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How do you declare an interest free loan?
I am neither a lawyer nor a tax accountant, and if you're dealing with serious money I suggest you consult a professional. But my understanding is: If you make a loan at zero interest or at below-market rates, the IRS will consider the difference between the interest that you do charge and the market rate to be a gift. That is, if someone could get a loan from a bank and he'd pay $1000 in interest for the year, but instead you loan him the money as a friend interest free, than as far as the IRS is concerned you have given him a $1000 gift, and you could potentially have to pay gift tax. Or they might "impute" the interest to you and tax you on $1000 of additional income. If you have no agreement on repayment terms, if it's all, "Hey Joe, just pay me back when you can", then the IRS is likely to consider the entire "loan" to be a gift. There's an annual exclusion on gifts -- I think it's now $13,000 -- so if you loan your buddy fifty bucks to tide him over until next pay day, the IRS isn't going to get involved in that. They're worried about more serious money. And yes, the IRS does "police loan rates". The IRS examines exact numbers for all sorts of things. If, say, you go on a 100-mile overnight business trip, and the company gives you $10,000 for travel expenses, the IRS is likely to say that this is not a tax-deductible travel expense at all but a sham to hide part of your salary from taxes. Or if you donate a pair of old socks to charity and declare a $500 charitable contribution deduction, the IRS will say that that is not a realistic value for a pair of old socks and disallow the deduction. Etc. A small discrepancy from market rates can be justified for any number of reasons. If the book value of a used car is $5000 and you sell it to your neighbor for $4900, the IRS is unlikely to question it, there are any number of legitimate business reasons why you had to give a discount to make the sale. But if you sell it to him for $50, they may declare that this is not a sale but a gift. Etc.