It should be automatically stop if you are working for the same company during the year when the limit is reached, but if you went to work for a different company during the year you will be responsible for monitoring the limit.
There is a hard limit of $19000 + $6000 (over 50 year old catch up) + $37000 (all company match and self after-tax contribution) = $62000. Once you reached that you can not contribute anything more, including after tax contributions (been there done that). You can contribute more if you have a second W-2 job but my guess is it won''t be pretty when it comes to tax time.
这个上限不包括公司match. after you reach the limit, it will automatically stop. And the company won’t match.
个人投的钱的上限, 不会不小心存超了， 到了就存不进了。
那个是pre-tax的上限，存满了就会自动停。
超了也可以存，就是扣过税了，cap和penalty看州
There is a hard limit of $19000 + $6000 (over 50 year old catch up) + $37000 (all company match and self after-tax contribution) = $62000. Once you reached that you can not contribute anything more, including after tax contributions (been there done that).
You can contribute more if you have a second W-2 job but my guess is it won''t be pretty when it comes to tax time.
19k是你自己的上限。
如果换工作，加起来自己贡献的超过上限会罚，还很麻烦。换工作一定要小心，最好在第一张paycheck到来之前，把已经withhold的数量告知新公司，或者先withhold 0，等数据更新了再改。
That's not accurate. Some companies do allow employees to contribute after-tax (potentially roll out as back door roth) after you reach 19K. YMMV
这个1万9是个人的上限，超过了也会继续存的，只是年底你交税表的时候得为这个多余的部分交税，会变成的情况是你交了税，但是钱变成了税前的钱。所以最后还是得你自己看着了。