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nguyen50(I'm new)I'm new
14 May 2026

Hi ATO Community,

I am seeking guidance on the correct apportionment and record-keeping for a mixed-purpose Principal and Interest (P&I) loan used to fund a partial deposit for a new investment property.

The Scenario:

  • Existing Loan: I have a single P&I loan account (originally for Investment Property A).
  • New Investment (Property B): I am purchasing a second investment property. The 20% deposit for this property is over $200,000.
  • Drawdowns: To help fund this deposit, I made 7 separate drawdowns (due to staged payment needs or daily transaction limit) from my existing loan account over a 32-day period (23 Jan to 24 Feb), totaling $86,650.35.
  • Settlement: Property B settled on 26 February 2026 and was immediately available for rent.

Questions:

  • Q1. Simplification of Drawdowns: Given the 7 drawdowns occurred within a 32-day window for the same purpose, is it acceptable to treat the total $86,650.35 as a single "Portion B" for interest calculations? Or does the ATO require a daily weighted calculation for each specific drawdown date?
  • Q2. Pre-Settlement Interest: For deposit payments made before settlement, is the interest incurred between the drawdown date and the settlement date (26 Feb) immediately deductible, or must it be capitalized into the cost base of Property B?
  • Q3. P&I Principal Reductions: As this is a P&I loan, (a) am I required under TR 2000/2 to reduce the "Property B" portion of the debt proportionately every month as the total loan principal reduces, and (b) is a spreadsheet-based sub-ledger sufficient documentation for this?

I want to ensure my tracking is compliant while keeping the calculations as streamlined as possible. Any advice on the "best practice" for managing these drawdowns would be greatly appreciated.

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2 replies
33 views
2 replies

Most helpful response

Most helpful reply

YellowPotato(Taxicorn)Taxicorn
15 May 2026

Q1, You can follow ATO's apportionment calculation. More Simple

Q2 - Generally, property would need to used to be produce income to be able to claim deduction. If it's a non-deductible cost generally go into cost base,

Q3 - Regular and additional repayments need to be apportion (paragraph 16). Exception would be when you sell the asset itself (paragraph 17)

All replies

14 May 2026

Q1 - appropriate practice is to apportion for the different drawdowns. Excel should do this fairly easily and it's just for this one year - going forward you will just have a part A and Part B to your loan apportionment. Whether anyone would be fussed if you don't do it and got audited - probably not given the amounts involved.


Q2 - interest incurred before the property was available for rent does need to be capitalised into the cost base


Q3 - yes, proportionate reductions to capital is the appropriate (and required) treatment and an Excel calculation of the split is going to be fine

Most helpful reply

YellowPotato(Taxicorn)Taxicorn
15 May 2026

Q1, You can follow ATO's apportionment calculation. More Simple

Q2 - Generally, property would need to used to be produce income to be able to claim deduction. If it's a non-deductible cost generally go into cost base,

Q3 - Regular and additional repayments need to be apportion (paragraph 16). Exception would be when you sell the asset itself (paragraph 17)

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How is interest calculated on a mixed‑purpose loan for rental property? | ATO Community