I'm tutoring now, currently accepting Paypal. I feel like cash would be best (i.e. under the table). Is that a legit consideration as opposed to Paypal? With Paypal (or any online transaction thing), it is so easy. But with this sort of "paper trail", is that problematic? The other thing I'm considering (recently got into) is other forms of currency. Accepting payment via bitcoin, actual gold (bullion/coins). In these cases, I would even give a discount on my rate. Is there any legal considerations with this sort of transaction?