Only a surviving spouse who rolls over an inherited Roth IRA can treat the account as his/her own and make contributions to it. A non-spouse beneficiary who wants to contribute to a Roth IRA must set up a separate account.
A portion of earnings withheld by an employer or put into a retirement plan for distribution to the employee at a later date. If certain legal requirements are met, the deferred amount is not taxable until actually paid, for example, after retirement.