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Borrow from 401k for down payment on rental property?
Another option you might consider is rolling over some of that 401K balance into a self-directed IRA or Solo 401K, specifically one with "checkbook privileges". That would permit you to invest directly in a property via your IRA/401K money without it being a loan, and preserving the tax benefits. (You may not be able to roll over from your current employer's 401K while still employed.)  That said, regarding your argument that your loan is "paying interest to yourself", while that is technically true, that neglects the opportunity cost -- that money could potentially be earning a much higher (and tax-free) return if it remains in the 401K account than if you take it out and slowly repay it at a modest interest rate. Real Estate can be a great way to diversify, build wealth, and generate income, but a company match and tax-free growth via an employee sponsored retirement account can be a pretty sweet deal too (I actually recently wrote about comparing returns from having a tenant pay your mortgage on a rental property vs. saving in a retirement account on my blog -- in short, tax-free stock-market level returns are pretty compelling, even when someone else is paying your mortage). Before taking rather big steps like borrowing from a 401K or buying a rental property, you might also explore other ways to gain some experience with real estate investing, such as the new crop of REITs open to all investors under SEC Reg A+, some with minimums of $500 or less. In my own experience, there are two main camps of real estate investors: (1) those that love the diversification and income, but have zero interest in active management, and (2) those that really enjoy real estate as a lifestyle and avocation, happy to deal with tenant screening and contractors, etc. You'll want to be careful to be sure which camp you're in before signing on to active investment in a specific property.