Day Trading Tax in NZ: What You Actually Owe IRD

The short version

• If you day trade in NZ, your profits are taxable income — there's no capital gains tax to hide behind here.
• Day traders are about the clearest example there is of someone "in the business of trading", so IRD expects you to declare it.
• You're taxed at your marginal rate, and because trading income usually stacks on top of a salary, most of it gets taxed at 30–33%, not the lower bands.
• You'll likely owe ACC and, once your tax bill passes $5,000, provisional tax too.
• The upside: your costs and your losses count. Losses carry forward forever.

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Day trading is the one case where the "am I actually a trader for tax?" question basically answers itself. If you're opening and closing positions inside a day, dozens or hundreds of times a month, with the clear aim of turning a profit — you're trading as a business in IRD's eyes. Whether you're full-time or doing it around a day job doesn't change that.

So the real question isn't whether it's taxable. It's how much, and what trips people up. Let me walk through it.

Does IRD tax day trading? Yes — as income

New Zealand doesn't have a general capital gains tax, and that's where a lot of new day traders get the wrong idea. They hear "no CGT" and assume trading profits are tax-free. They're not.

The rule that catches trading is different: if you buy something with the intention of selling it for a profit, the profit is income. Day trading is the textbook version of that intention. You're not investing for dividends or a long-term hold — you're in and out for the price move. IRD treats that gain as ordinary income, taxed at the same rates as a salary.

This applies whether you're trading shares, forex, futures, CFDs, crypto or a mix. The instrument doesn't change the answer.

How much you'll actually pay

You're taxed at your marginal rate on your total income for the year — salary, trading profit, everything combined. Here are the 2025–26 brackets:

| Income band | Rate |

|-------------|------|

| $0 – $15,600 | 10.5% |

| $15,601 – $53,500 | 17.5% |

| $53,501 – $78,100 | 30% |

| $78,101 – $180,000 | 33% |

| $180,001+ | 39% |

The important bit: your trading profit sits on top of everything else you earn, so it gets taxed in your highest bands — not the cheap ones at the bottom.

Here's what that looks like in practice. Say you earn $50,000 from a job and make $40,000 net profit day trading:

• Your salary uses up the 10.5% and most of the 17.5% band.
• Your $40k of trading profit then stacks from $50,000 up to $90,000 — so it's taxed at 17.5%, then 30%, then 33%.
• Tax on that trading slice works out to about $11,920 — an effective rate near 30%, not the 17.5% a lot of people assume.

Then there's ACC on top (more on that below), which adds roughly $668. So on $40,000 of day-trading profit, you're looking at around $12,600 to IRD and ACC combined.

Nobody enjoys seeing that number, but it's a lot easier to stomach when you've set it aside as you go rather than finding out in July.

ACC — the levy people forget

Because you're trading as a business, you're treated as self-employed, and self-employed earnings attract the ACC earners' levy. For 2025–26 that's 1.67% on your liable earnings, capped at $152,790. On $40k of trading profit, that's about $668. It's not huge, but it's real and it's separate from your income tax.

Provisional tax — the second-year surprise

This is the one that ambushes people. In your first profitable year you pay your tax as a lump sum. But if that tax bill (your "residual income tax") comes to more than $5,000, you're pushed into provisional tax for the next year.

Provisional tax means paying next year's expected tax in three instalments during the year — 28 August, 15 January and 7 May — instead of one hit at the end. Under the standard method each instalment is roughly last year's tax × 1.05, split three ways.

It's not an extra tax. It's paying in advance. But in your second year you can end up covering two years' tax in a few months if you're not ready for it, so it pays to see it coming.

What you can knock off — costs and losses

Trading as a business means your genuine costs are deductible. For a day trader that usually includes:

• Brokerage, commissions and spread costs
• Platform and charting subscriptions (MT4/MT5, TradingView, etc.)
• Market data feeds
• A share of your home office and internet
• A VPS if you run automated strategies
• Accounting fees

And losing years aren't wasted. A net trading loss can offset your other income in the same year, and any unused loss carries forward indefinitely — there's no time limit in NZ — to reduce a future year's tax. Keep the ledger; it's money.

For the full list, see the trading tax deductions guide.

Getting the numbers right — NZD and RBNZ

If you trade anything priced in a foreign currency (forex, US shares, most crypto pairs), every trade has to be converted to NZD for your return. IRD wants you using the RBNZ mid-rate on the day, not whatever rate your broker happened to show. Doing that by hand across hundreds of trades is miserable, which is exactly the kind of thing software should handle for you.

The mistakes that come up again and again

• Assuming "no CGT" means tax-free. It doesn't for traders. Different rule.
• Budgeting at the wrong rate. People set aside 17.5% because that's their salary band, then get a bill closer to 30–33% because the trading stacked on top.
• Forgetting provisional tax and ACC. Both are easy to miss in year one and both hurt in year two.
• No records. Reconstructing a year of day trades in July is a nightmare. Log as you go.

What to do next

If you're day trading and haven't sorted your tax, you're not in trouble — you just need a system before 7 July rolls around. TradeLog NZ pulls your trades together, converts everything to NZD at the RBNZ rate, and gives you the actual figures for your IR3 — profit, tax, ACC, provisional, the lot. It's free to start.

Worth reading next: the full NZ trader tax guide, and how IRD decides trader vs investor if you also hold longer-term positions.

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Do day traders pay tax in New Zealand?

Yes. Day trading profits are taxable income in New Zealand. While NZ has no general capital gains tax, profits made from buying and selling with the intention of making a profit are treated as income, and day trading is the clearest example of that intention. You declare it on your IR3 and pay tax at your marginal rate.

How much tax will I pay on day trading profits?

You pay tax at your marginal rate on your combined income for the year. Because trading profit stacks on top of any other income like a salary, it's usually taxed in your higher bands — often 30% to 33% for 2025–26 — rather than the lower rates. You'll also pay the ACC earners' levy (1.67% for 2025–26) as a self-employed person.

Can I claim day trading losses in NZ?

Yes. If you make a net loss trading, it can offset your other income in the same tax year, and any unused portion carries forward indefinitely to reduce tax in future years. You need to keep proper records of your trades and losses to claim them.

Do I have to pay provisional tax as a day trader?

You'll have to pay provisional tax if your residual income tax for the year is more than $5,000. If it is, you pay the following year's tax in three instalments (28 August, 15 January and 7 May) rather than as a single end-of-year payment.

Do I need to register for GST for day trading?

Generally no. Profit from financial trading like forex, shares and crypto is exempt from GST, and it does not count toward the $60,000 GST registration threshold. GST only becomes relevant if you earn GST-applicable income separately, such as selling courses or trading signals.

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This summary is a guide only and does not constitute formal tax advice. Individual circumstances vary and tax laws change. Review with a qualified NZ tax accountant before filing. TradeLog NZ accepts no liability for errors in your tax return. For the official rules, see ird.govt.nz.