Pay off HELP or keep the money in your mortgage offset?

Data checked: 2026-09-07

Suppose you have a $30,000 lump sum, a mortgage with an offset account and a Higher Education Loan Program (HELP) debt. The mortgage rate is higher than the latest HELP indexation rate, so the answer can look obvious: keep the money in the offset. But the decision is not only a race between two percentages.

A voluntary HELP repayment is permanent and does not substitute for a compulsory repayment while debt remains. Clearing the whole balance before lodging a tax return is a different case, so the remaining debt and the payment-processing date matter as well. An offset balance remains accessible, but only delivers the expected benefit if it is properly linked to the mortgage and the loan’s extra fees or rate premium do not consume the saving. Timing around 1 June also matters because HELP indexation is annual rather than daily.

The useful question is therefore narrower: on the same date, what does each option do to cash cost, debt, compulsory repayments and available liquidity?

Start with the debts you actually have today

Before comparing rates, collect five current numbers:

• your HELP balance in ATO online services

• how much of that balance is old enough to be indexed on the next 1 June

• the amount you can use without breaching your emergency-cash floor

• your mortgage rate and any offset-related fee or rate premium

• the balance that your lender is actually using to calculate mortgage interest

Do not use the HELP balance from an old payslip or assume that payroll withholding has already reduced it. Compulsory repayments are calculated when you lodge your tax return. Amounts withheld by an employer are not the same thing as a voluntary repayment processed against the loan balance.

The one-off 20% reduction of eligible student debt has already been applied. It should not be modelled as a repeatable discount for a new voluntary repayment.

HELP indexation and mortgage interest run on different clocks

HELP does not charge conventional interest. Eligible debt that is more than 11 months old is indexed on 1 June. The indexation method uses the lower of the Consumer Price Index and Wage Price Index, and the rate can change each year.

Mortgage interest is usually calculated daily. A correctly linked offset account reduces the mortgage balance on which interest is charged each day. That means $30,000 kept in the offset can create a benefit from the first day, while a HELP repayment avoids indexation only when the relevant debt would otherwise be indexed.

This timing difference is why a one-year percentage comparison is only a first pass. If the next 1 June is close, repaying HELP may avoid indexation soon. If it is many months away, the offset can save mortgage interest while preserving the option to make a HELP payment later.

Compare the same lump sum over the same period

Use a common period, such as today to the next 1 June or the next 12 months. The first-pass arithmetic is simple:

offset benefit ≈ lump sum × mortgage rate × time held

HELP benefit ≈ eligible HELP amount repaid × applicable indexation rate

Assume a $30,000 lump sum, a 6% mortgage rate and an illustrative 3% HELP indexation rate. Over a full year, keeping the money in a correctly linked offset would avoid about $1,800 of mortgage interest. Repaying $30,000 of HELP before indexation would avoid about $900 of indexation. On those assumptions, the offset is ahead by about $900 before fees, rate premiums and timing.

The 3% figure is an illustration, not a forecast. In 2026 the published rate was 2.8%, but a later year’s rate can differ. Replace it with the official rate once it is available, and model only the part of the HELP balance eligible for indexation.

A higher mortgage rate does not settle every case

If the mortgage rate exceeds expected HELP indexation, the offset normally has the stronger direct dollar return. But four conditions can change that conclusion.

First, compare only costs that differ between the options. A package fee or rate premium reduces the offset’s advantage if choosing the alternative would actually avoid that cost; an existing mortgage package does not become free just because you pay HELP. Second, the account has to be linked to the intended loan. Moneysmart warns that linkage failures can leave borrowers paying more interest without an obvious change in the scheduled repayment.

Third, behaviour matters. An offset is liquid. That is valuable if the money is an emergency reserve, but it also means the balance can be spent. A HELP repayment removes that temptation because it cannot be reversed.

Fourth, debt age matters. A recent HELP amount that is not yet 11 months old may not be indexed on the next 1 June. Paying that portion early produces less immediate indexation benefit than a headline balance comparison suggests.

Partial payments and full payoff have different tax outcomes

For 2026–27, compulsory HELP repayments begin above repayment income of $69,528 and use a marginal formula, meaning the rate applies only to income above the threshold, subject to the official cap. The ATO calculates the amount when the tax return is lodged.

A voluntary payment reduces the loan balance once processed; it is not a credit against the income-based compulsory-repayment calculation. If debt remains, an additional compulsory repayment may still be required. This creates a cash-flow trap when someone makes a large partial payment and assumes it has also settled the amount due through the tax system.

Full repayment needs a separate check. The ATO’s voluntary-repayment guidance advises having the full payment credited before lodging the tax return, because lodging first may put a compulsory repayment on the notice of assessment. Confirm both the remaining loan balance and any amount already assessed before treating the debt as finished. Do not budget a second full repayment on a loan that has already been cleared, or assume that paying the loan account cancels an existing tax bill.

Before using the whole lump sum, estimate the tax-year obligation separately. Check whether employer withholding is likely to cover it and leave room for any assessment difference. Keep payroll withholding separate from cash already applied to HELP. If the loan has been fully repaid, withholding already collected is reconciled through the tax return; the final refund or amount owing also depends on other tax liabilities. StudyAssist’s repayment FAQs explain this distinction and how to notify an employer once the debt is repaid.

Waiting until May can preserve an option, but it has a cost

There are three practical paths:

• keep the entire lump sum in the offset

• make a voluntary HELP repayment now

• keep the money in the offset, then reconsider before the next 1 June

The third path can preserve liquidity and mortgage interest savings for most of the year. Its cost is that HELP remains exposed to the next indexation event until the payment is processed. It also requires discipline and enough processing time.

StudyAssist says a voluntary repayment should be made early enough to be received and processed before 1 June. Published guidance has used a four- or five-business-day allowance, but a prudent plan should check the current deadline rather than relying on last year’s calendar.

Waiting is therefore not a free option. It is a deliberate choice to keep liquidity and offset benefit while accepting timing risk. Set a calendar reminder well before late May, then recheck the official rate, balance and payment instructions.

Separate liquidity from the return comparison

Money in a genuine offset remains available for a repair, medical bill , job loss or home purchase cost. Money paid to HELP is non-refundable. If making the repayment would force you to use a credit card or personal loan after a shock, the expensive replacement debt can overwhelm the indexation saving.

Set a minimum cash reserve before comparing the two debts. Only the amount above that floor belongs in the decision worksheet. A household with variable income or a near-term renovation may assign more value to liquidity than a household with stable income and a separate reserve.

If you use an offset, verify it rather than assuming it works. Check the linked loan in online banking, compare the interest calculation with statements and recheck the link after refinancing or switching products. Mortgage offset after refinancing explains that control in detail.

For a pure offset-versus-savings comparison, including tax and package costs, see Offset account versus savings after tax .

Do not promise yourself a borrowing-capacity result

People often consider paying HELP before applying for a mortgage because the compulsory repayment can affect household cash flow. Removing the balance may change a lender’s assessment, but the effect is not a fixed multiple of the amount repaid.

Lenders assess income, living expenses, other debts, buffers and their own policies. The timing of the application and tax assessment also matters. Ask the lender or broker for a written scenario using the same application inputs: one with the current HELP balance and one after full repayment. Do not spend the lump sum on the assumption that borrowing capacity will rise by a specific amount.

If the goal is a home purchase rather than minimising debt cost, deposit size and accessible cash may matter as much as HELP. That makes the offset or a cash account more valuable until finance is approved and settlement costs are known.

Use a three-path worksheet before acting

Complete this table on one date. Do not mix today’s mortgage rate with last year’s HELP rate or a future balance estimate. For the cash-access row, start with all accessible cash, including your emergency reserve, and subtract only the HELP payment actually made. The interest-benefit rows compare only the amount being considered for repayment.

The offset is the stronger candidate when its net mortgage benefit is higher, the account is verified, and liquidity still has a job. Paying HELP is stronger when indexation is close, the relevant balance is eligible, the offset advantage is small after costs, and the cash is genuinely surplus. Waiting until May is stronger when the timing option is valuable and you can execute well before the processing deadline.

The decision changes when any of four inputs changes

Recalculate rather than defend the old answer when:

• the mortgage rate or offset package cost changes

• the official HELP indexation rate becomes available

• the amount of HELP old enough for indexation changes

• your emergency reserve, home purchase or lending plan changes

There is no universal rule that HELP is always the cheapest debt to keep or that all debt should be cleared before holding cash. The right comparison is the one that uses the same dollar, the same date and the real constraints of the household.

This article provides general information only and is not personal financial, tax or legal advice. It does not recommend a lender, mortgage product or repayment strategy. The operator or author may directly or indirectly hold or use financial products discussed in this article. This article was not commissioned or sponsored by a lender, broker, comparison service or education provider, and it contains no affiliate or referral links. Display advertising does not determine editorial judgement. Check current ATO, StudyAssist and lender information and consider qualified advice before making an irreversible repayment.

Sources checked

• StudyAssist, Loan repayments

• StudyAssist, Indexation and loan increases

• Department of Education, HELP indexation and debt reduction

• Moneysmart, Mortgage offset accounts

• Australian Taxation Office, Study and training loans

• StudyAssist, 2026 HELP indexation rate