Interest only
Don't you mean endowment mortgage?
For many people, interest only mortgages are called 'endowment mortgages' or even 'pension mortgages', but strictly speaking these names describe an interest only mortgage plus the method by which it is repaid. In other words, an endowment mortgage is an interest only loan that is repaid by the proceeds of an endowment policy etc.
How they Work
An interest only mortgage is where the lender (a bank or building society usually) only charges you interest on the loan you've agreed. You don't pay the capital back until the end of the mortgage. The lender will usually ask you at the outset to provide an investment plan of one type or another to repay the loan at the end of the term, such as an endowment policy or ISA savings plan, but sometimes they will leave the repayment plan entirely up to you.
Every month, you then pay this interest to the lender for the duration of the loan. The lender calculates your monthly repayments depending upon how the rate you have chosen is set. At the end of the loan period, the lender will expect the initial capital they lend you to be repaid in full by whatever means you have arranged.
It is important to note that if you arrange to repay your mortgage using an investment vehicle, then dependent on its performance it is possible you may have insufficient funds to repay the liability at the end of the term. Also, because no capital is repaid throughout the term of the loan, the interest payments are based on the full borrowing for the full term of the loan.
For mortgage advice you can choose how we are paid: pay a fee which is usually 0.5% of the loan amount and we will refund any commission paid to us by the lender, or we can accept commission from the lender and no fee will be charged.
Your home may be repossessed if you do not keep up repayments on your mortgage.