Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to underwrite loans [title] Calculate the borrower's mandatory monthly costs. [step] Payments such as those equal to the proposed mortgage payments, taxes, and insurance comprise mandatory monthly costs. These are costs that are necessary and cannot be compromised or adjusted with ease.

Ending1: In many cases, gross deductible income is utilized as a rule of thumb. If your monthly expenses are truly excessive, then you will need to finalize an additional loan to satisfy these costs. Ending2: [title] Determine the amount of debt the borrower must pay off each month. [step] Debts from other loans, such as student loans for example, and revolving debts (credit cards) must be taken into consideration. Ending3: [substeps] Check with your lender to see how much of these additional expenses can be offset by your borrower's annual payments. That way, you don't make any accidental errors when you underwrite the loan. Ending4: Regardless of the amount that you underwrite, factor those costs into your statement. It may be difficult, but you must set aside a certain amount of time and devote that period of time to underwriting.

Answer format: ending1/ending2/ending3/ending4