May I make a nondeductible contribution?

Yes. Traditional IRA owners are permitted to make nondeductible IRA contributions if they are not eligible for a tax deduction or if they choose to not take a deduction. The combined total of deductible and nondeductible contributions cannot exceed the annual contribution limit of $5,500 for 2015 and for 2016, plus catch-up contributions if eligible, or 100 percent of earned income, whichever is less. IRA owners track their nondeductible IRA contributions by filing Form 8606, Nondeductible IRAs, with their federal income tax returns.