Dole recipients who are selected to take part in the Coalition's welfare drug test trial but refuse to take a drug test will have their payments cancelled, the Morrison government says.

The Coalition introduced its bill to trial drug tests for welfare recipients to Parliament on Wednesday, arguing substance abuse is "not consistent with community expectations about receiving taxpayer-funded welfare payments".

Social Services Minister Anne Ruston has stressed that people who fail the tests will not have their payments cut, but those who refuse a test will. Credit:AAP

Social Services Minister Anne Ruston has stressed that people who fail the tests will not have their payments cut but rather be put on income management, which would see 80 per cent of their welfare payment not accessible in cash.

"Not one cent will be taken from their welfare payments if they're identified or test positive to either the first test or the second test," Senator Ruston told ABC Radio on Wednesday.