Split Loan

A split loan, also called a split-rate home loan, divides a single mortgage into two or more separate accounts, each carrying different terms, most commonly with one portion on a fixed interest rate and the other on a variable rate. The borrower chooses what proportion of the total loan goes into each portion, for example 60 percent fixed and 40 percent variable, and makes separate payments that are tracked against each portion according to its own rate and features.

The structure is popular in markets such as Australia, where many borrowers want some protection from rising rates through the fixed portion while retaining flexibility, such as the ability to make extra repayments without penalty, on the variable portion. Split loans allow borrowers to hedge against interest rate uncertainty without having to commit the entire loan balance to one rate type for the full duration of the loan term.

Rather than choosing fixed or variable for your entire mortgage, a split loan lets you have some of each, giving you partial protection if rates rise while still keeping some flexibility to pay down the loan faster without being penalized for doing so on at least part of the balance.

The fixed portion provides payment certainty and protection against future rate rises, giving the borrower confidence about at least part of their monthly budget regardless of what happens in the wider interest rate environment, while the variable portion usually allows extra repayments and redraw facilities not available on the fixed portion. The split itself can also be adjusted at renewal or refinancing as the borrower's risk tolerance or financial situation changes over the life of the loan.

Each portion of a split loan is typically treated as a separate sub-account with its own interest rate, term and features, which can add complexity to managing the loan compared with a single, straightforward facility carrying one unified rate. Borrowers generally need to decide the fixed-variable proportion at the outset, and changing that split later, particularly breaking a fixed portion early, can trigger break costs similar to a prepayment penalty on the fixed portion specifically.

There is no single correct split ratio, and the right balance between fixed and variable portions depends heavily on a borrower's personal appetite for interest rate risk, their expectations for where rates are headed, and how much flexibility they realistically expect to need for extra repayments over the coming years. Some lenders allow borrowers to adjust the split at renewal of the fixed portion, giving an opportunity to revisit the ratio periodically rather than being locked into the original decision for the entire life of the loan.

Some borrowers combine a split loan structure with an offset account linked to the variable portion, since offset facilities are generally only available on variable-rate loans rather than fixed ones, allowing the borrower to reduce the interest charged on that portion by keeping savings in the linked account. This combination lets a borrower capture both the rate certainty of a fixed portion and the interest-reducing flexibility of an offset arrangement on the remaining variable portion, which is one reason split loans remain a popular structure among borrowers who want to actively manage their mortgage rather than simply accept a single, fixed set of terms. Borrowers considering this combination should confirm directly with their lender exactly which features, such as an offset facility or a redraw option, are genuinely available on each specific portion of a proposed split, since not every lender offers identical features across both the fixed and variable sides of the same split arrangement.

Not every lender offers a split loan structure, and among those that do, the specific features available on each portion, such as offset facilities, redraw options or the ability to make unlimited extra repayments, can vary considerably from one lender to another. Borrowers interested in a split structure are generally advised to compare several lenders' specific split loan products side by side, rather than assuming the features available from one institution will automatically be matched elsewhere.