Changes to employment law are afoot as a National Party Member's Bill amending personal grievance provisions, has made it through its first reading in Parliament.

Coromandel MP Scott Simpson's Bill would allow people on salaries of more than $150,000 a year to contract out of personal grievance provisions in the Employment Relations Act.

He said even Labour leader Andrew Little has spoken supportively of it.

"It was the sort of thing that a Labour-led Government would be keen to look at, especially for chief executives."

But any support Labour might have once had for it, appears gone, with Labour MP Iain Lees-Galloway calling the Bill a dog.

"It is incredibly ill-conceived, poorly thought through, and very poorly drafted."