See the definitions below regarding question of "Qualified" vs "Non-Qualified" plans. However based on the ability to withdraw contributions from a ROTH IRA tax free even before the age of 59 1/2, if you have the extra money, and you are legally qualified to make the contribution, there is no downside to investing in the S&P 500 index fund in this type of account. Just keep in mind that you can only withdraw
contributions tax free before 59 1/2. If you withdrawn any funds in excess of your contributions, the withdrawals will be subject to a 10% penalty and need to be included in your current year taxable income (there are some exceptions to the 10% penalty rule which you can view if you want by simply Googling ROTH withdrawal rules). Hope this helps.
Qualified Plan
A qualified retirement plan meets certain requirements in order to receive tax benefits not available to other types of plans. These plans may be structured so that the plan is part of an employer's retirement benefits package, or they may be independent of an employer plan. The qualified plan may accept tax deductible or non-deductible contributions. If the contributions are tax deductible, then all withdrawals from the plan are taxable. If the plan contributions are non-deductible (as is the case with Roth accounts), the withdrawals are normally tax-free. Regardless, all plans allow for tax-free buildup inside the plan.
Non-Qualified Plan
Non-qualified retirement plans fail to meet IRS guidelines for qualified retirement accounts. These plans accept only non-deductible contributions. Money is taxable to the employee when it is received. All money that grows inside the plan is tax-free, however. An example of this type of plan is an annuity. Annuity contributions are always made on an after-tax basis, and gains are taxed when withdrawn from the plan.
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Qualified Vs. Non Qualified Retirement Plans | eHow