As regards PenFed specifically: If you want two incomes considered you will have to apply in joint. If you want to apply in joint call them before you join. If you apply as an individual only your income will be considered. They are not interested in HHI. They also have a history of asking many applicants for proof of income. This is a great issuer and very generous with their credit lines if you make it over the bar to approval. PenFed is a quasi-military CU. Best to play it straight down the middle of the fairway with these folks.