"We have reviewed it, we have called for public submissions and we have listened to them, and I think the changes we are now proposing reflect the very strong feedback we received," he said.
However he did not expect everyone to be pleased with the changes.
"On something as contentious and as emotionally charged as child support, which only ever comes into people's lives when their relationship has broken down, it is not about trying to please people. It is about creating a system that people feel is fundamentally fair, and crucially, that they feel is for the benefit of their children."
Mr Dunne said the changes would be in legislation introduced to Parliament "in the next few months" but would not take effect until April 2013 and April 2014.
Labour revenue spokesman Stuart Nash said the changes were overdue.
"My one concern is that this is going to be put through later on in the year. There's only four sitting weeks left. There's no way you can can get this through the House unless it is done under urgency. What I would want from Mr Dunne is assurance this won't be rushed through under urgency before the election because I don't think that is the way to treat this legislation that affects 200,000 children."
Meanwhile, lawyer Catriona MacLennan said the proposed changes represented a swing in favour of those parents paying child support.
At present paying parents could reduce their commitment if they cared for the children 40 per cent of the time or 146 nights a year.
That meant a person on $45,000, with two children, who paid $7400 a year could drop to $2660 a year. Under the changes the threshold for reducing payments would drop to 28 per cent of nights.
"The definition of fairer is always going to be contentious ... that's going to be seen as a pretty major advantage for the paying parents," Ms MacLennan said. She was concerned that the balance was tipping away from the receiving parents.
EMOTIONAL BATTLEFIELD
$2.3b total child support debt
$605m assessed but unpaid debt included
$1.66b of unpaid penalties included