The banking ombudsman is warning people to be wary of what they commit to when it comes to guaranteeing someone else's borrowing.
Deborah Battell said new limits for low deposit home lending had sparked suggestions of an increase in people becoming guarantors for home buyers.
Battell said her office encountered a low but consistent level of disputes around guarantees and a common problem was that people were often not fully aware of the financial impacts if the borrower wasn't able to make payments.
"More often than not, a guarantee arrangement can work well, and is a useful financial tool. But our experience dealing with guarantee complaints and disputes is complainants may not have been fully aware of the negative impact a guarantee can have on their own finances in the event the person whose lending they agree to guarantee gets into financial strife.
"Unfortunately, ignorance is not a defence and we have seen guarantors find themselves in dire financial straits themselves, which is all the more distressing given their good intentions."