I have moderately complex tax affairs here in the UK. Each year it takes about an hour.<p>I log on to the Revenue and Customs website, it asks me some basic questions about what I'd like to declare and then optimises the sections of the 'form' I need to fill in. So for example I don't need to declare any offshore assets so I never see that section of the form.<p>At the end it presents me with the entire form which I can download as a PDF for personal filing. I declare it to be true by clicking a check box and I send a cheque to the government (or in a bad year they send me a cheque).<p>It's all SO easy. They have a great phone line with people who answer questions honestly.<p>The only caveat being that you should do it well before the January deadline for personal tax as the website gets a bit slow in January.