Is a PIE savings account better than a bank savings account?

It depends on the gap between your PIR and your marginal tax rate. On the worked example, $30,000.00 at 2.50% in a PIE taxed at a 28% PIR nets $540.00, while the same rate in a bank account taxed at a 33% marginal rate nets $502.50. The PIE is ahead by $37.50 a year on identical headline rates. If your marginal rate is 28% or below there is no advantage at all, because the PIR cap is the entire mechanism.

Why does a PIE pay more when the rate is the same?

Because the prescribed investor rate is capped at 28% while marginal income tax rates go to 39%. A 33% taxpayer holding an ordinary savings account pays 33% on the interest. The same person in a PIE pays 28%. The investment is identical and the return before tax is identical; only the rate applied to it differs, and that difference is worth 5 percentage points of the interest earned.

What bank rate would I need to match a PIE?

On the worked example, 2.69%. A PIE paying 2.50% taxed at 28% nets 1.80% after tax. To net the same 1.80% from a bank account taxed at 33%, the bank would have to pay 2.69%. That is the number to carry into a rate comparison, because comparing advertised rates directly will consistently mislead you in favour of the bank account.

Does a PIE help if I am on a low tax rate?

No. Someone on a 17.5% marginal rate will have a 17.5% PIR, so both accounts are taxed identically and there is no advantage from the wrapper at all. On the worked example at that combination, both net $618.75 on $30,000.00. The PIE structure only helps where your marginal rate exceeds your PIR, which in practice means taxpayers on 30%, 33% or 39%. Below that, choose purely on the headline rate and the terms.

How much is the PIE advantage worth at the top tax rate?

On the worked example, $82.50 a year on $30,000.00 for someone on a 39% marginal rate with a 28% PIR. That is a difference of 11 percentage points on the interest, which is the largest gap available under the current rate structure. Expressed as an effective rate, the PIE nets 1.80% against the bank account's 1.53% on identical headline rates.

Is my PIR the same as my tax rate?

No, and confusing them is a common and costly error. The PIR is worked out from your income across the last two years, using both your taxable income and your PIE income, and it is capped at 28%. The rates are 10.5%, 17.5% and 28% only. Your marginal income tax rate has more brackets and rises to 39%. Getting your PIR wrong means either overpaying or underpaying tax, and both are corrected at year end.

Is a PIE savings account as safe as a bank account?

They are different legal structures and the comparison is not purely about tax. A bank deposit is a debt owed to you by the bank. A PIE is a managed fund in which you hold units, and what it invests in determines the risk. A PIE savings product holding bank deposits and short-term instruments is low risk but not identical to a deposit. Check what the fund actually holds and read the product disclosure statement rather than assuming equivalence.

Does the deposit compensation scheme change the comparison?

It can, and it is worth checking rather than assuming. New Zealand has introduced a depositor compensation scheme covering eligible deposits at licensed deposit takers up to a per-depositor limit. Whether a particular PIE savings product is covered depends on its structure and on where the underlying money sits. Since coverage and limits have changed recently, confirm the current position with the provider and with the Reserve Bank before treating the two options as equivalent on safety.

PIE Savings vs Bank Savings Calculator

Quick answer: On the worked example below, $30,000.00 at 2.50% nets $540.00 in a PIE taxed at a 28% PIR and $502.50 in a bank account taxed at a 33% marginal rate. Identical headline rate, $37.50 a year difference. A bank account would need to pay 2.69% to match the PIE. If your marginal rate is 28% or below, the advantage disappears entirely.

Savings accounts are advertised at a rate before tax, which makes two products taxed under different regimes look directly comparable when they are not. An ordinary bank savings account pays interest taxed at your marginal rate through resident withholding tax, which for a working New Zealander is commonly 30, 33 or 39 percent. A portfolio investment entity savings product pays income taxed at your prescribed investor rate, and that rate is capped at 28 percent no matter how much you earn. The investment can be economically identical and the advertised rate identical, and you will still end up with different amounts of money. This page does the only comparison that matters, which is the after-tax one, and it reports the result three ways: the interest each account actually pays you, the effective after-tax rate on each, and the rate a bank account would have to advertise to leave you equally well off. That last figure is the useful one to carry into a rate comparison table. It also shows the whole grid of PIR and marginal rate combinations, because the advantage is not universal: for anyone whose marginal rate is at or below their PIR the wrapper does nothing at all, and knowing that saves you chasing a benefit you cannot receive.

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Updated August 2026 Current 2026/27 rates applied.

Tax is not the only difference between these two products. A bank deposit is a debt the bank owes you. A PIE is a managed fund in which you hold units, and its risk depends on what it actually invests in. A PIE savings product holding bank deposits and short-term instruments is low risk, but it is not legally identical to a deposit, and depositor compensation arrangements may apply differently. Read the product disclosure statement and check the current compensation position with the provider rather than assuming the two are equivalent on anything other than the tax treatment modelled here.

Verification & Methodology

PIE after-tax interest = balance × PIE rate × (1 − PIR).
Bank after-tax interest = balance × bank rate × (1 − marginal rate). Interest from a bank account is taxed at your marginal rate via resident withholding tax.
Effective after-tax rate = after-tax interest / balance, which is what you can genuinely compare between the two.
Matching bank rate = PIE rate × (1 − PIR) / (1 − marginal rate). This is the advertised bank rate that produces the same after-tax result.
Prescribed investor rates are 10.5%, 17.5% and 28%, determined from your income over the last two years. The 28% cap is the entire source of the advantage: where your marginal rate is at or below your PIR there is none.
The PIR test uses both your taxable income and your PIE income across the two prior years. Our PIR rate calculator works it out properly; this page takes the rate as an input.
Simple interest for one year is assumed, with no compounding and no contributions. Both products compound identically so the comparison is unaffected, though the dollar figures would be slightly higher.
Excluded: account fees, minimum balances, notice periods and any bonus-rate conditions, all of which can outweigh the tax difference on smaller balances.
Not tax or financial advice. Last verified: August 2026.

Your savings Balance

The two accounts PIE savings rate

% p.a.

Bank savings rate

% p.a.

Both advertised before tax, which is why they cannot be compared directly.

Your tax rates Prescribed investor rate (PIR) Capped at 28%. Based on your income over the last two years. Marginal income tax rate Applies to bank interest through resident withholding tax.

$37.50

a year better in the PIE

PIE nets

$540.00

1.80% after tax

Bank nets

$502.50

1.68% after tax

Difference

$37.50

a year

Bank would need

2.69%

to match the PIE

What each account actually pays

Account	Rate	Interest	Tax rate	Tax	After tax
PIE savings	2.5%	$750.00	28%	$210.00	$540.00
Bank savings	2.5%	$750.00	33%	$247.50	$502.50

Identical investment, identical headline rate, different tax regime. The only thing separating the two figures is the rate applied to the interest.

The comparison that matters

Effective after-tax rate, PIE	1.80%
Effective after-tax rate, bank	1.68%
Difference in after-tax rate	0.13%
Extra interest a year on $30,000.00	$37.50
Bank rate needed to match a 2.5% PIE	2.69%
Which is higher than the PIE rate by	0.19%

Carry the matching rate into any comparison table. Comparing advertised rates directly consistently favours the bank account by the size of the tax gap.

Where the advantage exists, and where it does not

PIR	Marginal rate	PIE nets	Bank nets	PIE advantage
10.5%	10.5%	$671.25	$671.25	$0.00
17.5%	17.5%	$618.75	$618.75	$0.00
28%	30%	$540.00	$525.00	$15.00
28%	33%	$540.00	$502.50	$37.50
28%	39%	$540.00	$457.50	$82.50

Assumes both accounts pay the same headline rate. The advantage exists only where your marginal rate exceeds your PIR, and grows with the gap.

Advertised Rates Are Not Comparable

Every savings rate you see quoted is a before-tax number. That is fine when comparing two bank accounts, because both are taxed the same way. It is misleading the moment one of the options is a PIE, because the tax applied to it is capped at a rate lower than most working people's marginal rate.

On the worked example both accounts advertise 2.50%. One pays you $540.00 and the other pays you $502.50. Nothing about the investment differs; only the tax regime does.

Worked Example: $30,000 At 2.50%

Both accounts earn $750.00 of interest in the year.

The PIE is taxed at your 28% prescribed investor rate, which is $210.00, leaving $540.00. That is an effective after-tax rate of 1.80%.

The bank account is taxed at your 33% marginal rate through resident withholding tax, which is $247.50, leaving $502.50. That is an effective 1.68%.

The PIE is ahead by $37.50 a year, which is 0.13% of the balance, on identical headline rates.

The Number To Carry Into A Comparison

The most useful output here is the matching rate. To leave a 33% taxpayer as well off as a 2.50% PIE, a bank account would have to advertise 2.69%.

That is 0.19 percentage points above the PIE's headline rate, and it means a bank account advertising 2.60% is worse than a PIE advertising 2.50%, despite looking better in every comparison table.

At a 39% marginal rate the required bank rate rises further still. Whenever you are comparing savings rates and one option is a PIE, convert before you compare.

It Does Nothing For Everyone

The advantage comes entirely from the 28% cap, so it exists only where your marginal rate exceeds your PIR.

Someone on a 17.5% marginal rate will have a 17.5% PIR. Both accounts are taxed identically and both net $618.75. The wrapper is irrelevant, and choosing a PIE for tax reasons at that income is chasing a benefit that does not exist. Choose on the rate, the fees and the access terms instead.

At 30% the advantage is a modest $15.00 a year. At 33% it is $37.50. At 39% it is $82.50, which is the largest gap the current rate structure allows.

Knowing which side of that line you sit on is worth more than the arithmetic. Our PIR rate calculator establishes your PIR from the actual test, and our marginal tax rate calculator confirms the other half.

Do Not Assume Your PIR

The PIR is not your income tax rate and it is not a rate you choose. It is determined from both your taxable income and your PIE income across the previous two years, and it takes only three values: 10.5%, 17.5% and 28%.

Getting it wrong has consequences in both directions. Too high and you overpay during the year, though the end-of-year assessment now returns it. Too low and you owe the shortfall. Our PIR overpayment recovery calculator works out what a wrong rate has cost and what happens to it.

Tax Is Not The Whole Comparison

Three things can outweigh a $37.50 annual tax advantage, particularly on smaller balances.

Fees. A monthly account fee of $5 costs $60 a year and reverses the entire advantage.

Access. If one account requires notice to withdraw and the other does not, that difference matters more than the tax for money you may need quickly. Our emergency fund placement calculator weighs access against yield directly.

What it actually holds. A bank deposit is a debt owed to you by the bank. A PIE is a fund holding assets, and while a PIE savings product typically holds deposits and short-term instruments, it is a different legal structure with a different risk and compensation position. That is worth understanding before treating them as interchangeable.

And Whether Cash Is The Right Place At All

This page compares two ways of holding cash. It does not ask whether the money should be in cash, which for anything beyond an emergency fund and known near-term spending is usually the larger question.

An after-tax return of 1.80% against inflation is a real return that may well be negative. Our cash drag calculator quantifies what holding cash costs against an invested alternative, and our savings to investment switch calculator addresses the horizon at which moving makes sense.

Related NZ Savings and PIE Tax Calculators

PIE PIR Rate Calculator: work out your correct prescribed investor rate.
PIR Overpayment Recovery Calculator: what a wrong PIR has cost you.
Term Deposit vs PIE Fund Calculator: the same comparison for term deposits.
Emergency Fund Placement Calculator: yield against access and tax.
RWT on Interest Calculator: resident withholding tax on bank interest.
Reading Your Bank Statement: background on this topic.

Data sources: the rates and thresholds on this page are maintained against Inland Revenue. Figures are checked twice monthly.

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