Hi. You should probably speak with your loan servicer to get the precise details of what is required of you. It's my understanding that you are supposed to be letting them know whenever your income changes to remain in compliance with the program regs. Not sure there's any potential problem in this case, since low-income=no payments anyway.
Your PAYE payment is tied to your income and is based on the federal poverty level and the number of people you are supporting. The poverty level is currently (I think) about $11,000 a year for a single person. Anything above that amount is looked at as being available as surplus (your discretionary income).
I believe that if you file your taxes as "married filing separately", only your income would be considered in setting your repayment amount (and you'll have to recertify annually - the loan servicer should send you the forms/notices). If you file a joint return with your spouse, they will look at all that joint income as being available to you to pay back your loans and even with the additional person being supported on that money, your required payments will likely go up (if your spouse is making a decent living, that is). So you'll want to weigh the difference in the higher taxes you'd pay as married filing separately v the increase in student loan payments in the long run. (You'll probably want to verify this all.)
Hope this helps?