How does an RBA rate change affect my borrowing power?

It catches many buyers off guard: rates rise, and suddenly the bank will lend them less, even though their pay has not changed at all. The link between the Reserve Bank cash rate and your borrowing power is direct, and once you understand it you can plan around it rather than be surprised by it.

How the cash rate flows to your loan

The RBA sets the official cash rate, which influences the cost of money across the economy. When it moves, lenders generally review and adjust their own interest rates, though each lender decides independently if, when and by how much. So a cash rate change tends to flow through to home loan rates, but not always immediately or evenly.

Why higher rates cut borrowing power

Because lenders assess you at your actual rate plus a buffer of around 3 percentage points, a higher rate means a higher assessed repayment, and a higher assessed repayment means less of your income is left to service a loan. The result is a lower maximum borrowing figure. The same logic works in reverse when rates fall.

The 2026 picture

As at June 2026 the cash rate sits at 4.35 per cent, after a series of rises through the year. Higher rates have lifted the assessment rates lenders use, which has squeezed borrowing capacity compared with the lower rate period. It is a key reason many buyers in 2026 find their borrowing power lower than they expected.

Your income did not change but your capacity did

This is the part that frustrates people. You can earn exactly what you did last year and still be told you can borrow less, purely because the assessed repayment has risen with rates. It is not about you, it is about the maths of the assessment, and recognising that helps you respond sensibly rather than take it personally.

The buffer means it is not one for one

A rate rise tends to reduce borrowing power by more than the rate move alone, because you are assessed at the higher rate plus the buffer on top. So even a modest cash rate move can have a noticeable effect on the maximum you can borrow, which is worth keeping in mind when rates are moving.

What this means if you are buying

A pre-approval reflects the rates in force when it was assessed, so if rates move while you are house hunting, your real number can change and a pre-approval may need to be refreshed. In a moving market it is wise to keep your finance current and to factor some headroom into your plans rather than stretch to the very top.

What you can control

You cannot control the RBA, but you can offset some of the pressure. Reducing debts, trimming expenses, lowering credit card limits and choosing a lender whose policies suit you all lift your assessed surplus, which can claw back some of the capacity that higher rates take away.

How a broker helps in a moving market

When rates are moving, a broker can re-assess your position, compare lenders whose assessment rates and policies are more favourable, and keep your pre-approval current so you are ready to act. That support is usually at no cost to you, because the lender pays the broker on settlement.