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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →For an Indian individual, switching regimes is done in the income-tax return itself if you have no business or professional income. If you do have eligible business or professional income and want the old regime, you must file Form 10-IEA by the section 139(1) due date, then enter its acknowledgement details in your ITR. Telling your employer which regime to use for payroll withholding does not complete this legal election.
This guide applies to India’s regimes under section 115BAC. The exact return labels, rates, deductions and deadlines can change by assessment year, so use the instructions for the assessment year you are filing.
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First identify which income category applies to you
The filing route depends on whether your total income includes business or professional income. Your employer’s payroll setting is not the deciding factor; the statutory election is made through the return process, with an additional form for eligible business and professional cases.
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| Your situation | How to choose the old regime | Timing | Future-choice effect |
|---|---|---|---|
| No business or professional income | Select the applicable opt-out choice in the ITR | Each year, on or before the section 139(1) due date | You may make the choice annually, subject to filing by the due date |
| Eligible business or professional income | File Form 10-IEA, then report its acknowledgement number and filing date in the ITR | Form 10-IEA and the ITR must meet the applicable section 139(1) deadline | Opting out and later re-entering the new regime is restricted |
The Income Tax Department describes the new regime as the default for specified taxpayer classes, while allowing eligible taxpayers to opt out for the old regime. “Default” does not mean that an employee’s payroll declaration has made the final choice for the return.
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How the annual switch works when you have no business or professional income
This is generally the simpler case, covering taxpayers whose income is, for example, salary, pension, interest, rent or other non-business income and who are otherwise eligible to file the relevant return. You make the regime choice directly in the ITR for that assessment year.
Step 1: Gather the figures for the assessment year
- Identify the financial year and corresponding assessment year for the return.
- Collect salary or pension information, interest and other income, tax deducted at source and advance-tax details.
- List only deductions and exemptions that you are actually entitled to claim for that year.
- Keep evidence supporting any deduction or exemption in case the department later asks for it.
Do not decide from a previous year’s result alone. Income, deductions, exemptions and the applicable provisions can change from one assessment year to the next.
Step 2: Prepare a comparison before selecting the option
Calculate the tax payable under both regimes using the year’s official rates and the deductions permitted under each regime. The old regime generally allows a wider range of deductions and exemptions; the new regime generally uses lower rates in exchange for more limited deductions and exemptions. Your own eligible claims determine the result.
Step 3: Select the opt-out choice in the ITR if the old regime wins
When completing the return, use the regime question in the applicable form and select the choice to opt out of the new regime. The department’s guidance identifies an opt-out choice in ITR-1 and ITR-2 and also in ITR-3, ITR-4 and ITR-5. Non-business taxpayers will commonly use ITR-1 or ITR-2, depending on their income and eligibility.
If you keep the default new-regime selection, the return will be processed on that basis. Check the tax computation and the regime field before final submission.
Step 4: File and verify by the section 139(1) due date
The annual choice is effective through the return only when the ITR is filed on or before the due date prescribed under section 139(1). Complete verification as part of the filing process and retain the acknowledgement. A payroll declaration made earlier in the year does not replace this return-level action.
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How to switch to the old regime when you have business or professional income
An eligible taxpayer with business or professional income cannot rely solely on an ITR checkbox. To opt out of the default new regime, the required election is Form 10-IEA.
Step 1: Confirm that the business/professional route applies
Use this route when your return includes income from a business or profession and you are eligible to exercise the old-regime option. If you are uncertain whether a particular receipt is business or professional income, resolve that classification before filing because it changes both the form requirement and the consequences of switching later.
Step 2: File Form 10-IEA before the return
- Complete Form 10-IEA for the relevant assessment year in the income-tax e-filing system.
- Submit it no later than the applicable section 139(1) due date.
- Save the acknowledgement number and the date of filing shown after submission.
- File the ITR after Form 10-IEA, using those acknowledgement details where the return asks for them.
The department advises filing Form 10-IEA before filing the return. Treat the form and the return as linked steps rather than independent choices.
Step 3: Enter the acknowledgement details accurately
The ITR requires the Form 10-IEA acknowledgement number and filing date. Copy both from the submitted form record. A mismatch can prevent the return from reflecting the intended election, so review the numbers before submitting and verifying the ITR.
Step 4: Do not rely on a late Form 10-IEA
The department’s guidance does not treat a late Form 10-IEA as a valid way to obtain old-regime treatment for that return. If the form was not filed by the applicable deadline, do not assume that filing it after the deadline cures the omission. Check the assessment-year instructions or obtain qualified tax advice before taking a filing position.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWhat your employer’s regime declaration actually does
An employee can tell an employer which regime they intend to use so that tax may be withheld during the year. That communication helps payroll withholding but is not the statutory opt-out under section 115BAC.
The Income Tax Department’s FAQ expressly says that intimation to the employer does not amount to exercising the option to opt out of the new regime. You must still make the election through the ITR if you have no business or professional income, or through timely Form 10-IEA plus the ITR if you do.
If payroll withholding used the other regime
Payroll withholding and final tax liability are separate calculations. When filing, prepare the return under the regime you are legally choosing and claim the tax deducted at source shown in your records. A difference between payroll withholding and final liability can result in additional tax payable or a refund; it does not by itself change which regime you elected.
How to decide which regime is better for your return
There is no universal winner. Compare the actual tax result for the assessment year, not just the headline slab rates.
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| Comparison question | Why it matters | What to record |
|---|---|---|
| What is the tax payable under each regime? | The regime with the lower final liability may be preferable, assuming you can validly elect it. | Taxable income, surcharge or cess where applicable, taxes paid and balance payable/refund under each calculation. |
| Which deductions and exemptions can you actually claim? | The old regime permits various deductions and exemptions, while the new regime limits many of them. | Each eligible claim, its amount and the regime in which it is allowed. |
| Do you have business or professional income? | This changes the election method and can restrict future choices. | Whether Form 10-IEA is required, its filing date and acknowledgement number. |
| Can you meet the section 139(1) deadline? | The timing requirement determines whether the election is effective. | The applicable due date and evidence of timely ITR filing; for business/professional cases, timely Form 10-IEA as well. |
Build two side-by-side calculations
- Start with the same gross income, tax deducted at source and other tax payments in both columns.
- Apply only the deductions and exemptions available under the old regime in the old-regime column.
- Apply the new-regime rules to the second column; do not carry old-regime deductions across automatically.
- Compare the resulting tax liability and cash effect, including any additional payment required at filing.
- Check that the regime you prefer is legally available for your income type and that the required filing deadline can be met.
The department publishes assessment-year-specific tax tables and guidance. For example, a table for AY 2026–27 should be read as applying to that assessment year and to the taxpayer category covered by the table, not as a permanent rate card.
Longer-term consequences for business and professional taxpayers
The annual flexibility available to non-business taxpayers does not apply in the same way when business or professional income is present. After opting out of the new regime, an eligible business or professional taxpayer may re-enter the new regime only once in a subsequent assessment year. After re-entry, the old-regime option generally cannot be exercised again while the taxpayer continues to have business or professional income.
Plan the decision beyond one return
- Project expected business or professional income and deductions for future years, not just the current year.
- Record whether you have already used the one-time re-entry opportunity.
- Keep copies of Form 10-IEA acknowledgements and the related ITRs so you can establish your election history.
- Recheck the rule if your income composition changes, because the restriction is tied to continuing business or professional income.
This future-choice restriction is a major reason not to switch solely because one year produces a small saving.
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Common mistakes and how to correct your process
Mistake: treating the employer declaration as the election
Fix: Complete the regime selection in the ITR, or file Form 10-IEA first when the business/professional route applies.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteMistake: filing the ITR before Form 10-IEA
Fix: Submit Form 10-IEA first, save its acknowledgement number and filing date, then enter them in the ITR. Do not assume a later form filing will validate an earlier return.
Mistake: submitting Form 10-IEA after the deadline
Fix: Check the applicable section 139(1) deadline before filing. The department does not treat a late form as a valid old-regime election for that return.
Mistake: carrying deductions from the old regime into the new regime
Fix: Rebuild the calculation under each regime using only the deductions and exemptions allowed under that regime for the assessment year.
Mistake: choosing from a prior-year result
Fix: Recalculate with this year’s income, claims, rates and assessment-year instructions.
Mistake: failing to check the form and return after submission
Fix: Confirm the ITR acknowledgement, the selected regime, and—where applicable—the Form 10-IEA number and filing date. Keep these records with your tax documents.
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A practical filing checklist
- Confirm that the return is for India and identify the correct financial year and assessment year.
- Classify whether you have business or professional income.
- Calculate liability under both regimes using the rules for that assessment year.
- List deductions and exemptions actually available under each regime.
- Identify the section 139(1) due date that applies to your return.
- If you have no business or professional income, select the opt-out choice in the ITR if choosing the old regime.
- If you have eligible business or professional income, file Form 10-IEA by the deadline before filing the ITR.
- Enter the Form 10-IEA acknowledgement number and filing date in the ITR.
- Do not treat an employer’s payroll declaration as the statutory election.
- Submit and verify the ITR by the applicable deadline, then retain the acknowledgements.
Example timelines
Non-business taxpayer
You compare both regimes, decide that the old regime is valid and produces the lower liability, select the opt-out choice while preparing the applicable ITR, and file and verify that return by the section 139(1) due date. No Form 10-IEA is required for this non-business route.
Business or professional taxpayer
You compare both regimes, decide to opt out, file Form 10-IEA before the ITR and before the section 139(1) deadline, note the acknowledgement number and filing date, enter them in the ITR, and then file and verify the return. Filing the form after the deadline is not a reliable cure.
Employee whose payroll used the new regime
Your employer’s withholding choice does not prevent a valid return-level election. If you are otherwise a non-business taxpayer, make the old-regime choice directly in the ITR by the due date and reconcile the tax deducted at source with the final computation.
Dates, labels and rules can change
The Income Tax Department’s guidance checked for this article covers AY 2026–27 and explains the new-versus-old-regime and Form 10-IEA procedures. Portal field labels, tax rates, deduction rules and due dates are assessment-year-specific. Before filing, open the instructions and FAQs for your own assessment year and confirm the current section 139(1) deadline.
The department’s FAQ also illustrates the same issue for FY 2023–24 (AY 2024–25): a taxpayer wanting the old regime must follow the correct route rather than relying on an employer declaration. Use that example as an explanation of the process, not as a current deadline or rate reference.
The direct answer
If you have no business or professional income, switch from the default new regime by selecting the old-regime opt-out in your ITR and filing by the section 139(1) due date. If you have eligible business or professional income, file Form 10-IEA by that deadline before filing the ITR, then report its acknowledgement details. In both cases, compare your actual assessment-year tax outcome first, and remember that an employer’s declaration is not the legal election.
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