Young people Sector overviews Accounting AccountingFrom schools to banks, every organisation must keep their finances in order and their “books” balanced. Fundamentally, it’s an accountant’s job to ensure that the money going in and out of an organisation adds up. They provide the information and reports that companies use to hold themselves to account. The world’s biggest accountancy firms are based in London and several of these are the only firms capable of auditing large international businesses in the UK.Top facts The Big 4 – that's Deloitte, KPMG, PwC and EY. These are the four largest accountancy firms in the world and they all have their headquarters in London. 29% of vacancies in accounting and professional services are likely to be filled by graduates who have already worked for the employer. £30,300 – The median graduate starting salary in the accounting and professional services sector. Read about the technology sector.