1. Yes, tax audit would generally be mandatory, assuming this is governed by the Income-tax Act, 1961.
Analysis
The partnership firm:
- is an eligible assessee for section 44AD;
- has opted for section 44AD for the first 3 assessment years;
- wishes to opt out from the 4th year;
- has turnover of Rs. 54 lakh (below the threshold for section 44AD).
Under section 44AD(4), if an eligible assessee declares profits as per section 44AD for any assessment year and subsequently declares profits not in accordance with section 44AD for any of the next five assessment years, the assessee becomes ineligible to claim the benefit of section 44AD for those five years.
Further, section 44AD(5) provides that where section 44AD(4) applies, the assessee must:
- maintain books of account as prescribed under section 44AA; and
- get the accounts audited and furnish the audit report as required under section 44AB,
if the total income exceeds the maximum amount not chargeable to tax.
Impact for a Partnership Firm
For a partnership firm, there is no basic exemption limit; tax is payable from the first rupee of taxable income. Therefore, the "maximum amount not chargeable to tax" is effectively Nil. Consequently, if the firm has any taxable income, the condition under section 44AD(5) is satisfied.
Conclusion
Accordingly, if the firm opts out of section 44AD in the 4th year:
- it must maintain regular books of account; and
- tax audit under section 44AB becomes mandatory, notwithstanding that the turnover is only Rs. 54 lakh.
The turnover threshold under section 44AB does not override the specific requirement arising from sections 44AD(4) and 44AD(5).
Note: If your query is under the Income-tax Act, 2025, the conclusion may differ because the presumptive taxation provisions have been renumbered and modified. Please specify the relevant Assessment Year if you are referring to the new Act.