There is also a three-digit code number assigned to each currency, in the same manner as there is also a three-digit code number assigned to each country as part of ISO 3166. This numeric code is usually the same as the ISO 3166-1 numeric code.
This calculator uses these guidelines for determining how much house you can afford, which are similar to common underwriting criteria that mortgage lenders use. 1  Your total mortgage payment should be no more than 28 percent of your gross monthly income.
Mortgage Underwriters. The most common type of underwriter is a mortgage loan underwriter. Mortgage loans are approved based on a combination of an applicant's income, credit history, debt ratios and overall savings. Mortgage loan underwriters ensure that a loan applicant meets all of these requirements, and they subsequently approve or deny a loan.