401(k) Audit Requirements – Complete Guide for Employers

Introduction

Imagine you and your classmates are saving money for a huge graduation trip years from now. Every month, you put $10 in a box. After five years, that box would have a lot of money! To make sure the money is still there and that the teacher is counting it correctly, you would want someone to come in and double-check everything.

What is a 401(k) audit?

In the world of business, a 401(k) audit is a formal “review” of a company’s retirement plan. An independent expert (called a CPA) looks at the plan’s “report card” to make sure the company is following the law and keeping the employees’ money safe.

Why is it important to know 401(k) audit requirements?

If a company forgets to do an audit, they can get in big trouble with the government. They might have to pay heavy fines (like a very expensive “late fee”). Knowing the rules helps the boss keep the company running smoothly and ensures the workers can trust that their money is safe.

Who is this guide for?

This guide is for bosses, managers, or anyone who wants to understand how the government protects workers’ savings.

What Are 401(k) Audit Requirements?

Definition of a 401(k) audit

An audit is like a professional “fact-check.” The auditor looks at bank statements, payroll records (how much people get paid), and the “Rulebook” of the plan to make sure everything matches up.

The role of ERISA and the Department of Labor (DOL)

There is a law called ERISA (passed in 1974). It’s like the “Constitution” for retirement plans. The Department of Labor (DOL) is the group of “government referees” who enforce these rules. They want to make sure that if you save money today, it’s actually there for you 30 years from now.

When is an audit required?

Not every company needs an audit. It usually depends on how many people are in the plan. Most small businesses don’t need one, but once a company grows “large,” the government requires a check-up every year.

Who Needs a 401(k) Audit?

100+ eligible participants rule

The most important number to remember is 100.

• The New 2023 Rule: Starting in 2023, the government changed the rules. Now, you only count people who actually have money in their account.
• The Old Rule: You used to have to count everyone who could join, even if they hadn’t saved a penny. This change made it much easier for small businesses.

Small plan vs. large plan explained

• Small Plan: Usually has fewer than 100 people with money in the plan. They file a simple report and usually do not need an audit.
• Large Plan: Usually has 100 or more people with money. They must have an audit every year.

Safe harbor exception in a nutshell

A “Safe Harbor” plan is a special type of 401(k) where the boss promises to give everyone a certain amount of extra money automatically. While this helps with some government tests, it does not let a large company skip the audit. If you have over 100 people with money, you still need an audit, even if it’s a Safe Harbor plan.

When Is a 401(k) Audit Required?

Plan Year Timeline

Most companies run their plan from January 1st to December 31st. The auditor usually starts their work in the spring.

Form 5500 filing deadline

The “homework” for the plan is called Form 5500.

• It is due on July 31st (the 7th month after the year ends).
• If the boss needs more time, they can ask for an extension until October 15th.

What are the problems with a late audit?

If the audit is late, the government might charge the company over $2,500 per day in fines! That is a lot of money that could have gone to the workers instead.

Key 401(k) Audit Requirements Checklist

When the auditor comes to the office, they will ask for a lot of papers. Here is what they look for:

1. Participant Data: Are the names, birthdays, and hire dates correct?
2. Contributions: Did the $50 taken from Sally’s paycheck actually make it into her 401(k) account on time?
3. Vesting: If an employee leaves the company, do they get to take the company’s “gift” money with them? (This depends on how long they worked there).
4. Plan Documents: This is the “Rulebook.” The company must follow its own rules!
5. Statements: Bank and investment records that prove the money exists.

Types of 401(k) Audits

There are two main ways to do an audit. Think of it like a “Check-up” vs. an “X-ray.”

Limited-Scope Audit (Section 103(a)(3)(C) Audit)

This is the most common type.

• When used: When a big, trusted bank (like Fidelity or Vanguard) holds the money and “certifies” that their records are correct.
• Limitations: The auditor doesn’t have to double-check the bank’s math because the bank is already trusted by the government.

Full-Scope Audit

• What it is: The auditor checks everything from scratch.
• When needed: If the bank holding the money isn’t “certified” or if the boss wants an extra-deep look.
• Cost: It takes more time and costs more money.

Common 401(k) Audit Mistakes to Avoid

1. Wrong Headcount: Counting people who don’t have money in their accounts (or forgetting people who do).
2. Slow Deposits: Taking money from a paycheck on Friday but not putting it in the 401(k) until two weeks later. (The government says you must do it “as soon as possible”).
3. Missing Papers: Losing the “Rulebook” or not keeping track of when someone was hired.

How to Prepare for a 401(k) Audit

Preparation is like studying for a big test.

• Gather documents: Payroll records, bank statements, and the Plan Document.
• Talk to the Team: The HR person, the payroll person, and the 401(k) helper (TPA) all need to work together.
• Stay Organized: Keeping digital files makes the audit go faster and costs less money.

Cost of a 401(k) Audit

Typical cost range

An audit is not cheap. It usually costs between $8,000 and $15,000.

What factors increase costs?

• If the company has 5,000 employees instead of 150.
• If the records are messy and disorganized.
• If the auditor finds a lot of mistakes they have to fix.

Penalties for Not Meeting Requirements

If a company ignores the rules, two groups will be unhappy:

1. The DOL: They can fine the company thousands of dollars for every year they missed.
2. The IRS: They might take away the “tax-free” benefits of the plan, which hurts everyone’s savings.

How a CPA or Audit Firm Helps

A CPA (Certified Public Accountant) is like a “safety inspector.”

• They help find mistakes before they become big problems.
• They give the boss peace of mind.
• They make sure the company is following the law so the workers’ money stays safe.

FAQs About 401(k) Audit Requirements

When is a 401(k) audit required for the first time?

When your plan has more than 100 people with account balances on the first day of the year.

What is the 80–120 rule?

This is a “grace period.” If you had 90 people last year and 110 this year, the government lets you stay a “Small Plan” for one more year so you don’t have to rush into an audit. You only must audit once you hit 121 people.

Does a safe harbor plan require an audit?

Yes, if it has 100+ people with money. Being “Safe Harbor” doesn’t get you out of the audit.

Conclusion

Keeping a 401(k) plan healthy is a big job, but it is very important. It’s all about making sure that when people work hard for years, their money is waiting for them when they are ready to rest.

Key Takeaways:

• 100 is the magic number (count people with money!).
• July 31st is the big deadline.
• Organization saves money and stress.

If you are a boss, don’t try to do this alone! Getting help from a professional CPA firm is the best way to make sure you are doing everything right.

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