A qualified retirement plan is an investment plan offered by an employer that qualifies for tax breaks under Internal Revenue Service (IRS) guidelines. An individual retirement account (IRA) is not offered (with the exception of SEP IRAs and SIMPLE IRAs) by an employer. Therefore it is not a qualified plan.

In most cases an IRA is not a qualified retirement plan.

Traditional IRAs

Traditional IRAs are savings plans that allow you the benefit of tax-advantaged growth. As contributions to them are made with money that has not yet been taxed, investors generally get a tax write-off, although that write-off can be limited or not permitted, depending on your income and whether you have a qualified retirement plan at work.

However, tax must be paid on distributions, which you are required to start taking at age 70½, even if you haven't retired yet. These are called required minimum distributions (RMDs); the amount is determined by an IRS formula involving your age and your account balance. Generally, the latest you may start taking them is by April 1 of the year following the year in which you turn 70½.

If you withdraw any funds before you turn 59½, you will be subject to a 10% early withdrawal penalty in addition to the usual requirement of paying income tax on the amount you take.

There are also limits to how much you can contribute to an IRA each year. In 2019 you are limited to a total of $6,000 for the year ($7,000 if you are are 50 or older) for all the IRAs you may have.

IRA plan providers allow holders to designate beneficiaries, and some plan holders allow beneficiaries for multiple generations. Because traditional IRAs allow individuals to invest on a tax-deferred basis, they are suitable for people who are in a high tax bracket, but anticipate being in a lower one at retirement.

Roth IRAs

Roth IRAs require that investors pay tax on contributions; in other words, you contribute with after-tax funds and do not get a tax write-off. The advantage comes when you retire: No tax is assessed on distributions, which means that you are not taxed on any of the money that your income earns over the years it sits in your Roth account. What's more, if you need to take money out of the account, you are not taxed if you take out just the contributions you originally made.

Roth IRAs have no RMDs, no requirement that you start taking distributions. Another benefit of no RMDs: If you can afford to hold the funds, they can continue to grow tax-free and be passed to your heirs. The heirs will be required to take distributions, however.

Unlike traditional IRAs, you may continue to make contributions to Roth IRAs after age 70½.

As Roth IRAs allow individuals to invest on a tax-free basis, they are suitable for individuals who are in a low tax bracket but anticipate being in a higher one at retirement. In fact, there are income limitations on who is permitted to contribute to a Roth IRA. Those with higher incomes can only open one by rolling over traditional IRA or 401(k) money and paying substantial taxes, a process called opening a backdoor Roth IRA. One exception: If they have a Roth 401(k), they can roll it over into a Roth IRA without the tax requirement.

Qualified Retirement Plans

Some employers offer defined-contribution or defined-benefit qualified retirement plans. Employers receive incentives from the U.S. government to create these plans.

Defined-contribution plans, such as 401(k)s, have largely replaced defined-benefit plans (the old-fashioned pension)  as the preferred model. With many employers, employees may elect to take part in retirement savings plans, such as 401(k) plans, in which employers match contributions and savings grow on a tax-advantaged basis.