A buy to let mortgage calculator can be used to work out the anticipated mortgage repayments that you may need to pay back over the term of the commercial buy to let mortgages that you are investing in.  The calculator will take into account the cumulative amount of interest that you are repaying, and whether you are choosing a buy to let mortgage interest only, or buy to let mortgages that you also repay the principle capital borrowed throughout the term of the mortgage loan.

The difference between these, means that the calculator should clear the buy to let mortgage if you are repaying the mortgage and the interest over the term, whereas if you are choosing a buy to let mortgage which is interest only, then you will still owe the who mortgage amount at the end of the term, as you will only have repaid the interest on the buy to let.

This has a huge impact on 2 areas, one is that the property is not yours at the end of the buy to let mortgage and you still have to find the capital to repay the money you initially borrowed.  Some people who assume that a property investment will increase in value, will simply sell the building at the end of the term and keep the balance themselves.

Secondly the amount you repay will vary significantly depending on which type of mortgage you choose.  The interest only buy to let mortgages will not usually require as much monthly mortgage repayment as the commercial mortgage would that clears the debt and the interest.

Using a buy to let mortgage calculator will show you the differences and the impact that you could potentially face.