Running a business comes with enough challenges without tax surprises, missed deductions, or unexpected IRD bills.
Whether you're a sole trader, contractor, tradie, rental property owner, or running a limited company, getting the basics right can save you both time and money.
At Clearstep Chartered Accountants, we regularly work with New Zealand business owners who are great at what they do but often aren't sure whether they're handling their tax obligations correctly. As a small business accountant in Auckland, here are five of the most common tax mistakes we see and how you can avoid them.
1. Mixing Personal and Business Finances
This is one of the easiest mistakes to make, especially when you're first starting out.
Using the same bank account for both personal and business spending can quickly create confusion. It becomes harder to track expenses, identify deductible costs, and prepare accurate GST returns or year-end accounts.
Many business owners end up spending unnecessary time sorting through transactions when tax season arrives.
How to Avoid It
Open a dedicated business bank account and use it exclusively for business income and expenses. It will make bookkeeping simpler and give you a much clearer picture of how your business is performing.
2. Leaving Your Record Keeping Until Year-End
We've all heard the phrase "I'll sort it out later."
Unfortunately, later often becomes a stressful rush at the end of the financial year.
Missing receipts, incomplete records, and forgotten expenses can lead to missed deductions or additional accounting costs while information is being reconstructed.
Good Records Should Include
- Sales invoices
- Supplier invoices and receipts
- Bank statements
- Vehicle records
- Home office information
- Loan statements
- Payroll records
How to Avoid It
Spend a few minutes each week keeping your records up to date. A cloud-based accounting system can make this process significantly easier and save hours of work later.
3. Getting GST Wrong
GST is one of the areas where we see the most confusion among small business owners.
Some businesses register too early, some register too late, and others claim GST on expenses that don't qualify.
Even simple mistakes can create unnecessary complications with Inland Revenue.
Common GST Mistakes
- Missing filing deadlines
- Incorrect GST coding
- Claiming GST on private expenses
- Not understanding cash versus invoice basis accounting
- Forgetting GST on business assets sold
How to Avoid It
If you're unsure about your GST obligations, seek advice before making changes. Getting GST right from the start is often much easier than fixing errors later.
4. Missing Tax Deductions You're Entitled to Claim
Many business owners focus so much on earning income that they forget about legitimate business expenses they can claim.
As a result, they often end up paying more tax than necessary.
Depending on your business, deductible expenses may include:
- Accounting fees
- Business insurance
- Professional subscriptions
- Mobile phone and internet costs
- Software subscriptions
- Training and professional development
- Vehicle expenses
- Home office expenses
Every situation is different, so it's important to make sure claims are properly supported and meet IRD requirements. Filing your income tax returns accurately ensures you claim everything you're entitled to.
How to Avoid It
Keep receipts throughout the year and ask questions if you're unsure whether an expense is deductible.
5. Only Looking at Your Numbers at Tax Time
Many business owners treat accounting as a compliance exercise rather than a business tool.
The reality is that your financial information can help you make better decisions throughout the year.
When you regularly review your numbers, you're more likely to identify:
- Cash flow issues before they become problems
- Opportunities to improve profitability
- Areas where costs are increasing
- Tax obligations that need planning
- Growth opportunities
How to Avoid It
Review your business performance regularly rather than waiting until your annual accounts are due. Even a simple monthly review can provide valuable insights into how your business is tracking.
Why Working With a Chartered Accountant Matters
Tax legislation changes regularly, and every business has different circumstances.
What works for a sole trader may not be suitable for a limited company, and what applies to one rental property owner may not apply to another.
Working with a Chartered Accountant helps ensure you're not only meeting your compliance obligations but also making informed financial decisions throughout the year.
In Short
Separate your finances, keep records as you go, get GST right, claim every deduction you're entitled to, and review your numbers regularly. A little structure throughout the year saves time, money, and stress at tax time.