The defendant would also get clients to pay cash while getting workers to carry out the repairs which, unknown to them, were cash jobs.
The amounts alleged kept by Hayman after working on seven different vehicles varied between $275 and $2140.55. Hayman's lawyer Neal Harding, however, said he disputed part of the summary of facts which needed to be talked about and resolved before sentencing.
Hickey said the offending occurred between February 1, 2017 and July 10 this year.
In explanation, Hayman stated he was tempted by the cash and he used the money to buy beers on Fridays for the workers.
Judge Stephen Harrop said a pre-sentence report would be made and noted Hayman had a previous sentence for a burglary.
The report would consider community and home detention and restorative justice would also be explored.
"These things are very hurtful and a breach of trust," Judge Harrop said.