According to the Northamptonshire Telegraph, the offence involved the purchase of £900 of tickets from East Midlands Trains using a card for a closed bank account.
The sentencing magistrate told Mr Garvie the bench "did not find his evidence credible" and that they had "no doubt he had acted dishonestly". Mr Garvie says he will appeal.
Garvie was suspended by the Labour Party, but of course this has all happened much too late for them to find a new candidate.
Mr Garvie's solution?
He told the paper:
"Unfortunately I can’t be replaced on the ballot paper. This means that for all those who have voted, I want to make sure their votes count for something. If you support Labour, vote for me on polling day and I will do the honourable thing if elected.
"I feel that this is the only way to ensure that those who have already voted have their votes heard."