The label doesn't decide the outcome. Purpose, use and life span do. This guide separates deductible business consumables from trading stock, depreciating assets, repairs, capital improvements and private expenses, using current ATO rules. We checked the rules against the 2026-27 income year, and form labels below come from the 2025-26 return instructions.
Key Takeaways
- A deduction needs a clear link to earning income and can't be private, capital or specifically denied.
- Materials held for sale or manufacture are usually trading stock, not ordinary supplies.
- Office consumables are generally deductible; durable equipment is depreciated or written off under asset rules.
- Itemised records, business-purpose notes, stock counts and asset registers protect the claim.
What Qualifies as Materials and Supplies for Tax Purposes?
The business-purpose and deductibility test
Section 8-1 of the ITAA 1997 allows a deduction to the extent an outgoing is incurred in gaining assessable income or necessarily incurred in carrying on a business for that purpose. The ATO breaks this into three checks:
- The expense is for business purposes
- It is an allowable deduction
- It has no private portion
You cannot deduct amounts that are capital, private or domestic, or otherwise denied. Your bookkeeping category doesn't change that. What matters is what the item is, how long it lasts, how you use it and how it connects to income.
Consumable supplies used in daily operations
The ATO lists office stationery and purchases of products or services for the business among day-to-day operating expenses. Typical examples:
- Printer paper and ink
- Packaging materials
- Cleaning products
- Disposable protective consumables
- Small production inputs used up in normal work
These are examples, not automatic deductions. Confirm the business use, strip out any private portion, and check the treatment of the specific item.
Materials used to produce goods or complete customer work
Raw materials, components and project inputs tie directly to revenue in manufacturing, construction, catering and retail. The key question is what happens to the item.
- Consumed while delivering a service: usually an operating expense.
- Incorporated into a product, handed to a customer or held in stock: often trading stock.
Items with mixed business and private use
Claim only the business-use portion. Say you buy a laptop used for business and by the family. You'd apportion the cost.
A repair on a laptop used only for business can be claimed in full, per the ATO. There's no universal percentage. Support yours with evidence such as a usage log, diary entries over a representative period, or job records.
Materials, Supplies, Inventory, and Assets: What Is the Difference?
Supplies versus trading stock and cost of goods sold
Trading stock covers goods produced, manufactured or acquired and held for manufacture, sale or exchange in the ordinary course of business. Supplies keep the business running. Stock is what the business sells or turns into what it sells.
| Question | Supply | Trading stock |
|---|---|---|
| Purpose | Operate the business | Sell or make into goods for sale |
| Customer receives it? | Usually no | Yes, or it becomes part of the product |
| Record | Operating expense | Stock on hand, cost of sales |
| Tax effect | Deduction when incurred | Opening-to-closing stock change adjusts income |
Examples across industries
The same physical item can be treated differently depending on the business.
- Raw fabric used by a clothing maker: trading stock.
- Mailers used to send those products: usually an operating expense.
- Ingredients in a café: trading stock or cost of sales.
- Sandpaper used by a tradesperson: a consumable.
- Paper in an office: stationery.
Supplies versus depreciating assets
Computers, machinery, furniture and durable tools give benefits over more than one period. They generally go through decline-in-value rules, not an immediate supplies deduction.
From 1 July 2026, the $20,000 instant asset write-off lets eligible small businesses with aggregated turnover under $10 million deduct the business-use portion of an eligible asset costing less than $20,000. The limit applies per asset, and exclusions apply.
Other rules sit alongside it:
- Small-business pool for assets of $20,000 or more: 15% in the first year, 30% after.
- Low-value pool for assets under $1,000: 18.75% in the first year, 37.5% after.
- The $300 rule covers assets used mainly to earn income other than from a business. It is not a general business write-off.
Repairs versus improvements
A repair that restores function without changing the asset's character may be deductible. Initial repairs to defects present at purchase, replacing an entirety, and improvements are capital.
For example, replacing worn belts and seals on a workshop compressor is routine repair. Using the same materials to build a new extraction system, or to upgrade the compressor's capacity, creates or improves an asset.
Office supplies as an accounting category
Bookkeeping usually records office supplies as an operating expense. Tax treatment still depends on business use, timing and the item's nature. A monitor belongs under equipment, a repair part under repairs, and goods for resale under trading stock or cost of sales.
How to Claim the Deduction and Determine Timing
When the expense becomes deductible
Operating expenses are generally claimed in the year incurred. Cash versus accrual accounting affects when income is recognised, but it does not turn every deduction into a cash-paid item. Prepayments and capital assets follow separate rules.
For prepaid expenses, the ATO's prepayment guidance describes a 12-month rule for eligible small businesses: the service period must be 12 months or less and end by the last day of the next income year. Other prepayments are generally spread over the service period.
Durable items belong in an asset register and are claimed through depreciation or an available write-off. Check eligibility, business-use share, effective life and the income-year limits before lodging.
Trading stock and year-end purchases
Buying materials in June doesn't automatically give you a full deduction if they're still sitting on the shelf. Stock on hand at year end is generally counted and valued at cost, market selling value or replacement value, and the change from opening stock affects your result.
Eligible businesses can skip a formal stocktake if a reasonable estimate shows the opening-to-closing difference is $5,000 or less. That's a simplification, not a licence to drop stock records.
GST and income-tax treatment
GST credits and income-tax deductions are separate calculations. If you're entitled to a GST credit, the deduction is reduced by that credit. If you can't claim the credit, the GST-inclusive cost may be deductible when the expense otherwise qualifies.
For GST-credit purchases above $82.50 including GST, you need a valid tax invoice.
Claim preparation and return classification
Map your accounts to the return categories for your entity. In the 2025-26 instructions:
- Sole trader: Business and Professional Items schedule, item P8 (depreciation, repairs and maintenance, all other expenses).
- Company: item 6, with label A for cost of sales, X for depreciation, Z for repairs and maintenance, and S for all other expenses.
- Partnership and trust: the business and professional items sections of each return.
Confirm labels for the right income year. Software categories aren't conclusive. Have a registered tax professional review unusual, high-value, mixed-use or recurring purchases first.
Examples by Business Type
Construction, trades and project businesses
- Timber, concrete, wiring and fasteners built into a client project are typically project inputs
- Gloves and disposable job-site items count as consumables
- Materials bought for a later job may be stock on hand
- Replacement parts follow the repair-versus-capital test
Manufacturing, retail, hospitality and e-commerce
- Ingredients, components and goods for resale are trading stock
- Cleaning products, labels and shipping consumables support operations
- Hospitality packaging: the ATO's food-packaging example is a GST point, not an income-tax deductibility rule
Service businesses and office-based companies
- Paper, toner, stationery and small accessories are ordinary expenses
- Some software subscriptions and cloud services are operating expenses, as the ATO's digital-expense guidance shows with a booking-software example
- Laptops, training and capital items need separate treatment
Non-qualifying or high-risk examples
- Household shopping and personal items
- Client gifts and entertainment (no blanket deduction; FBT exceptions may apply)
- Inventory coded as supplies
- Capital improvements claimed as repairs
- Purchases backed only by vague card statements
Records, Bookkeeping, and Common Mistakes
Records that substantiate the claim
Most business records must be kept for five years, according to the ATO's record-keeping rules. Keep:
- Itemised invoices and receipts with supplier details and dates
- Payment evidence
- Business-purpose notes and job or project codes
- Inventory counts and asset-register entries
- Tax invoices for GST credits
- Notes showing whether an item was consumed, sold, built into a product, held at year end or partly private
Common classification and substantiation errors
- Lumping unrelated purchases into one account
- Treating every low-value item as a supply
- Ignoring stock on hand
- Claiming the private share
- Deducting improvements as repairs
- Using round-number estimates or non-itemised payment records
Avoid importing US dollar thresholds, de minimis rules or Schedule C categories. Australian rules differ.
Bookkeeping support for Australian businesses
VJM Global provides accounting outsourcing, bookkeeping, payroll processing and tax compliance support for Australian businesses, including expense classification. That support is most useful with high purchase volumes, multiple projects, inventory, mixed-use assets or cross-border reporting. The firm serves Australian clients remotely and doesn't operate an Australian office.
Frequently Asked Questions
What expense category are office supplies?
Bookkeeping usually records them as operating expenses. The tax treatment still depends on business use, asset characteristics, timing and current ATO rules.
What is the difference between materials and supplies for tax purposes?
Materials that become part of goods or customer work may be trading stock. Supplies are consumed in running the business. Capital assets and repairs follow their own rules.
Are materials and supplies tax deductible in Australia?
Qualifying business expenses can be deductible, subject to business purpose, private-use exclusions, timing, stock and capital rules, and GST treatment.
Are materials used to make products treated as supplies or trading stock?
Materials used to produce goods or held for resale are generally trading stock or cost of sales, not ordinary operating supplies.
Can I claim equipment as a supplies deduction?
Usually not. Durable equipment is depreciated or claimed under a write-off such as the $20,000 instant asset write-off. Check eligibility, business use and effective life.
What records do I need to claim materials and supplies?
Itemised invoices, payment evidence, the business purpose, stock or asset records, apportionment support and tax invoices where you claim GST credits.
