The management had previously conceded that the company was trading in the red in 2009 but this is the first time the extent of those losses have been made public.
The pre-tax loss was, however, a 27% reduction on the £6.2m it lost the previous year. Turnover was also down from £76.1m to £67.5m as it closed unprofitable stores.
Earlier this year, Oddbins said it had enjoyed its best sales for six years in early 2010 and that it aimed to return to profit before the year end. But the accounts revealed the third quarter of 2010 had been "subdued" as a result of weakened consumer confidence.
"We believe we have the business well set to profit from the potential upturn in the economy through 2011 and beyond," it said in a statement.