A graduated payment mortgage loan , often referred to as GPM, is a mortgage with low initial monthly payments which gradually increase over a specified time frame. These plans are mostly geared towards young people who can not afford large payments now, but can realistically expect to raise their incomes in the future. For a medical student who is just about to finish medical school might not have the financial capability to pay for a mortgage loan , but once he graduates, it is more than likely that he will be earning a high income. It is a form of negative amortization loan.
GPMs are presently only available in the United States for mortgages insured by the Federal Housing Administration .  A monthly mortality rate for a household. For instance, a borrower may have a 30-year graduated payment mortgage with monthly payments that increase by 7% every year for five years. At the end of five years. The borrower would then pay this newly increased amount monthly for the rest of the 25-year loan term. 
The graduated payment mortgage seems to be an attractive option for first-time home buyers or those who currently have high mortgage payments. Even though the amounts of payments are drawn out and scheduled, it requires borrowers to predict their future earnings potential and how much they are able to pay in the future, which may be difficult. If borrowers overestimate their future earning potential they may not be able to keep up with the increased monthly payments.
Even if the graduated payment mortgage lets borrowers save at the present time by paying low monthly amounts, the overall expense of a graduated payment mortgage loan is higher than that of conventional mortgages, especially when negative amortization is involved.