Landlords are complaining about banks calling in loans from one property when another is sold.
Andrew King, executive director of the NZ Property Investors Federation, and Auckland Investors Association immediate past president David Whitburn said there were issues in their sector.
Banking Ombudsman Deb Battell warned that people wanting to sell one property to release capital should first be clear how much money their bank would let them keep.
She released a statement saying that following complaints from people who found their bank didn't let them keep what they expected to clear from the sale of one property, she had issued a quick guide on selling property to release capital.
"If a customer sells a property which is security for a loan, they usually keep the proceeds after the loan is repaid. However, this may not necessarily be the case when a person has an "all-obligations" mortgage and a number of loans," she said.