Growth is where tax becomes a cashflow problem. Profit rises, obligations follow with a lag, and the money has usually already gone into stock, debtors and equipment.
The provisional tax trap
The standard method bases instalments on last year plus an uplift. For a growing business that means paying instalments calculated on a smaller prior year, then facing a large terminal payment on the actual result.
Businesses that grow 40 percent and pay provisional tax on the prior year discover the gap at terminal tax date, by which time the cash is committed elsewhere.
Options: stay on the standard method but provision separately for the terminal shortfall, or estimate — which carries use-of-money interest risk if you estimate low. For businesses with genuinely good visibility, estimation is the better tool. For those without, provisioning is safer than guessing.
Thresholds that change your obligations
- GST registration at $60,000 turnover, and the loss of the payments basis for GST accounting once you exceed its threshold — which shifts GST onto invoices rather than receipts and can bite hard for a business with credit customers.
- Provisional tax obligations, and the loss of eligibility for AIM as turnover rises.
- Financial reporting requirements, which step up with size.
- Employer size affects PAYE payment frequency.
- Climate-related disclosure and other reporting regimes, which apply only to large entities but are worth knowing exist.
Structure review at growth points
A structure chosen at start-up frequently stops fitting. Triggers for review:
- Sustained profitability above your personal marginal rate thresholds.
- Bringing in a partner, investor or key employee with equity.
- Acquiring property or significant assets.
- Starting a second, different business line.
- Contemplating a sale within a few years.
Restructuring can trigger tax consequences — depreciation recovery, trading stock disposal, GST on asset transfers — so it is cheaper to review at a natural point than to restructure under pressure.
Capital versus revenue
Growth spending divides into deductible revenue expenses and capital items that are depreciated or not deductible at all. The distinction is not always intuitive.
Areas that recur: repairs versus improvements to property, software development costs, fitout, and legal and professional fees on transactions. Fees relating to a capital transaction generally follow the capital treatment.
Getting this wrong in either direction is a problem. Over-claiming produces an adjustment; under-claiming leaves money with Inland Revenue.
Losses
Where a growing business makes losses, the ability to carry them forward depends on continuity of ownership. A share issue to a new investor can breach the shareholder continuity requirement and forfeit accumulated losses.
The business continuity test provides some relief where the business continues in substantially the same way, but it has conditions. This is a specific thing to raise with an adviser before an equity raise, not after.
The R&D Tax Incentive
A credit equal to 15 percent of eligible R&D expenditure, with a $50,000 minimum spend that is waived where expenditure is with an approved research provider.
The eligibility test is whether the activity seeks to resolve scientific or technological uncertainty. Software development, process improvement and engineering design routinely qualify, and a large number of eligible businesses never claim because they do not think of what they do as research.
General Approval must generally be obtained, with deadlines running from balance date, so this needs attention during the year rather than at filing. Budget 2026 announced proposed changes, so confirm current settings.
Cash discipline through growth
The single most useful habit: move GST, PAYE and a provision for income tax into a separate account as revenue arrives.
Growing businesses consume cash even when profitable, because debtors and stock grow with sales. Tax obligations arrive on their own schedule regardless. A separate account removes the temptation to fund working capital with money that belongs to Inland Revenue.
Talk to Inland Revenue early if it goes wrong
Instalment arrangements are available and are considerably easier to agree before a due date than after. Tax debt attracts interest and penalties, and it escalates. Businesses that engage early generally get workable arrangements.
Inland Revenue publishes provisional tax, AIM and R&D guidance free at ird.govt.nz, and its tax policy site publishes technical material on changes.
General information only, not tax advice.
