Some 401k plans will allow you to borrow from them. Loans are not taxable as long as u repay them within the terms of the original loan. Contact the record keeper of your 401k and simply ask, most can be processed thru the website.

If you take out a loan you will not owe taxes now. If you pay back the loan you will never owe taxes on the transaction.

If you do not pay it back you will probably owe taxes but not always and not until later.

However, you should talk to the administrator of your 401k plan before you spend more time contemplating your decision. Your options are going to vary dependent on the rules set up by your plan. And if the money is from a previous employee it unlikely a loan will be an option. Also know that what you need the money for can affect both the tax penalties as well as what your plan options are.

under two circumstances, yes; to purchase a house; to repair storm damage.

yes, you can take loans from your 401 K but if you do not repay it, you will be taxed on it