Prospective application

Section 50AA changed how a class of debt-heavy mutual funds is taxed, taxing all gains as short-term, whatever the holding period. But the change was not made to apply to every unit ever bought — only to units acquired from a fixed date onward.

The workbook states the rule directly: "Section 50AA applies prospectively to such SMFs acquired on or after 01-04-2023." Units bought on or before 31 March 2023 are taxed under the ordinary rules that applied before the section existed, and Section 50AA will not apply to them at all.

Prospective application means the rule looks forward only from its start date — it does not reach back and re-tax units already held before that date.

But the workbook flags an important contrast in the very next section, for Market Linked Debentures: MLDs "transferred, redeemed or matured on or after 01-04-2023 shall be subject to taxation under Section 50AA, even if such MLDs were issued or acquired before that date." For MLDs, the trigger is the date of the transaction (transfer, redemption or maturity), not the date of acquisition — so an MLD bought in 2021 but sold in 2024 is still caught.

So the same Section 50AA is genuinely prospective by acquisition date for Specified Mutual Funds, but prospective by transaction date for MLDs — two different anchor dates within the same section, and the workbook states both.

Illustrative figures. Mr Ranganathan bought units of a Specified Mutual Fund on 15 March 2023 for Rs 5,00,000, and separately bought an MLD on the same date for the same amount. He sells both on 1 May 2024, each for Rs 6,50,000.

SMF units:  acquired before 01-04-2023 -> Section 50AA does NOT apply
            taxed under the ordinary rules in force for that fund type

MLD:        transferred after 01-04-2023 -> Section 50AA DOES apply
            entire Rs 1,50,000 gain taxed as short-term, regardless of the pre-2023 purchase date

Two assets bought on the identical date, sold on the identical date, taxed under two different regimes — because the SMF rule looks at the acquisition date and the MLD rule looks at the transaction date.

Chapter 10 (Taxation of Debt Products), section 10.3.4, states the prospective application of Section 50AA for Specified Mutual Funds, and section 10.5.1 states the contrasting transaction-date trigger for MLDs. Expect a question that tests which date — acquisition or transaction — governs whether Section 50AA applies to a given instrument.

• "Prospective" does not mean the same thing for SMFs and MLDs in this chapter. SMFs look at the acquisition date; MLDs look at the transfer, redemption or maturity date. Read which instrument the question names before applying either test.
• An MLD bought before 1 April 2023 is not grandfathered the way an SMF bought before that date is — this is the trap the workbook explicitly calls out.
• The cut-off is 1 April 2023 for both, but the thing being dated differs — do not assume a single uniform rule across the two instrument types.