Do Part-Time Jobs Offer 401(k)? Hour Thresholds and Vesting

Yes, many part-time jobs do offer 401(k) access. When an employer already sponsors a plan, federal law requires it to let part-time employees contribute once they meet one of two service thresholds: 1,000 hours in a single year, or at least 500 hours in two consecutive years. The two-year figure took effect for plan years beginning in 2025, down from three years, so more part-timers qualify now than at any point since the rule was created.

Your Employer Has To Have a Plan First

No federal law requires an employer to establish a 401(k) or any other retirement plan.¹ The Employee Retirement Income Security Act of 1974 sets minimum standards only for plans that already exist.² If your employer simply does not sponsor one, the part-time eligibility rules below do not open a door that is not there. Skip to the last section for what to do in that case.

The Two Ways a Part-Timer Gets In

1,000 Hours in a Year

The long-standing rule requires 1,000 hours of service within a 12-month measurement period, plus reaching age 21. That works out to roughly 20 hours a week. Your measurement period usually starts on your hire date and may shift to the plan year after your first anniversary.³ There is no upper age cap; a plan cannot shut you out for being too old.⁴

Work 20 or more hours a week fairly consistently and you will likely cross 1,000 hours before the year ends.

500 Hours in Two Consecutive Years

Workers who average fewer than 20 hours a week have a second route. The SECURE Act of 2019 created a long-term part-time (LTPT) rule that opens a plan to employees who log at least 500 hours a year over consecutive years, even if they never hit 1,000 in any single one.⁵ The original threshold was three consecutive years. SECURE 2.0 cut it to two, effective for plan years beginning after December 31, 2024.⁶

So a part-timer who logs at least 500 hours in both 2024 and 2025 becomes eligible in 2026. Five hundred hours works out to about 10 hours a week. SECURE 2.0 also extended the rule to ERISA-covered 403(b) plans, which cover many workers at schools, hospitals, and nonprofits.⁶

What a Slow Year Does to Your Progress

Whether a low-hours year sets you back depends on which side of the eligibility line you are on.

Before you qualify, your consecutive years have to be unbroken. Drop below 500 hours during one of your two qualifying years and the count resets; prior years between 500 and 999 hours no longer help toward the consecutive requirement.⁵

After you qualify, you keep your right to participate even if a later 12-month period comes in under 500 hours. You just do not earn vesting credit for that period.⁵

Seasonal work shows how this plays out. A seasonal employee hired in 2024 who works at least 500 hours in both the 2024 and 2025 seasons meets the two-year threshold and can start contributing when the 2026 season opens. Skip an entire season after that and no vesting credit accrues for the missed year, but the door stays open.

Matching and Vesting Look Different for Part-Timers

Getting through the door means you can defer your own money through payroll. It does not guarantee an employer match. Federal law does not require employers to match workers who qualified solely through the 500-hour LTPT route.⁵ Some employers extend their match anyway; others keep it tied to the 1,000-hour standard.

When an employer does contribute, you earn ownership through a vesting schedule. Federal law permits a graded schedule that starts at 20 percent after two years of vesting service and reaches 100 percent after six.⁷ For LTPT workers, each 12-month period with at least 500 hours counts as one year of vesting service. Your own contributions are always fully yours from day one.

Auto-Enrollment in Newer Plans

If your employer’s 401(k) was created on or after December 29, 2022, SECURE 2.0 requires the plan to automatically enroll all eligible employees, LTPT workers included, starting with plan years that began on or after January 1, 2025. The default contribution rate is at least 3 percent of pay (no more than 10 percent initially) and rises by 1 percentage point a year to at least 10 percent, capped at 15 percent.⁸

You can opt out or set your own rate at any time. Small businesses, church plans, government plans, and any plan that existed before December 29, 2022, are exempt from the mandate, though many older plans auto-enroll voluntarily.

What You Can Contribute Once You Qualify

The same limits apply whether you are part-time or full-time. For 2026, the elective deferral limit is $24,500. Workers 50 and older can add an $8,000 catch-up, for $32,500 total. Workers ages 60 through 63 get a larger $11,250 catch-up, for $35,750.⁹ You can never defer more than you earn.

Lower-income part-timers should look at the Retirement Savings Contributions Credit, better known as the Saver’s Credit. It is a direct tax credit worth 10, 20, or 50 percent of up to $2,000 in contributions ($4,000 for joint filers), depending on income.¹⁰ For 2026, the credit phases out at $40,250 for single filers, $60,375 for head of household, and $80,500 for married filing jointly.⁹ A part-timer earning $25,000 who contributes $1,000 to a 401(k) could see up to $500 back at tax time.

If Your Employer Has No 401(k) at All

The LTPT rules cannot help you if the plan does not exist. You can still open a traditional or Roth IRA yourself. For 2026, the IRA contribution limit is $7,500.⁹ If neither you nor your spouse is covered by a workplace plan, your traditional IRA contribution is fully deductible regardless of income.

A growing number of states require employers without a qualified plan to enroll workers in a state-run payroll-deduction IRA. Thresholds vary; some states apply the mandate to employers with as few as one employee, others set the floor at five. The account belongs to you and follows IRA rules, not 401(k) rules.

If You Should Have Been Enrolled and Were Not

When an employer mistakenly excludes an eligible part-timer, the employer, not you, is on the hook to fix it. The standard correction is an employer contribution to your account equal to 50 percent of the deferrals you missed, based on what similarly situated employees contributed. That contribution is fully vested right away. If the employer catches the mistake quickly and starts your deferrals, the corrective contribution drops to 25 percent, and for errors lasting fewer than three months that are fixed fast, no corrective contribution may be required at all.¹¹ Employers can use the IRS’s Employee Plans Compliance Resolution System to correct problems voluntarily.¹²

If you think you qualified and were left out, raise it with the plan administrator and keep your own hour-by-hour records to back up the claim.

1
U.S. Department of Labor. FAQs About Retirement Plans and ERISA
2
U.S. Department of Labor. ERISA
3
Office of the Law Revision Counsel. 29 USC 1052 – Minimum Participation Standards
4
Internal Revenue Service. 401(k) Plan Qualification Requirements
5
Federal Register. Long-Term, Part-Time Employee Rules for Cash or Deferred Arrangements Under Section 401(k)
6
Internal Revenue Service. Notice 2024-73 – Additional Guidance With Respect to Long-Term, Part-Time Employees
7
Office of the Law Revision Counsel. 29 USC 1053 – Minimum Vesting Standards
8
Federal Register. Automatic Enrollment Requirements Under Section 414A
9
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
10
Internal Revenue Service. Retirement Savings Contributions Credit (Saver’s Credit)
11
Internal Revenue Service. 401(k) Plan Fix-It Guide – Eligible Employees Were Not Given the Opportunity to Make an Elective Deferral Election
12
Internal Revenue Service. EPCRS Overview