Income Tax Form 18: Notification of Affordable Housing Projects as Specified Business Under Section 46

Overview and Legislative Background

The Income Tax Act, 2025 introduces a structured framework for granting tax incentives to affordable housing initiatives through Section 46. At the heart of this framework lies Form 18 — a prescribed application through which an assessee seeks formal notification of an affordable housing project as a specified business, thereby becoming eligible to claim tax benefits on qualifying expenditure. Understanding this form thoroughly is critical for developers, builders, and entities engaged in or planning to undertake affordable housing ventures.

Before diving into the details of Form 18, it is helpful to understand how this form connects to earlier legal provisions:

This cross-reference table clarifies that Form 18 under the Income-tax Rules, 2026 is the updated equivalent of the older Form 3CN, with Section 46 of the Income-tax Act, 2025 replacing the erstwhile Section 35AD of the Income-tax Act, 1961. Similarly, Rule 36 of the Income-tax Rules, 2026 now governs what was previously covered under Rule 11-OA of the Income-tax Rules, 1962.

What is Form 18?

Form 18 is the officially prescribed application form through which an assessee applies to the Income Tax Department for notification of an affordable housing project as a specified business under Section 46 of the Income-tax Act, 2025. This notification is not merely procedural — it is the gateway to claiming statutory tax benefits on all eligible expenditure incurred in connection with the said project.

In essence, without this notification, an assessee cannot avail the fiscal incentives that Section 46 offers, regardless of whether the project otherwise meets all qualifying criteria. The form captures a comprehensive picture of the assessee, the nature of the business, and the characteristics of the proposed project, allowing the authorities to verify compliance before granting the formal notification.

Who Must File Form 18?

Form 18 is required to be filed by any assessee who:

• Is presently carrying on an affordable housing project, or
• Proposes to carry on such a project in the future

and seeks its notification as a specified business under Section 46.

Important: Filing of Form 18 is mandatory for claiming benefits under Section 46 of the Income-tax Act, 2025. An assessee who fails to obtain notification through this form will be ineligible to claim the associated tax deductions, even if the project is otherwise compliant with all prescribed conditions.

This requirement applies equally to projects that are already operational and those that are still in the planning or development phase, making early filing advisable for entities intending to claim benefits from the earliest possible tax year.

Structure of Form 18: Key Components

Form 18 is divided into six main parts, each capturing a distinct category of information:

1. Particulars of the Assessee

This section collects fundamental identification and contact details, including:

• Name and address of the assessee
• Permanent Account Number (PAN)
• Status (individual, company, firm, etc.) and residential status
• Email address and contact number

Certain fields in this section may be pre-filled by the Income Tax Department based on existing records. However, the assessee remains fully responsible for verifying and confirming the accuracy of all such pre-filled information before submission.

2. Particulars of the Specified Business

This section requires details relating to the business entity and project identity, such as: