According to figures published by the City of York Council, it investigated over 188 cases of potential fraud against the authority during the last financial year.
The vast majority of these involved bogus attempts to claim Council Tax reductions. 13 involved attempted social housing frauds.
Of the 188 cases investigated, fraud was confirmed in 109 cases.
The potential loss of income to the authority was £255,185 pa.
The Council employs 13 anti fraud staff at a cost of around £270,000 pa.