Section 115BBF applies to an eligible assessee: a person resident in India who is a patentee, that is, the true and first inventor whose name is entered on the patent register. Income by way of royalty on a patent developed and registered in India is taxed at ten per cent, and the rest of the total income as if it were the total income. "Developed" means at least seventy-five per cent of the expenditure on the invention incurred in India by the eligible assessee.
Royalty includes lump sum consideration for transfer of rights, imparting information, use of the patent or related services. It excludes consideration chargeable as capital gains and consideration for sale of products made with the patented process or article.
Operative consequences
No deduction for expenditure or allowance is allowed in computing the royalty (s. 115BBF(2)).
The option is exercised in the prescribed manner by the due date under s. 139(1) for the relevant previous year.
If the assessee opts in but, in any of the five succeeding assessment years, does not offer the royalty under sub-section (1), it cannot claim the section for the five assessment years after that year (s. 115BBF(4)).
Status
Section 115BBF is operative for AY 2026-27. The Finance Act, 2026 does not amend it.
The 2025 Act carries the 10% rate and the option conditions in Table Sl. No. 2 of s. 194(1), with the definitions in s. 194(2). s. 536(2)(f) treats an option in force as exercised under the corresponding provision.
The 1961 Act governs AY 2026-27 and earlier assessment years; the Income-tax Act, 2025 governs tax year 2026-27 onwards. For this subject the 2025 Act provision is s. 194(1), Table Sl. No. 2.
Case Laws & Commentary
SECTION 115BBF — TAX ON INCOME FROM PATENT
Case Laws & Commentary (Income-tax Act, 1961 as amended by Finance Act, 2026)
A. SECTION COMMENTARY
A.1 Structural position & legislative purpose
Section 115BBF is India's 'patent box' regime. It offers an eligible assessee - a person resident in India who is the true and first inventor of the invention and whose name is entered as the patentee in the register of patents - the option to be taxed at a concessional rate of ten per cent (on a gross basis) on income by way of royalty in respect of a patent developed and registered in India. Where the total income includes such royalty, the tax is the aggregate of (i) ten per cent on the royalty income (no expenditure or allowance being deductible against it) and (ii) tax on the balance income at normal rates. The option, once exercised for a previous year, binds the assessee, and if he fails to opt for any of the five succeeding years he is barred from opting again for five assessment years.
The provision implements the OECD-aligned, nexus-based intellectual-property incentive: it rewards genuine domestic research by taxing patent royalties at a low rate, conditioned on the patent being developed (at least to the prescribed extent of expenditure) and registered in India, with the eligibility certified in the prescribed Form 3CFA filed by the return due date.
A.2 Sub-section / clause taxonomy
Sub-section (1): the 10% gross-basis charge on patent royalty of an eligible assessee, plus tax on the balance income. Sub-section (2): no deduction in respect of any expenditure or allowance against the royalty income. Sub-section (3)/(4): the consequences of opting and the bar on re-opting where the assessee fails to opt in a later year. Explanation: definitions - 'eligible assessee', 'patent developed and registered in India', 'royalty in respect of a patent', 'true and first inventor', by reference to the Patents Act, 1970.
A.3 Core doctrinal themes
Theme (1) - Nexus-based concession: the 10% rate is tied to a patent developed and registered in India by a resident inventor-patentee, aligning with the nexus approach to IP incentives.
Theme (2) - Gross-basis charge with opt-in discipline: the royalty is taxed on its gross amount (no deductions), and the option, once made and then skipped, cannot be revived for five years - a discipline designed to prevent opportunistic year-by-year switching.
Theme (3) - Definitional gateway: eligibility turns on the statutory definitions (resident true-and-first-inventor patentee; patent developed and registered in India), certified through Form 3CFA.
Inserted by the Finance Act, 2016 (w.e.f. AY 2017-18) as the patent-box incentive to encourage indigenous research and the domestic retention of intellectual property. It has remained substantially stable, the eligibility and procedural conditions being prescribed by the Rules and Form 3CFA.
Finance Act 2026: no amendment to section 115BBF. The optional 10% patent-royalty regime continues for AY 2026-27 onward.
A.5 CA practitioner pointers
(1) Confirm the eligibility gateway - resident true-and-first-inventor patentee; patent developed and registered in India - before opting. (2) File Form 3CFA by the return due date for the year of opting. (3) Tax the royalty on a gross basis at 10%; do not deduct R&D or other expenditure against it (weigh this against claiming normal-rate taxation with deductions, which may be better where expenses are high). (4) Mind the opt-in discipline: skipping a year after opting bars re-opting for five assessment years.
B. FINANCE ACT, 2026 - IMPACT NOTE
Section 115BBF is NOT amended by the Finance Act, 2026. The optional 10% gross-basis regime for patent royalty of an eligible resident inventor-patentee continues for AY 2026-27 onward.
C. CASE LAW - CLUSTERED BY ISSUE
Candid note on the case-law field: Section 115BBF is a recent, narrow incentive (operative from AY 2017-18) confined to resident inventor-patentees with India-developed-and-registered patents; it has effectively no dedicated reported case-law field, and its application turns on the statutory definitions and the Form 3CFA compliance. Consistent with the accuracy discipline of this treatise, no case is cited under this section rather than attaching off-point authority; the position is stated candidly, and the eligibility analysis is anchored in the section's Explanation and the Patents Act, 1970.
D. PRACTITIONER'S NOTE
Section 115BBF is an election to be modelled, not a default: the 10% gross rate benefits a patentee with modest deductible expenses, but a research-heavy assessee may fare better under normal-rate taxation with expenditure deductions. Verify the resident-inventor-patentee and India-development-and-registration conditions, file Form 3CFA on time, and respect the five-year re-opting bar.
E. SOURCES & CITATIONS
Section 115BBF is not amended by the Finance Act, 2026.
Caveat: Treatise-style commentary for practitioners and academic use; not legal opinion. The eligibility and procedural conditions are prescribed by the Rules; verify the current statutory text, Form 3CFA requirements and the latest CBDT/appellate position before relying on any proposition.
Function in the statutory architecture
Section 115BBF applies to an eligible assessee: a person resident in India who is a patentee, that is, the true and first inventor whose name is entered on the patent register. Income by way of royalty on a patent developed and registered in India is taxed at ten per cent, and the rest of the total income as if it were the total income. "Developed" means at least seventy-five per cent of the expenditure on the invention incurred in India by the eligible assessee.
Royalty includes lump sum consideration for transfer of rights, imparting information, use of the patent or related services. It excludes consideration chargeable as capital gains and consideration for sale of products made with the patented process or article.
Operative consequences
Status
Section 115BBF is operative for AY 2026-27. The Finance Act, 2026 does not amend it.
The 2025 Act carries the 10% rate and the option conditions in Table Sl. No. 2 of s. 194(1), with the definitions in s. 194(2). s. 536(2)(f) treats an option in force as exercised under the corresponding provision.
The 1961 Act governs AY 2026-27 and earlier assessment years; the Income-tax Act, 2025 governs tax year 2026-27 onwards. For this subject the 2025 Act provision is s. 194(1), Table Sl. No. 2.
Case Laws & Commentary
SECTION 115BBF — TAX ON INCOME FROM PATENT
Case Laws & Commentary (Income-tax Act, 1961 as amended by Finance Act, 2026)
A. SECTION COMMENTARY
A.1 Structural position & legislative purpose
Section 115BBF is India's 'patent box' regime. It offers an eligible assessee - a person resident in India who is the true and first inventor of the invention and whose name is entered as the patentee in the register of patents - the option to be taxed at a concessional rate of ten per cent (on a gross basis) on income by way of royalty in respect of a patent developed and registered in India. Where the total income includes such royalty, the tax is the aggregate of (i) ten per cent on the royalty income (no expenditure or allowance being deductible against it) and (ii) tax on the balance income at normal rates. The option, once exercised for a previous year, binds the assessee, and if he fails to opt for any of the five succeeding years he is barred from opting again for five assessment years.
The provision implements the OECD-aligned, nexus-based intellectual-property incentive: it rewards genuine domestic research by taxing patent royalties at a low rate, conditioned on the patent being developed (at least to the prescribed extent of expenditure) and registered in India, with the eligibility certified in the prescribed Form 3CFA filed by the return due date.
A.2 Sub-section / clause taxonomy
Sub-section (1): the 10% gross-basis charge on patent royalty of an eligible assessee, plus tax on the balance income. Sub-section (2): no deduction in respect of any expenditure or allowance against the royalty income. Sub-section (3)/(4): the consequences of opting and the bar on re-opting where the assessee fails to opt in a later year. Explanation: definitions - 'eligible assessee', 'patent developed and registered in India', 'royalty in respect of a patent', 'true and first inventor', by reference to the Patents Act, 1970.
A.3 Core doctrinal themes
Theme (1) - Nexus-based concession: the 10% rate is tied to a patent developed and registered in India by a resident inventor-patentee, aligning with the nexus approach to IP incentives.
Theme (2) - Gross-basis charge with opt-in discipline: the royalty is taxed on its gross amount (no deductions), and the option, once made and then skipped, cannot be revived for five years - a discipline designed to prevent opportunistic year-by-year switching.
Theme (3) - Definitional gateway: eligibility turns on the statutory definitions (resident true-and-first-inventor patentee; patent developed and registered in India), certified through Form 3CFA.
A.4 Legislative evolution / Finance Act amendment trail
Inserted by the Finance Act, 2016 (w.e.f. AY 2017-18) as the patent-box incentive to encourage indigenous research and the domestic retention of intellectual property. It has remained substantially stable, the eligibility and procedural conditions being prescribed by the Rules and Form 3CFA.
Finance Act 2026: no amendment to section 115BBF. The optional 10% patent-royalty regime continues for AY 2026-27 onward.
A.5 CA practitioner pointers
(1) Confirm the eligibility gateway - resident true-and-first-inventor patentee; patent developed and registered in India - before opting. (2) File Form 3CFA by the return due date for the year of opting. (3) Tax the royalty on a gross basis at 10%; do not deduct R&D or other expenditure against it (weigh this against claiming normal-rate taxation with deductions, which may be better where expenses are high). (4) Mind the opt-in discipline: skipping a year after opting bars re-opting for five assessment years.
B. FINANCE ACT, 2026 - IMPACT NOTE
Section 115BBF is NOT amended by the Finance Act, 2026. The optional 10% gross-basis regime for patent royalty of an eligible resident inventor-patentee continues for AY 2026-27 onward.
C. CASE LAW - CLUSTERED BY ISSUE
Candid note on the case-law field: Section 115BBF is a recent, narrow incentive (operative from AY 2017-18) confined to resident inventor-patentees with India-developed-and-registered patents; it has effectively no dedicated reported case-law field, and its application turns on the statutory definitions and the Form 3CFA compliance. Consistent with the accuracy discipline of this treatise, no case is cited under this section rather than attaching off-point authority; the position is stated candidly, and the eligibility analysis is anchored in the section's Explanation and the Patents Act, 1970.
D. PRACTITIONER'S NOTE
Section 115BBF is an election to be modelled, not a default: the 10% gross rate benefits a patentee with modest deductible expenses, but a research-heavy assessee may fare better under normal-rate taxation with expenditure deductions. Verify the resident-inventor-patentee and India-development-and-registration conditions, file Form 3CFA on time, and respect the five-year re-opting bar.
E. SOURCES & CITATIONS
Section 115BBF is not amended by the Finance Act, 2026.
Caveat: Treatise-style commentary for practitioners and academic use; not legal opinion. The eligibility and procedural conditions are prescribed by the Rules; verify the current statutory text, Form 3CFA requirements and the latest CBDT/appellate position before relying on any proposition.