"We are starting to come into that stage where we're paying returns," Brock said, and confirmed the bank will look to pay dividends in the next three years.
The lender is clamping down on costs to help prepare its return on investment to NZ Post, and Brock said that's expected to strip out about 2 percent in the 2015 financial year.
"We can't just continue to drive for growth without a return overall," Brock said.
Kiwibank increased its loan book 11 percent to $14.6 billion and increased customer deposits 5.8 percent to $12.8 billion.
The lender anticipates spending a further $100 million on infrastructure in the coming four years, and NZ Post last year said the bank faced higher capital requirements due to the increased regulatory requirements and a planned upgrade of its banking systems.
The bank's parent injected $40 million of new equity in the past year, and Kiwibank raised $100 million through a capital note issue earlier this year.
Brock said he expects to fund future capital needs from increased profitability.
Kiwibank's capital notes, which pay annual interest of 6.61 percent, last traded on the NZX debt market at a yield of 6 percent, while its preference shares, which pay annual interest of 8.15 percent, last traded at $103 per $100 bundle, according to NZX data.