You could do that but there is no fee now so it's pointless and could lead to major arguments and problems. It's income and counted just the same as any other income. If you're earning any money through PRS or other music work, you should declare it as taxable income. Though if it's Â£20 a year the taxman won't really be bothered. If it's something substantial you need to declare it or risk the wrath of the Inland Revenue.