Can I itemize on my Connecticut return if I claimed the standard deduction on my federal return? No. CT instructions indicate the state taxable income is pulled from the federal return where your deductions have already been considered. Related articles What type of income needs to be added to my Connecticut return? What is my residency status for Connecticut? What type of income can be deducted from my Connecticut return? Is my retirement income taxable to Connecticut? Can I itemize on my DC return if I claimed the standard deduction on the federal return?