There are 2 limits which you need to be aware of.
The first limit is for you, the employee. You can contribute up to $19,500 to your 401(k) in 2021. This is the total limit. So even if you have multiple jobs, $19,500 is the maximum you can contribute. You cannot contribute $39,000 ($19,500 x 2) if you have 2 jobs. The maximum still stays at $19,500
The second limit is for the the total employer and employee contributions. The total limit for 2021 for the employer and employee contributions is $58,000.
From your post, it seems like you over contributed as you stated that you contributed $19,500 with your second employer and you also did some 401k contributions with your first employer. To correct this, you will need to contact your employer or your plan administrator immediately. This way, your excess contributions are returned to you.
Additionally, if the excess amount was deferred on a pre-tax basis ( Traditional 401k), your employer must amend your W-2 Form to show the returned amount as wages. Also, any earnings you made on that excess contribution should also be returned to you and those earnings should also be included in your taxable income.
One very important thing to be aware of is that you’ll end up paying taxes twice on the amount over the limit if the 401(k) overcontribution isn’t paid back to you by April 15 so it is important that you contact your employer soon.
