A quarterly rate change can alter the cost of waiting.

Check the quarter that applies to your debt

Use the official ATO general interest charge rate table for each period. This page does not publish an unverified current-quarter rate. A rate from a prior quarter should not be assumed to apply to today’s debt.

For illustration only, $100,000 at a hypothetical 10% annual daily-compounding rate accrues about $825 over 30 days with no payments. That is not the current ATO rate, a balance calculation or a lending quote.

GIC is interest on certain unpaid tax liabilities

The Australian Taxation Office applies the general interest charge to certain unpaid tax amounts. It is generally calculated daily on the unpaid amount and compounds daily. The published annual rate changes each quarter.

A payment plan does not generally stop GIC from accruing on an unpaid balance. Paying down the principal can reduce the balance on which future interest is calculated. Check your ATO statement and the official rate for the relevant period.

An estimate is a starting point, not your actual ATO balance

A simple calculator cannot account for every adjustment, tax type, payment date or remission decision. Your actual statement remains the source of truth. Our calculator lets you enter a rate rather than assuming an unverified current rate.

If comparing with finance, include establishment fees, broker fees, repayment timing and the loan term. A lower monthly repayment can conceal a higher total cost. Ask your accountant about tax treatment and whether remission may be available in your circumstances.

Check every quarter covered by the calculation

If the unpaid period spans a quarter boundary, use the rate for each relevant period rather than applying today’s rate to the entire history. Save the rate table reference alongside your assumptions.

A published rate is not your personalised account balance. Payment dates, adjustments and any confirmed remission still need to be reconciled against the actual statement.

Why the rate changes every quarter

The GIC rate is not fixed for the year. The ATO reviews and publishes a new rate each quarter, which means the cost of carrying a tax debt can rise or fall depending on broader interest rate conditions. Businesses that check a GIC rate once and assume it applies indefinitely can significantly misjudge the cost of leaving a debt unpaid for several quarters.

Always check the ATO’s own published table for the quarter that actually applies to the period you are calculating. This article will not publish a specific current-quarter figure, because by the time you read it the rate may have changed — relying on a number from an article rather than the ATO’s live table is a common and avoidable error.

Why "waiting it out" rarely improves your position

Some owners delay dealing with a tax debt because trading conditions are tight and they hope the next quarter will be easier. The problem is that GIC keeps compounding daily regardless of whether the rate changes, and new BAS or PAYG withholding obligations keep adding to the pile if trading continues. A debt that felt manageable three quarters ago can be materially larger today purely from compounding, even before considering any new liabilities.

This does not mean every business should borrow immediately — it means the true cost of delay should be measured, not assumed. Ask your accountant to model the balance forward a few quarters using the ATO’s published rate, so "waiting" becomes a quantified decision rather than a default one.

A hypothetical cost illustration (not the current rate)

To show the mechanism only — not to estimate your actual liability — assume a $100,000 debt and a hypothetical annual GIC rate of 10%, compounding daily, with no payments made. Over 30 days this would accrue roughly $825 in interest. Over a full 90-day quarter with no payments, the accrued interest would be a few thousand dollars, compounding slightly faster than a simple straight-line estimate because each day’s interest adds to the base for the next day.

These numbers are illustrative only. The actual rate for any quarter may be higher or lower, and your real balance may include multiple tax periods with different start dates, so the true figure will differ from this example. Use the official rate table and your own balance details, ideally with your accountant, to get an accurate number.

What changes when the quarterly rate moves

When the rate rises, any unpaid balance becomes more expensive to carry from that quarter onward — it does not retrospectively reprice interest already accrued at the old rate. When the rate falls, carrying an existing balance becomes relatively cheaper, but that is not a reason to stop actively paying it down, since further liabilities, penalties or ATO recovery action can still occur regardless of the rate level.

Owners comparing a payment plan against external finance should re-check the rate each time they revisit the decision, rather than relying on a comparison done months earlier. Loan quotes also age — a quote obtained at the start of one quarter may not reflect current lender pricing by the time you are ready to sign.

Checklist: before you assume you know the rate

• Check the ATO’s published GIC rate table for the exact quarter the debt falls in.
• Confirm whether your balance spans more than one quarter, since different rates may apply to different periods.
• Recalculate rather than reuse a quote or estimate that is more than a few weeks old.
• Ask your accountant whether any part of the balance is shortfall interest charge (SIC) rather than GIC.
• Remember GIC incurred from 1 July 2025 is not deductible, which affects the true after-tax cost comparison.

Common mistakes when checking the GIC rate

A frequent mistake is quoting last quarter’s rate as if it still applies — the rate is reviewed every quarter and can move in either direction. Another is applying a single annual rate as a flat percentage to the full balance, ignoring daily compounding and the fact that payments made during the period reduce the base that interest is calculated on.

A third mistake is assuming the quarterly rate is the only cost. Failure-to-lodge penalties, separate SIC calculations on amended assessments, and new liabilities accruing during the same period can all sit alongside GIC on the one account, so the rate alone does not tell you the full cost of the debt.

Questions owners ask

Where do I find the actual current rate? Use the ATO’s published general interest charge rate table, which lists the rate for the current quarter and historical quarters — do not rely on a figure quoted in a blog article or a quote from several months ago.

Does the rate apply retroactively to older debt? Generally the rate that applied during a particular period is used for the interest accrued in that period; a new quarterly rate applies going forward, not backward, to the days already passed.

If the rate drops, should I slow down my repayments? Not necessarily. A lower rate reduces the cost of carrying the debt but does not remove the debt, and the ATO can still take recovery action on an unpaid balance regardless of the rate level.

Can I lock in today’s rate for future quarters? No — the ATO rate is reviewed and published quarterly and is outside your control; what you can control is how quickly the balance is paid down.

How the rate interacts with your finance options

The quarterly GIC rate is one input into a much bigger decision about how to deal with an ATO balance. If the rate is relatively high, the gap between leaving a debt on GIC and refinancing it into a structured loan can narrow, depending on the loan’s own rate and fees. If the rate is relatively low, continuing with the ATO (via a payment plan, for example) may look more attractive on paper, though recovery risk and penalty exposure are separate considerations that do not disappear just because the rate is modest.

Whichever direction you lean towards, get an actual loan quote with its full fee schedule rather than comparing a published GIC rate to a lender’s advertised headline rate — the two are not calculated the same way, and a side-by-side comparison only works once both figures are on an equivalent, fully loaded basis.

Why the rate affects different industries differently

A business with strong, predictable cash flow can often absorb a quarter or two of a higher GIC rate without much disruption, simply by paying the balance down faster. A business in a more seasonal or cyclical sector — agriculture, tourism-linked hospitality, or project-based construction, for example — may find that a higher rate coincides with exactly the part of its cycle when cash is tightest, making the compounding effect feel more severe even though the mechanism is identical.

If your industry has predictable quiet periods, it is worth checking the GIC rate and your balance position ahead of those periods specifically, rather than only reviewing it when a problem has already emerged.

Keeping a record of the rate and your balance over time

Because the rate changes quarterly and GIC compounds daily, a simple running record makes it much easier to understand your own trend rather than relying on memory.

• Note the ATO’s published rate for each quarter your debt has been outstanding.
• Keep each quarterly statement of account so you can see how the balance has actually moved.
• Record the dates and amounts of any payments made against the balance.
• Keep any loan quotes obtained, with the date they were issued, since lender pricing can also change over time.

Warning signs it may be time for more than a rate check

Checking the quarterly rate is a useful habit, but it is not a substitute for recognising when the underlying problem has outgrown a simple interest comparison. If the balance keeps growing despite regular payments, if new BAS or PAYG withholding liabilities keep adding to the total each quarter, or if you are relying on one part of the business to cover shortfalls in another, it is worth raising solvency as a topic with your accountant rather than only tracking the rate.

These signs do not automatically mean formal insolvency advice is needed, but they are the kind of pattern that should prompt a broader conversation sooner rather than later, including whether a restructuring practitioner should be involved.

Why dates and payment allocation change the result

Two businesses with the same opening debt can incur different interest if they pay on different dates. Daily compounding means the unpaid balance matters each day, not just at month end. A rate change between quarters also changes the calculation. An annual rate multiplied by the opening debt is therefore only a rough guide, not a reconstruction of an ATO account.

Gather the statement periods, payment dates, credits and adjustments before trying to reconcile the balance. If a calculator assumes equal principal reductions, check whether the actual arrangement follows that pattern. Ask your accountant about discrepancies instead of treating a simplified estimate as an amount the ATO must accept.

The tax treatment changed from 1 July 2025

The ATO states that GIC and shortfall interest charge incurred on or after 1 July 2025 are no longer deductible. The date the interest is incurred matters, including where the underlying tax liability relates to an earlier year. Do not reuse a historic comparison that assumes all ATO interest reduces taxable income.

That change does not mean every alternative loan is deductible, or that finance automatically saves money. The use of the funds and your circumstances affect the treatment of loan interest and fees. Have your accountant check the tax assumptions separately from the lender quote; this website’s calculator excludes tax effects.

Make a like-for-like cost comparison

Use the same debt, a realistic payment timeline and every compulsory fee. Record whether a loan rate is fixed or variable and whether quoted costs include establishment, ongoing, legal or valuation charges. Include early payout conditions if you expect to repay sooner. A lower repayment is not the same as lower interest or lower total cost.

Consider non-price risks too. A secured loan may expose property; an unsecured facility can still carry guarantees and business asset security. If requesting interest remission, do not deduct hoped-for relief from the debt until the ATO has confirmed it. Borrowing should be evaluated against the actual liability and a sustainable operating forecast.