Brokerage Fee Calculator NZ
This calculator shows how much brokerage and transaction fees really cost when you buy and sell shares or funds in New Zealand, and why those fees can quietly eat into returns on smaller or more frequent trades. You enter your typical trade size, the flat fee your platform charges per trade, the percentage fee it applies, and how many trades you make in a year. The calculator doubles the fee to cover both the buy and the sell side of a round trip, then works out the total cost as a percentage of your trade. It returns the fee per trade in dollars, the break-even rise needed, which is how far the investment must climb just to cover both fees before you make any profit, and your estimated fees for the year based on how often you trade. Use it to compare platforms with different fee structures, to check whether a flat fee or a percentage fee suits your usual trade size better, and to see why investing larger amounts less often is often more fee-efficient than frequent small top-ups. It is especially useful before committing to a share trading or investment platform, since fee structures vary widely and a fee that looks small in dollar terms can be a large share of a modest trade. This is an estimate to guide your comparison, not financial advice.
The break-even rise is how much the investment must gain just to cover buying and selling fees before any profit. Fee structures vary widely between platforms, so compare flat fees and percentage fees for your typical trade size. Estimate only, not financial advice.
How it works
The fee on a trade is the flat fee plus the percentage fee applied to the trade size. To complete a round trip you pay this on the way in and again on the way out, so the calculator doubles it to show the total buy and sell cost as a percentage of your trade. The break-even rise is that round-trip cost expressed as the gain needed just to cover fees. Multiplying the per-trade fee by your trades per year shows your annual fee bill.
Worked example
A $1,000 trade with a $3 flat fee and a 0.5% fee costs $8 each way, so $16 to buy and sell, which is 1.6% of the trade. The investment must rise 1.6% just to break even. On a $5,000 trade the same fees would be far smaller as a percentage, which is why larger, less frequent trades are more fee-efficient.
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