My understanding is $10,000 is maximum number I put on New York 529 contribution but when I enter $20, 000 the program actually took it and my NY state refund jumped up. I compare the NY state refund between $10K VS. $20K and the $20K contribution NY state refund are significantly higher. Is this program bug that it should be same amount of refund between $10K VS. $20K New York 529 contribution since $10K is the maximum contribution for married joint filing or I am missing something?