For a single person like yourself that is a maximum of $80,000 earned in the previous 12 months. Couples or people clubbing together to buy a house can earn a combined $120,000 in the past year.
Housing New Zealand will also check what it describes as "realisable assets".
These are investments like term deposits or money in bank accounts, shares, classic motorbikes or cars and expensive boats or caravans " basically things of value that can be cashed up.
Realisable assets need to be under 20 per cent of the regional house-price cap for the area you're planning to buy.
In Auckland that would mean not having more than $110,000 in realisable assets, dropping to either $70,000 or $90,000 elsewhere, depending on where you live.
Iain Duncan of Housing NZ points out those meeting the criteria for a first-home withdrawal as previous homeowners can often be eligible for the HomeStart grant that it also administers.
This can be an extra $3000-$20,000, depending on your circumstances, on top of any funds you can withdraw from your KiwiSaver account.
Many of the same rules apply to the HomeStart grant as for previous homeowners who want to re-enter the housing market. The one major difference is you need to be buying or building a relatively modest home to get the HomeStart grant.
House-price caps, which vary from region to region, dictate how much you can spend.
Unlike the salary caps, these have been adjusted since KiwiSaver was introduced to reflect booming house prices in some parts of the country.