Couple Income Split Tax Calculator

When a couple own and run a company together, how they pay themselves makes a real difference to the tax the household pays. Because New Zealand taxes individuals on a progressive scale, two people each earning a moderate income usually pay far less combined tax than one person earning the lot, since the second person gets their own run through the lower 10.5 and 17.5 percent brackets. This calculator works out the split of shareholder salaries between the two of you that uses both sets of brackets most efficiently and minimises your combined income tax. Enter the total pay you want to draw from the company as shareholder salaries, plus any other taxable income each partner already has from outside the business, and it finds the optimal allocation, shows each partner's resulting income, tax and marginal rate, and tells you how much you save compared with running the whole amount through one person. There is an important catch, and it is the whole point of doing this properly: each salary has to reflect the genuine work that person actually does in the business. Inland Revenue can and does challenge salaries that do not match the work performed, and the well known Penny and Hooper cases confirmed that paying an artificially low salary to divert income is tax avoidance. The good news is that where both partners genuinely work substantially full time in the company, the excessive remuneration rule does not restrict a commercially realistic split. Use this to understand the size of the prize, then confirm the actual numbers with your accountant. It is general information, not tax advice.

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Calculate.co.nz partner
Combined tax saved vs running it all through the higher earner
$7,562
Pay Partner A$50,000
Pay Partner B$50,000
Combined tax (optimal)$15,316
Combined tax (all to higher earner)$22,878
Partner ATotal income $50,000
Tax $7,658
Marginal rate 17.5%
Partner BTotal income $50,000
Tax $7,658
Marginal rate 17.5%
Important: each salary must reflect the genuine work that partner does in the business. A salary that does not match the work performed can be reallocated by Inland Revenue. This tool shows the tax-minimising split; the amount you can defensibly pay each person is limited by the real work each does. General information only, not tax advice.

How it works

New Zealand income tax is progressive, so the first dollars each person earns are taxed at 10.5 percent and 17.5 percent before any higher rate applies. When one partner takes all the company pay, much of it is taxed at 30, 33 or even 39 percent, while the other partner's low brackets sit unused. Splitting shareholder salaries between two genuinely working partners fills both sets of low brackets, which lowers the combined bill. The calculator tests every possible split of the amount you enter and reports the one that produces the lowest total tax, given each partner's other income.

Worked example. A couple draw $100,000 of shareholder salaries and have no other income. Run through one partner, that is tax of about $22,878 (the top of it taxed at 30 and 33 percent). Split $50,000 each, both stay within the 17.5 percent band, and the combined tax is about $15,316, a saving of roughly $7,562, as long as both genuinely do work worth around $50,000.

The rules that matter

  • Salaries must reflect real work. Each amount should be commercially realistic for that person's role, hours and skills.
  • Working owners are not caught by the excessive remuneration rule. Section GB 25 of the Income Tax Act 2007 does not restrict the salary of a shareholder, director or relative who works substantially full time in the business.
  • Artificial splits are avoidance. Paying a token salary to divert income to a lower-rate partner who does little work was struck down in the Penny and Hooper cases.
  • The attribution rule can apply where a working person earns over $70,000 and most of the income comes from one source, which can attribute income back to that person.

Who this is for

Couples who jointly own and both work in a company that earns trading income, deciding how to set their shareholder salaries for the year. It is a planning aid to size the benefit before you confirm the numbers with an accountant.

What this calculator assumes

  • The current 2025/26 individual tax brackets: 10.5% to $15,600, 17.5% to $53,500, 30% to $78,100, 33% to $180,000, 39% above.
  • The amount entered is paid as shareholder salaries (deductible to the company) and taxed at each person's marginal rate.
  • It calculates income tax only. It does not include ACC levies, KiwiSaver, student loan repayments, Working for Families or the attribution rule.
  • Results are indicative; each salary must reflect genuine work performed.

Official sources

Frequently asked questions

Is income splitting between a couple legal in New Zealand?

Yes, through shareholder salaries, when both partners genuinely work in the company and the salaries reflect the real work each does. Artificial splits to a partner who does little work can be treated as avoidance. Working owners are not caught by the excessive remuneration rule.

How much can we pay each partner?

A commercially realistic amount for the work each person actually performs. Inland Revenue can challenge a salary that does not match the work.

What about dividends?

Dividends are paid from after-tax profit in proportion to shareholding and carry imputation credits for the 28 percent company tax. Salaries are the usual income-splitting lever because they are deductible and flexible to the work done.

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