How we apply interest on levies

Paying by instalments

You can spread your levy payments over 3, 6, or 10 months using a direct debit instalment plan. 

Use the instalment interest estimator to see what an instalment plan could cost. 

How instalment interest works  

• All instalment plans use the same annualised interest rate, making it easy to compare finance options and decide whether an instalment plan is right for you. We show this rate on your levy invoice or instalment plan confirmation.
• We also provide instalment interest rates on this page, which tells you the percentage of your levy you’ll pay in interest over the life of the plan.
• Longer plans mean you’ll pay more interest overall.  
• The rate applied is the rate in effect on the date we approved your instalment plan. It stays the same for the full plan.  

Annualised interest rate 

The annualised interest rate has two parts: 

• Base rate: reviewed each April and set using the most recently reported monthly floating first mortgage rate for new customers, as published by the Reserve Bank of New Zealand.
• Use-of-money adjustment: a fixed 2.5%.  

Annualised interest rates were introduced in 2026. Before this, only instalment interest rates were used. 

Paying late

If you don’t pay your levy or instalment by the due date, late payment interest applies. 

• The rate is the annualised interest rate, converted to a monthly rate, plus 1%, and compounds monthly. 
• Late payment interest includes instalment interest on missed instalments 
• It doesn’t apply if you’re making the agreed payments 
• Unpaid debts may be referred to an external collection agency.  

Late payment interest rates 

If you have any questions about late payment interest, email or phone us Monday to Friday, 8am to 6pm.  

Email collections@acc.co.nz 
Phone 0800 729 538 or 04 805 4296

Overpaid levies (credit interest)

If your provisional levies are $1,000 or more above your final levy, you may earn credit interest. 

• Self-employed people and private domestic workers don’t pay provisional levies, so they’re not eligible 
• From 2025, the rate is set each year using the Reserve Bank of New Zealand’s 90–day bank bill yield rate, less 1%.  

Credit interest rates

Credit interest rates are set under the Accident Compensation (Work Account Levies) Regulations 2025.