James Stevenson, a lead analyst programmer at Sainsbury's, has admitted stealing more than £73,000 in Nectar reward points from Sainsbury's.
Stevenson created and credited false accounts with around 14 million Nectar points, which have a monetary value of £73,207. In order to gain this amount he would have had to spend £7m at the supermarket.
He also admitted fraud by false represention for redeeming £8,120 of the points for shopping, on October 9, 2007.
Judge Peter Thornton has released Stevenson on bail over Christmas, but said he is likely to be jailed after sentencing on 14 January, reported the Daily Mail.
Stevenson stole the points between 17 November 2002 and 24 May 2003.