And remember, with prior years testing, you know how much the HCEs can put away AS A GROUP. So if the NHCE % was 1.5% last year, the top group can put away 3% on average. That's great if everyone is on board. However, say, all the HCEs decide to put away 3% for the year, then one of them decides to spot for whatever reason halfway through the year. The the other HCEs can have the % raised a little. But nobody is going to really know that. The plan administrator cannot say, "hey guys, Erica decided to stop deferring for now, so you can go a little higher on your contributions."
I like to reiterate to the clients that if the plan fails testing it's not a red flag with the IRS or anything; and no one is going to turn them into the DOL. It's a fact of life.
And again, if the HCEs did the absolute maximum under the testing rules, hit the numbers exactly, then whatever above that is going to be taxed in their paycheck anyway. (And, if the funds go up during the year, they get the earnings in the refund, too. Sure, they pay tax on it, but it's still extra money. It's like saying "here's an extra hundred bucks, but I have to keep $35 for taxes, so I'm just gonna give you $65. For doing nothing, really." I'd take that.