TourAxiom/Iowa/Guidance/Revenue/Individual Income Tax/Ia 1040 Schedule 1/Block 25Line 13: Net modifications to federal total incomeOfficial sourceciteSubtract line 12, column B from line 12, column A.← Line 12: Total modifications to federal total incomeLine 14: Iowa 529 or Iowa Advisor 529 College Savings Plan (Contributions) →