Teachers and hospitals may get a chance to put post-tax income into employer-sponsored retirement plans, then withdraw cash tax-free later.

The MetLife Resources unit of MetLife Inc., New York, will be offering the new Roth account option through 403(b) tax-deferred savings plans, the company says.

An employer must approve the option before MetLife will add it to the plan, and then employees who want to use the option must irrevocably designate contributions to be made to the Roth account, the company says.