Form 13 Income Tax Rules 2026 pdf download and Key points

Last Updated on: April 21, 2026

Form 13 Income Tax Rules 2026 pdf download and Key points

FORM NO. 13
[See rule 29(2)(e)(v)]
Report from an accountant to be furnished under Section 45(2) relating to in-house scientific research and development facility

Under the Income-tax Rules, 2026, Form No. 13 replaces the erstwhile Form 3CLA. It is governed by Section 45(2) of the Income-tax Act, 2025, and Rule 29 of the Income-tax Rules, 2026.

Here are all the key points regarding Form No. 13:

1. Purpose of the Form Form 13 serves as a statutory audit report for an approved in-house scientific research and development (R&D) facility. It provides independent assurance to the tax authorities by certifying that the facility has maintained proper separate accounts and by verifying the correctness of the expenditure incurred.

2. Applicability (Who Should File & Certify)

Who Files: It must be furnished by the company that is claiming a tax deduction for its in-house R&D expenditure under Section 45(2).
Who Certifies: The report must be strictly audited and certified by an independent Accountant, as defined in Section 515(3)(b) of the Income-tax Act, 2025 (such as a chartered accountant holding a valid certificate of practice).

3. Frequency and Filing Mechanism

Frequency: It is an annual requirement and must be furnished for each tax year in which the deduction under Section 45(2) is claimed.
Where to File: It is furnished electronically with digital authentication to the Income-tax Department and must be attached with or submitted in support of the company’s annual return of income.

4. Scope of the Audit and Information Reported The accountant certifying Form 13 must verify and report several critical parameters, including:

The approval details of the in-house R&D facility (approved by the DSIR).
A confirmation of whether separate accounts have been maintained for the approved facility, and the auditor’s opinion on whether these accounts are maintained satisfactorily.
A certification confirming that the expenditure incurred is in strict consonance with the guidelines issued by the Department of Scientific and Industrial Research (DSIR).
An audited break-up of both the capital and revenue expenditure incurred on the facility.
A cross-reference linking the reported R&D expenditure with the company’s overall audited financial statements.

5. Role in the Compliance Lifecycle Form 13 is a critical piece of a system-driven compliance architecture for R&D tax incentives. It completes the independent audit layer, functioning alongside:

Form 11 (the company’s application and agreement).
Form 14 (the approval of the facility by DSIR).
Form 12 (the evaluation report submitted by the prescribed authority).

6. Legal Implications and Adverse Remarks

Mandatory but not a Guarantee: Furnishing Form 13 is a mandatory statutory pre-condition to claim the deduction, but possessing it does not automatically guarantee the allowance of the deduction; it remains subject to Departmental verification.
Consequences of Adverse Remarks: If the accountant notes any adverse remarks in Form 13—such as improper maintenance of accounts or non-compliance with DSIR guidelines—it may lead to further scrutiny by the tax authorities and could result in the denial or restriction of the company’s tax deduction.

Form 13 Income Tax Rules 2026 pdf download and Key points

Form 13 Income Tax Rules 2026 pdf download and Key points

Form 13 Income Tax Rules 2026 pdf download

Form No.13– Frequently Asked Questions

Guidance Note on Form 13