1. What are you missing out on?
It could be a lot. For example, up to £2.8 billion in pension credit - a benefit available to top-up a weekly pension - was not taken in the 2012/13 tax year, according to the Department for Work and Pensions.
Up to 620,000 people also failed to claim £2 billion in income support and employment and support allowance, equating to about £3,225 per person, while 3.2 million people missed out on up to £2.4 billion, £750 each, in council tax benefit.
2. Are you entitled to any benefits?
There are lots of types of benefit available for people of all ages and financial backgrounds - don’t just look for the most common ones.
For example, since April 2012, grandparents or other family members aged between 16 and state retirement age have been able to claim extra credits if they care for children under the age of 12.
3. How can you find out what you're entitled to?
Check the website turn2us.org.uk. Alternatively, you can call its free confidential advice line on 0808 802 2000.
The benefits adviser tool on the Directgov website (direct.gov.uk) will also give you a list of what you could be claiming and how to do this.
If you would prefer face-to-face advice, your local Citizens Advice Bureau can offer this - a list of local offi ces can be found at citizensadvice.org.uk or by calling 020 7833 2181.