Council Tax fraud is the target of a new clampdown being launched by Fylde coast councils.
Lancashire County Council is working with local authorities to tackle households falsely claiming a single person discount on their tax bill.
Homes occupied by just one person are eligible for 25 per cent off their council tax.
The county council announced it will use the latest technology to identify homes that may have undeclared people living in them.
Coun David Borrow, deputy leader of Lancashire County Council, said: “Councils are keen to make sure that people get discounts they are rightly entitled to, while clamping down on incorrect claims.
“We want to protect the public purse from fraud and abuse. We need to collect every penny of Council Tax due when councils across Lancashire are having to make millions of pounds in savings.”
Council tax fraud costs an estimated £131m a year nationally, figures show.