Tasmanian job vacancies posted online and recorded for a federal department's internet vacancy index increased by 30.5 per cent for professionals in the year to August, in trend terms.

They increased by 25.2 per cent for community and personal services workers, most likely influenced by the roll-out of the National Disability Insurance Scheme.

The NDIS was expected to create many jobs in Tasmania.

Family Based Care Tasmania chief executive Doug Doherty said the community care workforce was the nation's oldest, on average, and also the fastest growing.

"So there are those two friction points converging," Burnie-based Mr Doherty said.

"Demand is increasing, both on the aged care side of the ledger and on the National Disability Insurance Scheme side of the ledger."

He expected NDIS demand to stabilise once the scheme was fully rolled out, but aged care-related demand would continue to grow, especially in Tasmania with its older population.

"Our projections are in the next 12 months we need 30 new employees, which would take us up to 300, to meet the projected demand," Mr Doherty said.

The extra jobs would predominantly be in the North-West.

Mr Doherty said the sector was competing with agriculture, tourism and hospitality for the same pool of workers.

With the expected wave of retirements from the sector in the next 15 years or so, he said it would be a good industry for new workers to move up the ranks relatively quickly.

There was also strong annual growth in Tasmanian demand for machinery operators and drivers (10.5 per cent).

Total vacancies increased by 11.3 per cent, including a 1.1 per cent increase in August alone.

Only the ACT had stronger annual growth and Tasmania's August growth was the nation's strongest.

"These strong results are in stark contrast to declining vacancies nationally," state Treasurer Peter Gutwein said.

"Tasmania is home to the nation's most confident businesses, and when businesses are confident they invest and create jobs."

The news was not all good for Tasmanian jobseekers.

Vacancies for sales workers fell by 13.5 per cent in the year to August.

Vacancies for labourers declined by 5.4 per cent and for managers by 3.9 per cent.

Demand for technicians and trades workers increased by 0.2 per cent, and vacancies for clerical and administrative services workers increased by 0.5 per cent.

The most vacancies in August were for professionals (30.3 per cent), followed by technicians and tradies (14.2 per cent), clerical and administrative services workers (13.2 per cent) and community and personal services workers (12.1 per cent).

Vacancies declined by 6 per cent nationally in the year to August, and edged back by 0.1 per cent in August.