What was the amount on your 2018 1040 line 8? You might be misinterpreting the amount. Maybe you got the Standard Deduction. There are several deductions that are limited or gone now.
For 2018 the standard deduction amounts are:
Single 12,000 + 1,600 for 65 and over or blind
HOH 18,000 + 1,600 for 65 and over or blind
Joint 24,000+ 1,300 for each 65 and over or blind
Married filing Separate 12,000 + 1,300 for 65 and over or blind
There is a max 10,000 limit (5,000 MFS) of property tax and state taxes "SALT". And you can only deduct Medical that’s over 7.5% of your AGI.
