Form 10-IEA AY 2026-27: Who Must File It Before 31 August & How to Choose the Old Tax Regime
If you earn income from a business or profession and want to choose the old tax regime for AY 2026-27, selecting the old regime while filing your income tax return may not be enough.
Eligible taxpayers having business or professional income generally need to file Form 10-IEA to opt out of the default new tax regime.
For eligible non-audit business and professional taxpayers whose return is due on 31 August 2026, Form 10-IEA should also be filed on or before that date.
This guide explains who needs Form 10-IEA, its due date, how to file it and what to check before choosing the old tax regime.
What Is Form 10-IEA?
Form 10-IEA is the prescribed form used by eligible taxpayers having income from business or profession to exercise their option under Section 115BAC.
The new tax regime is the default regime. Therefore, a business or professional taxpayer who wants to use the old tax regime generally needs to formally opt out of the new regime through Form 10-IEA.
The same form may also be used later if the taxpayer decides to re-enter the new tax regime, subject to the applicable switching rules.
Who Must File Form 10-IEA for AY 2026-27?
Form 10-IEA is mainly relevant to eligible taxpayers having income under the head Profits and Gains of Business or Profession who want to choose the old tax regime.
This may include eligible:
- Individuals;
- Hindu Undivided Families;
- Associations of Persons, subject to applicable conditions;
- Bodies of Individuals; and
- other eligible taxpayers covered by Section 115BAC.
It is particularly important for taxpayers filing ITR-3 or eligible ITR-4 cases involving business or professional income.
If you are unsure about your return form, read CompuTax's ITR Form Selection Guide for AY 2026-27.
Who Does Not Need Form 10-IEA?
A taxpayer who does not have business or professional income generally does not need Form 10-IEA simply to choose the old tax regime.
For example, a salaried individual filing ITR-1 or an individual filing ITR-2 without business income can generally exercise the regime choice through the applicable income tax return, subject to the prescribed rules.
| Taxpayer |
Form 10-IEA Required? |
| Salaried taxpayer with no business income |
No |
| Individual with capital gains but no business income |
No |
| Individual/HUF with business or professional income choosing old regime |
Generally Yes |
Form 10-IEA Due Date for AY 2026-27
Form 10-IEA must be filed on or before the applicable due date for filing the income tax return under Section 139(1).
Therefore, there is no single deadline for every taxpayer.
| Taxpayer Category |
Relevant Deadline |
| Eligible non-audit business/professional taxpayer |
31 August 2026 |
| General tax-audit case |
Applicable Section 139(1) audit-case deadline |
| Specified transfer-pricing case |
Applicable Section 139(1) deadline |
So, if your applicable ITR deadline is 31 August 2026 and you want to opt for the old regime, do not leave Form 10-IEA until after the return deadline.
Should Form 10-IEA Be Filed Before the ITR?
Yes. Form 10-IEA should be filed before completing the relevant income tax return.
Once filed successfully, the taxpayer receives an acknowledgement number and filing date. These details may be required while preparing the return.
The practical sequence should be:
Compare tax regimes → choose the preferred regime → file Form 10-IEA → save acknowledgement → file ITR.
Can Form 10-IEA Be Filed Every Year?
A taxpayer having business or professional income does not generally get unlimited freedom to switch between the old and new tax regimes every year.
If the taxpayer validly opts for the old regime, the option normally continues in subsequent years while business or professional income continues.
If the taxpayer later chooses to re-enter the new regime, special restrictions apply to switching back again.
This is why Form 10-IEA should not be filed merely because the old regime looks better by a small amount in one year. The future impact should also be considered.
Old vs New Tax Regime: What Should You Compare?
The old regime should not be selected only because you have investments or deductions. Similarly, the new regime should not be selected only because its slab rates look lower.
Prepare the complete tax computation under both regimes and compare the final tax liability.
Important factors include:
- business or professional income;
- salary and house-property income, if any;
- capital gains and other income;
- eligible Section 80C deductions;
- health insurance deduction under Section 80D;
- NPS contributions;
- housing-loan interest;
- other eligible deductions and exemptions;
- applicable rebate;
- brought-forward losses; and
- income taxable at special rates.
For a broader comparison, read CompuTax's Old vs New Tax Regime guide.
How to File Form 10-IEA Online
Form 10-IEA can be filed through the Income Tax e-Filing portal.
- Log in to the Income Tax e-Filing portal.
- Go to e-File → Income Tax Forms → File Income Tax Forms.
- Search for and select Form 10-IEA.
- Select AY 2026-27.
- Confirm that you have business or professional income.
- Select the correct applicable return due date.
- Choose the relevant option for opting out of or re-entering the new tax regime.
- Review the taxpayer and declaration details.
- Complete electronic verification.
- Save the acknowledgement number and filing date.
After filing, it is advisable to check the form status under the filed-forms section of the e-Filing portal.
What Happens If Form 10-IEA Is Filed Late?
If Form 10-IEA is filed after the applicable Section 139(1) due date, the taxpayer may not receive the intended benefit of opting for the old tax regime for that year.
This is important because filing a belated ITR later does not automatically cure a missed Form 10-IEA deadline.
For taxpayers whose applicable deadline is 31 August 2026, the safer approach is to complete the regime comparison and Form 10-IEA filing several days before the deadline.
Common Form 10-IEA Mistakes to Avoid
- Assuming every taxpayer choosing the old regime needs Form 10-IEA.
- Filing the ITR before completing Form 10-IEA.
- Selecting the wrong return due date in the form.
- Waiting until 31 August to compare both regimes.
- Ignoring previous Form 10-IEA filings and regime history.
- Choosing the old regime only because deductions are available.
- Assuming a business taxpayer can freely switch regimes every year
How Income Tax Software Helps
The difficult part of Form 10-IEA is not filing the form itself. It is deciding which tax regime gives the better result.
For CA firms handling multiple business and professional returns, manually preparing two tax computations for every client can consume significant time.
CompuTax Professional Income Tax Software helps tax professionals manage income and tax computation, applicable deductions, loss adjustment, Form 26AS data and return-filing workflows from one system.
This makes it easier to compare tax liability before finalising the client's regime and filing Form 10-IEA.
Frequently Asked Questions
What is the due date for Form 10-IEA for AY 2026-27?
The form must be filed on or before the taxpayer's applicable Section 139(1) ITR due date. For eligible non-audit business and professional taxpayers covered by the August deadline, this is 31 August 2026.
Is Form 10-IEA mandatory for ITR-3?
It is generally required where an eligible taxpayer having business or professional income wants to opt out of the default new tax regime and choose the old regime.
Do salaried taxpayers need Form 10-IEA?
Generally no, if they do not have business or professional income.
Can Form 10-IEA be filed after the ITR?
It is advisable to file Form 10-IEA first so its acknowledgement details can be used in the return and the statutory deadline is not missed.
Can a business taxpayer change tax regimes every year?
No. Switching restrictions apply to taxpayers having business or professional income, so the decision should be made after considering both current and future tax impact.
Conclusion
Form 10-IEA is an important compliance requirement for eligible taxpayers having business or professional income who want to choose the old tax regime for AY 2026-27.
If your applicable return due date is 31 August 2026, complete the old-vs-new regime comparison early, file Form 10-IEA within the deadline and preserve the acknowledgement before submitting your income tax return.
For CAs and tax professionals managing multiple business returns,CompuTax Professional Income Tax Software can simplify tax computation and return preparation and help make the regime decision using complete client data.
Disclaimer
This article is for general informational purposes and reflects the applicable guidance available as of 19 August 2026. Tax-regime eligibility, Form 10-IEA requirements and filing deadlines depend on the taxpayer's individual circumstances and may change through subsequent notifications or government announcements. Verify the latest position on the official Income Tax Department portal or consult a qualified tax professional before filing.