deductions. At lower income levels, the new regime’s higher tax-free threshold often does work out better, but if you have significant 80C, 80D, or home loan interest claims, it’s worth running the actual numbers rather than assuming.
Q5: What happens if I file a belated return – can I still choose the old regime?
For business owners and professionals, Form 10-IEA has to be filed on or before the Section 139(1) due date. If that date is missed, the old regime isn’t available for that year, even if you file a belated return afterward.
Q6: Does Form 10-IEA apply to partnership firms and LLPs?
Form 10-IEA is meant for individuals, HUFs, AOPs, BOIs, and artificial juridical persons with business or professional income who have a choice between the old and new regimes under Section 115BAC. Partnership firms and LLPs are taxed under their own fixed rate structure and don’t have this old-vs-new regime choice, so this form doesn’t apply to them.
