The federal government's 'no jab, no pay' law has sparked a rush on vaccines as parents fear missing out on welfare benefits.

Under the vaccination policy, which came into effect on January 1, parents will lose the Family Tax Benefit Part A supplement and childcare subsidies if their child is not up to date with their immunisations.

State and territory health departments report they are being inundated with calls from GPs and health nurses about how to implement catch-up schedules, particularly for children who have never been vaccinated, as parents flock to immunisation providers.

Meanwhile, health departments are sending out increased vaccine supplies, a spokesman for federal Health Minister Sussan Ley confirmed.