The Morrison government potentially needs just one more Senate vote to delay the rise in compulsory superannuation contributions, after two crucial crossbench senators expressed concern that increasing the rate to 12 per cent of wages would hurt the economic recovery from the COVID-19 recession.

The government said on Monday the negative impact on take-home pay from higher super and politics would influence its yet-to-be-made decision on whether to proceed with the legislated rise from 9.5 per cent.