The experts agree that tax is a complex subject - and becoming more so every year. Everyone has the responsibility to complete their self-assessment tax return accurately. If the experts are confused, it's not surprising that the public is too. Here's the answer. The best-selling tax title now in its 42nd edition. It includes all the latest figures, advice and essential information, including a step-by-step guide to filling in the tax return and details of tax credits available. The Inland Revenue say that 7 million people are due a tax refund but don't know it. Check Your Tax - The Complete Guide tells you how to claim it and which forms to fill in.