A court has postponed until June 1 the retrial of Rural & General Insurance founder Charles Pratten over offences relating to obtaining a financial advantage by deception.

The retrial at NSW Supreme Court had been due to start on May 18.

Justice Stephen Rothman set the new date after hearing a solicitor and counsel have been retained for Mr Pratten.

Mr Pratten was convicted in June 2012 on seven charges relating to tax returns between 2003 and 2009.

He appealed the decision and last year a retrial was ordered.

The new trial could run for six weeks.