What Happens to Your Company 401(k) When You Sell the Business

You are selling the company. The purchase agreement covers the equipment, the receivables, the name on the door. Somewhere behind all of it sits the 401(k) plan you set up years ago. It does not sell with the business. What happens to it depends on how the deal is structured, and the decision has a deadline most sellers never see coming.

Two Deals, Two Different Outcomes

Every business sale is one of two things. An asset sale or a stock sale. The buyer purchases the things your company owns, or the buyer purchases the company itself.

Your 401(k) does not care about the price. It cares about that structure. The plan is sponsored by a legal entity. In a stock sale, that entity changes hands. In an asset sale, it does not. Everything that follows flows from that one distinction.

The Asset Sale: The Plan Stays With You

In an asset sale, the buyer takes the equipment, the contracts, the customer list, the name. The buyer does not take your legal entity. And the plan belongs to the entity.

So the plan does not transfer. It stays behind with a company that may soon have no revenue, no payroll, and no reason to exist. The seller is generally the one who has to decide its fate before closing, and for most sellers the realistic path is termination.

The mechanics here tend to cooperate. Employees who go to work for the buyer have severed employment with your company. Severance from employment is a distributable event under a 401(k). Former employees can take their money or roll it into an IRA or the buyer's plan, and the plan can be wound down.

Wound down is not the same as walked away from. Someone adopts the termination amendment. Someone directs the final contributions. Someone distributes every account, tracks down the missing participants, and files the final Form 5500. That someone is the seller. Often a year after the seller thought the deal was done.

The Stock Sale: The Plan Goes With the Company

In a stock sale, the buyer acquires the entity, and the entity sponsors the plan. The plan rides along whether anyone thought about it or not. On the day after closing, the buyer owns your 401(k), including every operational error in its history.

Buyers know this. That is why buyer's counsel routinely asks the seller to terminate the plan before closing. Not at closing. Before it.

Why would one day matter? Because of the successor plan rule.

A terminated 401(k) can generally pay out elective deferrals only if the employer does not maintain another defined contribution plan — a successor plan — during the roughly twelve-month period that follows the termination. In a stock sale, your company and the buyer become one employer group at closing. Terminate the plan after closing while the buyer runs its own 401(k), and the buyer's plan is generally a successor plan. Distributions are blocked. Participants cannot be paid out. The usual fix is a plan merger, which hands the buyer your plan's full compliance history — the exact thing it was trying to avoid.

Terminate by board resolution dated before the closing date and the analysis generally changes, because at the moment of termination the buyer was not yet the same employer. That is why the resolution shows up as a condition to closing. One document. One date. A completely different outcome for every participant.

Partial Termination: The Vesting Question

A sale can accelerate vesting even when the plan survives. When an employer action — a sale, a layoff, a facility closing — pushes a significant share of participants out of the plan, the plan may have a partial termination. The IRS applies a rebuttable presumption around a 20% drop in participation. Affected employees become 100% vested in employer contributions.

A full plan termination does the same for everyone. Match and profit sharing balances that would have been forfeited are not. A seller who counted on forfeitures to offset final plan costs is counting on money that vests instead. That number belongs in the deal math early.

The Timeline That Actually Exists

• Stage 1 — letter of intent, roughly 60 to 120 days before closing. Deal structure is set here, and structure decides the plan question. Asset or stock. Terminate before closing or merge plans after. This is when the plan's treatment gets written into the term sheet and, later, the purchase agreement.
• Stage 2 — the resolution, before the closing date. The board resolution, the termination amendment, the freeze on new contributions, the 100% vesting. Dated before closing or not at all.
• Stage 3 — the wind-down, up to 12 months after closing. Participant notices, distributions, rollovers, the hunt for former employees, and the final Form 5500 once the last dollar leaves the trust.

Why This Belongs in the Letter of Intent

Most sellers file the 401(k) under closing logistics, next to the utility transfers and the key handoff. That's backward.

The plan's outcome is decided by deal structure, and deal structure is decided at the letter of intent. By the time a closing checklist exists, the only question left is whether the paperwork matches a decision that was already made — or already missed. A resolution that needed a date before closing cannot be signed after it. There is no retroactive fix.

Should you work through any of this alone? No. The plan document controls what the plan can do. The purchase agreement controls what the deal requires. Your CPA, your ERISA counsel, and your TPA are the ones who reconcile the two. Raising the plan at the letter of intent means they still have time to do it.

Bottom Line

Your 401(k) is not an asset of the deal. It is a separate legal arrangement with its own rules, its own deadlines, and its own paperwork, and the sale structure decides what happens to it. Asset sale, the plan stays with you. Stock sale, it goes with the company — unless it is terminated first.

The successor plan rule is why timing carries so much weight. A termination dated before closing and a termination dated after closing are different events with different consequences, separated by days.

We work with closely held business owners on qualified plans, and this question belongs at the letter of intent, not the closing table. This piece is education, not legal or tax advice. The actual answer for your plan lives in your plan document, your purchase agreement, and the judgment of your own CPA, ERISA counsel, and TPA.