Originally Posted by
jumppilot
1) Once you reach 415(c) limits (for 2018 $55,000 if under 50, $61,000 if over 50) your 16% will spill over. That $55,000 is a mix of your and company contributions. Post tax contributions will allow you to reach that $55,000 limit quicker allowing more spill over of the company 16%.
2) I didn't realize there used to be a max percentage you could contribute. I set 30% until I max my 401(k). Andy's example he sets it at 100%.
When the 401k was passed into law in 1978 the most you could put in pre-tax was 25% of your income. They raised it to 50% in the 90s, and in the last 10 years they raised it to 100% of you income. But you can only put in until you hit the max dollar amount.