I've received a letter from the Inland Revenue (the UK equivalent of what I think you guys in the USA call the IRS). It's a demand for 3 pence (i.e. about 5 cents) - and no, I haven't misread the letter. How should I pay it? Cheque (sorry, 'check')? Send coins taped to a piece of card? Whatever, it's still going to have cost way more to process this than the size of the tax demand.