A stereotypical answer to this question is that accountancy offers a respected professional qualification which can lead on to a wide range of opportunities in business. This is all true, but it doesn't answer the question of why YOU want to become an accountant - and if you give as general an answer as this, you can expect to be questioned in detail on the nature of the qualification and the opportunities you see it leading to.
Much of the income of the larger accountancy firms now comes from consultancy and related services rather than from audit. Even in audit you will spend much of your time visiting clients and asking questions, so good interpersonal skills are important. Your answer to this question should probably make this point.
Accountancy is now a fast changing profession, so they are looking for individuals with initiative who can manage change. Ensure that you have a considered answer to this question. It is bound to be asked!
