Businesses who pay by instalment plans
Interest will apply to all instalment plans setup after 1 April 2026. This is to improve fairness for levy payers who pay their invoice in full and on time.
If you have an instalment plan currently in place, details on how to opt-out of your rollover instalment plan will be included on your invoice.
What you need to know
- Calculating the interest
Each instalment will include interest, calculated using a formula based on the floating first mortgage housing rate and a use-of-money adjustment. This adjustment reflects the cost to ACC of not receiving full payment upfront. Longer plans will incur more interest. This is called ‘instalment interest’. - Interest on late payments
The interest rate for late payments (not in an instalment plan) will also change. It’ll use a similar formula instead of the current flat 1% rate, which we’ll call ‘late payment interest’.
To avoid higher interest charges, arrange payment or set up an instalment plan before your invoice is overdue. The late payment interest rate is higher than the instalment interest rate. Interest rates will be published in April 2026, to ensure we’re using the most up-to-date rates that reflect the wider economy.
How and when interest is charged
Last published: 8 December 2025