For the receiving party
Spousal support may be considered as qualifying income in some circumstances. What generally receives attention is whether the agreement clearly establishes the payment, whether receipt can be documented, and how long the payments are scheduled to continue relative to the loan being considered.
For the paying party
The obligation typically reduces the income available for a new housing payment. Understanding that impact before agreeing to an amount can prevent a difficult realization later, particularly when the paying party also needs to secure housing.