NBN early termination fees — what's legal and how to challenge one.

Why this happens

• Many ISPs calculate exit fees as remaining months × monthly price — the full retail revenue they'd lose, not their actual cost
• Under Australian Consumer Law, early termination fees must reflect a genuine reasonable cost to the provider, not a penalty
• The ACCC monitors telecommunications contracts for compliance with this principle
• The ISP's actual margin loss on remaining months is far lower than the full contract value they typically quote

How to fix it — step by step

1. 1. Get the exit fee amount in writing

   Ask your ISP to confirm the exact early termination fee in writing, including how it was calculated. An ISP that can't or won't explain the calculation is a warning sign.

2. 2. Understand what a legitimate ETF looks like

   Under Australian Consumer Law, an ETF must reflect the provider's genuine reasonable cost of the early termination — not the full remaining contract value. The ISP's actual loss is their margin on the remaining months, not the full retail price. Those are very different numbers.

3. 3. Compare the fee to the ISP's genuine cost

   If an ISP makes roughly $20 per month in margin on your service, and you're leaving 6 months early, their genuine loss is around $120. If they're quoting you $300–400, that exceeds a genuine cost estimate and may not be enforceable under ACL.

4. 4. Challenge the fee in writing

   Write to your ISP: 'Under Australian Consumer Law, early termination fees must reflect a genuine reasonable cost to the provider. Please provide an itemised breakdown showing how this fee was calculated.' Many ISPs will reduce or waive a disputed ETF rather than defend the calculation.

5. 5. Escalate to the TIO if unresolved

   If your ISP won't justify or reduce the fee within 15 business days of a formal complaint, lodge with the Telecommunications Industry Ombudsman at tio.com.au. The TIO process is free and most complaints resolve at conciliation.

6. 6. Report systemic overcharging to the ACCC

   If you believe your ISP is routinely charging punitive ETFs across many customers, report it to the ACCC at accc.gov.au. The ACCC monitors telecommunications contracts specifically for compliance with ACL's prohibition on penalty clauses.