GST and Residential Development: When Does Your Investment Cross the Line?
- Joshua Flack
- Jul 14
- 3 min read
TL;DR
Standard residential rental is exempt from GST. You don't charge it, you don't claim it. But the moment you move into development, building to sell, subdividing, doing it repeatedly, you can cross into a taxable activity, and GST changes everything. This post explains where the line sits, what crossing it means, and why getting GST wrong on a development can wipe out the profit.
GST is the tax that catches investors moving into development off guard.
Residential rental income is GST-exempt. Most investors never think about GST at all.
Then they do their first subdivision, or build a couple of townhouses to sell, and suddenly GST is the single biggest number in the deal. Handled wrong, it doesn't just reduce the profit. It can eliminate it.
The Basic Position
Renting residential property long-term is an exempt supply. No GST on the rent. No GST claimed on costs. Clean and simple.
Buying and selling existing residential property as an investor, holding and renting, is outside the GST net.
That's where most investors live, and GST never enters the picture.
Where You Cross the Line
GST enters when you're carrying on a taxable activity. Development can be exactly that.
You're likely in GST territory when you:
Build residential property with the intention of selling it
Subdivide land and sell sections
Develop a pattern of buying, building or improving, and selling
Carry out development as a business rather than a one-off
The $60,000 turnover threshold matters. If your taxable activity turns over more than $60,000 in a 12-month period, GST registration is compulsory. A single townhouse development easily exceeds that.
What Crossing the Line Means
Once you're registered and the activity is taxable:
You charge GST on the sale (or it's baked into the sale price)
You can claim GST back on development costs (land in some cases, construction, professional fees)
The net GST position can swing significantly either way
This is where it gets dangerous. If you sell a development and GST applies but you didn't price for it, you're paying 15% out of your margin. On a tight development, that's the whole profit.
Worked Example
Build two townhouses to sell. Total sale proceeds $1.6m. If the sales are subject to GST and you didn't account for it, the GST liability is roughly $208,000 (the GST fraction of the GST-inclusive price). If your expected profit was $150,000, you're now underwater.
Conversely, if you're registered and structured properly, you claim GST on the construction costs along the way, which improves cash flow during the build.
Same project. Wildly different outcomes depending on whether GST was handled at the start.
The Intention Problem
GST and income tax both care about intention. If you bought with the intention to develop and sell, the activity is taxable from the outset, even if you tell yourself it was going to be a rental.
You can't retrofit intention after the fact. The structure and the GST treatment need to be set before you start, not worked out at sale.
Where This Leaves You
If you're a buy-and-hold investor, GST isn't your problem. Stay in your lane and it never arises.
If you're moving into any form of development, build-to-sell, subdivision, repeated projects, GST is one of the first things to get right, not the last. Get specialist accounting advice before you commit, because the GST decision shapes the whole structure.
Development finance and GST treatment are tied together. The way the project is structured for GST affects how it's funded and vice versa.
At CRISP, we work alongside your accountant to make sure the lending structure and the tax structure line up before you start. Development is unforgiving of structural mistakes.
Set it up right, once, at the start.
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About the Author:
Joshua Flack is a mortgage and lending adviser and the founder of Crisp Financial. Before finance, he spent two decades running businesses across construction, facilities services, and franchising, which is why his advice starts with how the numbers actually work rather than how the brochure says they should. He works with home buyers, investors, and self-employed borrowers across New Zealand, with particular depth in complex and non-standard lending. Crisp Financial Limited (FSP1012114) operates under the Link Financial Group FAP licence. The information in this article is general in nature and is not regulated financial advice.
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