We know the employee deduction limit for the 401(k) is $15,500 for 2007 and 2008 (no increase next year), and if one turns 50 during the year, they have a $5000 catch-up addition. But I rarely see a percent limit mentioned, and googling hasn't helped, not has a search at IRS.gov.
I ask because while checking my Flexible Spending Account balance to submit the final receipts, I saw my benefit site had this note: "New: You can contribute up to 75% of your pay to the 401(k) plan, up to the annual IRS dollar limit." For what it's worth, the percent limit was 30% for this plan in 2007, and 2006. I'm curious if this is related to the "highly compensated" imbalance rules, where a 401(k) can have issues if they don't pass a complex set of rules which compare the deferrals of the higher compensated to the average, er, Joe employee, or if the IRS has a maximum percentage allowed, and I just can't find it.
I know someone will ask why in the world would one want to withhold such a high percentage? A) One spouse retiring, so total gross still high enough to justify the pretax savings. Work 3 months, max out the 401(k) and call it quits. B) Changing jobs, new employer may have a waiting period, same motive to max out early in the year. C) Just to front load the savings (and use liquid cash to get by those few months) and save post tax the rest of the year. D) Fear of layoff in second half of year. etc.....
JOE