Rental application - do you accept joint tax return?

[James Brown]

Hi everyone, I wanted to pick your brain on a question I run into lately. 

I recently listed an apartment for rent. One of the applicants applied for our apartment as a single applicant, but submitted a joint tax return (with his spouse) as proof of income. He also sent me a bank statement, which is in his name. Numbers all look great in the tax return and the bank statement, but I couldn't tell how much of that income is his. Everything else in his application looks great - very good credit score, good job, etc.

What would you do in this case? Would you ask for more proof of income, like pay stubs or job offer that's from/for him only? Would you ask for a co-signer (his spouse in this case) in the lease?

Thank you all very much in advance.