Insurance stamp duty revenues in NSW are expected to grow at an average rate of 5.7% to $945 million in the next financial year, according to budget papers.

They are projected to continue rising at an average rate of 5.1% to $1.09 billion by 2017/18.

In 2014/15 “other revenue” – grouped under the same category as fines, regulatory fees and licences – is expected to increase by $419 million, or 29.5%, primarily due to one-off transactions.

The rise includes higher-than-expected recoveries from HIH Insurance liquidators on behalf of the Building Insurers Guarantee Corporation.

By 2017/18 other revenue is forecast to have fallen by an average rate of 3.2% per year.