New Tax Regime Is Default: How to Opt for Old Regime in AY 2026-27

For AY 2026-27, compare old and new regimes before filing. Learn when old-regime deductions, HRA, home loan interest, and business rules need review.

This guide is written for Indian taxpayers preparing FY 2025-26 income returns in AY 2026-27. It follows an evidence-first style because most filing mistakes do not start in the final submit button. They start earlier, when the taxpayer selects the wrong assessment year, trusts an incomplete prefill, treats AIS and Form 26AS as interchangeable, or picks ITR-1 when a different form is required.

Use this article as a practical review note before filing. It is not a promise of refund, processing speed, or notice avoidance. The goal is to help you organise facts, choose the correct route, and know when a CA review is sensible.

Key points

Official position to keep in mind

Taxpayers should compute tax under the eligible regime and ensure the return treatment matches the selected regime. Business or profession cases can have additional regime-switching rules.

The official portal material should be treated as the rule source. Competitor blogs are useful for understanding what taxpayers are searching for, but the final filing position should be checked against the Income Tax Department portal, notified forms, validation rules, and the taxpayer's own documents.

Practical example

A salaried taxpayer with HRA, 80C, 80D, and home loan interest may still compare old regime. A consultant with professional income should check whether additional forms or restrictions apply.

Work through the example in three passes. First, identify the assessment year and the correct taxpayer profile. Second, identify the income head, ITR form, and schedule. Third, match tax credits and supporting documents. If any pass fails, pause before filing because that is where notices, refund delays, and defective-return issues usually begin.

Documents and evidence to keep ready

• Form 16
• HRA and rent proof
• 80C and 80D proofs
• Home loan certificate
• AIS and Form 26AS

Keep these documents in one folder with a short computation note. A simple note saying "why this number is in the return" is useful when a Form 16 amount, AIS entry, broker statement, bank interest, or tax challan needs to be explained later.

Filing checklist

• Confirm the correct assessment year is AY 2026-27 for FY 2025-26 income.
• Match the article topic to the correct income head and return form.
• Compare Form 16 or Form 16A with AIS, TIS, Form 26AS, bank records, and broker or business records where relevant.
• Keep a note for every mismatch, correction, deduction, refund, or notice-sensitive position.
• File only after the figures are supportable and e-verify the return on time.

Mistakes to avoid

• Assuming default means best.
• Claiming old-regime deductions under new regime.
• Ignoring business-income switching rules.
• Not preserving proofs.

The most expensive mistake is often choosing the wrong route. A revised return, rectification request, AIS feedback, ITR-U, demand payment, grievance, and notice reply solve different problems. Do not use one route just because it is visible on the portal.

Useful MyeCA paths

• New vs old regime salary guide
• Can salaried switch regime
• Regime comparator
• Choose your ITR form
• Income tax calculator
• Start CA-assisted filing

Use calculators and tools as a preparation layer, not as a substitute for checking final documents. If the case includes capital gains, foreign assets, business income, a large refund, tax-credit mismatch, or a notice, review the position before filing.

For adjacent reading, keep the complete AY 2026-27 filing guide and the AY 2026-27 form-selection guide open while reviewing the file. For a CA-assisted next step, use expert consultation.

Frequently asked questions

Should I compare regimes every year?

Yes, because income, deductions, and eligibility can change.

Is old regime always worse now?

No. It can still help where eligible deductions and exemptions are substantial.

Should I get CA review before filing?

Use CA review when the facts are not routine, when there is refund or notice risk, or when the return includes capital gains, trading income, foreign assets, business income, regime changes, or AIS/TDS mismatch.

CA technical review note

For this topic, the reviewer should document the selected assessment year, taxpayer status, ITR form, income head, tax regime, source records, and the reason each major figure appears in the return. If the position depends on timing, such as Form 16 issue, AIS updates, TDS return processing, e-verification, revised-return deadline, or notice response window, write the date next to the decision.

The minimum file should include the computation, portal downloads, source statements, challans, acknowledgement, and correspondence. The article should not be read as legal advice for a specific taxpayer without checking that taxpayer's documents.

Final takeaway

Default regime does not remove comparison. Old regime needs deduction evidence. Business taxpayers need stricter review. Treat this topic as one part of the full AY 2026-27 filing file. A clean return is created by consistent treatment across the return, supporting records, tax credits, schedules, declarations, and verification.