The Inl;and Revenue are human (contrary to popular belief!) and are able to see through most people's attempts to avoid paying tax. Up to a point, they will let a certain amount go, but if you take the pee, they will land on you from a great height! You must remember that anyone paying 'you' will be trying to avoid paying their tax, and may well declare their payment to 'you' on their tax return. The IR are pretty sharp at threading these transactions together, and if they think it is wholesale fraud, the put a specialist on your case, and you are in big trouble. Honesty really is best - you can't beat the system for ever, and if they start delving into 'your' murky past ...