Based on the screenshot that you took, I think that it is possible that there is a misunderstanding here of what your options are and the tax implications.
There is a difference in tax between contributing via payroll deduction through your employer, and contributing outside of payroll deduction. The differences are in the payroll (FICA) tax, as well as the method of how the contribution gets deducted for income tax purposes. In order to get the payroll tax deduction, the contribution needs to be sent in by your employer.
Looking at your screenshot, it appears to me that you are looking at Fidelity's website, and that this is not part of your employer's payroll system. Your two options are listed as:
- Link a bank account to transfer funds and set up recurring deposits.
- Have money from each paycheck deposit automatically into your new account.
The second option sounds like payroll deduction, but if Fidelity is simply transferring money from one of your accounts to another everytime a paycheck is deposited, and these deposits do not appear on the paystub that you get from your employer, then you would still be paying payroll tax on that money. If you want to contribute via payroll deduction and avoid the payroll tax on your contributions, you need to talk to your employer and ask them how to set it up.