Alice owns a buy-to-let dwelling which she rents out. She decides to purchase a dwelling to use as her main residence, but does not sell the existing buy-to-let dwelling. At the end of the day that is the effective date of the transaction, she owns two dwellings and has not replaced her main residence, so she must pay the ADS.
Five months later, Alice sells her buy-to-let dwelling and attempts to claim repayment of the ADS paid. As this buy-to-let dwelling was not her main residence, she has not replaced her main residence. Therefore, she will not be entitled to claim for a repayment of the ADS paid.