IF OR/AND FORMULA

I'm trying to write a formula that does this in english:

If the Due Date is greater than the Quarter Helper Column OR if the Due Date is blank & today is within 15 days of the Quarter Helper Column, then flag Red, otherwise no flag.

I'm getting an invalid operation message with this formula: =IF(OR([Due Date]6 > [Quarter Helper Column]@row, AND([Due Date]6 = "", (TODAY(15) > [Quarter Helper Column]@row))), 1, 0)

Answers