In Budget 2010, $120 million was allocated for exposing tax non-compliance and another $78.4 million was tagged in Budget 2012.
"Our opponents claim that we are obsessed with welfare fraud while do nothing about tax dodging, however, this couldn't be further from the truth," Mr McClay said.
"Spending on Welfare Fraud has remained at exactly the same level as it was under the last Government, around $35 million a year, yet the management of debt and outstanding returns by IRD has gone up from $88 million to $125 million in Budget 2013."
Overall last year, Inland Revenue collected around $4 billion worth of debt and outstanding returns, Mr McClay said.
He encouraged those struggling to meet their tax obligations to contact Inland Revenue and work out a repayment plan.
"It is easier for taxpayers if they comply on time than have Inland Revenue chase them up later."
Labour and the Greens have previously criticised the Government saying too much time was spent "beneficiary bashing" instead of focusing on tax cheats.