Rule out capital gains tax changes: Abbott

Former prime minister Tony Abbott is urging the Turnbull government to rule out changing capital gains tax in next month's budget.

Mr Abbott is again offering advice to his successor and his front bench team, saying he would be dismayed if the budget contained overt or covert tax increases.

"It's good that the treasurer has ruled out changes to negative gearing but he should rule out changing capital gains tax and resource rent tax too because we shouldn't be in the business of punishing people who have a go," he told News Corp on Wednesday.