If your adjusted gross income is more than $166,800 or $83,400 if you are married filing separately, your deductions are limited. Some deductions are exempt from this.
Lower limits: Single is 5700, Head of Household is 8350, Married Joint is 11,400. High limits If you income exceeds AMT levels, itemized deductions are reduced by a sliding percentage.
Itemized deductions are sometimes emited to acertain threshld amound. And your overall total itemized deductions may be limited. Here re the limitations you need to be aware of.