A new survey report has found only one in three families have benefited from reduced childcare costs since a major overhaul was introduced in July last year.

Education Minister Dan Tehan said there is no doubt that the majority of families are better off, but Head of Advocacy at Goodstart says said had spiked in some rural and regional areas.

The new child care subsidies were designed so parents can find more daywork, but only one in four parents surveyed said their workload had changed.