The RBA Cash Rate and Your Home Loan

What the RBA cash rate actually is

The cash rate is the interest rate the Reserve Bank of Australia targets for overnight loans between banks. It sounds technical and remote, but it is the single most important number in the home-loan market, because almost every other rate in the country is priced off it. When commentators say “the RBA moved rates today”, they mean the board lifted or cut this one target, usually by 0.25 per cent at a time, and the entire lending system adjusts around it.

The Reserve Bank meets to review the cash rate several times a year. Its job is to keep inflation inside a target band while supporting employment, so it tends to raise the cash rate when the economy runs hot and prices climb too fast, and cut it when growth slows and it wants to encourage spending and borrowing. For a homeowner, the takeaway is simple: the cash rate is the lever the central bank pulls, and your repayment is one of the things on the other end of it.

How a cash rate decision reaches your mortgage

When the Reserve Bank changes the cash rate, it changes what it costs banks to fund the loans they write. A large share of a bank’s funding is tied, directly or indirectly, to the cash rate, so a rise makes lending more expensive to provide and a cut makes it cheaper. Banks pass most of that change on to borrowers, which is why a cash rate move is followed within days by a wave of announcements from lenders adjusting their variable home-loan rates.

Banks are not required to pass on the full change, and they do not always do so. After a cut they sometimes hold back a fraction to protect their margins, and after a rise they occasionally add a little more than the official move. This is exactly where a broker earns their keep, because when your lender fails to pass on a cut in full, there is often another lender on the panel who has, and moving to them can be worth thousands over the life of the loan.

Variable rates and the direct line to the cash rate

A variable home-loan rate is the one most tightly connected to the cash rate. When the Reserve Bank moves, your lender reprices its variable rates and your minimum repayment changes accordingly, usually with a few weeks of notice. The advantage of a variable rate is that you feel a cut straight away, and you keep flexibility: you can make extra repayments, use an offset account, and refinance without break costs. The trade-off is that you also feel every rise, and your budget has to be able to absorb them.

As a rough guide, each 0.25 per cent rise adds around fifteen dollars a month per hundred thousand dollars borrowed. On a six hundred thousand dollar loan that is close to ninety dollars a month, or over a thousand dollars a year, for a single move. Several moves in a cycle add up quickly, which is why it pays to know how much room your budget has before rates climb rather than after.

Why fixed rates move to a different beat

Fixed rates behave differently, and this catches a lot of people out. A fixed rate is not priced off today’s cash rate. It is priced off wholesale money markets and the yield curve, which reflect where investors expect rates to be over the next few years. That is why fixed rates often move months before the Reserve Bank does. If lenders start quietly trimming their fixed rates, the market may be pricing in future cuts well ahead of any official announcement, and the reverse is true when fixed rates climb.

The practical result is that the fixed rate on offer today already contains the market’s best guess about the future. You are not beating the Reserve Bank by fixing; you are swapping uncertainty for certainty at a price the market has set. That can be a smart trade when you value a predictable repayment, but it is rarely the bargain it feels like, and it comes with less flexibility than a variable loan.

The serviceability buffer and your borrowing power

The cash rate does not just change your repayment. It changes how much a lender will let you borrow in the first place. Under APRA’s rules, banks must assess your ability to repay at a rate roughly 3 per cent above the actual rate you would pay. This serviceability buffer exists so that if rates rise, you can still afford the loan. It is also the reason so many buyers are shocked that a bank will approve far less than a simple online calculator suggests.

Because the buffer is applied on top of the current rate, a rise in the cash rate pushes your assessment rate up too, and your maximum borrowing capacity falls. Even a single 0.25 per cent move can trim a typical borrower’s maximum by two to three per cent. Over the size of a home loan that is a meaningful swing, and it is why getting your borrowing power reviewed after a rate decision, rather than relying on a number from six months ago, matters so much.

What to do when the rate rises

A rate rise is uncomfortable, but it is rarely a reason to panic. The first move is to check what your lender has actually done, because not every lender passes on the full increase, and the gap between the best and worst variable rates on the market is often larger than a single cash-rate move. If your rate has drifted well above the sharpest rates available, a refinance can claw back more than the rise just took from you.

Beyond refinancing, there are levers inside your existing loan. An offset account puts your savings to work reducing the interest you pay. Making the higher repayment voluntarily while rates are still low builds a buffer for when they climb. And if cash flow is genuinely tight, speaking to your lender early about options is far better than missing a payment, because lenders have hardship processes but they work best before you fall behind.

What to do when the rate falls

A cut is good news, but it is easy to waste. The most common mistake is to let your repayment drop automatically and quietly spend the difference. If you can afford to, keeping your repayment at the old, higher level means the whole cut goes straight onto your principal, and you can shave years off the loan without feeling a cent poorer than you did last month.

The second thing to check is whether your lender actually passed the cut on. Lenders are quick to lift rates and slow to lower them, and some hold back part of a cut. If yours has, that is a signal to shop the market. A cut cycle is often the best time to refinance, because sharper rates and cashback offers tend to appear as lenders compete for borrowers, and a broker can line those up against your current deal in an afternoon.

Fixed, variable, or split

There is no single right answer, only the right answer for your situation. A variable rate suits you if you value flexibility, want to make extra repayments, and can absorb rises in your budget. A fixed rate suits you if certainty matters more than flexibility, for example if you are on a tight budget or want to lock in a repayment for a few years while you settle into a new home. A split loan, where part is fixed and part is variable, gives you some of both: a predictable core repayment plus the freedom to make extra payments on the variable portion.

What matters most is matching the structure to your life, not trying to time the market. The buyers who do best are rarely the ones who guessed the next move correctly. They are the ones who chose a structure they could live with through a full cycle, kept a buffer, and reviewed their loan when circumstances changed.

Frequently asked questions

How quickly does a cash rate change hit my repayment?

On a variable loan, usually within a few weeks. Lenders announce their new rates within days of a Reserve Bank decision and then give you notice before your minimum repayment changes. On a fixed loan, nothing changes until your fixed term ends.

Will my bank always pass on the full change?

No. Banks are not obliged to move in step with the Reserve Bank, and they often hold back part of a cut or add a little to a rise to protect their margins. This is exactly why comparing lenders after a move is worth the effort.

Should I fix my rate before the next rise?

Only if certainty is what you need. The fixed rate on offer already reflects the market’s expectation of future moves, so fixing is a way to lock in a predictable repayment, not a way to beat the Reserve Bank. Weigh the certainty against the flexibility you give up.

Does a rate change affect how much I can borrow?

Yes. Lenders assess you at roughly 3 per cent above the actual rate, so when the cash rate rises your assessment rate rises with it and your maximum borrowing capacity falls. A review after any decision tells you exactly where you stand.