A builder constructed a 120-flat residential apartment complex and received the Occupation Certificate (OC) on 10.10.2018. While 80 flats were registered after the OC, 40 were registered before it. The tax department is suggesting that the builder must restrict Input Tax Credit (ITC) to 33% of the total ITC, disallowing the rest, based on the proportion of flats registered prior to the OC. The builder is seeking professional guidance on this matter.