<prompt> Human: Hi I am long time lurker, first time poster.Some background information. I have just started a new job recently, I am in my very early 30s and I make 130k with 15-20 bonus. I have no debt and I own 1 house 1 rental condo with a very affordable mortgage. I am very financially sound at this point of my life.I have always contribute 6 to my 401k per my employer match limit, but I never put in the max contribution limit. So for the last couple years I have been contributing 6-7k with 6 employer match, I was marking around 100k base at my last job.I know this year the max contribution is 18500k. I feel like I am financially at a point where I can very comfortably max out my 401k limit without having to change my lifestyle. So here is my question. I have the option to contribute up to 50 of my bonus to 401k and I would prefer to contribute from my bonus as I believe it has a higher withholding tax rate than my base salary. However since I dont know exactly how much I will get for my bonus. What shouldcan I do to make sure I hit the 18500 limit?i.e. if I select 6 from my normal pay. That will give me around 7800 contribution. If I get conservatively speaking 15130000 19500509750. 7800975017550 which puts me about 1k short. On the other hand if I get a higher bonus I will go over the limit. So I am not sure how I can hit the 18500 limit exactly. What if I go over the limit what will happen then?Thank you in advance for the advice, sorry if there is typo, posting this on my phone  <response>: 1 Your bonus isnt taxed at a different rate. The rate on the actual check is typically higher, but when taxes are calculated at the end of the year you would get it back. The income calculations are actually independent of your withholding. 2 Every company Ive worked for just starts adding the money to your paycheck after you hit 18500. You may want to double check with HR, but thats probably it. 