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Open enrollment and year-end payroll don’t happen back-to-back by coincidence. They overlap on purpose, or at least on the calendar, since most employers run open enrollment in Q4 for benefits taking effect January 1, the exact same window when payroll needs to close out the year cleanly. Treated as two separate projects, that overlap creates real conflict. Mapped onto one calendar, it’s manageable.
Here’s what actually needs to happen, and roughly when, across both. For the full payroll-specific timeline, see the Year-End Payroll Checklist, part of the Year-End Payroll and Tax Season Guide.
October: Open enrollment opens, payroll data review starts
This is when open enrollment typically launches for most employers, and it’s also the right time to start reconciling employee data for payroll: legal names, addresses, and Social Security numbers. The two are more connected than they look, since incorrect employee data corrupts both the benefits elections you’re collecting and the W-2 data you’ll generate in January.
November: Enrollment closes, benefits deductions get built into payroll
Once open enrollment closes, new elections need to flow into payroll before the first pay period of the new plan year, which for most employers means before or right at January 1. This is also when year-end bonus amounts typically get finalized, so payroll and HR both have real deadlines converging in the same few weeks.
Early-to-mid December: Pre-close audit, benefits reconciliation
Payroll runs its pre-close audit across every pay group. HR reconciles completed benefits elections against what’s actually been entered into the system, catching any employee whose enrollment didn’t make it through cleanly. Both of these need to happen before the last payroll of the year, not after.
Last payroll of the year: Final numbers lock
The final pay run of the year reflects whatever benefits and payroll data was reconciled in the prior weeks. Anything missed here doesn’t get a second chance until next year’s W-2 correction process.
January: New benefits take effect, W-2s go out
New plan-year benefits deductions start hitting paychecks at the same time W-2s and 1099s are being distributed. It’s the busiest month on this calendar for both teams, which is exactly why the reconciliation work in October through December matters: it’s the difference between January being a distribution month and January being a correction month.
Frequently Asked Questions
Most employer benefit plans run on a calendar year, so open enrollment for January 1 coverage happens in Q4, the same window payroll needs to close out the current tax year. The overlap is structural, not a scheduling accident.
Employees can be over- or under-deducted on their first paychecks of the new year, which then requires a correction. Building in a reconciliation step in December, before the first January pay run, catches this before it reaches a paycheck.
Yes, ideally a shared one. Since the two workstreams feed each other, benefits data flows into payroll and payroll’s employee data accuracy affects enrollment, tracking them on separate calendars makes it easy to miss where a delay in one creates a problem in the other.
The last payroll of the year. It’s the point where both payroll data and benefits deductions need to already be correct, since there’s no second chance until a correction process starts in January.
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This article is for general informational purposes only and is not legal, tax, or accounting advice. Consult a qualified professional for guidance specific to your situation.
Disclaimer: Any product roadmap or future plans provided herein are for informational purposes only. They do not represent a commitment to deliver any material, code, feature, or functionality. Plans may change without notification. The development, release and timing of any features or functionality described remain at the sole discretion of Netchex, its affiliates, and partners. Netchex does not give legal, tax, or accounting advice. You are responsible for ensuring your use of Netchex product meets your individual business and compliance requirements.
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