This piece is fully updated with the revised voter registration deadline.
Registering to vote is quick, simple, and best of all you can do it right now.
And you should. The deadline for registering to vote ahead of the EU poll is midnight on THURSDAY 9 JUNE.
So if you're aged 18 and over, even if you haven't voted before, now is the time to register to cast your vote in June.
How do I register to vote?
The EU referendum takes place across the UK on Thursday 23 June 2016, but to have your say, you need to register to vote by midnight, Tuesday 7 June.
In England, Scotland or Wales, you can register to vote online at gov.uk/register-to-vote.
Registering takes around 5 minutes.
In Northern Ireland things take longer, visit the Electoral Commission's website here.
How do I check if I'm registered to vote?
Every council holds the electoral register for their own area but there is no online electoral roll.
To check if you are registered to vote, you will need to contact your local electoral registration office.
Search contact details for your local electoral registration office, by entering your postcode in the Electoral Commission's website here.
Yet this may not be possible ahead of Monday's deadline - and the advice is: if in doubt, just register.
An Electoral Commission spokesperson told The Huffington Post UK: "Over the weekend, the best thing to do is to just register.
"It only takes a few minutes so you might as well.
"The way the new system works is that duplicates will be deleted by the local authority, so while it's not preferred, if in doubt, just register."
Registering to vote when you're renting
One of the group of voters most likely to be disenfranchised are private renters, according to research.
According to the Electoral Commission, private renters are far less likely to be registered than other groups.
Some 87% of homeowners are registered - only 56% of private renters are.
By some measures, private renters may also be more inclined to swing between parties. This means they're likely to hold the balance of power.
Despite living at an address on a temporary basis, private renters are still eligible to vote at that address.
Registering is quick and easy too. In England, Scotland or Wales, you can register to vote online at gov.uk/register-to-vote.
Registering to vote in the EU referendum
Whether you support Brexit or not, voting in the EU referendum takes place on Thursday 23 June 2016.
The deadline for registering to vote in the European Union referendum is June 9 2016.
If you've registered to vote for upcoming May elections, the chances are you will be registered to vote in June.
But if you move home in the meantime - or return home from university - you may wish to register again at your permanent address.
As there's more time before the deadline, make sure you give your local authority a call before re-registering as you may not need to.
The biggest concern is that young people especially may be unable to cast their votes at a ballot box.
"There is an absentee ballot and also the postal ballot, and we're encouraging young people to sign up to these ahead of June," the Electoral Commission said.
Search contact details for your local electoral registration office, by entering your postcode in the Electoral Commission's website here.
As yet there is no word on changes to postal vote deadlines. Previous advice was that you could apply for a postal vote by Wednesday 8th June.
Applications must reach your local authority voting office by this date.
You can download an application form here and send this in the post.