Here are my interpretations of the Exemption u/s 54F
1. Asset Sold - Any Capital Asset not being a residential house
2. Benefit to - Individual, HUF
3. Asset is to be Long Term Capital Asset
4. Reinvest the Sale Consideration - In Residential House, within 1 year before, or 2 years after the date of transfer (if purchased), or 3 years after the date of transfer (if constructed).
5. Amount of Reinvestment - If the cost of the specified asset is not less than Net Consideration of the original asset, the whole of the gains. If the cost of the specified asset is less than the Net Consideration, the proportionate amount of the gains.
6. The assessee must not own more than one residential house other than the new house on the date of the transfer of the original asset.
7. The assessee must neither purchase within two years after or construct within three years after the day of transfer, any other residential house other than the one in which reinvestment is made nor transfer the new asset within 3 years from the date of its acquisition/construction, otherwise the amount of gains earlier exempted shall be deemed to be LTCG in the year of such transfer.
Interpretation
Hence Mr X had one Residential House at time of sale of asset. He can now buy one more residential house to get exemption u/s 54F.
If Mr X after purchase of the second house sells that house within 3 years OR purchases new house in 2 years OR Constructs new house in 3 years THEN the capital gain so saved will be taxed in that year.