Introduced in 1998, these are individual retirement accounts funded with nondeductible contributions. Withdrawals after an account holder had reached the age of 59 1/2 are tax-free. The maximum contribution for 2005-2006 is $4,000. Only singles with adjusted gross income of less than $95,000 may make a full contribution (partial contributions may be made up to income of $110,000). Likewise, only couples with income of less than $150,000 may make a full contribution, with partial contributions allowed up to $160,000.