Contracting & Consulting in NZ
Senior testers in NZ can earn 40–60% more as contractors than as permanent employees. But contracting is a business, not a job. You’re responsible for your own tax, your own pipeline, and your own reputation. This lesson covers how it works.
1 The Hook
A senior SDET leaves permanent employment to contract. First contract: $750/day, 6-month term. She assumes the agency takes a cut and she keeps the rest. What she doesn’t know: she needs to invoice as a business or sole trader, pay GST quarterly if she earns over $60,000, pay her own ACC levies, and keep 30% aside for income tax. Her first year’s tax bill comes as a surprise.
A 15-minute conversation with an accountant at the start would have saved her $4,000 in surprise payments and a lot of stress. The day rate was genuinely better than her permanent salary. But she didn’t know what she was keeping until the IRD told her.
This lesson is that 15-minute conversation.
2 The Rule
Before you take your first contract, talk to an accountant who works with contractors. The tax implications, GST registration, and business structure decisions are not optional — they determine how much of your day rate you actually keep.
3 The Analogy
Contracting is like going from a salaried cafeteria employee to owning a food truck.
The food truck earns more per meal. But you supply your own ingredients, pay your own insurance, find your own customers, and pay your own council rates. The cafeteria looked after all of that — you just showed up and made food.
Contracting works the same way. The day rate is higher. But you supply your own compliance (GST, tax, ACC), find your own next engagement (pipeline), and carry your own risk (no sick pay, no guaranteed income between contracts). Higher reward. More operational overhead. Know both before you choose.
4 The NZ Contractor Financial Model
Let’s run the numbers on a real-world NZ contracting scenario so you know what you’re actually keeping.
Example: $800/day rate, 220 working days/year
Sole trader vs limited company
Sole trader
- Register with MBIE — free, takes 10 minutes online
- Simpler compliance: no company returns, no shareholder obligations
- Personal liability for business debts
- All income taxed at personal rates
- Good for income up to approximately $120k/year
Limited company
- Register with MBIE — $160 company registration fee
- More compliance: annual returns, shareholder meetings, director duties
- Limited liability (personal assets protected from business debts)
- Flexibility to split income (salary + dividend) for tax efficiency above ~$120k
- Worth the overhead above approximately $120k/year — get advice
The practical mechanics
- Register as a sole trader with MBIE at business.govt.nz. Free, takes 10 minutes. You can trade under your own name.
- Register for GST with IRD if you’ll earn over $60,000. File GST returns quarterly or 6-monthly via MyIR. You collect GST on invoices and remit the balance to IRD.
- Open a separate bank account for business income. Keep business and personal finances separate from day one. It makes GST returns and tax time vastly simpler.
- Set aside 28–33% of every payment for income tax. Put it in a separate savings account immediately. Do not spend it. IRD will ask for it.
- Keep receipts for legitimate business expenses: home office costs (proportional to space used), professional development, equipment, professional memberships, accounting fees. These reduce your taxable income.
- File income tax annually via MyIR. As a sole trader your income tax is due 7 February (or 7 April with a tax agent). Provisional tax may apply from your second year — ask your accountant.
5 When to Use It
When considering your first contract: run the financial model before you accept. When your permanent salary has stalled: check if the contracting equivalent represents a real uplift after tax. When evaluating whether to incorporate as a limited company: the crossover point is typically around $120k gross annual income — below that, the compliance overhead of a company outweighs the tax benefit. When a recruiter quotes a day rate: convert it to an annual net figure before comparing it to your current salary.
6 Common Mistakes
🚫 “I used to think: day rate × 220 days = my income.”
Actually: gross is not take-home. After income tax (33–39% on the bulk of a contractor’s income), GST obligations, and ACC levies, the net on $800/day is closer to $505–$530/day. Still excellent compared to most permanent salaries — but know the actual number before you hand in your notice.
🚫 “I used to think: I don’t need to register for GST until I want to.”
Actually: if you earn over $60,000 NZD in a 12-month period (almost certain at contractor rates), GST registration is legally required. Late registration incurs penalties. Register with IRD before you invoice your first month — not after you’ve been paid three times. If you’re unsure, err on the side of registering.
🚫 “I used to think: contracting just means no sick pay, so save a bit extra.”
Actually: you need a buffer of at least 2 months’ income for bench time between contracts, sick days, and public holidays (which are not paid). Most experienced contractors keep 3 months in reserve. The bench time between a finishing contract and the next one starting is normal — budget for it or the cash flow will catch you out in month 7.
7 Now You Try
Build a financial comparison for the scenario below.
Show model answer
Permanent salary model: Annual salary: $115,000 Estimated income tax (NZ 2026): ~$31,200 Net salary: ~$83,800 KiwiSaver employer contribution (3%): $3,450 Annual leave value (4 weeks = 4/52 of salary): ~$8,846 Sick leave (10 days/year, ~$4,423): ~$4,423 Estimated total annual package value: ~$100,520 Contracting model (6-month contract, then 2 weeks bench): Working days in 6 months: ~130 days Less 2 weeks bench (10 days): 120 days billed Day rate: $900 Gross billings: $108,000 GST: collected and remitted — not income Income tax on $108,000 (approximate): ~$34,000 ACC levies (~1.5%): ~$1,620 Net from this contract: ~$72,380 Annualised (×2 contracts per year, same bench time): ~$144,760 net Lost benefits (annualised): no employer KiwiSaver (~$3,240 at 3%), no guaranteed sick pay (~$4,423), no paid public holidays (~$2,211 at 10 days) Total lost benefits: ~$9,874 Contracting net minus lost benefits: ~$134,886/year Permanent net total package: ~$100,520/year Conclusion: The contracting model is approximately $34,000/year better after tax and accounting for lost benefits — at this rate and bench assumption. However: no income guarantee, no KiwiSaver employer contribution, self-managed GST/tax compliance, and the bench time assumption is optimistic. Budget for a 3-month buffer. The key trap: comparing $900/day × 220 days ($198,000 gross) to $115,000 salary makes the gap look enormous. After tax and lost benefits, the real gap is real — but it's $34k, not $83k.
8 Self-Check
Click each question to reveal the answer.
Q1: At what annual income is GST registration in NZ mandatory?
$60,000 NZD in any 12-month period. At contractor day rates, this threshold is crossed very quickly — typically within 3–4 months of billing. Registration is mandatory once you exceed or expect to exceed this threshold. Late registration incurs penalties. Register before your first invoice if you expect to earn over $60k in your first year of contracting.
Q2: What is the difference between being a sole trader and a limited company for NZ contractors?
A sole trader is simpler — register free with MBIE, less compliance, personal liability for debts, all income taxed at personal rates. A limited company has more overhead (annual returns, director duties, $160 registration fee) but limits personal liability and enables income splitting (salary plus dividend) for tax efficiency above approximately $120k gross annual income. For most contractors earning under $120k, the sole trader structure is the right starting point. Get accountant advice before incorporating.
Q3: A contractor earns $750/day. The agency charges the client $900/day. What is the agency margin?
$150/day — a margin of 20% on the contractor rate ($150 ÷ $750), or approximately 16.7% on the client rate ($150 ÷ $900). Agency margins in NZ typically range from 15–25%. It’s visible to you because you can ask the agency what they charge the client. Most won’t tell you, but you can calculate it if you know the client rate and your rate. The margin is the cost of the agency finding and managing the relationship — it’s expected, not hidden.
9 ISTQB Note
Contracting is a commercial domain, not an ISTQB domain. However: contractors are often engaged specifically because of credentials and specialist expertise. ISTQB CTFL Foundation is a baseline. CTAL Test Manager or Technical Test Analyst adds material value to a contractor’s day rate — specialists command premium rates. Domain expertise (banking QA, health QA, ERP testing) adds more still. Contracting is where credentials translate directly to dollars: a contractor who can demonstrate ISTQB Advanced plus 3 years of banking QA experience negotiates differently from one who cannot.