Until the total of all of your SCH A itemized deductions exceeds your standard deduction, those itemized deductions have no impact on your tax liability.

Standard Deduction
Single - $12,000
Married Filing Separate - $12,000
Head of Household - $18,000
Married Filing Joint - $24,000

Additionally, itemized deductions for SALT (State And Local Taxes) is limited to a maximum of $10K ($5K if married filing seperate.)