Because you make contributions with pretax dollars, federal income taxes are deferred on supplemental plans until you begin taking withdrawals later on.

No taxes are due on contributions and earnings until the money is withdrawn, but because these plans are intended primarily for retirement, you can generally withdraw funds only after termination of employment or age 59½ (subject to plan rules). If you withdraw funds before age 59½, they may be subject to an additional 10% early-withdrawal penalty.

For additional information and guidance, contact your tax advisor.