As from the 6th April 2020, there are major changes in the way that Capital Gains on residential let of 2nd properties are returned to the Inland Revenue.
At present, if you sell a property that has been let the Capital Gain goes on your Tax Return for the year in which the sale occurs and the tax is paid by the 31st January following that tax year.
For example: property sold 31/10/19, the gain is shown on the 2019/2020 Tax Return and paid by 31/01/21.
After the 6th April 2020, a provisional Capital Gain calculation will need to be submitted to H. M. Revenue & Customs within 30 days of the completion of the sale of an applicable residential property and the tax due will also need to be paid within that 30-day period.