With the benefits system requiring a bigger budget than almost any other area of government, reform is key to plans to cut the UK's deficit. The government is considering replacing dozens of benefits and tax credits paid to those out of work or on low wages with a single payment or "universal credit".
Prime Minister David Cameron says only the state pension would definitely be protected, so of the remaining working-age benefits currently being paid, which are the 10 most costly? The BBC has produced a very helpful guide to understanding the system.
