In some cases, you may not get the full match until the end of the year.

Your company offers a 1:1 match to your contributions, up to 5% of your gross salary.

Assuming 26 paychecks in a year, your pre-tax pay is $4000.

You would hit the $18000 limit on paycheck 18, having earned a match of $3600.

LPT: Dont max your yearly 401k contribution early when your company offers a 401k match.| Reddit

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