Only wildcard here is if you're expecting a raise at some point during the year.
Why does that matter? Isn't the match only on a percentage of your total contribution, which is capped at $17,500? I don't think when you contribute matters, as long as you contribute.
It matters with my current employer. Their policy is you contribute 2%, they quadruple that at 8%, and they do this on a per-month basis. If you don't contribute that 2% for
that specific month, you miss their match that month.
Let's say you front-loaded and were done by April. And let's say you left just enough room under the 17.5 cap to allow you to continue to contribute 2%/mo for the remainder of the year.
Suddenly you get a 10% raise -- well, you'll hit that 17.5 cap in November now. No match in December for you.
It sounds like this situation is atypical but it's how it works at my place. That's all I meant when I mentioned raise could be a potential wildcard.