DIY tax software is cheap and fast, which makes it tempting. But cheap is not the same as right. Here is an honest comparison of doing your own New Zealand tax versus using an accountant, across cost, risk, and time.
The two options at a glance
Both options end with a filed return. The difference is everything that happens in between, and what happens if something goes wrong.
| DIY software | Accountant | |
|---|---|---|
| Up-front cost | Low monthly subscription | A fee, often fixed and known in advance |
| Who catches errors | You do | A specialist does |
| Tax planning | Limited to what the tool prompts | Tailored to your situation |
| Time you spend | More | Less |
Software is excellent at recording transactions and producing a return from clean data. What it cannot do is notice the deduction you forgot, question a number that looks wrong, or warn you that a decision will cost you next year.
Tax treatment compared
The tax rules are identical either way. A return is a return, and IRD applies the same rates and thresholds whether you filed it yourself or an accountant did. Where the two options differ is in how confidently those rules get applied.
- DIY: the software handles the arithmetic, but it relies on you to classify everything correctly, claim what you are entitled to, and not claim what you are not. A miscoded expense or a missed provisional tax obligation looks fine to the software but not to IRD.
- Accountant: the same return, prepared by someone who knows which deductions apply to your trade, how ring-fencing or imputation credits affect you, and where the common traps sit.
For a very simple situation, salary plus a little interest, the gap is small. As soon as you add a business, a rental, GST, or provisional tax, the value of a trained eye grows quickly.
The deductions most often missed by DIY filers are the ones the software never thinks to ask about: a portion of home running costs when you work from home, vehicle expenses, the business share of a phone or internet bill, depreciation on equipment, and ACC levies. The software records what you enter, it does not know what you forgot to enter. That blind spot is exactly where a quick professional review tends to recover its own fee.
Cost and cashflow
On paper, software wins on price. A subscription is a fraction of an accountant's fee. But the real cost is what you might miss.
- A single overlooked deduction can cost more than a year of fees.
- A missed provisional-tax payment can attract use-of-money interest and late-payment penalties from IRD.
- Hours spent wrestling with the return are hours not spent earning.
A fixed-fee accountant turns an unpredictable cost into a known one. You see the number before any work starts, so there is no bill-shock, and the fee itself is generally deductible. The honest framing is: software is cheaper if your situation is simple and you are confident; an accountant usually pays for itself once your situation has any real complexity.
Risk and admin
This is where the choice really bites.
- DIY risk: you carry it. If a return is wrong, you deal with IRD, the amended return, and any penalties.
- Accountant risk: shared and reduced. A specialist is far less likely to make the error in the first place, and handles IRD correspondence if questions arise.
- Admin load: with software, the chasing, classifying, and filing are yours. With an accountant, you hand over tidy records and the heavy lifting is done for you.
Many people land in a sensible middle ground: they use software day-to-day to keep clean records, and an accountant at year-end to review, plan, and file. The two are not really rivals; software is the toolbox, an accountant is the tradesperson.
There is also the question of what happens if IRD ever asks a question. On your own, an unexpected letter means deciphering the request, finding the records, and drafting a response under a deadline. With an accountant, that correspondence is handled for you, and a return prepared by a specialist is far less likely to attract the query in the first place. Peace of mind is hard to price, but it is real.
Which suits which owner
As a general guide:
- DIY software suits simple, confident situations: a salary, a small side income, no GST, no rental, and the time and appetite to do it carefully.
- An accountant suits anyone with a business, a rental, GST, provisional tax, multiple income types, or simply no interest in spending evenings on tax.
- The hybrid suits most growing businesses: software for the books, a specialist for the review and the return.
Be honest with yourself about two things: how complex your situation really is, and how much your time is worth. Those two answers usually point clearly one way.
Talk it through with us
We are happy to tell you when DIY is genuinely fine, we would rather you keep your money than pay for help you do not need. And we will be just as direct when your situation has outgrown a spreadsheet and a trained eye will save you more than the fee.
Book a free review and we will give you a straight answer. We are Xero-friendly, so if you already use software, share your file and we will take it from there.
This is general information only, current at the time of writing, and not personalised tax advice. Your situation may differ. Confirm the detail with us or check ird.govt.nz before you act.
In plain English: software is cheaper and fine for simple returns, but once you have a business, a rental, or provisional tax, an accountant usually saves more than they cost.
This is general information, not personalised tax advice.See our full disclaimer.