NZ Wool Services said a provision for impairment of receivables came to $6.1m compared $1.21m in 2018.
A note to the accounts says the figure related to an interest bearing loan to a related party.
Loans from related parties came to $31.1m in 2018 from $39.5m a year earlier.
The company maintains a strong balance sheet with shareholder funds of over $43.6m.
Ownership of NZ Wool Services - the country's largest wool exporter - changed hands in 2016 after its parent in Australia - Lempriere - was taken over by a Shandong RuYi.
NZ Wool Services, which has a wool scouring joint venture with NZX-listed Cavalier, was originally established as a subsidiary of the New Zealand Wool Board in 1991 to market New Zealand wool worldwide.
It was acquired by Lempriere, one of the world's largest wool merchants and processors, in 2013.
In 2016, Lempriere was taken over by its then half owner, Shandong RuYi.
In April 2016, Shandong Ruyi bought a controlling stake in French fashion firm SMCP for €1.3 billion in one of the largest overseas acquisition deals in China's fashion industry.
After the acquisition, SMCP stepped up its global expansion plans, especially in China's e-commerce sector.