schedule 2 has nothing to do with itemized deductions. line 1 of schedule 2 is for Alternative Minimum Tax (AMT). you are not subject to it if line 1 is blank. this tax is computed on form 6251 with the tax from line 11 of the form
line 8 is for taxes from form:
8959 additional medicare tax
8960 additional investment income tax
8889 additional tax od HSA's
8853 additional tax on Archer MSA
and a slew of other taxes.
we can't see your return or schedule A, but to itemize in 2020 your allowable itemized deductions had to exceed filing single $12,400 or if over $65 $13,700.
medical expenses are limited to the amount in excess of 7.5% of your AGI
taxes are limited to $10,000
contributions can be limited based on AGI and the type of charity
mortgage interest can be limited if the acquisition debt exceeded the applicable threshold.
2% itemized deductions are eliminated
theft and casualty losses may or may not be deductible
gambling losses are limited to gambling winnings.
