5 Tax Deductions NZ Small Businesses
Often Miss

Most small business owners leave thousands of dollars on the table each year by missing legitimate tax deductions. Here are five of the most commonly overlooked deductions every NZ business owner should know about.

1. Home Office Expenses

If you run your business from home — even part time — you may be able to claim a portion of your rent or mortgage interest, rates, power, and internet. The key is calculating the percentage of your home used exclusively for business. IRD has a specific formula, and getting it right can add up to a significant deduction.

You'll need to be able to show that part of your home is used regularly and exclusively for business. This doesn't have to be a whole room — even a dedicated workspace can qualify. Keep records of your home costs throughout the year so you're ready at tax time.

2. Vehicle and Travel Costs

Business-related vehicle use is deductible — but you need to keep a logbook to substantiate your claim. You can claim the business percentage of fuel, insurance, repairs, and depreciation. Alternatively, IRD's mileage rate (currently 95 cents/km for the first 14,000km) can be used if you don't have a logbook.

A logbook needs to cover at least 90 consecutive days and be updated at least every three years. It must record the date, distance, destination, and purpose of each business trip. It's worth the effort — for many sole traders, vehicle costs are one of the largest deductions available.

3. Professional Development & Subscriptions

Courses, conferences, industry memberships, and software subscriptions that are directly relevant to your business are all deductible. This includes professional association fees, trade journal subscriptions, and online learning platforms like LinkedIn Learning.

The key test is whether the expense is incurred in earning your income. A management course taken to improve your business skills is generally deductible. A personal interest course is not. When in doubt, keep the receipt and discuss it with your accountant.

4. Business-Related Meals & Entertainment

Meals and entertainment with clients or business associates are 50% deductible. This applies to restaurant meals, functions, and hospitality costs where business is discussed or the purpose is to maintain or generate business relationships.

Keep a note of who attended and the business purpose of each event. Your accounting records should clearly identify these as business expenses — not personal ones.

5. Equipment Depreciation & Capital Allowances

If you purchase assets for your business — computers, machinery, office furniture — you can claim depreciation over the asset's useful life. IRD publishes depreciation rates for different asset types.

For lower-value items (under $1,000), you may be able to claim the full cost as an immediate deduction rather than depreciating it over time. This is known as the low-value asset threshold and can simplify your bookkeeping significantly.