Section 78: Carry Forward and Set-Off of Losses on Change in Firm Constitution or Business Succession

What does Section 78 provide?

Section 78 of the Income-tax Act, 1961 restricts the carry forward and set-off of losses in two situations: a change in the constitution of a partnership firm and succession to a business or profession by a different person. Its purpose is to prevent the unrestricted transfer or use of losses belonging to a departing partner or an earlier business owner.

The rule must be read with the loss provisions in Chapter VI of the 1961 Act, including Section 72, and the statutory treatment of changes in firms and succession. It does not itself create an independent entitlement to carry forward a loss.

Current-law context: The Income-tax Act, 2025 came into force on 1 April 2026. Section 78 below is the historical 1961 Act provision; for tax years governed by the 2025 Act, consult that Act and applicable savings or transitional provisions rather than assuming the old section numbering continues.

Section 78(1): Change in the constitution of a firm

When the constitution of a firm changes, the firm cannot carry forward and set off the portion of its loss proportionate to the share of a retired or deceased partner to the extent that it exceeds that partner's share of profits, if any, in the relevant previous year.

The provision is concerned with a partner who retires or dies; a mere change in the profit-sharing ratio, without considering the precise facts and other applicable rules, should not automatically be treated as the same event. The statutory formula must be applied to the actual losses and profit shares for the relevant year.

Key points for partnership firms

• Identify the date and nature of the reconstitution and the retiring or deceased partner.
• Establish the relevant partner's proportionate share of eligible losses and share of profits, if any, for the previous year.
• Calculate the portion disallowed by Section 78(1) before claiming any carry-forward set-off.
• Check the underlying loss's remaining carry-forward period and all other eligibility requirements.

Section 78(2): Succession to a business or profession

Where one person succeeds another in carrying on a business or profession otherwise than by inheritance, Section 78(2) generally prevents the successor from carrying forward and setting off losses incurred by the predecessor. The loss belongs to the person who incurred it.

Inheritance is expressly excepted from this particular prohibition. Whether a successor can actually use any loss in an inheritance case depends on the other applicable statutory requirements and the facts. The exception is not a blanket guarantee that every inherited loss can be used.

Special provisions governing qualifying amalgamations, demergers, reorganisations or other transactions may have their own conditions. Those rules must be separately evaluated; Section 78(2) should not be read in isolation.

Important terms and legal definitions

Constitution of a firm

The composition of the partners of a firm and their relationship in the partnership. Changes may include retirement, death or admission of partners, subject to the relevant tax provisions.

Retired partner

A partner who ceases to be a member of the continuing firm in accordance with the partnership arrangements and applicable law.

Deceased partner

A partner whose death affects the firm's composition; the legal consequences depend on the partnership deed and governing law.

Succession

A situation in which one person takes over the carrying on of a business or profession from another. The legal identity of the taxpayer and the nature of the transfer matter.

Carry forward and set-off

Carrying an eligible unadjusted loss into a later tax year and adjusting it against income permitted by the applicable loss provisions.

Inheritance

Succession resulting from inheritance, expressly distinguished in Section 78(2) from other kinds of business succession.

Practical illustrations

Example 1: Retirement of a partner

Assume a firm has an eligible brought-forward loss of Rs 12 lakh. A retiring partner's proportionate share of that loss is Rs 3 lakh, while the partner's share of profits in the relevant previous year is Rs 1 lakh. On these simplified facts, the excess of Rs 2 lakh is restricted under Section 78(1). The exact computation requires the firm's accounts, partnership terms and the applicable statutory rules.

Example 2: Sale of a sole-proprietor business

Person A sells an ongoing business to Person B. The transaction is a succession otherwise than by inheritance. Ordinarily, Person B cannot use Person A's carried-forward business losses merely because the business assets and operations were acquired.

Example 3: Inheritance

Where a business is inherited following the owner's death, the specific prohibition in Section 78(2) does not apply in the same way. The successor must still establish eligibility under the other relevant provisions and the facts of succession.

Related provisions and compliance considerations

Section 72: General rules for carrying forward and setting off business losses. Section 78: Additional restrictions when the firm's constitution changes or a business is succeeded to. Section 79: Separate restrictions for certain companies. Section 80: Filing conditions for the carry forward of specified losses. The relevant law for each assessment or tax year must be checked.

Useful supporting documents include the partnership deed and reconstitution agreement, retirement or death records, year-wise loss schedules, audited accounts, partner profit-sharing calculations, business transfer or inheritance documents and tax return acknowledgments.

Section 78: Original statutory wording and amendment history

The following is the text and legislative footnote reproduced from the original uploaded webpage. It is retained for reference; consult the official legislation for any subsequent amendments and for the tax year concerned.

Official legislation and tax resources

• Income Tax Department: official legislation and guidance
• India Code: authoritative central Acts, including income-tax and partnership legislation
• Income-tax Act, 2025: official published text
• Income Tax e-Filing Portal: returns and compliance

See also Section 75: Losses of firms, Section 79: Losses in certain companies and Section 80: Return filing for losses.