Small business tax break to be extended

It's expected the federal government will extend its instant asset write-off for small business when the budget is handed down on Tuesday night.

Small businesses are expected to win an extension of a tax break which allows them to claim an instant tax deduction for purchases worth up to $20,000.

The instant asset write-off was due to expire on June 30, but could be extended for at least a year in Tuesday night's federal budget.

"Small business can be assured that they'll continue to have our support," Treasurer Scott Morrison told The Australian.