More than a quarter of Australia’s top 20 listed companies will not fund the superannuation increase for all employees from July 1st, but will instead deduct it from take-home pay.

The Superannuation Guarantee - compulsory superannuation paid on top of ordinary earnings - goes up from 9.5% to 10% on July 1st.

Jane Hume, the Minister for Superannuation, Financial Services and the Economy, says Australians were warned this would happen.

A spokesperson for the Fair Work Ombudsman says the legality would depend on the wording of the individual employment agreement.