TDS on property purchase section 194IA

TDS on sale of property,  Section 194IA

Agreement value 80 lac, agreement date – 01.04.2023

First Instalment Payment of Rs.  10 lac is to be made to builder in oct 2023

Is it mandatory to deduct TDS @ 1%  u/s 194IA , or can I deduct later on when payment

Exceeds 50 lac.

In one case buyer paid various instalment to builder starting from 1.4.2019 and up to 15.10.2023 total 45 lac paid to builder without deducting TDS.  If we deduct TDS now  and  then there will be late fee and interest. Please suggest