While there are tax benefits to purchasing a property through a buy-to-let, there are some downsides. If ownership of an existing property is transferred to a company, then it will be subjected to capital gains tax and Stamp Duty (the amount payable will depend on the value of the property). Your dividend profits will also be subject to tax. There are also fewer lenders that offer this type of mortgage, compared to standard buy-to-let mortgages, so you will have less choice of deals and interest rates may be higher.