The NDIS December quarterly update shows 22 per cent of participants aged above 25 were in work; a ratio unchanged over two review periods.

Seventeen per cent of Tasmanian participants aged 15 to 24 years old were in employment, compared to 12 per cent in a previous review period.

The 2019-20 target is 24 per cent.

Participants who engaged in social activities was further below the target of 47 per cent.

Just 26 per cent of participants aged between 15 to 24 years engaged in community activities and 38 per cent of those aged over 25 years.

The report showed the most significant increase of plan reviews over a quarter since March 2017.

There were 1921 plan reviews between September and December, compared to 1396 plan reviews in the previous quarter.

Just over 16 per cent of plan reviews in the December quarter were unscheduled.

This was the highest ratio of unscheduled plan reviews since March 2017.

Complaints from participants have also steadily risen over the past three years.