Imputation credits and your top-up or refund.
Top-up tax (or refund)
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Gross dividend
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Imputation credit
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Tax at your rate
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Your breakdown
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One profit, taxed once
Imputation is New Zealand’s answer to a fairness problem: company profits would otherwise be taxed twice, once when the company earns them and again when shareholders receive them as dividends. The imputation system fixes that by letting a company that has already paid 28 percent income tax attach imputation credits to its dividends. Those credits represent tax the company prepaid on your behalf. You declare the gross dividend, work out tax at your own marginal rate, then subtract the credits. The result is that the profit is effectively taxed once, at your rate, with the company’s 28 percent counting toward it. This calculator runs that whole chain for a fully imputed dividend.
The tool is aimed at anyone holding New Zealand shares directly: investors with a sharebroker account, owners taking dividends from their own company, and people trying to understand why a dividend cheque comes with a tax statement attached.
Grossing up the cash you actually receive
You bank the cash dividend, but the cash is the after-tax amount. To find the gross income, you add back the credit. For a fully imputed dividend the credit is the cash multiplied by 0.28 divided by 0.72, which restores the figure to what it was before the company paid its 28 percent. The gross dividend is then the cash plus the credit. Your tax is the gross times your marginal rate, and the top-up (or refund) is that tax less the credit already paid. If your rate is above 28 percent you owe the difference; if it is below, the surplus credit reduces tax on your other income.
A $7,200 dividend at the 33 percent rate
Take an investor on the 33 percent marginal rate who receives a fully imputed cash dividend of $7,200. The calculator builds it up step by step.
The company already handed IRD $2,800 of tax on that profit. Because the investor sits at 33 percent rather than 28 percent, they owe a further $500 to close the gap. The bar shows how the company’s credit covers most of the tax bill, leaving only the dark top-up slice for the shareholder.
When the credit hands you money back
Flip the rate and the story changes. If that same $10,000 gross dividend lands with someone on the 17.5 percent rate, their tax is only $1,750, but $2,800 of credit has already been paid. The $1,050 of excess credit is not refunded in cash on its own, but it offsets tax on their other income, so a low-rate investor effectively recovers part of the company’s tax. This is why dividend income can be very efficient for people in lower brackets. Note the company often deducts resident withholding tax on top of the imputation credit to bring the total withheld up to 33 percent, which squares things up for most investors and is then reconciled in the year-end assessment.
A point worth remembering: there is no separate capital gains tax in New Zealand, so the return from shares held long term is usually just the dividends plus any untaxed price growth (outside the FIF rules for large offshore holdings). Imputation only touches the dividend leg, which is the part the company has paid tax on.
What is a partially imputed dividend?
A company can only attach credits up to the tax it has actually paid. If it pays a dividend out of profits that were not fully taxed in New Zealand, perhaps overseas earnings, the dividend carries fewer credits per dollar and is only partially imputed. You then face a larger top-up because less prepaid tax is available to offset. This tool assumes full imputation, which is the most common case for established New Zealand companies.
Why is the company rate 28 percent but my top-up is at 33?
Companies pay a flat 28 percent, but individuals are taxed on a progressive scale that runs up to 39 percent. The imputation credit only covers the 28 percent the company paid, so any investor whose marginal rate is higher must pay the difference. Someone on 39 percent would owe an even larger top-up than the 33 percent investor in the example.