Form 10-IEA E-Filing Guide: Opting In and Out of Old Tax Regime for Business Entities

When the Central Board of Direct Taxes made the New Tax Regime under Section 115BAC the default tax regime, it introduced a fundamental procedural distinction between salaried taxpayers and individuals carrying on business or profession. Under the Income-tax Act, 1961 — which continues to govern FY 2025-26 (AY 2026-27), the year currently being filed for — this distinction still drives who needs to file Form 10-IEA and, more importantly, how many times they are allowed to change their mind. The Income Tax Act, 2025 carries forward the same regime-choice architecture from Tax Year 2026-27 onward under its own renumbered structure.

While salaried taxpayers can switch between the old and new regimes freely inside their ITR form each year, anyone filing ITR-3 (Business/Profession) or ITR-4 (Sugam Presumptive) must electronically submit Form 10-IEA to exercise or withdraw their regime choice, and that choice is far less flexible than most business owners assume.

1. Why Form 10-IEA Is Crucial for Business Owners & Professionals

Under Section 115BAC(6), if you derive income from:

• A sole proprietorship business or trading firm,
• A partner's share of profit or remuneration from a partnership firm or LLP,
• Professional practice (doctors, engineers, advocates, consultants, chartered accountants),
• Speculative business, intraday trading, or F&O derivative trading (all treated as business income),

you cannot opt for the Old Tax Regime directly inside the ITR utility. You must first furnish Form 10-IEA on the Income Tax e-Filing portal before validating your return, and quote the resulting acknowledgment number and filing date in the return itself.

Critical Deadline: Form 10-IEA must be filed on or before the due date specified under Section 139(1) for filing the original return (31st July for non-audit salaried cases; the applicable non-audit business/professional date for ITR-3/ITR-4, or the tax-audit due date where audit applies). If you file a belated return under Section 139(4) after missing the original due date, the option to claim the Old Tax Regime is permanently lost for that financial year — you cannot retroactively file Form 10-IEA to rescue a belated return.

2. The Single Most Important Nuance: Who Gets Yearly Flexibility, and Who Gets One Switch for Life

This is where most confusion arises, because the rule is genuinely different depending on whether the taxpayer has business or professional income:

For a salaried individual, Form 10-IEA never enters the picture — the regime choice is made afresh in the ITR form itself each year, with no lifetime restriction and no separate form.

For a taxpayer with business or professional income, the sequence is fixed and one-directional beyond a single reversal:

1. Default position: New Tax Regime applies automatically unless Form 10-IEA is filed to opt out.
2. First opt-out: The taxpayer can file Form 10-IEA once to move to the Old Regime (to claim deductions such as Section 80C, 80D, 80-IAC, home loan interest, or unabsorbed depreciation carried forward from earlier years).
3. One re-entry allowed: If the taxpayer later decides to withdraw that opt-out and return to the New Regime, a second Form 10-IEA filing (marked "Re-entering New Tax Regime") is permitted — but only once.
4. Permanent lock-out: Having opted out and then re-entered the New Regime, the taxpayer with business/professional income is permanently barred from opting into the Old Regime again for as long as that business or professional income continues — in any future financial year, without exception.

Practical Warning: This "once opted out, once re-entered, then locked" sequence is irreversible and does not reset annually the way it does for salaried taxpayers. A proprietor who opts out of the New Regime in FY 2024-25 to claim Old Regime deductions, then re-enters the New Regime in FY 2025-26 because it produces a lower tax outflow that year, has permanently exhausted both moves. Even if a future year's numbers would clearly favour the Old Regime again, the law does not permit a third switch while business income continues. The only way the cycle resets is if the taxpayer's business or professional income ceases entirely (for example, the business is discontinued) — at which point, on any subsequent return without business income, the taxpayer reverts to the salaried-style yearly flexibility.

Given this asymmetry, the decision to file Form 10-IEA and opt out of the New Regime should never be made purely on a single year's tax computation — it should be modelled against at least the next two to three years of expected income, deduction eligibility, and depreciation position, since the second switch (if used) closes the door permanently.

3. Step-by-Step E-Filing Process for Form 10-IEA

1. Portal Login: Log into incometax.gov.in using the taxpayer's PAN and password.
2. Navigate to Statutory Forms: Go to e-File > Income Tax Forms > File Income Tax Forms.
3. Select Form 10-IEA: Choose Application for exercise/withdrawal of option under Section 115BAC(6).
4. Choose Assessment Year: Select AY 2026-27 (for FY 2025-26).
5. Declare Option:
   • Select Opting Out of New Tax Regime (if choosing the Old Regime with Chapter VI-A deductions).
   • Select Re-entering New Tax Regime (if withdrawing a previous opt-out — available only once).
6. Enter Business Particulars: Provide the Nature of Business/Profession code and confirm whether any unit is located in an International Financial Services Centre (IFSC), which carries separate concessional provisions.
7. Verification: Verify using Aadhaar OTP, Electronic Verification Code (EVC), or a Digital Signature Certificate (DSC).
8. Quote in ITR: Enter the 15-digit Form 10-IEA acknowledgment number and filing date in Schedule "Part A – General" of ITR-3 or ITR-4 before submitting the return.

4. Common Compliance Traps & Practical CA Advice

• Missing Acknowledgment Number: If the Form 10-IEA acknowledgment number and date are not correctly entered in the ITR, CPC's processing system will treat the return as filed under the default New Regime regardless of intent, and may issue a demand notice with interest under Sections 234A/234B/234C for tax computed under the wrong regime.
• Deductions Disallowance on Late Filing: If Form 10-IEA is filed after the applicable Section 139(1) due date, CPC disallows Old Regime deductions (80C, 80D, 80G, home loan interest, and others) even if the ITR itself is filed within the belated-return window.
• Confusing "switching every year" with the business-income rule: Taxpayers who also hold salary income alongside business income frequently assume they retain the salaried taxpayer's annual flexibility. The presence of any business or professional income — however small — pulls the entire return into the one-time-switch regime under Section 115BAC(6), not the yearly-flexibility regime.
• Presumptive taxpayers under Section 44AD/44ADA: These filers are business/professional taxpayers for this purpose and are equally bound by the once-in-a-lifetime switch restriction, even though their income computation is presumptive.

5. Practical Filing Checklist

1. Confirm whether the taxpayer has any business, professional, partnership, or F&O trading income — this alone determines whether Form 10-IEA applies.
2. Check the taxpayer's Form 10-IEA filing history before advising a switch — has an opt-out already been used, and if so, has the one permitted re-entry also been used?
3. Model at least two to three years of projected income and deductions before recommending an opt-out, given that a second switch permanently closes the Old Regime door.
4. File Form 10-IEA strictly before the applicable Section 139(1) due date — never rely on the belated-return window as a fallback.
5. Cross-check the Form 10-IEA acknowledgment number is correctly reflected in the ITR before final submission.

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