RBA Cut vs BoE Path: What Rate Divergence Means for Investors
- The RBA's August cut and the BoE's cut path move debt costs in opposite directions for cross-border investors.
- Model your lender's actual pass-through, not the headline cash rate — 40 of 50bps changes your DSCR.
- UK Section 24 means higher-rate landlords get only a 20% credit on interest, not a full deduction like in Australia.
- Re-run holding-period projections in local currency; a single 50bp move compounds across a ten-year hold.
Two central banks, two divergent trajectories, and one shared problem for anyone holding leveraged property across both jurisdictions: the cost of debt is moving, and it is not moving in sync.
The RBA held its nerve, then blinked
After the Reserve Bank kept the cash rate at 4.35% through the first half of the year, the August decision brought the first meaningful shift many investors had been modelling since late 2024. For a portfolio geared at 70% LVR, the difference between a 4.35% and a 3.85% cash rate is not academic. On a $2.4m debt position, a 50 basis point move is roughly $12,000 a year in interest before tax, and for a negatively geared holding that flows straight into your deductible expense line and your after-tax holding cost.
The practical question is whether your lender passes the cut through in full and how quickly. Standard variable investor rates rarely track the cash rate one-for-one. If your bank passes 40 of 50 basis points, your actual saving on that $2.4m book is closer to $9,600, and your DSCR improves less than a naive model would suggest. This is exactly the kind of gap that shows up when you record actuals against forecast rather than assuming the headline number.
The BoE is cutting, but the mortgage market already priced it
The Bank of England’s path has been the mirror image. With Bank Rate stepping down from its 5.25% peak, UK investors have watched fixed-rate products reprice ahead of the cuts rather than after them. Anyone who came off a sub-2% five-year fix taken in 2020 or 2021 is still refinancing into materially higher rates, cut path or not. A £400,000 buy-to-let mortgage rolling from 1.9% to 4.7% adds around £11,200 a year in interest.
That matters more in the UK because of Section 24. Since the finance cost restriction fully bit, higher-rate UK landlords no longer deduct mortgage interest as an expense. They receive a 20% tax credit on finance costs instead. So a higher-rate taxpayer facing that £11,200 interest increase does not get to offset it against 40% or 45% of income the way an Australian investor offsets deductible interest against their marginal rate. The BoE cutting helps, but only to the extent it feeds into your next fixed-rate deal.
Why the divergence complicates cross-border portfolios
If you hold property in both countries, and a growing number of expats and returning Australians do, the two rate paths pull your cash flow in opposite directions at the same time. Your Sydney holding might see its monthly interest fall while your Manchester flat refinances upward. Netting those into a single view means holding two currencies, two tax treatments, and two rate assumptions in the same model.
This is where a consolidated dashboard earns its place. Tracking each property in its local currency, with GBP interest treated under the Section 24 credit and AUD interest treated as a full deduction, gives you a portfolio-level cash flow figure that reflects reality rather than a blended fiction.
What to actually model now
Generic advice says “stress test your rates.” The specific version is more useful:
- Model the pass-through, not the cash rate. For your AU holdings, run a scenario where your lender passes 40 of the next 50 basis points and see what it does to your DSCR at each property.
- Model your UK refinance at the forward curve, not today’s spot. If your fix expires in 14 months, the relevant rate is what five-year money costs then, not now.
- Separate the tax effect from the cash effect. A lower AU rate reduces your deduction and your gross cost together. A UK rate change interacts with the 20% credit, so the after-tax outcome differs from the headline saving.
- Re-run your holding-period projection. A single 50 basis point move compounds across a ten-year hold. Small monthly changes shift your break-even and your projected equity position meaningfully by year five.
Rate decisions are not events to react to once. They are inputs you re-run every time the assumption changes, across every property and every currency you hold.
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