Patrick Gerard Small, 56, and Mary Elizabeth Small, 50, trading as Greystone Builders Merchants in Dungannon used undeclared offshore bank accounts in the Isle of Man and money laundered through property developments to dodge their taxes.
The pair submitted falsified trading accounts as well as personal tax and VAT returns to HM Revenue & Customs in a deliberate attempt to suppress the extent of their business profits.
Using their knowledge of the banking system the Smalls attempted to launder the profits from their criminal activities within Northern Ireland and beyond.
The Smalls built 23 houses in Northern Ireland, which remained empty, as well buying high value antiques and jewellery.
During a search of the Smalls main property HMRC officers recovered over £492,000 from safes including £447,000 from one safe alone, cash that had not been declared as income.
An HMRC spokeswoman says: “The Smalls were stealing taxpayers’ money over many years and clearly had no issue with enjoying the benefits of our public services whilst not contributing towards them.
“Even £2m stashed in offshore accounts didn’t deter them from claiming tax credits.
“Income tax and VAT fraud are not victimless fiddles and the days are long gone when hiding assets off-shore was seen as a safe bet for evading UK taxes. Anyone deliberately setting out to cheat the system by not paying the right amount of tax is taking a huge risk, as we will pursue and bring them to justice.”