Arizona's tax collection agency said it's getting solid results from efforts to stop fraudulent state income tax refunds from being paid out.

The Department of Revenue said it stopped more than $31.8 million in fraudulent refunds in the fiscal year that ended June 30. That's up from over $22 million in the previous fiscal year.

Assistant Director Anthony Forschino attributed the increase to enhancements to the department's computer programs and to the addition of auditors and investigations.

The department said the fraudulent refunds are sought when individuals use stolen or fictitious taxpayer information to file false income tax returns.