Tax wrongly paid for Previous Assessment year

Tax paid under the wrong AY:
• If the challan was paid after 1 April 2023 through the e-filing portal, use e-Pay Tax → Challan Correction to change the AY (within 30 days of payment for AY correction, and only if not already consumed in a return or demand).
• Otherwise, apply to the jurisdictional AO with the challan copy and a request letter for correction of AY. The AO corrects it in OLTAS.
• Meanwhile, don't claim it in the wrong AY's return.