Imputation credits prevent double taxation on company profits in New Zealand. When a NZ company pays income tax, it can attach those tax credits to dividends — so shareholders don’t pay tax twice on the same income. Understanding imputation is essential for anyone who receives company dividends or invests in NZX shares.
NZ companies pay 28% tax on profit. When they distribute that profit as dividends, they attach imputation credits equal to the tax already paid. The shareholder includes the grossed-up dividend as income, but gets credit for the 28% already paid. If your personal tax rate is 33%, you top up 5%. If your rate is 17.5%, you get a 10.5% refund. Imputation credits from NZX shares appear automatically in your IRD automatic assessment.
What Imputation Is (and Why It Exists)
Without imputation, company income would be taxed twice:
- At the company level (28%)
- Again when paid as dividends to shareholders (at personal rates up to 39%)
The NZ imputation system attaches a credit to dividends representing the tax already paid at company level. The shareholder then pays only the difference between 28% and their personal rate — not the full personal rate again.
How Imputation Works — Step by Step
The company side:
- Company earns $100,000 profit
- Pays 28% income tax = $28,000 to IRD
- Has $72,000 after-tax profit to distribute
- Pays $72,000 as a fully imputed dividend
- Attaches $28,000 imputation credits to the dividend
The shareholder side:
- Receives $72,000 cash dividend
- Receives notice of $28,000 imputation credits
- Declares $100,000 gross dividend as income (cash + credits = $100,000)
- Calculates tax at personal rate on $100,000
- Subtracts $28,000 imputation credits
- Pays (or receives) the difference
Outcomes by Tax Rate
| Shareholder’s personal tax rate | Tax on $100k gross dividend | Less imputation credit | Outcome |
|---|---|---|---|
| 10.5% | $10,500 | −$28,000 | $17,500 refund |
| 17.5% | $17,500 | −$28,000 | $10,500 refund |
| 28.0% | $28,000 | −$28,000 | Square — no extra tax |
| 30.0% | $30,000 | −$28,000 | $2,000 to pay |
| 33.0% | $33,000 | −$28,000 | $5,000 to pay |
| 39.0% | $39,000 | −$28,000 | $11,000 to pay |
This shows why imputation credits matter for low-income shareholders — they can generate refunds. And why the company structure is most tax-efficient when retained (not distributed to high-rate shareholders).
The Imputation Credit Account (ICA)
Companies maintain an Imputation Credit Account (ICA) — a ledger recording tax paid and credits distributed:
- Adds to ICA: Income tax payments, provisional tax payments, RWT paid
- Reduces ICA: Imputation credits attached to dividends paid
The ICA cannot go into deficit — you cannot attach more credits than tax paid. An ICA debit balance results in an imputation penalty tax of 10% of the deficit.
Maximum Imputation Ratio
For a company taxed at 28%, the maximum imputation credit per $1 of dividend is: $$\frac{28}{72} = 0.3889$$
In practice, a $72 dividend can carry a maximum $28 imputation credit (totalling $100 gross). This is called a fully imputed dividend.
Dividends can be partially imputed (fewer credits than the maximum) or unimputed (no credits — common for companies that have not paid sufficient NZ tax).
Imputation Credits From NZX Shares
When you hold shares in NZX-listed companies and receive dividends:
- Dividend notices show the imputation credit per share
- Your share registry or broker (Sharesies, InvestNow) provides a year-end tax statement
- IRD’s automatic assessment includes these credits automatically (if the company has reported them)
Check your automatic assessment each year to ensure imputation credits from shares are included — they can significantly reduce your tax bill or generate a refund.
Imputation Credits in PIE Funds
Portfolio Investment Entities (PIEs) like those in KiwiSaver, Simplicity, or InvestNow do not pass imputation credits directly to investors. Instead, the PIE fund uses the credits to reduce the fund’s internal tax liability, benefiting investors indirectly through better after-tax returns.
Frequently Asked Questions
Do I need to do anything to receive imputation credits?
For NZX dividend income, imputation credits should appear automatically in your IRD automatic assessment (if IRD has the data from the company). For private company dividends, ensure the imputation notice is included in your IR3 return.
What if a company doesn’t have enough imputation credits?
If a company distributes unimputed dividends (no credits), IRD still taxes the shareholder at their full personal rate — no credit applies. RWT may also be deducted at the dividend source.
Can I carry forward imputation credits I can’t use this year?
Yes — if imputation credits exceed your tax liability in a year, the excess refunds to you (for individuals). The credit is not lost.
Do overseas companies attach imputation credits?
No — imputation credits only apply to NZ companies that have paid NZ tax. Overseas companies cannot attach NZ imputation credits. Instead, foreign tax credits apply for overseas withholding tax paid. See FIF Tax NZ for overseas share tax rules.