# What tradies get wrong about GST and finance
> The GST and finance myths that cost tradies real money — writing off the whole ute, claim-back timing, GST on trade-in, and where the cash actually goes.
Source: https://tradiefinance.co.nz/blog/what-tradies-get-wrong-about-gst-and-finance
Published: 2026-05-21T08:00:00.000Z
Category: tax-and-structure
Tags: tax-and-structure, gst, asset-finance
Image: https://tradiefinance.co.nz/images/resources/generated/tradie/article/what-tradies-get-wrong-about-gst-and-finance-primary.jpg
Image alt: GST and finance paperwork representing What tradies get wrong about GST and finance
TL;DR: Finance does not 'write off' your ute — depreciation does, on the GST-exclusive price, over years. GST claim-back is real cash but it lands one return later, not at the till. And when you sell or trade in, you pay GST back on the sale. Plan for the timing and put the GST aside.
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The most expensive mistakes we see tradies make aren't about the interest rate. They're about GST — what it does, when it moves, and who actually ends up holding it.
Plenty of good operators believe half of these myths, and most cost real money. No judgement here — let's just clear them up, one at a time, with worked dollar examples.
## Myth 1 — 'Finance lets me write the whole ute off'
This is the big one. Someone puts a ute on finance and reckons they're 'writing the whole lot off this year.' They aren't. Not even close.
Finance is just how you *pay* for the ute. It doesn't change the tax at all. What actually reduces your tax is two separate things:
- **Depreciation** — a slice of the ute's cost claimed as a deduction each year over several years (more on this below).
- **The interest** on the loan — deductible against business income, but only the interest, not the whole repayment.
The principal you repay each month? That's not a deduction. You're just paying back money you borrowed. So when someone says "finance is a tax write-off," they've muddled the loan up with the depreciation and interest that would apply *whether you financed it or paid cash*.
Buying a flasher ute than the job needs 'for the tax' almost never pays. You spend a real dollar to save maybe 28–33c of tax (your rate — confirm with your accountant or IRD). You're still 67c down on every dollar. Buy the ute the work needs, not the one the myth says.
If you want the proper mechanics, the [chattel mortgage and depreciation guide](/guides/chattel-mortgage-depreciation-work-ute) walks through it with numbers.
## Myth 2 — 'I claim the GST back straight away'
If you're [GST-registered](/glossary/gst-registration), buying a work ute does let you claim the GST back. That part's true. The bit tradies get wrong is the *timing*.
You pay the full GST-inclusive price at settlement — finance covers it, but it's still the full amount. The GST portion (3/23 of the GST-inclusive price) doesn't come back at the counter. It comes back on your **next GST return**, which could be weeks or even a couple of months away depending on your filing cycle.
Worked example. A plumber buys a $46,000 ute, GST-inclusive:
| Item | Amount |
|---|---|
| GST-inclusive purchase price | $46,000 |
| GST portion (3/23 of $46,000) | $6,000 |
| GST-exclusive cost of the ute | $40,000 |
| When the $6,000 comes back | Next GST return, not at purchase |
That $6,000 is real cash back into the business — but you have to fund the gap until your return. If you're on a six-monthly cycle and you buy the day after filing, that's months of carrying the full amount.
This is exactly why financing the GST-inclusive price (then receiving the claim-back later) can be smart cashflow: the loan carries the GST so your bank account doesn't have to. Just don't budget as if the refund lands on day one. The [GST on asset finance](/glossary/gst-on-asset-finance) glossary entry covers how the claim works on financed purchases.
## Myth 3 — 'When I sell it, the GST is the buyer's problem'
Here's the one that bites people years later. When you sell or trade in a vehicle you claimed GST on, **you have to pay GST on the sale price** back to IRD. It's called an output tax adjustment, and tradies forget it constantly.
You claimed the GST going in. So IRD wants its share going out. Fair enough — but if you don't see it coming, the trade-in cheque feels a lot smaller than expected.
Worked example. Three years on, that plumber trades the ute in for $28,000:
| Item | Amount |
|---|---|
| Trade-in / sale price | $28,000 |
| GST you owe IRD (3/23 of $28,000) | ~$3,652 |
| What you actually keep | ~$24,348 |
So of the $28,000, roughly $3,652 isn't yours — it's GST you collect on IRD's behalf and hand over on your next return. Same rule whether it's a private sale, a dealer trade-in, or you sell it to a mate. If GST went in, GST comes out.
Claimed the GST on the way in? You pay GST on the way out. Plan the trade-in around the price you keep, not the sticker.
Always confirm the exact treatment with your accountant or IRD — there are wrinkles (like selling a vehicle that had private-use apportionment), and they matter.
## Myth 4 — 'I depreciate the full $46,000'
Nope. If you've claimed the GST back, you depreciate the **GST-exclusive** cost — $40,000 in our example, not $46,000. Claiming depreciation on the GST-inclusive figure is double-dipping, and it's a classic that gets picked up at review.
Rough illustration using a 30% diminishing-value rate (your asset's actual rate — check IRD):
| Year | Opening value | Depreciation (~30%) |
|---|---|---|
| 1 | $40,000 | ~$12,000 |
| 2 | $28,000 | ~$8,400 |
| 3 | $19,600 | ~$5,880 |
Two things to notice. First, it's spread over years — that's why "write the whole ute off this year" is a myth. Second, when you sell, if the trade-in price is higher than the book value you've depreciated it down to, IRD claws some depreciation back (depreciation recovery). Another reason the sale isn't a clean win.
If you're not GST-registered, the maths flips — you can't claim the GST back, so you depreciate the full GST-inclusive price instead, because the GST is part of your cost. One more reason [whether to register](/help/do-i-need-to-be-gst-registered) is worth a real conversation.
## Myth 5 — 'The GST refund is mine to spend'
The GST you collect on your invoices isn't your money. It's IRD's money, sitting in your account until the return is due. Same with the claim-back on your ute — it offsets the GST you owe on sales, so it's not necessarily a windfall to blow on a new compressor.
The tradies who stay out of trouble do one boring thing: **they put the GST aside.** A separate account. Every invoice paid, the GST portion goes across. Then GST time isn't a panic, and a big asset purchase doesn't blow a hole in the float.
Open a second bank account just for GST. Move the GST slice out of every payment the day it lands. Your GST return becomes a transfer, not a crisis — and you'll never be tempted to spend money that was never yours.
## The honest summary
- Finance pays for the ute. **Depreciation and interest** are what reduce your tax — not the loan itself.
- GST claim-back is real, but it lands on your **next return**, not at the till. Plan the cashflow.
- Sell or trade in, and you **pay GST back** on the sale price. Budget for what you keep.
- GST-registered? Depreciate the **GST-exclusive** cost. Not registered? The full price.
- Put the GST aside. It was never yours to spend.
None of this is a reason to avoid finance. Done right, financing the GST-inclusive price is one of the better cashflow moves a tradie can make. It's a reason to go in with your eyes open and your accountant close at hand.
Want to map your next vehicle or gear purchase against the GST and finance timing — using your actual numbers, not myths? As a broker, we place your application with the right lender and walk you through the cashflow before you commit. [Book a call with a real broker](/book-a-call), or [ask us a quick question](/help) first. No pressure, no jargon.