Banks in New Zealand will pay more than banks in Australia if they choose to sell term debt in offshore markets with the benefit of a government guarantee. Banks will also pay more for a guarantee on longer term debt.Banks will also have to maintain higher minimum capital ratios, even though in practice banks already exceed the new minimums.New Zealand's Treasury on Saturday published the details of the guarantee. Banks rated AA- and above will pay a fee of 85 basis points on paper of up to one year and a fee of 140 basis points on paper of between one and five years.For an A rated bank the fees are 145 and 200 bps. For a BBB rated bank the fees are 195 and 250 bps.