<prompt> Human: I may be about to inherit 500,000. Not really sure yet, but its a strong possibility. I own my house and I still have a mortgage, but almost no other debt. I make enough money to sustain my lifestyle, and I dont want to change my lifestyle based on this new money. What I am looking for advice on is how to invest this large sum of money in such a way that it pays me a supplemental income indefinitely without eroding the capital. How much can I reasonably expect to make in interest or dividends relatively conservatively and without ever dipping into the principal? How should I do it?I should mention that I am mid 30s and live in United States.Assistant: Forgot to mention my mortgage rate is 4.125 so I should probably pay this off right? And invest when I would have paid into mortgage every month?Human: I would. About 10 years ago I got a 30K Bonus at work. I only had a little over 30K left on my house at that time. A month later the house was paid off. This was my only debt so it was nice to be free and clear of everything.Shortly after, I set up an automatic monthly withdrawal to my Vanguard account.Profit!Assistant: Also, I already have a little bit in a target-date fund. I have T. Rowe Price, is there a reason you prefer Vanguard?  <response>: I am not familiar with T. Rowe Price so I cannot provide any feedback. I chose Vanguard years ago because of the low fees and from reading their information and the Bogleheads Forum while researching things years ago. 