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Why do employers require you to spread your 401(k) contributions throughout the year to get the maximum match?
If one makes say, $10K/mo, and the company will match the first 5% dollar for dollar, a 10%/mo deposit of $1K/mo will see a $500/mo match. If the employee manages to request 90% get put into the 401(k), after 2 months, he's done.  If the company wished, they could continue the $500/mo match, I agree. They typically don't and in fact, the 'true up' you mention isn't even required, one is fortunate to get it. Many companies that match are going the other way, matching only after the year is over. Why? Why does any company do anything? To save money. I used to make an attempt to divide my deposit over the year to max out the 401(k) in December and get the match real time, not a true up.