Form 10-IEA 2026: The Form Business and Professional Income Filers Need to Opt for the Old Tax Regime

By Nitish Bharadwaj · Published Aug 24, 2026 · 6 min

Since FY 2023-24, the new tax regime is the default for every taxpayer, but the mechanics of choosing otherwise differ sharply by income type. Salaried filers without business income simply select their regime inside ITR-1 or ITR-2 each year, free to switch annually. Anyone with business or professional income must instead file Form 10-IEA on the e-filing portal before submitting ITR-3 or ITR-4, referencing its acknowledgment number in the return. Miss that deadline and the new regime applies regardless of intent. This guide covers who must file, the deadline, and the one-time switch-back rule.

The new tax regime has been the default since FY 2023-24, and if your income is only salary, house property, capital gains, or interest, choosing the old regime instead is as simple as ticking a box inside your ITR — no separate paperwork, and you can flip the choice again next year. Business and professional income changes that entirely. If you file ITR-3 or ITR-4 and want the old regime's deductions, you need to submit Form 10-IEA before you even open your ITR, on or before your filing due date — miss it, and the new regime applies whether you intended that or not.

Who Actually Needs This Form

The dividing line is whether you have any income under 'Profits and Gains of Business or Profession.' If you don't — you're purely salaried, or your income comes from a pension, house property, capital gains, or interest — you never touch Form 10-IEA. The regime choice sits directly inside ITR-1 or ITR-2 as a simple selection, and you're free to pick differently every single year depending on which regime works out cheaper that year. The moment any business or professional income enters the picture — a consultancy fee, freelance income reported under Section 44ADA, or a proprietorship business under Section 44AD — the ITR form changes to ITR-3 or ITR-4, and opting for the old regime now requires this separate form filed in advance.

The Deadline Is Before Your ITR, Not With It

Form 10-IEA has to be filed and verified on the income tax portal before you file the return itself, because the ITR-3 or ITR-4 form asks you to enter the Form 10-IEA acknowledgment number and filing date when you claim the old regime — there's no way to file both simultaneously. The due date for the form tracks the ITR due date that applies to your case: for AY 2026-27, that's August 31, 2026 for ITR-3 and ITR-4 filers not subject to a statutory audit, and October 31, 2026 if a tax audit under Section 44AB applies. Our complete ITR filing guide for AY 2026-27 has the full deadline table across every filer category.

The One-Time Switch-Back — And Why It's Not Actually Permanent

A common misunderstanding is that opting for the old regime as a business or professional taxpayer locks you out of the new regime forever. It doesn't, quite. Once you've filed Form 10-IEA to opt out of the new regime, that choice carries forward automatically to future years without needing to refile — you don't need to submit it again each year just to stay in the old regime. If you later want to move back to the new regime, you can, by filing Form 10-IEA again to withdraw the earlier option — but only once, for as long as you continue to have business or professional income. Use that one switch-back, and you cannot opt out to the old regime again while business income continues, though the restriction lifts entirely if your business income stops in a later year.

How to File Form 10-IEA — Step by Step

1. Log in at incometax.gov.in and go to e-File → Income Tax Forms → File Income Tax Forms.
2. Search for 'Form 10-IEA' and select the relevant Assessment Year — 2026-27 for income earned in FY 2025-26.
3. Answer whether you're opting out of the new regime (first-time opt-out) or withdrawing a previous opt-out (switching back to new regime).
4. Review the auto-filled details, submit, and e-verify using Aadhaar OTP, net banking, or a digital signature certificate.
5. Note the acknowledgment number and filing date generated — you'll enter both when you file ITR-3 or ITR-4 and select the old regime.

Miss the Deadline and the Choice Is Made for You

If Form 10-IEA isn't filed by the due date under Section 139(1) that applies to you, the new regime applies by default for that year — regardless of what deductions you were planning to claim. This doesn't get corrected by filing a belated return afterward; the option to opt out of the new regime has to be exercised within the original due date, not the extended one. Our belated ITR filing guide covers the separate penalty and interest that apply to late filing generally, but neither fixes a missed Form 10-IEA deadline.

The Bottom Line

If you have business or professional income and the old regime's deductions genuinely work in your favour, file Form 10-IEA well before your ITR due date — not on the last day, since the ITR itself needs its acknowledgment number. Remember it isn't a yearly ritual like it is for salaried filers: get the decision right, because you only get one clean chance to reverse it later.