# Tax and finance structure for tradies — GST, depreciation and entity choice
> How GST, depreciation and your entity choice shape what tradie finance costs you after tax — plain-English NZ guide with worked dollar examples.
Source: https://tradiefinance.co.nz/guides/tradie-tax-and-finance-structure-guide
Published: 2026-06-05T08:00:00.000Z
Updated: 2026-06-05T08:00:00.000Z
Category: tax-and-structure
Tags: tax-and-structure, gst, depreciation, guide
Image: https://tradiefinance.co.nz/images/resources/generated/tradie/guide/tradie-tax-and-finance-structure-guide-primary.jpg
Image alt: GST and finance paperwork representing Tax and finance structure for tradies — GST, depreciation and entity choice
TL;DR: How you buy gear matters as much as what you pay. GST-registered businesses claim the GST back, depreciate the GST-exclusive cost, and deduct only the interest portion of repayments — never the principal. Sole trader vs company changes who borrows and who carries the risk, and genuine business-purpose finance sits largely outside consumer CCCFA rules. Confirm every number with your accountant.
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Most tradies pick their finance on the rate and their business structure on a mate's say-so. Then they're surprised when the after-tax cost of the gear looks nothing like the brochure. How you're set up — GST, your entity, how the loan is structured — quietly decides how much of that ute, digger or tool fit-out you actually pay for once tax is sorted.
This is the pillar that ties it together. It won't replace your accountant — and we'll say that a lot, because the tax calls are theirs — but it'll mean you walk into that conversation knowing the right questions to ask.
## The big idea — what you buy matters less than how you buy it
Two sparkies buy the same $57,500 ute. One's a GST-registered limited company financing it on a [chattel mortgage](/glossary/chattel-mortgage); the other's a non-registered sole trader on a personal loan. Same truck, same drive-away price — yet the after-tax cost to each can differ by **thousands**, because of GST, depreciation and how the interest is treated.
Finance and tax aren't separate conversations. Your structure changes the deductions you get, the GST you reclaim, who's on the hook if it goes wrong, and even which lender takes the deal. We see this every week: get the structure right first, and the rate is the last 5%.
## GST registration — the lever most tradies under-use
You **must** register for GST once your turnover passes the current threshold (a set figure — check IRD for the number that applies now). Below that it's optional, and for a small side-hustle staying unregistered can be fine. But once you're buying serious gear, GST registration is often the single biggest lever on what that gear costs you.
Here's why. When you're GST-registered and you buy a business asset, you claim the **GST back** on the purchase — see [GST on asset finance](/glossary/gst-on-asset-finance) for how that flows through a chattel mortgage. That's real money back in your account, usually on your next return. When you're not registered, the GST is just part of your cost — gone for good.
### The 3/23 rule — claiming the GST back
NZ GST is 15%, but it's baked *into* the sticker price, so you don't multiply by 15% to find it. You use the **3/23 rule** on the GST-inclusive price:
> GST component = GST-inclusive price ÷ 23 × 3
On a $57,500 ute:
- $57,500 ÷ 23 × 3 = **$7,500 of GST** to claim back.
- Your real, GST-exclusive cost is **$50,000**.
For a GST-registered tradie, that $7,500 landing back on your next return works a lot like a delayed [deposit](/glossary/deposit). Time the purchase so the claim-back hits soon after settlement and you ease the cashflow hit. It's not free money — it was never yours to keep — but it does change the real cost of getting into the asset.
A caution: claiming GST back means you're in the GST system on the way *out* too — when you sell or trade that ute, you generally return GST on the sale price. And [GST registration](/glossary/gst-registration) is a whole-of-business decision, not asset-by-asset — a call for you and your accountant, not something to do just to claim one truck back.
## Depreciation — the deduction that runs for years
GST is a one-off. **Depreciation** is the gift that keeps giving: the tax system recognising that your gear loses value as it works, and letting you deduct that drop against business income each year. Crucially, depreciation is **separate from the loan** — you depreciate the *asset's value* no matter how you paid for it.
This is the single most misunderstood thing in tradie finance, and it's worth being blunt about: you do **not** 'write the ute off' through your repayments. You depreciate the asset, and *separately* you deduct the interest. Two different boxes.
### DV vs SL — the two methods
IRD sets depreciation rates by asset class and lets you pick a method:
- **Diminishing value (DV):** a fixed percentage of the *remaining* (written-down) value each year. Big deductions early, tapering off.
- **Straight line (SL):** the same dollar amount each year across the asset's life.
Most tradies run DV on vehicles because the bigger early deductions match how a ute sheds value fastest in its first couple of years. The DV rate for a light commercial vehicle is commonly around 30%, but **confirm the current rate and asset class with your accountant or the IRD depreciation rate finder** — rates change and depend on the exact gear. The full year-by-year mechanics live in our [chattel mortgage depreciation guide](/guides/chattel-mortgage-depreciation-work-ute).
| Method | How it works | Suits |
|---|---|---|
| Diminishing value (DV) | % of the written-down value each year | Gear that loses value fast early — utes, vans, IT |
| Straight line (SL) | Same $ each year over the asset's life | Long-life, steady-use plant where even deductions help planning |
If you claimed the GST back, you depreciate the **GST-exclusive** figure ($50,000), not the sticker price ($57,500). Depreciating the full GST-inclusive amount after you've already claimed the GST is double-dipping, and IRD will notice. If you're **not** GST-registered, the GST is part of your cost, so you depreciate the whole lot. Your accountant sets this up correctly — just know which figure they're using and why.
### Depreciation recovery — the trap on the way out
Here's the bit that ambushes people at trade-in. Say after four years your ute's written-down (tax) value is $12,000, but good utes hold value and you sell it for $22,000 GST-exclusive. You sold it for **$10,000 above** its written-down value. The tax system claws back the depreciation you "over-claimed": that ~$10,000 of **depreciation recovery is taxable income** in the year you sell. You'll generally return GST on the sale too if you're registered.
It's not a penalty — it's the system reconciling. But an upgrade year can land with a tax bill that feels like it came from nowhere, so provision for it. If your loan has a [balloon payment](/glossary/balloon-payment) or [residual value](/glossary/residual-value) at the end, that interacts with the sale maths too.
## Interest vs principal — only half your repayment is deductible
Every finance repayment is part **principal** (paying back what you borrowed) and part **interest** (the cost of borrowing). On a business-purpose loan, the **interest is deductible** against your business income. The **principal is not** — it's just you returning borrowed money.
So "deductible finance" means the interest, not the whole repayment. Early repayments are interest-heavy and later ones principal-heavy, so your interest deduction is biggest in the first year or two and shrinks over the term.
Stack it up for a GST-registered company buying that $57,500 ute on a chattel mortgage, in its first full year:
| Item | Amount | Tax treatment |
|---|---|---|
| GST claimed back (3/23) | $7,500 | Back on your GST return |
| Depreciation (DV ~30% on $50,000) | ~$15,000 | Deduction against income |
| Interest portion of repayments | ~$2,400 (illustrative) | Deduction against income |
| Principal portion of repayments | the rest | **Not** deductible |
Year-one deductions of roughly **$17,400** (depreciation plus interest), *plus* $7,500 of GST back in the bank. Those figures are illustrative — your rate, term and timing change them — but they show why the structure beats chasing the last half-percent off the rate. A [finance lease](/glossary/finance-lease) or [operating lease](/glossary/operating-lease) is treated differently again, so ask your accountant which suits.
## Sole trader vs company — who borrows, who carries the risk
Your entity choice changes how finance works for you. There's no universally "right" answer — it depends on your size, risk, income and plans — so treat this as the lay of the land, not advice. We go deeper in [sole trader vs company for tradies](/blog/sole-trader-vs-company-for-tradies).
**Sole trader.** You *are* the business. Simple and cheap to run, fewer filings. But there's no legal line between you and the business: business debts are your personal debts, and a [personal guarantee](/glossary/personal-guarantee) is almost beside the point because you're already personally liable. Lenders assess *you* — your personal income and credit. Finance is straightforward to arrange, but the risk sits entirely on you.
**Limited company.** The company is its own legal person. It borrows, owns the gear, claims the GST and depreciation, and (in principle) limits your personal exposure. In practice, lenders usually still want a **director's personal guarantee**, especially for a younger company — so the "limited liability" is thinner than people think on day one. Companies cost more to run, but they can be cleaner for splitting income, bringing in a partner, or scaling up.
The entity mostly changes *who owns the asset* and *who's first in line for the debt* — not whether you can get finance. As a sole trader the lender backs you directly; as a company it lends to the company but usually backs it with your guarantee. Either way, your personal credit and income still matter early on.
If your trade is growing and you're weighing this up, do it with both your accountant and your broker in the room: the accountant frames the tax and risk, the broker tells you how each structure lands with the lenders who'd actually fund you.
## Business-purpose vs consumer — the CCCFA line
This one's important and widely misunderstood. The **CCCFA** (Credit Contracts and Consumer Finance Act) is the consumer-protection law with the heavy affordability and suitability checks — built to protect people borrowing for *personal* use.
When you finance gear **wholly or predominantly for business purposes**, the loan is largely **outside** that consumer affordability regime. That's why genuine business asset finance can move faster than a consumer car loan — the lender isn't running the full consumer affordability assessment. To make this clear and lawful, you sign a **[business-purpose declaration](/glossary/business-purpose-declaration)** confirming the finance is for business, not personal, use. Full explainer: [does the CCCFA apply to my business loan](/blog/does-the-cccfa-apply-to-my-business-loan).
A couple of honest caveats:
- The declaration has to be **true**. Financing a family car and calling it a work ute isn't a loophole — it's a problem.
- "Faster process" doesn't mean "no checks." A responsible broker and lender still want to see the business can service the debt; it just isn't the line-by-line consumer affordability assessment.
This is where entity and purpose meet: a business-owned asset, bought by a GST-registered entity, on a business-purpose declaration, is the cleanest deal we can place across a lender panel.
## Getting your structure finance-ready
You don't need to be perfect — just tidy and consistent before you go for finance:
1. **Decide the structure before you buy**, not after. Chattel mortgage vs lease, sole trader vs company, GST or not — easiest to get right up front.
2. **Keep clean books.** Lenders and IRD both reward a tidy set of accounts; see [getting your books finance-ready](/blog/getting-your-books-finance-ready).
3. **Know your numbers.** Turnover, your GST threshold position, your rough taxable profit. You don't need them memorised, just know where they are.
4. **Match the loan to the asset's life.** Don't finance a 3–4 year ute over 7 years just to shrink the repayment — you'll pay for it long after it's earned its keep.
5. **Confirm every tax figure with your accountant or IRD.** Rates, thresholds and methods change; nothing here is a number you can bank without checking.
Structure first, tax treatment second, rate third — that order saves more than the rate ever will.
## Where this leaves you
How you're set up — GST-registered or not, sole trader or company, business-purpose or consumer — shapes the real cost of every piece of gear you finance. The GST claim-back, depreciation, the interest deduction and the entity risk all compound, and it's worth getting right *before* you sign — unwinding a structure later is the expensive way to learn.
We'll keep saying it: the tax numbers are your accountant's call and the thresholds are IRD's to set — always confirm. A broker brings the other half. As brokers, we tell you which structure lands cleanly with the lenders who'd actually fund your deal, and how the after-tax cost stacks up across the panel.
If you want to run your real numbers — purchase price, GST position, entity, and how it all lines up across lenders — talk it through with a real broker first. Book a no-pressure chat at [/book-a-call](/book-a-call), or start at the [help centre](/help) if you've just got a quick question.