Why buying land from a family building company doesn’t always trigger the 10-year builder rule

You’re a 42-year-old farmer who bought a section from your father’s building company five years ago. You intended to build your forever home, but life’s changed and now you need to sell. The property’s within that dreaded 10-year window after building.

Does IRD’s builder rule catch you?

The answer might surprise you. While you’d think buying from a family company automatically creates problems, the tax rules for land disposal are actually narrower than you’d expect.

What is Section CB 11?

Section CB 11 is IRD’s way of taxing property developers and builders on their profits. The rule says that if you sell land within 10 years of completing improvements, and either you or an “associate” was in the building business when construction started, the sale proceeds are taxable income.

On the surface, this seems straightforward. But the devil’s in the detail—particularly around that word “associate.”

Two Different Association Rules

Here’s where it gets interesting. New Zealand tax law has two different sets of association rules.

The general association rules (used for most tax purposes) cast a wide net. You’re associated with companies your family trust owns, with your father’s companies, and with businesses where your relatives have interests. It’s deliberately broad.

The land provision association rules (used specifically for CB 11 and similar land tax provisions) are much narrower. They’re designed to catch genuine property developers and builders—not just anyone with a family connection to the building industry.

Why does IRD have two different sets? Because land tax rules carry significant consequences. Parliament wanted to ensure these provisions only catch people truly in the game, not innocent family members who happen to have a builder in the family.

A Real-World Example

A recent IRD determination illustrates this perfectly.

The situation: Mr B is 42 and a beneficiary of his father’s family trust (Trust A). His father is the settlor, trustee, and has the power to appoint and remove trustees. Trust A owns 99% of ABC Limited, a building company that’s been erecting homes since 2000. Mr B’s father owns the remaining 1%.

In 2020, Mr B bought a bare section from ABC Limited with a genuine intention to build a family home. But circumstances changed. Now he needs to build and sell.

The question: Is this caught by CB 11?

Under the general association rules, Mr B is clearly associated with ABC Limited. He’s a beneficiary of the trust that owns it, and he’s the son of a shareholder.

Case closed, right? Not so fast.

How the Land Provision Association Rules Apply

For CB 11 purposes, here’s what actually matters:

Family relationships You’re only associated with relatives if you’re married, in a civil union, or in a de facto relationship with them—or if one of you is the infant child (under 18) of the other.

Mr B is 42. He’s not his father’s infant child. They’re not associated for land provision purposes.

Trust relationships You’re associated with a trust only if you’re the trustee, settlor, or have the power to appoint or remove trustees.

Mr B is just a beneficiary. That doesn’t create association under the land rules.

Company relationships You’re associated with a company if you have a voting interest of 25% or more.

Mr B owns no shares in ABC Limited. But couldn’t his father’s shares or the trust’s shares be attributed to him?

No. Attribution only happens between people who are already associated under the narrow land rules. Since Mr B isn’t associated with his father or with Trust A, nothing gets attributed to him.

The result: Because Mr B isn’t associated with ABC Limited under the land provision rules, CB 11 doesn’t apply. Even though he’s selling within 10 years of completing the building, and even though ABC Limited is a builder, Mr B isn’t caught. The sale proceeds won’t be taxable income under CB 11.

What This Means for Farming Families

This determination has significant implications for rural New Zealand, where family companies and trusts are common structures.

Adult children buying land from family building companies: If you’re over 18 and not a trustee, settlor, or appointor of the family trust—and you don’t own 25% or more of the building company yourself—you’re likely not associated for land provision purposes.

Being a beneficiary isn’t enough: Trust beneficiary status alone doesn’t create association for these rules. You need a more active role.

The 25% threshold matters: If you personally hold 25% or more of a building company, association kicks in. Below that threshold, you’re generally safe.

Succession planning opportunity: This narrower definition creates planning opportunities for families transitioning out of building businesses into farming or other ventures.

Important Caveats

Before you celebrate, remember:

Other provisions might still apply. Just because CB 11 doesn’t catch you doesn’t mean you’re home free. The intention test, the development business provisions, or other land taxing rules might still apply.

Timing is everything. The association test applies when building work begins. If your circumstances change during construction, that doesn’t help you.

Each case is different. This determination is fact-specific. Your situation might have additional factors that change the outcome.

Documentation is crucial. If you’re relying on not being associated, document your position clearly.

What Should You Do?

If you’re in a similar situation:

• Get advice early. Before you start any building project on land connected to a family building business, talk to your accountant.
• Review your structure. Understand who owns what, who’s a trustee of what trust, and what powers exist.
• Document your intentions. If you genuinely intend to build a home (not a development), document that clearly from day one.
• Consider your options. If association is a problem, there might be ways to restructure before building begins.
• Don’t assume. The general association rules and the land provision rules are different. What seems obvious often isn’t.

The Bottom Line

The CB 11 builder rule is less of a trap than many people think, thanks to narrower association rules for land provisions. Adult children buying land from family building companies often aren’t caught—provided they’re not trustees, settlors, appointors, or 25%+ shareholders.

But every situation is unique. The stakes are high, with potential six-figure tax bills on the line.

If you’re dealing with land transactions involving family building businesses, or if you’re planning succession from a building business into farming, talk to us first. We’ll help you navigate these rules and structure your affairs properly from the start.