Was this an actual loan when you withdrew it or was this a withdraw and then you paid it back? If you received a 1099-R what is the code in box 7?
If you paid back a loan that was an actual loan, then you would not receive a 1099-R and this would not be a reportable transaction. Meaning there is nothing for you to do tax wise for this loan.
If this was a withdraw that you did in January, and then you put more money in in August, this would be considered a distribution and would be taxable, Unless you used the money for a reason that is on the exception to penalty list, you cannot avoid paying taxes on it.
If you took the money out and then put it into another 401K within 60 days, that would be considered a rollover and would not be taxable. TurboTax will guide you through the steps to show it as a Rollover on your return.
If you have a 1099-R, as you walk through the steps in TurboTax, after entering the form, you will be asked what you did with the money. In these questions, you will be given the chance to see if you can avoid paying a penalty on the withdraw.
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