However, adding property taxes, if they are missing, would be able to increase itemized deductions to a maximum possible of $27,860 due to the $10,000 limitation on state and local taxes for 2018 (due to the TCJA of 2017). This means that if property taxes were $5,800 or more, taxable income would only be reduced by another $3,860, so the bulk of the difference from 2017 is still some other deduction present in 2017 that is not present in 2018.
