The LVRs mean most home buyers need at least a 20 per cent deposit to get a mortgage. Since October last year, those buying investment properties have needed 40 per cent deposits.
Robertson believed the Reserve Bank would look at the effect Labour's plans to extend the 'bright line' test from two to five years would have on demand, as well as Labour's plans to boost housing supply over time through KiwiBuild.
"The issue is that they take a little bit of time to come on stream."
National's finance spokesman Steven Joyce said he had asked the Bank to start signalling how they would unwind LVRs in the middle of the year when he was Finance Minister. "But ultimately it's over to them when they do that."
"I think it is important that the Bank starts to signal under what conditions it would ease off the LVRs. There's no doubt Auckland and Christchurch housing prices are now flat, but they will obviously be wanting to think about whether that will continue or not."
Robertson will deliver his first major speech as Finance Minister on Friday and said that would focus on the Government's economic strategy and its 'high-level' goals for the economy.
Joyce said it was past time the Labour-led Government started to set out its "fiscal ambitions" and he hoped the speech would deliver that.