11/06/2026
7 Reasons Why People Get Surprise IRD Tax Bills in NZ, and How You Can Avoid Them
By Baqir Hussain, FCCA
Nobody likes getting a surprise tax bill from IRD.
One day everything feels fine. Then suddenly there is an email, a letter, or a notification in myIR saying you owe thousands in tax you were not expecting.
And the frustrating part?
In many cases, the tax bill was completely predictable.
The worst part is many people only discover the problem when it is already too late to properly plan for it. By then, the money has often already been spent, cashflow becomes tight, and the stress starts building.
Over the years, I’ve seen the same patterns repeat again and again. Salary earners, contractors, business owners, investors, and rental property owners often assume their tax is “sorted”, until they discover it is not.
Most people I’ve worked with do not intentionally get their tax wrong.
Usually they simply misunderstand how the system works.
Unfortunately, IRD does not care whether the bill shocked you or not.
The tax is still due.
The good news is most surprise tax bills are avoidable with better planning, better systems, and earlier advice. If you are unsure whether you are heading toward a surprise IRD tax bill, getting clarity early can save a lot of stress later.
Below are the 7 most common reasons for getting a tax bill. If you'd like to learn on how you can avoid them, real the full article from the link in the comments.
1. Having Multiple Sources of Income
2. Using the Wrong Tax Code
3. Working for Families Overpayments
4. The ‘Mum-and-Dad’ Property Investor Surprise
5. Not Putting Tax Aside During the Year
6. GST Confusion
7. The Provisional Tax Shock
In my full article, I go in-depth and cover:
- These 7 reasons in detail
- How you can avoid making the same mistakes
- How to respond if you already have a surprise tax bill
Link in comments.