GST is one of the main reasons a novated lease quote can be hard to reconcile from the drive-away price alone. The quote may show some numbers including GST and others after an input-tax-credit adjustment.
Vehicle price and recoverable GST
For 2026–27, the ATO states that the maximum GST credit for a car subject to the car-limit restriction is $6,353, calculated from the $69,883 car limit. ATO source — purchasing a motor vehicle.
That cap is relevant to the calculator's default GST estimate, but a real lease quote can contain settlement-specific tax treatment and non-GST components. When the provider gives an exact recoverable GST adjustment, use that figure.
Amount financed
A simplified reconciliation can look like:
vehicle price incl. GST + financed fees − GST adjustment = amount financed
But do not force this formula if the lease documents already give you the actual principal. Provider settlement figures can contain details that are not obvious from a consumer quote.
Residual including and excluding GST
An employee-facing end residual may be displayed including GST, while the finance cash-flow model uses a residual excluding GST. For a 10% GST rate:
residual ex GST = residual incl GST / 1.10
Only use that conversion if the residual is genuinely GST-inclusive under the quote.
Why this matters for the interest rate
A reverse-rate solver discounts the residual as a future cash flow. If you feed an inclusive residual into a model expecting an exclusive value, the resulting implied rate can be wrong.
The Novated Lease Interest Rate Calculator therefore makes residual GST treatment explicit and shows both values in calculation details.
Tax advice boundary
The calculator is designed to reconcile finance cash flows, not determine your personal income-tax or FBT position. For transaction-specific tax advice, use the current ATO guidance and a suitably qualified adviser.
About the author: KK Neelamraju is a finance and credit professional and an Authorised Credit Representative through GPS Finance Group.
GPS Finance Group (CRN 000575797) is an Authorised Credit Representative of AFAS Group Pty Ltd (ACL 414426). AFCA Member ID 119860. General information only. Credit approval and pricing are subject to lender assessment. Tax-sensitive information should be checked against current ATO guidance and, where appropriate, with a qualified tax adviser.
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