Moving Money From a 401(k) to a SIMPLE IRA: What You Need to Know

You cannot roll a 401(k) directly into a straightforward IRA, but you can move the money through an intermediate step

A direct rollover from a 401(k) to a straightforward IRA is not permitted under IRS rules. However, you can accomplish the same goal by rolling your 401(k) into a traditional IRA first, then converting that traditional IRA into a straightforward IRA — but only if you meet specific timing requirements. The path exists, but it has strict conditions that trip up many people.

The core issue is that straightforward IRAs have their own funding rules. They are designed to receive contributions directly from employers or from rollovers that originate from other straightforward IRAs only. A 401(k) does not fit that category, so the IRS blocks a straight transfer. Understanding the workaround and its timing requirements will save you from accidentally triggering taxes and penalties.

Key Takeaways

You must first roll your 401(k) into a traditional IRA, which is a direct rollover that avoids when ready taxes.
You can then convert that traditional IRA into a straightforward IRA, but only if you have not received any other IRA distributions in the same calendar year.
The straightforward IRA must be brand new — you cannot convert into an existing straightforward IRA that has already received employer contributions.
If you fail the timing or mixing rules, you will owe income tax on the full amount plus a 10 percent early withdrawal penalty if you are under 59½.

Why straightforward IRAs have stricter rollover rules than other IRAs

A straightforward IRA is a payroll-deduction retirement plan designed for small employers. Because it is tied to an employer and funded through regular salary deferrals, the IRS treats money flowing into it differently than money flowing into a traditional IRA. The agency wants to keep straightforward IRA funds separate from other retirement savings to prevent abuse of the plan's lower contribution limits and simpler administration.

When you leave a job with a 401(k), that money can move into a traditional IRA without restriction. But a straightforward IRA is not a catch-all destination. It can only receive contributions from an employer offering the plan, or from rollovers that came from another straightforward IRA. A 401(k) does not meet either condition, which is why the direct path is closed.

The two-step process: 401(k) to traditional IRA to straightforward IRA

Step one is straightforward. Contact your 401(k) plan administrator and request a direct rollover to a traditional IRA. This means the plan sends the money directly to the new IRA custodian — it never touches your hands. A direct rollover avoids the 20 percent withholding tax that applies to indirect rollovers, and it does not count as a taxable distribution.

Step two requires timing and precision. Once the money lands in your traditional IRA, you can convert it into a straightforward IRA. But this conversion must happen within a specific window. You must wait at least two years from the date you first participated in the straightforward IRA plan at your employer before you can roll money into it. If you are setting up a straightforward IRA for the first time after leaving your 401(k) job, you can convert when ready — there is no waiting period for a brand new straightforward IRA.

The catch is the pro-rata rule. If you have any other traditional IRAs, SEP IRAs, or straightforward IRAs with balances at the end of the calendar year in which you convert, the IRS treats all of them as one pool for tax purposes. This can create unexpected tax bills. Many people discover this rule too late and end up owing taxes they did not anticipate.

The pro-rata rule and why it matters

Imagine you roll your 401(k) into a traditional IRA, creating a $100,000 balance. You then convert that entire amount into a new straightforward IRA. So far, no tax bill — you have straightforward moved pre-tax money from one pre-tax account to another. But if you also have an existing traditional IRA with $50,000 in it, the IRS looks at your total IRA balance: $150,000. It then calculates what percentage of that total is after-tax money (if any) and applies that percentage to your conversion.

In most cases, the pro-rata rule does not create a problem because most people do not have multiple IRAs. But if you do, you need to know about it before you convert. The rule applies to all IRAs you own on December 31 of the conversion year, regardless of which IRA you are converting from or into.

The one-rollover-per-year rule you must not break

The IRS allows only one rollover from any IRA to any other IRA in a 12-month period. This rule is separate from the pro-rata rule and catches many people off guard. If you roll your 401(k) into a traditional IRA, and then later that same year you roll that traditional IRA into a straightforward IRA, you have used your one rollover. You cannot do another IRA-to-IRA rollover for 12 months.

This rule does not explore to direct rollovers from employer plans like 401(k)s — only to rollovers between IRAs. So your 401(k)-to-traditional-IRA move does not count against the limit. But your traditional-IRA-to-straightforward-IRA move does. If you need to move money again within the next year, you will have to wait or use a different method.

When a straightforward IRA conversion makes sense

Most people who leave a job with a 401(k) straightforward roll it into a traditional IRA and leave it there. A straightforward IRA is rarely the better choice for someone who has just separated from employment. straightforward IRAs are designed for people who are currently self-employed or who work for a small employer offering the plan. If you are between jobs or working somewhere without a straightforward IRA, converting into one creates unnecessary complexity.

The conversion might make sense if you are self-employed and want to consolidate retirement savings into a straightforward IRA you are already using for your business income. Even then, you need to verify that your straightforward IRA custodian permits conversions from traditional IRAs — not all do. Call your custodian before you initiate the rollover from your 401(k).

What happens if you get the rules wrong

If you attempt a direct rollover from a 401(k) to a straightforward IRA and the plan rejects it, the money will be returned to your 401(k). You will not face a penalty, but you will need to choose a different destination. If you receive the money as a check instead of arranging a direct rollover, you have 60 days to deposit it into another retirement account. If you miss that important date, the full amount becomes taxable income, and you will owe a 10 percent early withdrawal penalty if you are under 59½.

If you violate the pro-rata rule or the one-rollover-per-year rule, you will owe income tax on the portion of the conversion that should not have happened. The IRS will assess this tax when you file your return for that year. If you discover the mistake after filing, you can request a correction, but the process is complicated and requires working with a tax professional.

Frequently Asked Questions

Can I roll a 401(k) into a straightforward IRA if I still work for the company?

No. You can only roll a 401(k) into another account after you leave the job or reach age 59½ (depending on the plan's rules). If you are still employed, you cannot touch the money without triggering taxes and penalties. Check your plan documents or ask your HR department about your specific options.

What if my 401(k) has company stock in it?

Company stock in a 401(k) can be rolled into a traditional IRA like any other holding. However, if you want to preserve the special tax treatment that applies to company stock (called net unrealized appreciation), you should consult a tax professional before rolling it over. The rules are complex and the tax savings can be significant.

Do I have to convert the entire 401(k) balance, or can I convert part of it?

You can convert a partial amount. Roll the full 401(k) into a traditional IRA first, then convert only the portion you want into the straightforward IRA. The remainder stays in the traditional IRA. This approach gives you flexibility if you are unsure about the straightforward IRA structure.

What if I already have a straightforward IRA from a previous job?

You can roll your 401(k) into a traditional IRA and then into your existing straightforward IRA, but only if you have not received any distributions from that straightforward IRA in the same calendar year. If you have taken distributions, you must wait until the next calendar year to convert. Contact your straightforward IRA custodian to confirm they allow conversions from traditional IRAs.

Will I owe taxes on the rollover?

A direct rollover from your 401(k) to a traditional IRA is not taxable. The conversion from the traditional IRA to the straightforward IRA is also not taxable if both accounts hold only pre-tax money. However, if you have after-tax contributions in any IRA, the pro-rata rule may create a tax bill. A tax professional can calculate your specific situation before you move the money.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.