Deductions Under Section 123 and Schedule XV: 80C Transition Guide
A practical old-regime deduction guide for taxpayers mapping familiar 80C-style deductions to the new income-tax law references.
With the Income-tax Act, 2025 now in the picture, many taxpayers are navigating a transition that looks deceptively simple on the surface. The investments are the same — ELSS, EPF, life insurance premiums, tuition fees. The deduction logic is familiar. But the legal references have shifted, and filing without checking whether a familiar claim maps correctly to the new Act can create silent errors. This guide helps taxpayers and their advisers work through that mapping exercise for AY 2026-27.
This is an educational readiness note, not a guarantee of any tax outcome. Match every position against the official portal, notified forms, and the taxpayer's own documents.
What the transition changes in practice
The labelling of deductions has moved, but the proof discipline has not. Each deduction is still claim-specific: the taxpayer must confirm regime selection, eligible payment, documentary proof, applicable limit, and the correct schedule before claiming anything.
| Point | Practical meaning |
|---|---|
| 1 | Deduction labels may change, but proof discipline still matters. |
| 2 | Old-regime selection should be compared against the new regime. |
| 3 | Taxpayers should not mix ineligible deductions into a new-regime return. |
Why the timing creates a year-selection problem
AY 2026-27 return work, Tax Year 2026-27 compliance obligations, old notices, and new forms can all land in the same month. Mixing these up — using a Tax Year 2026-27 reference for something that belongs in AY 2026-27 filing — is a common source of errors. A clean file should clearly show the period, the applicable law reference, the portal form used, the payment or return type, and the supporting evidence behind each figure.
Walking through a typical scenario
A taxpayer with ELSS investments, EPF contributions, life insurance premiums, and tuition fee payments faces a straightforward deduction checklist in theory. In practice, the question is whether each of those payments was made during FY 2025-26, whether the proof is in hand, and whether a quick comparison of old-regime versus new-regime tax liability has actually been run. Skipping the comparison before finalising the return is one of the more avoidable mistakes at this stage of filing.
Documents to have ready
- 80C-style proofs: investment statements, EPF passbook, premium receipts, tuition fee receipts
- Health insurance premium receipts for any 80D-type claims
- NPS account statement and employer NPS certificate if applicable
- Regime comparison worksheet showing tax liability under both options
Pre-filing checklist
- Identify whether the deduction review affects AY 2026-27 filing, Tax Year 2026-27 compliance, or both.
- Read the official source for each deduction and confirm it maps to your income head, taxpayer type, and filing dates.
- Collect source records, computation notes, challans, statements, and declarations before filing or making any payment.
- Check whether the position affects the ITR form, schedule, tax payment, TDS/TCS, or disclosure route.
- Preserve the final return, acknowledgement, e-verification confirmation, and supporting working papers in one folder.
Official references
| Reference | Link |
|---|---|
| Income Tax Department - Income-tax Act, 2025 PDF | Open source |
| Income Tax Department - Budget 2025 income tax FAQs | Open source |
| Income Tax Department - New Act transition FAQs | Open source |
Errors to watch for
- Citing an old form number or section reference without verifying whether it still applies under the Income-tax Act, 2025.
- Mixing AY 2026-27 filing records with Tax Year 2026-27 payment or TDS records in the same computation.
- Accepting a headline slab or rebate figure without running the full computation.
- Filing or paying before reconciling AIS, Form 26AS, challans, books, and certificates.
- Not keeping a note of the official source and the computation logic behind each decision.
How MyeCA can help
MyeCA helps taxpayers and businesses organise records, compare filing routes, prepare document checklists, review tax-credit mismatches, and judge when a CA-led review makes sense before filing or responding to a notice.
Before you submit
Confirm the year. Read the official source for each deduction. Collect supporting records. Write a short computation note. Verify the return or payment route. Save the acknowledgement once submitted. That sequence, run carefully, removes most of the risk in a transition-year return.