I am about to get a good bonus, should I take it all or let part of it go into my 401(k) account? Is it any different than if I decide to put similar amount of money in 401(k) at some other time of the year?

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    What are your goals (both short and long term)? What is your financial situation (debt, current retirement savings, etc)? – Pete B. Feb 8 '17 at 17:13
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    In addition to @PeteB. 's questions, what tax bracket are you in, and will the bonus change your marginal rate? – NL - Apologize to Monica Feb 8 '17 at 17:16
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    If you have a company match, and could contribute the maximum 18500, make sure you'll get maximum match by not filling up the limit before your last December paycheck. – user662852 Feb 8 '17 at 20:44
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    @user662852 If the company matches contributions from the bonus, it doesn't really matter which checks contribute to the match. – chepner Feb 9 '17 at 12:58
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    @stannius: for your question, I do have the flexibility to change the contribution at per paycheck level, so I can potentially reduce my contribution when the bonus is due, and thus avoid moving too much of my part in 401K, while not getting as much from company match. Once the bonus is paid out, I can change the 401K contribution again. – V_Singh Feb 10 '17 at 8:42

One factor to consider is that some employers have a 401k contribution match policy that only allows a certain percentage of any given paycheck to be matched. So if the company is willing to match 4% of each paycheck, you could run into a problem here where you lose out on some of your company match.

For example, suppose you get a $20,000 bonus. You can contribute $18,000 per year to your 401k and this bonus could be a nice way to knock most of that out and then take home your full paycheck the rest of the year. Sounds pretty nice, but there's a problem. The company will only match 4% of your $20,000 ($800) when they otherwise would have matched up to 4% of your annual salary ($4,000 if you're making $100,000 in this example).

I'd say it's definitely worth it to make a big contribution to your 401k when you get a bonus as it's an easy way to get a lot of money in there without really feeling a loss (since it's extra money on top of your normal paycheck). But I'd definitely be careful about this situation. You don't want to throw away free money. To avoid this problem, make sure that you leave enough of your annual limit so you can contribute enough to get your 4% company match on every paycheck of the year.

  • yes, the velocity component is just as important as the amount component, if you have a match – CQM Feb 8 '17 at 22:51
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    Note that the company may only contribute a maximum for each pay check, but may still compute its match for the year as a whole. As a simple example, say I had contributed 150% for the first 8 months of the year, then 0% for the remaining 4. I still received the same match as if I had contributed 100% each month. The early months were capped, but in the later months I got the "make-up" match. – chepner Feb 9 '17 at 13:10
  • Daniel: what do you say about @chepner comment? I guess that is my real question, where do I stand to gain more from company contribution? – V_Singh Feb 10 '17 at 8:47
  • @V_Singh I completely agree with chepner's comment. You will have to find out what the matching policy at your company is in this respect. – Daniel Feb 10 '17 at 12:19

Is it any different than if I decide to put similar amount of money in 401(k) at some other time of the year?

Not from a tax standpoint, but if can affect a few other things:

  • You will start earning returns (or face losses) earlier if you take it out of your bonus now versus take it out from future paychecks
  • If your total contributions including your bonus contribution will hit the annual maximum, you will hit that ceiling earlier and stop future contributions. (e.g. you might not have any 401k taken out in December)

Since the earnings difference is likely negligible (you miss out on returns for only a few months), I would look at other conditions -

  • Do I have any debt that I can pay off with the bonus versus investing it?
  • Do I have enough in an emergency fund or should I use the bonus to fund it?
  • Do I have other saving/spending goals that I want to apply it to (college, next car, down payment on house, etc.)

In the long run it probably won't make much difference, but knocking out obstacles to wealth building can give you a sense of accomplishment that will encourage smart money decisions going forward.


If you aren't already contributing the maximum allowable amount, by all means do so.

If you are already contributing the maximum, it doesn't matter that much when you make those contributions. Making fixed monthly contributions is done mostly for budgeting reasons. Most of us can't predict fund performance well enough to optimize our contributions (by which I mean, contributing more early if you think the market is going up, but waiting if you think it will go down, following the "buy low" strategy).

As for employer matching, check with your company to see how they compute matches. They may match contributions for the year, even if those matching funds are only paid up to a maximum per paycheck. (For example, if you contribute 200% of the match for the first 6 months, then contribute nothing for the remaining 6 months, you may still receive the same matching funds per pay period as if you were contributing 100% throughout the year.)


Keep in mind one possible gotcha on depositing a bonus into your 401K: Tax withholding. Depending on whether your employer combines your bonus onto a regular paycheck, you can be bitten if you allocate a large chunk to your 401K.

I suspect your bonus is, like most, subject to an arbitrary federal withholding requirement of 25%, and if you allocate 100% of the bonus to your 401K, the 25% withholding may come out of what would ordinarily be the take-home in your "regular" paycheck - leaving you with a literal take-home of zero for one pay period.

There are lots of variables in that calculation, obviously, but it's one a lot of people seem to overlook.

  • In my experience, 401k contributions are typically limited to 75%, probably for this very reason. Also, if the OP is contributing to a traditional 401k, it seems to me that those funds wouldn't be subject to tax withholding. – Daniel Dec 27 '18 at 14:35

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