The Adelaide Magistrates Court has heard Australian Taxation Office (ATO) whistleblower Richard David Boyle intends to plead not guilty to 66 charges laid against him.

Key points: Richard Boyle exposed the tax office's aggressive debt collection practices to Four Corners last year

Richard Boyle exposed the tax office's aggressive debt collection practices to Four Corners last year His charges include telephone tapping without consent and making a record of protected information

His charges include telephone tapping without consent and making a record of protected information His lawyer told an Adelaide court today he intended to plead not guilty

During a brief hearing this afternoon, Mr Boyle's lawyer told the court her client would formally enter his not guilty pleas at his next hearing in eight weeks' time.

Mr Boyle became a whistleblower last year when he exposed abuse of power inside the ATO, including aggressive debt collection practices.

He was charged with a string of offences including telephone tapping without consent and making a record of protected information in January.

Mr Boyle, 43, of Edwardstown, was remanded on bail to face court again on July 30.

He faces a maximum prison sentence of 161 years if found guilty.

After receiving the charges, he and his fiancee Louise Beaston decided they could not hold off their marriage plans.

They were married in Adelaide last weekend.

Mr Boyle became an internal whistleblower in 2017 when he made a disclosure under the provisions of the Public Interest Disclosure (PID) Act 2013 to the ATO.

His allegations were investigated by a senior ATO investigator and dismissed.

He alleged that some ATO staff were instructed to use an aggressive debt collection practice known as garnishee notices, which allows the ATO to seize funds from the bank accounts of Australian taxpayers without notice or consideration of their circumstances.

The ATO offered him a settlement over an alleged breach of the Public Service Code of Conduct, offering him a payout and a statement of service, with no admission of liability, on the proviso he signed a gag order.

He declined and went public in a joint media investigation with the ABC.