Employee 401(k) deferrals aren't due whenever you get around to filing them. The Department of Labor requires deposits as soon as the funds can reasonably be separated from your company's general assets, and for most small businesses, that window is a lot narrower than the "you have until next month" assumption a lot of employers operate under.
For plans with fewer than 100 participants, the DOL gives you a 7-business-day safe harbor after the pay date. Deposit within that window and you're automatically considered timely. For plans with 100 or more participants, there's no safe harbor at all. You're held to "the earliest date reasonably possible," and if your company has a track record of depositing in three or four days, that history becomes your legal benchmark, not the general rule.
There's a hard outer limit too - the 15th business day of the month following the one when the money was withheld. But that's not a grace period. It's the absolute latest the DOL will ever consider acceptable, and treating it as your target is a compliance problem in itself.
A late deferral deposit isn't a paperwork miss. The DOL classifies it as a prohibited transaction, a loan from the plan to the employer, which triggers a fiduciary breach. Fixing it means calculating and paying lost earnings to every affected employee for the period the money sat outside the plan, and in some cases reporting the correction on your plan's Form 5500.
None of that is catastrophic for a one-time, few-day miss. But it's the kind of finding that shows up in a plan audit, and it's exactly the sort of thing a recordkeeper or auditor flags when contribution timing is inconsistent from pay period to pay period.
Here's what the DOL's rule doesn't show: consistency matters as much as speed. If you're building and uploading a contribution file by hand, your deposit timing depends on whoever's doing that task that week being available, undistracted, and up to date on the recordkeeper's file spec. A vacation, a busy close, a new hire still learning the process. Any of those can push a deposit from "day 3, comfortably inside the safe harbor" to "day 9, now outside it."
That's the risk automated integration removes. With Pay(k)onnect, contribution data transmits to your recordkeeper automatically after every pay run, on the same schedule every time, regardless of who's out that week or how busy payroll close is.
Most standard 401(k) plans qualify. A few plan designs limit it, like per-pay-period discretionary employer contributions or multiple payroll providers under one plan. Your Exact Payroll representative can confirm eligibility for your specific setup.
Worried your deposit timing isn't as consistent as it should be? Contact Exact Payroll to see if Pay(k)onnect integration is a fit for your plan.