Enter a description of the adjustments based on what it is. Review your federal return to determine what caused your adjustments. Examples of adjustments include half of the self-employment taxes you pay; self-employed health insurance premiums; contributions to certain retirement accounts (such as a traditional IRA); student loan interest paid; educator expenses, etc
From the instructions:
Line 18: Total federal adjustments to income
Federal amount column
Enter the total adjustments to income you reported on your federal return. Write each adjustment and its amount in the Identify area on line 18. If you need more room, submit a list on a separate sheet of paper showing each adjustment and its amount.
If you did not have to file a federal return, claim the same adjustments to income that you would have claimed for federal income tax purposes.
New York State amount column
Enter that part of the federal amount that represents adjustments related to income you received as a nonresident that was derived from or connected with New York State sources.
Part-year residents
Also add that part of the federal adjustment deductible while you were a New York State resident.
Allocate to New York State any other adjustment to income that relates to wage or salary income earned partly in New York State, or to income from a business carried on both in and out of New York State, on the same basis as the income to which it relates. Some of these adjustments include IRA deduction, one-half of self-employment tax, and self-employed SEP, SIMPLE, and qualified plans.
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