Martin Lewis has issued a key piece of advice to anyone who has moved homes since 1993, which could help them claim back some money.
The money saving expert, 52, revealed if you've moved house in the last 31 years, especially to a different council area, you could be owed cash in overpaid council tax.
A post on the Manchester-born money guru's website revealed 800,000 households may be eligible for a council tax refund worth hundreds of pounds without even knowing it.
According to data gathered from Freedom of Information requests a whopping £141 million is owed to people across 349 local authority areas in England, Scotland and Wales.
Council Tax is used to pay for vital local services like schools, rubbish and recycling collections,repairs to parks and leisure facilities.
However the price we pay annually is based on the price your property would have sold for on the open market on 1 April 1991 in England - or 2003 for Wales.
This banding system is often criticised for being outdated, as the value of properties remains based on an assessment carried out in 1991.
These values have changed dramatically in recent years, with some areas seeing massive spikes in property value, and others seeing drops.
Martin Lewis had issued an urgent warning to anyone who has moved home since 1993
The post read: 'Essentially, a Council Tax account will be in credit if you've paid more than you owe at any point.
'Normally, this isn't a problem – in fact, as Council Tax is usually paid in advance, you'll often be in credit.
'However, when an account is closed while in credit – which can happen if you move to another area, for example – this can be an issue.'
The post went onto explain how you can check if you are owed any money and how to claim it back.
It claimed the simplest way to do this is to see if your council area has an online form called: 'Council Tax refund form.'
If you are owed money then you won't have to do anything else as this should be refunded automatically.
However if your council doesn't have an online form, the post recommended emailing them or calling them to ask directly.
It comes afterMartin issued an urgent warning to motorists to check their driving licence, alerting them to a potential £1,000 fine.
He has warned drivers across the UK that they could be in for an unpleasant shock if they are discovered driving with an out-of-date licence.
According to data from the Driver and Vehicle Licensing Agency (DVLA), 2.3 million people across the UK will see their licences expire this year - though many might not realise.
The money saving expert, 52, revealed if you've moved house in the last 31 years, especially to a different council area, you could be owed a lot of money
Writing on the Money Saving Expert website, advisors warned that the repercussions for being caught without a valid licence could be as expensive as they are inconvenient.
Those caught driving without an in-date licence could even face fines of £1,000.
Martin urged all licence holders to do one simple thing to avoid having the shell out - check the expiry date.
As of 1998, photocard licences have been in place across the UK. Paper driving licences issued before 31 March 2000 are still valid.
But cards given to drivers are only valid for ten years at a time and must be renewed after this period.
The date is given on the front of the plastic card and can be found under section 4B.
If drivers are due an update, they can easily do so by going onto the DVLA website and ordering a new version.
Renewing a driving licence costs either £14 online or £17 via post and will require an updated passport or alternative form of legal identification.
For those applying by post, forms known as D1 papers are available from most UK post offices or can be obtained from the DVLA website.
Drivers can also get their licence updated at the post office, though this requires an additional charge of £4.50 to take a photo on top of the initial £17 fee.
Those over 70 will need to renew their licence every three years instead of every 10 - though this can be done for free.
The same also applies to people who have a short-term medical licence.
Writing on the Money Saving Expert website, advisors said people can still drive if their licence is out of date, so long as they are in the process of getting it renewed.
'The DVLA says if your licence expires while it is processing your renewal application, you should be able to continue driving as long as you meet certain conditions,' it states.
These include ‘only driving vehicles you were entitled to drive on your previous licence, not being told by a doctor or optician that you shouldn’t drive, and you aren’t disqualified from driving.’
If someone has applied for a medical licence, they must ensure they are fulfilling all the criteria to qualify.
'If you’re waiting for a medical driving licence – in other words, you have declared a medical condition to the DVLA – you must make sure you meet the medical standards for fitness to drive before doing so,' they explained.
As well as making sure to check the expiry date, Martin alerted drivers to the address section of their licence, urging them to ensure it's correct to avoid getting a fine.
This process is simple and only requires people to go on the DVLA website where they can receive an updated licence for free.
It's good news for regular movers as the number of times a licence holder can change their address is unlimited.
To change the address of a driving licence is also free.
Finally, people will need to ensure their first and surname is correct, along with their correct gender.
Again, this can easily be rectified by ordering a D1 application for for a driving licence via the Gov.uk website and making the necessary changes.
This will then need to be posted to the DVLA alongside the appropriate documents. Fortunately, there is no cap on the number of times this can be done.
