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Guide

Depreciation on plant, without the guesswork.

The tax treatment of a financed machine is decided by the structure, the accounting basis and the asset category, and none of those are visible from a website. This guide explains the mechanism and points at who settles it.

MS
Matt Stiles Editor
Published 7 September 2026 Last reviewed 7 September 2026 Read time 9 min

Read this first

This guide describes a mechanism, not a treatment.

Everything below is general information about how depreciation works in New Zealand. It is not a statement about how any particular purchase will be treated, because that depends on the finance structure chosen, the accounting basis the business uses, the category the asset falls into and how the asset is actually used, and no website can see any of those. Every claim in this guide is subject to the accountant’s confirmation on the specific business position, and Inland Revenue is the primary source for any specific question.

The short version

Four things worth knowing before signing.

  • The claim follows ownership. Under a hire purchase or chattel mortgage the business is ordinarily treated as the owner and claims depreciation, subject to the accountant’s confirmation. Under an operating lease the financier ordinarily does, and the business claims the rental instead.
  • Inland Revenue publishes the rates. The rate finder gives a rate per asset category, and the category a particular machine falls into is a question for the accountant rather than a matter of opinion.
  • Two methods produce different timing. Diminishing value front-loads the deduction and straight line spreads it evenly. Both reach the same place eventually and they feel very different in year one.
  • GST timing is a separate question. Under a hire purchase the GST on the purchase is generally claimable up front rather than across the payments, subject to the accountant’s confirmation, and it is a cash-flow event distinct from the depreciation claim.

The mechanism

What depreciation actually is.

A machine bought for a business is not an expense in the year it is bought. It is an asset that declines in value across the years it is used, and depreciation is the mechanism that recognises that decline as a deduction over time rather than all at once. That is the whole idea, and everything else is detail about rates, methods and who is entitled to claim.

Inland Revenue publishes rates by category of asset, and its rate finder is the place those are looked up. The categories are more granular than most people expect, and the same physical machine can fall into different categories depending on the industry it is used in. Choosing the category is a matter for the accountant rather than for the buyer, because getting it wrong is a filing question rather than a preference.

What makes this interact with finance is ownership. Depreciation is ordinarily claimed by whoever owns the asset, subject to the accountant’s confirmation, and the finance structures on this site differ precisely on who that is during the term. That is why the tax question and the structure question cannot sensibly be answered separately.

What it recognises

Decline in value

Applies to

Assets used to earn income

Rate source

The IRD rate finder

Timing

Across the asset’s life

By structure

Who ordinarily claims what.

General positions only, and every line is subject to the accountant’s confirmation on the specific arrangement, because the treatment turns on facts particular to the business.

StructureDepreciation claimGST on the purchaseWhat the business deducts
Hire purchaseOrdinarily the businessGenerally claimable up frontDepreciation plus the interest component
Chattel mortgageOrdinarily the businessGenerally claimable up frontDepreciation plus the interest component
Finance leaseDepends on the arrangementDepends on the arrangementDepends on the accounting treatment
Operating leaseOrdinarily the financierTypically on each rentalThe rental as an expense

General positions across the common structures. Subject to the accountant’s confirmation in every case.

The two methods

Diminishing value against straight line.

Diminishing value

More early, less later.

The deduction is calculated on the asset’s remaining value each year, so it is largest in the first year and falls thereafter. It broadly mirrors how equipment actually loses value, since most plant loses more in its first years than in its last.

For a business with taxable profit now, front-loading the deduction is worth more than the same total spread evenly, because a deduction taken earlier is worth more than one taken later.

Straight line

The same each year.

The deduction is the same amount every year across the asset’s life, which makes forecasting simpler and produces a smaller deduction in the early years than diminishing value does.

Which method suits depends on the business’s tax position rather than on the machine, and the choice is one the accountant makes with the whole picture in view. Inland Revenue publishes both rates for each asset category.

Practical points

Six things that come up in practice.

01

The category matters more than the machine

The same physical asset can sit in different categories depending on the industry it is used in, and the rate differs accordingly. This is a filing question for the accountant, not a judgement call for the buyer.

02

Interest and principal are different

Under a hire purchase the interest component of the payments is ordinarily deductible while the principal is not, subject to the accountant’s confirmation, because the principal is buying an asset that is being depreciated separately.

03

GST timing is a cash-flow event

Under a hire purchase the GST on the purchase is generally claimable in the return covering the period the agreement begins, subject to the accountant’s confirmation, and it is a separate matter from depreciation that lands much sooner.

04

Installation may form part of the cost

Costs of getting an asset to the point of use can form part of its cost base for depreciation, which is another reason to have installation quoted rather than absorbed. The accountant confirms what qualifies.

05

Disposal produces an adjustment

Selling or trading an asset for more or less than its depreciated value produces a tax adjustment in that year, which is a real consequence of an upgrade and is easy to overlook.

06

Private use changes the position

Where an asset is used partly privately, the deduction is ordinarily apportioned. This arises more often on vehicles than on plant and is a common source of error.

Illustration

How the timing differs, in shape rather than in figures.

A $100,000 machine financed over five years and depreciated by the business, which is the ordinary position under a hire purchase, shows the shape of it. Two things happen on different timelines and are frequently confused with each other.

The GST on the purchase is generally claimable in the return covering the period the agreement begins, subject to the accountant’s confirmation of the accounting basis used. That is a single cash-flow event landing within months of settlement, and it is often the largest immediate effect of the whole transaction.

The depreciation deduction, by contrast, is spread across the years the machine is used, at the rate published for its category. Under diminishing value it is largest in year one and falls; under straight line it is even. Neither method changes the total that is eventually deducted, and both change when the benefit arrives, which is what makes the choice worth making deliberately rather than by default.

The two timelines

Amount financed
$100,000
GST claim
Within months
Depreciation
Across the asset’s life
Who decides the method
The accountant

Illustrative and general. The treatment of any particular purchase is subject to the accountant’s confirmation.

Where it goes wrong

Four errors an accountant sees repeatedly.

The first is treating the finance repayment as the deduction. Under a hire purchase the payment is part interest and part principal, and only the interest component is ordinarily deductible, subject to the accountant’s confirmation, because the principal is buying an asset that is being depreciated separately. Deducting the whole payment and also claiming depreciation counts the same cost twice, which is why the split is confirmed with the accountant rather than assumed.

The second is choosing a structure for its weekly figure and discovering the tax consequence afterwards. An operating lease and a hire purchase on the same machine produce genuinely different tax positions, and the sequence that works is to establish the position first and select the structure second rather than the other way round.

The third is missing the disposal adjustment. Trading a machine for more or less than its depreciated book value produces an adjustment in the year of disposal, and an upgrade that felt like a straightforward swap can carry a tax consequence nobody costed. Raising it before the trade rather than after is the difference between a planned outcome and a surprise.

The fourth is apportionment on assets with private use. Where a vehicle or a machine is used partly privately the deduction is ordinarily apportioned, and the apportionment has to reflect actual use rather than an estimate made once and never revisited. This arises more on utes than on plant and it arises often.

Timing

When to have the conversation.

The useful moment to raise a purchase with an accountant is before the finance structure is chosen, not after the machine arrives. By then the structure is fixed, the ownership position is fixed and with it the depreciation claim, and the only remaining question is how to file what has already happened. Fifteen minutes before signing is typically worth considerably more than an hour afterwards, and it is among the cheapest professional advice a business will take on an equipment purchase.

The other number

The repayment, which is not the deduction.

The calculator produces the cash cost of the facility. The tax effect is separate, arrives on a different timeline, and is confirmed by the accountant. Indicative only, and not a quote or offer of credit.

Indicative repayment

Weekly

Disclaimer

$490/week

$2,125 /month $27,482 total interest
$100,000
$5,000 $500,000
5 years
6 months 5 years
10.00% p.a.
8% (secured) 30% (unsecured)

Indicative only. Not a quote or offer of credit. Actual rates, fees, and repayments depend on the business profile and the lender's decision.

The right weight

How much the tax treatment should influence a purchase.

Tax treatment changes the after-tax cost of an equipment purchase at the margin. It does not change whether the machine earns its keep, whether the business can service the payments, or whether the capability is needed, and those three decide the purchase.

A machine that only makes sense because of its tax treatment is usually a machine worth re-examining. That is not an argument for ignoring the tax position; it is an argument for establishing it early enough that it informs the structure without driving the decision. The sequence that works is to decide whether the machine is worth buying, then to choose a structure with the tax position visible, and then to sign.

The one place tax genuinely does change a decision is timing. A purchase falling either side of a balance date, or a disposal creating an adjustment in a year when the business has an unusual result, are both cases where a few weeks materially change the outcome. Those are precisely the cases an accountant will spot in a short conversation and a buyer will not spot at all.

Method

How this guide was written, and its limits.

Everything here is drawn from Inland Revenue’s published guidance on depreciation and GST. No figures for specific asset categories appear on this page, deliberately. Published rates change, categories are more granular than a summary can honestly represent, and a rate quoted on a website that is read two years later is worse than no rate at all. The rate finder is linked below and is the correct place to look.

This guide is general information about a mechanism. It is not personalised tax advice, this site is not a registered financial adviser or a chartered accountant, and the treatment of any particular purchase depends on facts specific to the business. The accountant is the right person to settle it, and the useful time to ask is before the finance structure is chosen rather than after.

References

Sources

FAQ

Questions, answered

Who claims depreciation on a financed machine?

Ordinarily whoever is treated as the owner. Under a hire purchase or chattel mortgage that is normally the business, and under an operating lease it is ordinarily the financier, with the business claiming the rental as an expense instead. The position depends on the specific arrangement and is subject to the accountant’s confirmation.

Where do the depreciation rates come from?

Inland Revenue publishes rates by category of asset in its depreciation rate finder. The categories are granular, and the same physical machine can fall into different ones depending on the industry it is used in. Which category applies is a question for the accountant rather than a preference.

What is the difference between diminishing value and straight line?

Diminishing value calculates the deduction on the asset’s remaining value each year, so it is largest early and falls. Straight line spreads the same deduction evenly across the asset’s life. Both reach the same total eventually; they differ on when the benefit arrives, and which suits depends on the business’s tax position.

Is the finance repayment deductible?

Not as a whole. Under a hire purchase the interest component of the payments is ordinarily deductible while the principal is not, subject to the accountant’s confirmation, because the principal is acquiring an asset that is being depreciated separately. Under an operating lease the rental is ordinarily deductible as an expense, again subject to the accountant’s confirmation.

When can the GST on a financed machine be claimed?

Under a hire purchase, a GST-registered business is generally able to claim the GST on the full purchase price in the return covering the period the agreement begins rather than spreading it across the payments, subject to the accountant’s confirmation of the accounting basis used. That is a separate matter from depreciation and lands much sooner.

Does installation form part of the depreciable cost?

Costs of getting an asset to the point where it can be used can form part of its cost base, which is one more reason to have rigging, installation and commissioning quoted rather than absorbed. What qualifies in a particular case is confirmed by the accountant.

What happens when a depreciated machine is sold?

Selling or trading an asset for more or less than its depreciated book value produces a tax adjustment in the year of disposal. It is a real consequence of an upgrade and is easy to overlook when the focus is on the replacement, so it is worth raising with the accountant before a trade rather than after.

Does private use affect the claim?

Where an asset is used partly for private purposes, the deduction is ordinarily apportioned to reflect that. This arises more often on vehicles than on plant, and it is a common source of error because the apportionment has to be based on actual use rather than on an estimate made once.

Why does this guide not publish the actual rates?

Because published rates change, the categories are more granular than a summary can honestly represent, and a rate quoted on a page that is read two years later is worse than no rate at all. The Inland Revenue rate finder is linked in the sources and is the correct place to look.

Should the tax question be settled before choosing a structure?

It is generally more useful to do so, because the structure decides who is treated as the owner and therefore who claims what. Choosing a structure for its weekly payment and discovering the tax consequence afterwards is the ordinary sequence and it is the wrong way round.

Is this guide tax advice?

No. It is general information about how a mechanism works. This site is not a chartered accountant or a registered financial adviser, and the treatment of any particular purchase depends on facts specific to the business that a website cannot see. Inland Revenue is the primary source and the accountant is the right adviser.

Does the depreciation rate affect which machine to buy?

Rarely, and it should be visible in the decision rather than invisible. The purchase case for a machine rests on what it earns and what it costs to run. The tax treatment changes the after-tax cost at the margin, and a purchase that only works because of its tax treatment is usually a purchase worth re-examining.

Disclaimer

Indicative content only. Not personalised financial advice.

Financing a machine is a commitment that runs for years, and the repayments come out of the same operating cash flow as everything else. Modelling the weekly and monthly cost against the working-capital position before committing is what this site is built for. Borrowing at a level that stays comfortable through a quiet quarter, rather than only through a strong one, is widely regarded as the safer frame.

What this site is

A calculator and information tool. Not a lender, not a broker, not a registered financial adviser. Nothing here is personalised financial advice.

What the figures show

Modelled estimates based on the inputs shown. Not a quote. Not an offer of credit. Not a guarantee of approval, rate or fees.

What the lender decides

Final rates, fees, and approval are set by the lender after a CCCFA-appropriate assessment of the applicant's circumstances and credit decision.

Commercial disclosure

Equipmentfinance.org.nz earns a commission from Prospa when a visitor applies through this site and their application is approved. The commission is paid by Prospa, not by the borrower, and it does not influence the rate Prospa offers. Full disclosure on the partner page.

Tax, GST, and accountant framing

Tax-treatment statements (GST claim timing, interest deductibility, depreciation rates) are general in nature and subject to the accountant's confirmation on the specific business position. For material amounts, professional advice from a registered financial adviser or chartered accountant is widely regarded as the safer frame.

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Important information

About this site, the figures, and your protections.

Last reviewed 7 September 2026.

1. What this site is

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