How High-Interest Savings Account Interest Is Taxed

High-interest savings account interest receives no special tax treatment in Australia. Unlike capital gains on assets held longer than 12 months (which get a 50% discount) or superannuation earnings (taxed at 15%), savings account interest is fully assessable and taxed at your marginal income tax rate. This means every dollar of interest you earn is added to your salary, business income, and other earnings, then taxed as if it were any other form of income.

Your bank or credit union is legally required to report your interest earnings to the ATO each financial year. This is done through the Annual Investment Income Report (AIIR) system. The ATO then cross-checks this data against the interest you declare in your tax return, making it essential to report the correct amount. Banks also provide you with an annual statement showing the total interest credited to your account from 1 July to 30 June.

The timing of when interest is credited matters. Most high-interest savings accounts calculate interest daily and credit it to your account monthly. The interest that is credited between 1 July and 30 June is declared in that financial year's return, regardless of when the underlying funds were deposited. If you opened a high-interest account in May 2026 but the first interest payment lands in July 2026, that interest belongs to the FY 2026-27 tax year instead.

FY 2025-26 Tax Rates on Savings Account Interest

The Stage 3 tax cuts are fully in effect for FY 2025-26, meaning the tax brackets are now 0%, 16%, 30%, 37%, and 45%. The following table shows how much tax you would pay on typical savings account interest amounts depending on your marginal rate.

The Medicare levy of 2% is also applied to most taxpayers, which adds another layer of tax on your interest income. For a high-income earner on the 45% bracket, the combined rate is 47%, meaning nearly half of your savings account interest goes to tax. Lower-income earners may be exempt from the Medicare levy if their income is below the threshold of $27,222 for singles.

The Low Income Tax Offset (LITO) can provide some relief if your total taxable income (including savings interest) is below $66,667. The maximum offset of $700 phases in from $37,500 and is completely gone by $66,667. This effectively reduces the tax paid on interest for low to middle-income earners. For example, someone earning $40,000 would have a marginal rate of 16% but the LITO reduces the effective rate on the first portion above $18,200.

Is the Bonus Interest Rate Taxed Differently?

Many high-interest savings accounts in Australia offer a "bonus" or "honeymoon" interest rate that is higher than the base rate for a promotional period or if certain conditions are met (such as depositing a minimum amount each month). From a tax perspective, there is no difference between the base interest and the bonus interest. All interest earned on the account, regardless of the rate tier, is fully assessable and taxed at your marginal rate.

Some banks structure their bonus interest as separate payments or display it separately on statements, but the ATO treats it identically. Your annual statement will show the total interest paid across all rate tiers combined. You simply report that single total figure in your tax return. There is no need to separate base interest from bonus interest when lodging your return.

Do You Need to Pay PAYG Instalments on Savings Account Interest?

If your investment income — including savings account interest, term deposit interest, dividends, and rental income — exceeds $4,000 in a financial year, the ATO may require you to pay Pay As You Go (PAYG) instalments. This is a system where you pay quarterly instalments toward your expected tax bill, rather than a single lump sum at tax time. The ATO will notify you if you need to enter the PAYG instalment system.

PAYG instalments are not an additional tax — they are simply prepayments against your expected tax liability. When you lodge your annual tax return, the instalments you have paid are credited against your calculated tax. If you overpay, you receive a refund. If you underpay, you owe the difference. This can be useful for people with significant savings account interest because it avoids a large tax bill at the end of the year.

You can choose to have the ATO calculate your instalment amount based on your previous year's investment income, or you can vary the amount if you expect your income to be significantly different. Use the take-home pay calculator to estimate your total tax, including savings interest, so you know whether PAYG instalments might apply to you.

Joint Savings Accounts — How Interest Is Split for Tax Purposes

If you hold a high-interest savings account jointly with your spouse or partner, the interest is generally split according to the ownership share. For most standard joint accounts with equal ownership, each person declares 50% of the total interest. This is particularly relevant if one partner has a lower marginal tax rate, as splitting the interest between two people can reduce the overall family tax bill.

However, the ATO applies the "income splitting" rules strictly. If one partner deposits all the funds but the account is jointly held, the ATO may still attribute the interest to the person who contributed the money. To legitimately split interest income, both partners should genuinely contribute to the account. Accounts held in a sole name cannot be split for tax purposes, even if the funds are used for joint household expenses.

For parents opening savings accounts for their children, the minor tax rates apply. Children under 18 generally pay tax on unearned income (including interest) at penalty rates — up to 66% — unless the income is from a deceased estate or a special disability trust. This means holding large savings accounts in a child's name may result in a higher tax bill, not a lower one. The first $416 of the child's unearned income is tax-free, but amounts above that are taxed at much higher rates.

Strategies to Reduce Tax on High-Interest Savings Account Interest

Since savings account interest is fully taxable, there are limited options to avoid it entirely, but some strategies can reduce the impact. The most effective approach is to consider whether your savings should be in a different structure, such as superannuation, where earnings are taxed at only 15% (or 0% in the pension phase). This is particularly beneficial for long-term savings that you do not need to access before retirement.

Another option is tax-effective investing through shares with franking credits. Dividend income from Australian shares often comes with franking credits that represent tax already paid by the company, which can reduce your overall tax liability. However, this involves higher risk compared to a savings account. Use the superannuation calculator to compare the long-term outcomes of saving within super versus a high-interest account.

For money you need in the short to medium term (under five years), a high-interest savings account or term deposit is usually the most appropriate option despite the full tax liability. The tax is simply a cost of having accessible, low-risk savings. If you have a HECS-HELP debt, consider that additional interest income may increase your compulsory repayment amount. Use the HECS repayment calculator to see how extra interest affects your student loan repayments.

Frequently Asked Questions

Is there a tax-free threshold for savings account interest?

There is no specific tax-free threshold for interest income. However, the general tax-free threshold of $18,200 applies to all income combined. If your total income (salary plus savings interest) is below $18,200, you pay no tax. If you are a senior or pensioner, the SAPTO effectively raises this threshold further.

Does the ATO automatically know my savings account interest?

Yes. Australian banks and credit unions report your interest earnings to the ATO each year through the Annual Investment Income Report system. Your interest figure often appears pre-filled in your myTax return. You should still verify the amount and add any interest from accounts not covered by the pre-fill data, such as some smaller credit unions or overseas accounts.

Do I need to pay tax on interest if I close my savings account mid-year?

Yes. Any interest credited to your account before you close it is taxable in that financial year. Even if the account is closed and no longer active, the bank will report the interest paid up to the closure date. You must include this figure in your tax return for that year.

How is interest from an introductory bonus rate taxed?

Exactly the same as regular interest. The bonus or promotional rate interest is fully assessable income and taxed at your marginal rate. Your bank reports the total interest paid across all rate tiers as a single figure. You do not need to separate base interest from bonus interest when reporting to the ATO.

Can I claim bank fees as a deduction against savings account interest?

Generally, no. Account-keeping fees on a personal savings account are not deductible because they are considered a private expense. However, if you have a separate investment account used for trading shares, managed funds, or rental property, the fees on that account may be deductible against the associated investment income. It is best to keep personal savings accounts separate from investment accounts for clearer tax record-keeping.