<prompt> Human: Hey guys! Nooby redditor here. I need some guidance.Im a person who doesnt spend much and manages to save money. This means that Ive had a few friends over the years ask me for minor loans. I love being able to help my friends so Ive never said no without reason. Recently though, I lent bigger sums to three different people, were talking about 2000-3000. We did agree on a payment plan in which Id recover the money in less than a year, all good. The problem comes when I recently started to properly invest my money and see returns, making me wish I had some extra savings to invest and increase my portfolio. Needles to say, that extra money is tied up in my friends.My question: is it wrong for me to change our agreement and ask them for interest? If so, how much is a reasonable amount?  <response>: If you want to charge interest on future loans then you can make that a part of the loan agreement, but as for outstanding loans you should leave them as they are. 