Individuals are missing out on money that may comfort them.
Child benefit and assistance with council tax costs are among the estimated £13 billion in benefits that go unclaimed.
According to EntitledTo, around five million people are believed to be missing out on the money.
The most common benefit that goes unclaimed is council tax relief, with over three million people missing out on £2.7 billion in total.
Local councils provide council tax assistance, which can range from a discount on your bill to paying nothing at all, depending on your circumstances.
Around half a million families are expected to be missing out on little under £1 billion in child benefit, despite the fact that some eligible families opt not to claim.
When parents earn more than £50,000, they must refund some or all of the child benefit they get.
Meanwhile, more than half a million low-income retirees are eligible for additional state pension supplements.
Unclaimed Pension Credit is worth £1.47 billion, and individuals may get thousands of pounds per year.
EntitledTo’s predictions are based on the most recent data available from the government as well as its own computations.