Section 17(1) and 17(2): Two Apportionments, Not One

Section 17 explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.

Section 17 is often described as "the ITC restriction section", which flattens three quite different provisions into one. Sub-sections (1) and (2) are apportionments; sub-section (5) is a blocking list. They operate differently and are tested differently.

s.17(1): where goods or services are used partly for business and partly for other purposes, credit is restricted to so much as is attributable to the business purpose. s.17(2): where used partly for taxable supplies including zero-rated, and partly for exempt supplies, credit is restricted to so much as is attributable to the taxable supplies including zero-rated. Two independent tests. Both are computed through Rule 42 for inputs and input services and Rule 43 for capital goods.

Section 17(1): business versus non-business

The test is purpose of use, not the nature of the goods.

Examples:

• a car used partly for the proprietor's family and partly for business — though s.17(5)(a) may block it entirely first;
• a residential portion of a mixed-use building;
• a mobile connection used for personal and business calls;
• a director's travel that combines a client meeting with a personal trip.

Rule 42 implements this in two ways: T1 removes credit exclusively for non-business purposes, and D2 deems 5% of common credit to be attributable to non-business use.

That 5% is a flat deeming. It applies whenever there is common credit, even where actual non-business use is nil — a business with no personal usage still reverses 5% of common credit. There is no mechanism to displace it with evidence.

Section 17(2): taxable versus exempt

The test is the nature of the output, not the purpose of use. A supply can be wholly for business and still fail s.17(2) if the output is exempt.

Two points that are frequently mishandled:

Zero-rated supplies are on the taxable side. Section 17(2) expressly reads "taxable supplies including zero-rated supplies". An exporter under a LUT charges no tax but is not making exempt supplies, and no reversal arises. This is what makes the export refund mechanism work at all.

Nil-rated is not the same as exempt, but both are exempt for this purpose. Section 2(47) defines exempt supply to include non-taxable supply and supplies attracting a nil rate. So alcohol, petroleum products and electricity — non-taxable supplies — are exempt turnover for the reversal. Section 17(3): what counts as exempt supply →

The two tests are cumulative

A single procurement can fail both.

A mobile phone used 20% personally by a proprietor whose business makes 30% exempt supplies goes through both filters — first the business apportionment under s.17(1) via the D2 deeming, then the exempt apportionment under s.17(2) via D1.

Rule 42 applies them in one computation, but they are conceptually separate and an officer may raise either independently.

Section 17(5) is different

Sub-section (5) opens "Notwithstanding anything contained in sub-section (1) of section 16 and sub-section (1) of section 18" and blocks credit outright on listed items — motor vehicles, food and beverages, construction of immovable property, goods lost or given away, and the rest.

The differences from (1) and (2):

• s.17(5) is absolute for the listed items. There is no apportionment; the credit is simply not available.
• It applies regardless of business purpose or taxable output. A blocked item used 100% for taxable business is still blocked.
• Blocked credit appears as T3 in Rule 42 and is removed before the apportionment begins.

Order of operations matters: strip out s.17(5) first, then apportion the remainder. Including blocked credit in the common pool and reversing only a proportion of it is a common and expensive error. Blocked ITC under section 17(5) →

Practical notes

• Tag at the invoice level, into exclusively non-business, exclusively exempt, blocked, exclusively taxable, and common. This tagging is the whole computation.
• Do not net exempt turnover against taxable. E and F in Rule 42 are gross values.
• The 5% D2 cannot be argued away. Budget for it wherever common credit exists.
• Check whether the supply is exempt or zero-rated. The two look similar on an invoice and produce opposite results.
• Run the annual recomputation under Rule 42(2) and Rule 43 before 30 November.
• Reconcile to GSTR-9 Table 7, which reports ITC reversed and ineligible ITC by category.

Key takeaways

• s.17(1) restricts credit by business purpose; s.17(2) by taxable versus exempt output.
• Both are computed through Rule 42 (inputs and input services) and Rule 43 (capital goods).
• Zero-rated supplies count as taxable — no reversal arises on exports under a LUT.
• Non-taxable supplies such as alcohol and petroleum are exempt turnover.
• s.17(5) blocks absolutely and is stripped out before apportionment.
• The 5% D2 deeming applies regardless of actual non-business use.

Read next

• Rule 42 Worked: The Monthly Formula and Annual True-Up
• Section 17(3): What Counts as Exempt Supply
• Blocked ITC Under Section 17(5)
• Rule 43: Capital Goods and the Sixty-Month Rule

Disclaimer: Positions stated as on 5 September 2026, based on ICAI Background Material on GST, Volume I (2026 edition).