Definition: The term 'mortgage formula with an extra payment' refers to a calculation method or equation that uses additional payments on a mortgage loan, either as a partial or full payment towards the principal amount. This can be used for various purposes such as reducing monthly payments by making them more affordable and ensuring that the total cost of the mortgage remains consistent throughout the life of the loan. It is often used when a borrower wants to pay less than their entire balance at any given time, in order to make the payment more manageable. The term 'mortgage formula with an extra payment' typically consists of two or three equations that relate the principal amount of the mortgage loan, monthly payments required by the borrower, and the total cost of the mortgage. The first equation calculates how much each additional payment towards the principal amount would reduce the monthly payment by (usually based on a fixed percentage). This percentage is calculated using a formula that takes into account factors such as the length of the loan term, the interest rate, and any other terms such as early repayment penalties or penalties for partial payments. The second equation calculates how much each additional payment towards the principal amount would reduce the total cost of the mortgage by (usually based on a fixed percentage). This is done using a similar formula to determine how much money could be saved by making an extra payment. The third equation takes into account any other terms such as penalties for early repayment or payments, and calculates how much the total monthly payment would increase if there were an extra payment. The term 'mortgage formula with an extra payment' is typically used when a borrower wants to pay less than their entire balance at any given time in order to make the payment more manageable. It is also commonly used for situations where the borrower has limited financial resources and needs to save money before they can afford to make additional payments towards the mortgage. Overall, 'mortgage formula with an extra payment' is a useful tool for borrowers who want to reduce their monthly payments or increase their total cost of the mortgage without having to make more payments than needed. It is often used in conjunction with other methods such as compounding interest, amortization, and a variety of loan modification strategies.