
You can have both a Simple IRA and a 401(k) plan, but there are some key differences to consider. The main difference is that a Simple IRA is designed for small businesses and self-employed individuals, while a 401(k) plan is typically offered by larger employers.
Contributions to a Simple IRA are made by the employer, while a 401(k) plan allows employees to make their own contributions. The contribution limits for a Simple IRA are higher than those for a 401(k) plan.
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What Is a Simple IRA and a 401(k)?
A Simple IRA is a type of retirement savings plan available to small businesses and self-employed individuals. It has eligibility requirements, such as having fewer than 100 employees.
The main difference between a Simple IRA and a 401(k) is the contribution limits. A Simple IRA has a higher contribution limit, up to $13,000 in 2022, compared to the 401(k) limit of $19,500.
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What Is an Simple IRA?
A Simple IRA is a type of retirement savings plan that's designed for small businesses with 100 or fewer employees. It's a great option for companies that can't afford a traditional 401(k) plan.
Contributions to a Simple IRA are made on a pre-tax basis, which means you won't pay income taxes on the money until you withdraw it in retirement.
You can contribute up to $13,500 to a Simple IRA in 2022, or $16,500 if you're 50 or older.
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What Is a 401(k)?
A 401(k) is a type of employer-sponsored retirement plan that allows employees to contribute a portion of their salary to a savings account on a tax-deferred basis.
These plans are named after the relevant section of the Internal Revenue Code, which governs their operation.
401(k) plans are designed to help employees save for retirement by allowing them to contribute a portion of their income on a pre-tax basis, reducing their taxable income for the year.
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Contributions to a 401(k) plan are made with pre-tax dollars, which means they reduce an employee's taxable income for the year, resulting in lower taxes owed.
Employers often match a portion of an employee's contributions to a 401(k) plan, which can significantly boost an employee's retirement savings.
Employees can typically choose from a range of investment options, such as stocks, bonds, and mutual funds, to grow their retirement savings over time.
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Setting Up a Plan
To set up a SIMPLE IRA plan, you need to follow three basic steps. First, you must adopt a SIMPLE IRA plan document by signing one of the required documents, such as Form 5304-SIMPLE or 5305-SIMPLE.
You'll also need to provide each eligible employee with certain information about the SIMPLE IRA plan and where you'll deposit employee contributions, prior to the employee election period, which is generally 60 days prior to January 1.
To set up a SIMPLE IRA for each eligible employee, you can use either IRS model. You may only maintain a SIMPLE IRA plan on a calendar-year basis, so be sure to plan accordingly.
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Here are the three steps to set up a SIMPLE IRA plan in more detail:
- Adopt a SIMPLE IRA plan document by signing one of these documents: Form 5304-SIMPLE or 5305-SI
Provide each eligible employee with certain information about the SIMPLE IRA plan and SIMPLE IRA where you'll deposit employee contributions prior to the employee election period (generally, 60 days prior to January 1).
Set up a SIMPLE IRA for each eligible employee using either IRS model.
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Pros and Cons
Having a SIMPLE IRA and a 401k can be a great combination for your retirement savings.
A SIMPLE IRA is easy to establish and maintain, with no filing requirements and no discrimination testing required. This makes it a low-maintenance option for small businesses or self-employed individuals.
Here are some of the key benefits of a SIMPLE IRA:
- Easy to establish.
- Easy and inexpensive to maintain: no filing requirements.
- There is no discrimination testing required.
- Roth option available (if your provider supports it).
- Employer can add an optional extra nonelective contribution.
Pros
Establishing a SIMPLE IRA is a breeze, and it's a great option for small businesses or solo entrepreneurs. It's easy to set up, which is a big plus.
One of the best things about a SIMPLE IRA is that it's easy and inexpensive to maintain. There are no filing requirements, which means you won't have to worry about a lot of paperwork.
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You also won't have to deal with discrimination testing, which can be a hassle. This means you can focus on running your business instead of navigating complex regulations.
If your provider offers it, you can even opt for a Roth contribution, which allows you to contribute after-tax dollars and potentially reduce your tax liability in retirement.
Cons
If you're considering a SIMPLE IRA for your small business, there are some downsides to be aware of.
Employer contributions are mandatory, which can be a significant financial burden.
Lower employee contribution limits than a 401(k) mean your employees may not be able to save as much for retirement.
Historically, SIMPLE IRAs have been considered "exclusive" plans, but it's now possible to switch to a safe harbor 401(k) plan mid-year with proper notice.
Withdrawals or rollovers to non-SIMPLE plans within the first 2 years face a 25% penalty, with limited exceptions.
No loan feature is available with a SIMPLE IRA, which may be a drawback for employees who need access to their retirement funds in an emergency.

Here are some key cons of SIMPLE IRAs at a glance:
- Employer contributions are mandatory.
- Lower employee contribution limits than a 401(k).
- Historically “exclusive” plan — but now you can switch mid-year to a safe harbor 401(k) with proper notice.
- Withdrawals or rollovers to non-SIMPLE plans within the first 2 years face a 25% penalty (with limited exceptions).
- No loan feature.
Comparison and Choice
If you're considering setting up a retirement plan for your small business, you have two main options: a SIMPLE IRA and a 401(k) plan.
A SIMPLE IRA is a great choice for small businesses with fewer than 100 employees, as it's less expensive to administer and has lower contribution limits.
The main difference between a SIMPLE IRA and a 401(k) plan is the level of contribution limits and employer matching options.
Here are some key differences between the two plans:
Consider the size and growth of your business when choosing between a SIMPLE IRA and a 401(k) plan. If you expect to grow quickly, a 401(k) plan might be a better choice due to its more flexible features and higher contribution limits.
Employers must contribute 2% non-elective or 3% matching contribution to each eligible employee's account in a SIMPLE IRA, while there is no mandatory employer contribution in a 401(k) plan.
In a SIMPLE IRA, all contributions are immediately 100% vested, whereas companies can set up a vesting schedule for employer contributions in a 401(k) plan.
Ultimately, the choice between a SIMPLE IRA and a 401(k) plan depends on your business's specific needs and goals.
Contributions and Limits
Contributions to a SIMPLE IRA and a 401(k) can be made in a similar way, but with some key differences. In a SIMPLE IRA, employees can defer up to $13,500 in 2020 and 2021, with an additional $3,000 catch-up contribution allowed for those 50 or over.
The contribution limits for a 401(k) plan are higher, with a limit of $23,500 in 2020 and 2021, plus a $7,500 catch-up contribution for those 50 or over. Employers can also contribute to a 401(k) plan, but are required to make a 3% match or 2% nonelective contribution to a SIMPLE IRA.
Here's a comparison of the contribution limits for both plans:
Contribution to Retirement Plan
You can contribute to a SIMPLE IRA plan if you meet certain requirements. You can't contribute to a SIMPLE IRA plan for a calendar year if you maintain another retirement plan and any of your employees receives an allocation or accrues a benefit under the other plan during that calendar year.
However, there are some exceptions to this rule. If the other plan is only for employees covered under a collective bargaining agreement, and the SIMPLE IRA plan excludes these employees, you can have a SIMPLE IRA plan even if you maintain another retirement plan.
Another exception is if your business was part of an acquisition, disposition or similar transaction during the current calendar year or the 2 prior calendar years, and only your separate employees participate in the SIMPLE IRA plan.
You can also set up a SIMPLE IRA plan for this year if you meet the other SIMPLE IRA plan requirements and your employees don't receive any allocations or accrue benefits from another plan for this year.
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Here are the types of contributions that may be made to a SIMPLE IRA plan:
- Salary reduction contributions
- Employer matching contributions (either a matching contribution or a nonelective contribution)
The employer must make either a matching contribution or a nonelective contribution to the SIMPLE IRA plan. Contributions under a SIMPLE IRA plan may only be made to a SIMPLE IRA, not to any other type of IRA.
The amount of the employer contribution depends on the type of contribution. If the employer chooses to match each employee's salary reduction contribution on a dollar-for-dollar basis, the employer must match up to 3% of the employee's compensation. If the employer chooses to make a nonelective contribution, the employer must make a contribution of 2% of the employee's compensation up to the annual limit of $290,000 for 2021 ($285,000 for 2020).
Here are the contribution limits for a SIMPLE IRA plan:
- $13,500 in 2020 and 2021 ($13,000 in 2018; $12,500 in 2016 – 2018, subject to cost-of-living adjustments for later years)
- Catch-up contribution of up to $3,000 in 2016 – 2021 (subject to cost-of-living adjustments for later years) for employees age 50 or over
Contribute Same Year?
It is generally uncommon to contribute to both a 401(k) and a SIMPLE IRA in the same year.
Unless you work for two different companies simultaneously, contributing to both plans in one year is rare. An employer cannot offer both a 401(k) and a SIMPLE IRA at the same time.
Changing employers during the year is one way to contribute to both plans. This can happen if you switch jobs or if your employer switches from one type of plan to another during the year.
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Employer and Employee Roles
As an employee, you have a significant role to play in managing your retirement savings, especially if you're considering having a Simple IRA and a 401(k). Your employer may also have specific requirements and responsibilities when it comes to these plans.
Employers are required to match a portion of your 401(k) contributions, but this is not a requirement for Simple IRAs. In fact, Simple IRAs are designed to be more employee-friendly, with no employer matching contributions.
As an employee, you'll need to contribute to your Simple IRA or 401(k) on a regular basis to take advantage of the tax benefits and compound interest.
Employee Contribution Amount

An employee may defer up to $13,500 in 2020 and 2021, or $12,500 in 2016-2018, subject to cost-of-living adjustments for later years. Employees age 50 or over can make a catch-up contribution of up to $3,000 in 2016-2021.
The catch-up contribution is a great option for older employees who want to save more for retirement. This contribution is in addition to the regular deferral amount.
You can calculate the maximum deferral amount by considering the regular deferral limit and the catch-up contribution. For example, if an employee is 50 or over, they can contribute up to $16,500 ($13,500 + $3,000) in 2020 and 2021.
Here's a breakdown of the maximum deferral amounts for employees under and over 50:
Note that these amounts are subject to cost-of-living adjustments for later years.
Employer in Same Year
Employers can't usually offer both a SIMPLE IRA and a 401(k) in the same year, but there are some exceptions.

New rules allow employers to switch from a SIMPLE IRA to a safe harbor 401(k) mid-year, as long as they meet notice requirements.
Limited exceptions exist for separate collectively bargained employees.
Employers can't contribute to both a 401(k) and a SIMPLE IRA in the same year unless they change employers or switch from one type of plan to another.
If an employer switches from a SIMPLE IRA to a 401(k), they must follow notice requirements to make the change.
Employers who work for two different companies simultaneously can contribute to both a 401(k) and a SIMPLE IRA in the same year.
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Employee Notification Requirement
As an employer, it's essential to understand the employee notification requirement for a SIMPLE IRA. You must provide details to each eligible employee prior to their 60-day election period, which typically begins on November 2nd prior to each calendar year.
The details you need to provide include the employee's opportunity to make or change a salary reduction, your decision to make either a matching or nonelective contribution, and a summary description of the SIMPLE IRA.
Transition and Conversion
You can convert a SIMPLE IRA into a 401(k) plan, thanks to the SECURE 2.0 Act, which allows employers to make the switch for plan years beginning after December 31, 2023. This means you can replace your SIMPLE IRA plan with a traditional or qualified automatic enrollment arrangement (QACA) safe harbor 401(k) plan at any point during the year.
To make the switch, you'll need to provide the conventional 60-day notification period to your employees, even if you elect to make the switch mid-year. It's essential to plan ahead and decide when and how you intend to convert your SIMPLE IRA plan into a 401(k).
The conversion process involves a few key steps, including deciding to switch retirement plans, providing notice to your employees and your SIMPLE IRA provider, and helping your employees roll their existing SIMPLE IRA funds into their new 401(k) account or other eligible retirement accounts.
If you switch plans mid-year, you'll need to calculate your employees' maximum elective deferral limit by splitting the difference between the SIMPLE IRA plan's limit and the 401(k) plan's deferral limit. For example, if you switch plans at the start of Q2, you'll take 90/365 days of the SIMPLE IRA plan's limit ($16,000) and add it to 275/365 days of the 401(k) plan's limit ($23,000).
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How to Convert

To convert a SIMPLE IRA into a 401(k) plan, you'll need to follow the rules set by the SECURE 2.0 Act. This act allows employers to replace a SIMPLE IRA plan with a SIMPLE 401(k) plan or other 401(k) plan that requires mandatory employer contributions during a plan year.
You can elect to make the switch at any point during the year, but it's a good idea to provide a 60-day notification period to your employees, even if you're switching mid-year. This will give them time to adjust to the change.
You'll need to plan ahead and decide when and how you intend to convert your SIMPLE IRA plan into a 401(k). This will also involve determining your employees' maximum elective deferral limit.
To calculate this, you'll need to split the year into two parts: the time they were covered by the SIMPLE IRA plan and the time they'll be covered by the 401(k) plan. For example, if you switch plans at the start of Q2, you'll calculate the percentage of the year they were covered by the SIMPLE IRA plan and multiply it by the SIMPLE IRA plan's limit.
The SIMPLE IRA plan's limit is $16,000, and the 401(k) plan's deferral limit is $23,000. You'll need to take into account the number of days in each quarter and calculate the weighted average of the two limits.
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Employee Fund Transition
To switch retirement plans, you'll need to decide to make the change, which is a straightforward first step. This is a big decision that can have a lasting impact on your financial future.
You'll need to provide notice to your employees and your SIMPLE IRA provider, which can be done in a few easy steps. This is an important step to ensure a smooth transition for everyone involved.
Next, you'll need to help your employees roll over their existing SIMPLE IRA funds into their new 401(k) account, or into a non-Roth IRA or a Roth IRA. If they choose to roll over to a Roth IRA, they'll need to include any untaxed money in their income.
There are three main options for rolling over employee funds: into a 401(k), a non-Roth IRA, or a Roth IRA. Each option has its own requirements and implications.
Here's a quick rundown of the options:
This is a big decision that requires careful consideration of your employees' needs and financial goals.
Understanding and Comparison
A SIMPLE IRA and a 401(k) are two popular retirement plans, but they have distinct differences.
A SIMPLE IRA is designed for small businesses with fewer than 100 employees, whereas a 401(k) is available to companies with 1 or more employees.
The contribution limits for a SIMPLE IRA are lower, with a $16,000 limit in 2023, compared to a 401(k) which has a $23,000 limit.
Employers must contribute 2% non-elective or 3% matching contribution to each eligible employee's account in a SIMPLE IRA, whereas 401(k) plans have discretionary employer contributions.
In a SIMPLE IRA, all contributions are immediately 100% vested, whereas 401(k) plans can have a vesting schedule for employer contributions.
A SIMPLE IRA has minimal costs and low administrative responsibilities, whereas 401(k) plans have higher setup costs and administrative requirements.
The eligibility criteria for a SIMPLE IRA are different, requiring employees to have earned at least $5,000 in compensation during any 2 preceding calendar years and be expected to earn $5,000 during the current calendar year, whereas a 401(k) requires employees to be at least 21-years-old with at least 1 year of service.
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Here's a comparison of the key differences between SIMPLE IRA and 401(k) plans in a table:
Ultimately, the choice between a SIMPLE IRA and a 401(k) depends on the specific needs and circumstances of your business.
Frequently Asked Questions
What is the 2 year rule for SIMPLE IRA?
The 2-year rule for SIMPLE IRA states that assets can't be rolled over or transferred tax-free until 2 years after an employer's first contribution. This 2-year window starts on the day the employer makes their initial contribution to the employee's account.
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