You didn't say whether you meet all the requirements at the link that I referred you to above. A lot of information is needed to determine whether you are eligible for the property tax deduction or credit.
What is your filing status?
What is the exact amount on Form NJ-1040 line 229?
How old were you at the end of 2018?
If you are married, how old was your spouse?
Were either you or your spouse blind or disabled at the end of 2018?
Were you a homeowner or a tenant in 2018?
What is the exact amount of property tax or rent that you paid in 2018?
Did you live in the same principal residence in New Jersey all year?
Was it a single-family home? If not, describe the type of property.
Did anyone other than you and your spouse share ownership or share the rent?
