Old vs New Regime & Form 10-IEA Advisor
Answer a few questions to find out whether you can choose the old regime, whether you must file Form 10-IEA, and by when.
Form 10-IEA and the old vs new regime, in plain English
From AY 2024-25 the new tax regime under section 115BAC(1A) is the default. Every individual and HUF is taxed under the new regime unless they positively choose the old regime. How you make that choice — and whether you need a form — depends on one thing: whether you have income from business or profession.
If you do NOT have business or professional income
If your income is only from salary, house property, capital gains, interest, dividends or other non-business sources (you file ITR-1 or ITR-2), you do not need Form 10-IEA. You simply select the old regime inside the return, and you can freely switch between the old and new regime every year. The only condition is timing: you must file the return on or before the section 139(1) due date. If you file a belated return, you lose the old-regime option for that year and are taxed under the new regime.
If you DO have business or professional income
If you have business or professional income (including presumptive income under 44AD/44ADA/44AE, filed on ITR-3 or ITR-4), you must file Form 10-IEA electronically, on or before the due date u/s 139(1), to opt out of the new regime into the old regime. The switch is strictly limited: a taxpayer with business income can move to old, and later switch back to new only once. After that switch back, the old regime cannot be chosen again for as long as the business or professional income continues (section 115BAC(6)).
Who must file Form 10-IEA (and who need not)
| Situation | Form 10-IEA? |
|---|---|
| Salaried / non-business taxpayer choosing old regime | Not required — choose in the ITR |
| Salaried / non-business taxpayer choosing new regime | Not required — new is default |
| Business/profession income, opting to OLD regime (first time) | Required — file to opt out |
| Business/profession income, already in old from an earlier year, continuing in old | Not required again — quote the original acknowledgement number |
| Business/profession income, moving from OLD back to NEW | Required — file to re-enter (final switch) |
| Business/profession income, already switched back to new | Old regime not available while business income continues |
Eligible filers are Individuals, HUFs, AOPs (other than co-operative societies), BOIs and Artificial Juridical Persons that have business or professional income.
The deadline trap
This is the single most common and most expensive mistake. Whether or not you have business income, the old regime is available only if the return (and, where applicable, Form 10-IEA) is filed on or before the section 139(1) due date. A belated return under section 139(4) is locked into the new regime — you cannot claim 80C, HRA, home-loan interest and the other old-regime deductions in a late return. For AY 2026-27 the standard due dates are 31 July 2026 (non-audit), 31 October 2026 (audit) and 30 November 2026 (transfer pricing), subject to any extension notified by the CBDT.
Frequently asked questions
What is Form 10-IEA?
Form 10-IEA is the online form through which a taxpayer with business or professional income opts out of the default new tax regime into the old regime, or later re-enters the new regime. It is prescribed under Rule 21AGA read with section 115BAC(6) and applies from AY 2024-25 onwards.
I only have salary income. Do I need Form 10-IEA to choose the old regime?
No. If you do not have business or professional income, you do not file Form 10-IEA. You choose the old regime directly in your ITR (ITR-1 or ITR-2) and can switch between old and new every year. Just make sure you file on or before the due date, because a belated return forces the new regime.
Who has to file Form 10-IEA?
Only taxpayers with business or professional income (Individuals, HUFs, AOPs other than co-operatives, BOIs and Artificial Juridical Persons filing ITR-3 or ITR-4) who want the old regime instead of the default new regime, or who want to switch back to the new regime.
What is the due date to file Form 10-IEA for AY 2026-27?
On or before the due date for filing the return of income under section 139(1) — standard dates are 31 July 2026 for non-audit cases, 31 October 2026 for tax-audit cases and 30 November 2026 for transfer-pricing cases, subject to any CBDT extension. A Form 10-IEA filed after the due date is treated as invalid.
What happens if I miss the due date or file a belated return?
You lose the old-regime option for that year. A belated return under section 139(4) is assessed under the new regime, so old-regime deductions such as 80C, HRA and home-loan interest cannot be claimed. For business taxpayers, a late Form 10-IEA is invalid and the old regime is denied.
How many times can I switch between the old and new regime?
If you have no business income, you can switch every year. If you have business or professional income, you can opt out to the old regime and switch back to the new regime only once in your lifetime; after switching back you cannot choose the old regime again while the business income continues.
I opted for the old regime last year using Form 10-IEA. Do I file it again this year?
No. Once you have opted out via Form 10-IEA, the old regime continues until you withdraw it. To keep the old regime you simply file your ITR quoting the original Form 10-IEA acknowledgement number. Filing the form again would be treated as re-entering the new regime.
Can a business taxpayer who already switched back to new ever return to the old regime?
Only if the business or professional income ceases. The once-in-a-lifetime lock in section 115BAC(6) applies while such income continues; if a taxpayer stops having business income, they are treated like any other non-business taxpayer and may choose the regime in the ITR.
Is Form 10-IE still required?
No. Form 10-IE applied up to AY 2023-24. From AY 2024-25 it has been replaced by Form 10-IEA for opting out of (or back into) the new regime.
Do the Income-tax Act 2025 changes affect Form 10-IEA?
The new tax regime stays the default under the Income-tax Act 2025, where Section 115BAC becomes Section 202. The opt-out option for business-income taxpayers continues and the form is re-notified under the Income-tax Rules 2026 (confirm the new form number on the portal). These apply from the tax year 2026-27; your FY 2025-26 return, filed in 2026, still uses Section 115BAC and Form 10-IEA. The switching rules are unchanged.
Which regime is better for me, old or new?
It depends on your deductions. As a rule of thumb, the old regime helps when you have large deductions (80C, HRA, home-loan interest, 80D). Use the CalcGuru income tax calculators to compare both regimes for your exact numbers before deciding.