If you have a mortgage, making part of it a mortgage-backed overdraft (ANZ call theirs a Flexi loan) is worth looking at.

I'm in a similar situation, consulting since 2010. I pay GST and provisional tax every six months. If I've budgeted right, the balance on the Flexi loan goes to zero right before I send the massive payment to IRD in May and October.

One problem is that some banks don't like to give these accounts to sole traders. Using a mortgage broker may help get around that restriction.

If you have a mortgage, making part of it a mortgage-backed overdraft (ANZ call theirs a Flexi loan) is worth looking at.

I'm in a similar situation, consulting since 2010. I pay GST and provisional tax every six months. If I've budgeted right, the balance on the mortgage-backed overdraft loan goes to zero right before I send the massive payment to the tax department in May and October.

One problem is that some banks don't like to give these accounts to sole traders. Using a mortgage broker may help get around that restriction.