The most expensive calls I get usually start the same way. “Our payroll provider handles the TPA work too, and something went wrong.” Contributions were missed, eligibility was misapplied, or the match didn’t follow the document. The assumption is that bundling payroll and TPA eliminates errors. In reality, it often hides them until it’s too late.
One System, One Interpretation, One Point of Failure
When the same provider runs payroll and administration, everything flows through a single system and a single interpretation of the plan document. That sounds efficient, until the setup is wrong. If eligibility is coded incorrectly or compensation definitions don’t align with payroll fields, the error repeats every pay period. There’s no independent TPA catching the issue because the same entity created it. What looks like integration is often just duplication of risk.
Plan Design Still Has to Fit the System
Sponsors assume the bundled provider will translate the document into something workable. That’s not how it works. The system is built to handle standard designs. Once you layer in complex eligibility, non-standard compensation, or nuanced matching formulas, you’re relying on configuration, not expertise. If the design doesn’t match how payroll actually runs, the system won’t fix it. It will process it wrong, consistently.
Delegation Doesn’t Change Liability
The biggest misconception is that bundling services shifts responsibility. It doesn’t. Under ERISA, the plan sponsor owns the result. When errors happen, it’s the sponsor writing the check for corrective contributions and explaining it to participants. The provider may help fix it, but they’re not absorbing the liability. That’s the part no one focuses on during the sales process.
By the Time You Call, It’s Cleanup
By the time the issue surfaces, it’s already expensive. Now we’re talking about corrections, earnings, notices, and time spent unwinding months or years of bad data. The fix isn’t finding a better cleanup process. It’s making sure the plan design actually works within the system before it ever goes live. Because when payroll and TPA are the same shop, there’s no second set of eyes coming to save you.