Rehires and Breaks in Service: What Sponsors Must Reinstate

Rehires and breaks in service are one of the quietest sources of 401(k) operational failures a plan sponsor will ever face. Payroll treats the returning worker as a brand-new hire, the recordkeeper receives a new hire date, and the plan quietly ignores years of service the plan document says must still count. Nobody notices until an audit, a distribution request, or a vesting dispute forces someone to reconstruct an employment history that HR no longer has.

This is a fiduciary problem, not a payroll problem. Applying the plan’s eligibility and vesting rules to real people is a discretionary administrative act, and it belongs to whoever holds the ERISA plan administrator role. Here is what employers need to get right when someone comes back.

Why a rehire is not a new hire

Almost every pre-approved plan document says that service already credited to a participant stays credited unless a specific set of break-in-service rules applies. In practice that means a rehired employee often carries back:

• prior eligibility service — they may be eligible again immediately rather than waiting out a new waiting period;
• prior vesting service — the vesting percentage they left with is usually the floor, not zero;
• prior plan entry — re-entry frequently happens on the rehire date rather than the next scheduled entry date;
• an existing deferral election or automatic enrollment status, depending on how the document is written;
• in some cases, a right to have a previously forfeited account balance restored.

The single most common mistake is the default assumption that a new employee record equals a new participant. The plan document, not the HRIS, controls.

What a “break in service” actually means in your document

“Break in service” is a defined term, and the definition is specific to your plan. It is measured by the plan’s service-crediting method — hours counted over a computation period, or an elapsed-time method that looks at periods of employment rather than hours. Plans using different methods can reach different answers on the same person.

Before you decide anything about a rehire, pull the adoption agreement and read four things: the service-crediting method, the eligibility computation period, the vesting computation period, and the break-in-service and rehire provisions. If your document uses a rule that disregards or restores service after a defined number of consecutive break years, you need to apply it exactly as written — including the direction it runs. Do not approximate, and do not carry a rule over from a prior plan or a prior provider.

Seven things to check on every rehire

1. Original hire date and all prior termination dates

You need the full employment history, not just the latest record. This is the piece employers most often cannot produce, especially after a payroll conversion or an acquisition. Keep original hire dates in a field that survives rehire processing.

2. Prior eligibility status

If the employee had already satisfied the plan’s eligibility conditions before leaving, most documents let them re-enter immediately on return. Making them serve a fresh waiting period is an operational failure, and it is the version of this error that creates missed-deferral corrections.

3. Vested percentage at termination

Their prior vesting service does not disappear because they left. Confirm the vested percentage that applied at termination and make sure the recordkeeper’s vesting service count reflects pre-break service, not just service since the rehire date.

4. Whether a distribution was taken

A rehire who was cashed out is treated differently from one who left the balance in the plan. Some documents allow a repayment right that restores the forfeited portion if the participant repays the distribution within the period the document specifies. If your plan has that feature, someone has to tell the participant about it — silence is not a neutral choice.

5. Forfeited amounts that may need restoring

If a nonvested balance was forfeited after the employee left and the document requires restoration on rehire, the plan owes that money back to the participant’s account. The restoration source is specified in the document and usually interacts with the plan’s forfeiture account. Track forfeitures by participant, not just as a pooled dollar figure, or restoration becomes impossible to compute later.

6. Deferral elections and automatic enrollment

Does a rehire’s old election revive, or do they get a fresh enrollment window? Does your automatic enrollment design re-apply the default rate, and if so at what escalation step? Documents differ, and payroll defaults almost never match the document unless someone checks.

7. Outstanding loans

A loan that was still outstanding at termination may have been offset or deemed distributed, or it may still be live with repayments needing to restart through payroll. Getting this wrong produces the exact reporting mess described in our guide to loan defaults and deemed distributions.

Where sponsors get hurt

• Payroll assigns a new hire date and the recordkeeper feed silently restarts eligibility and vesting from zero.
• Seasonal, temporary and variable-hour staff cycle in and out repeatedly, and no one applies the break rules consistently across the group.
• Acquisitions bring employees whose prior service must be credited under the transaction documents, which the rehire logic never sees.
• Employment histories are lost in a payroll conversion, leaving no way to prove the service used for a vesting determination.
• Forfeitures were pooled with no participant-level detail, so a required restoration cannot be calculated.
• Nobody documents the decision, so two similar rehires are handled two different ways.

The last one matters more than it looks. Inconsistency across similar employees is what turns a technical error into a finding, and consistency is what a documented process produces. The same discipline shows up in reconciling payroll and recordkeeper records generally.

A self-check you can run this quarter

1. Pull a list of everyone hired in the last two plan years who has a prior employment record with you.
2. For each, compare the hire date in payroll with the original hire date in the historical record.
3. Compare the eligibility date and entry date the recordkeeper used against what the document requires for a rehire.
4. Compare vesting service on the recordkeeper’s system against total credited service, pre-break included.
5. Flag anyone who took a distribution before returning and check whether a repayment or restoration right applies.
6. Check whether any forfeiture recorded for that person requires restoration.
7. Confirm deferral elections and any automatic enrollment default actually match the document.
8. Confirm loan status and repayment restart for anyone who had a loan at termination.
9. Write down what you found and what you did, and keep it with the plan’s records.

If the review turns up errors, they are correctable — but correction methods depend on the type of failure and how long it ran. Missed deferral opportunities, incorrect vesting payouts and unrestored forfeitures each have their own path. Get advice before you pick one, and document the reasoning. The broader pattern is covered in our piece on what happens when plan documents and operations disagree.

What you can delegate and what stays with the employer

Deciding what the plan’s rehire and break-in-service rules should say is a settlor act — that is the employer choosing plan design, and it cannot be handed off. Supplying accurate employment data is also employer-only: original hire dates, termination dates, rehire dates and hours are yours, and no service provider can reconstruct them.

What can be delegated is the administration: applying the document’s rules to each returning employee, determining eligibility and entry, calculating credited service and vesting, directing forfeiture restoration, instructing the recordkeeper, and keeping the evidence that the determination was made correctly. That is the work a 3(16) plan administrator is built to absorb, and it is why the plan administrator role is distinct from the trustee role.

Where Admin316 fits

Most providers will process what your payroll feed tells them and call the result your responsibility. Admin316 goes further: we accept the ERISA 402(a) named fiduciary appointment — the appointment most providers decline — and take on the discretionary administration that comes with it, including the rehire and break-in-service determinations that quietly decide what participants are owed. You still own plan design and your own employment data. We own applying the document correctly and proving we did.

If you have had turnover, seasonal staffing, or a payroll conversion in the last two years, your rehire records are worth a look before an auditor asks. Book a time with Admin316 and we will walk your plan’s break-in-service rules against what your systems are actually doing.