Portable Mortgages: Taking Your Loan With You When You Move

Selling your home and buying another one while you are locked into a fixed-rate mortgage can seem daunting. Break fees are a well-known concern for borrowers considering a move during a fixed term, but there is a feature offered by some New Zealand lenders that can sidestep this problem entirely: mortgage portability. At Chaperone, we think portability is one of the more practical but underappreciated features available to borrowers, and it is worth understanding before you assume moving mid-term will be expensive.

What Is a Portable Mortgage?

Mortgage portability allows you to transfer your existing home loan, including its fixed interest rate and remaining term, to a new property when you sell your current home and purchase another. Rather than repaying the loan on sale and taking out a new one on purchase, the mortgage travels with you to the new property. The mechanics involve discharging the security over the property you are selling and registering the lender's mortgage over the property you are buying, all under the same loan contract.

Not all lenders offer portability, and those that do may attach conditions to it. Understanding whether your current or prospective lender supports this feature, and on what terms, is worth doing early if you think you may move before your fixed rate expires.

Why Portability Matters

The primary benefit of portability is avoiding break fees. When you repay a fixed-rate loan before its term ends, lenders typically charge a break fee to recover the cost of funding that loan in the wholesale market. Depending on how much interest rates have moved since you fixed, these fees can range from a few hundred dollars to tens of thousands. Portability removes this cost in circumstances where you are simply moving the debt to a new property rather than repaying it.

A secondary benefit is continuity. If you fixed at a rate that looks favourable compared to current market rates, portability lets you keep that rate rather than being forced to re-fix at a higher one when you move. This can be a meaningful saving over the remaining fixed term.

Conditions That Typically Apply

Portability is rarely unconditional. Common requirements include that the new property must meet the lender's standard security criteria, meaning it needs to be an acceptable type of property in the lender's view. The loan-to-value ratio (LVR) on the new property must also be acceptable. If you are downsizing and the loan represents a higher LVR on the cheaper property, the lender may not approve the transfer without additional security or a partial repayment.

There is also usually a requirement that the transfer happens within a relatively short window around settlement. Portability does not generally allow you to be unencumbered between settlement of your sale and settlement of your purchase. Both transactions typically need to settle close together, which means timing your sale and purchase carefully is essential. Your solicitor plays a central role in managing this coordination.

When Portability Does Not Help

Portability solves the break fee problem but does not help if you need to borrow significantly more on the new property. If the new purchase requires a larger loan than the existing one, the additional borrowing will be at the current rate rather than the ported rate. This means you may end up with a split structure, part of the loan at the old fixed rate and part at a new rate, which may complicate your mortgage management.

Similarly, if you are moving to a property type that your lender does not accept as standard security, such as a leasehold property, a small apartment under a certain size, or a rural block, portability may not be available even if the lender offers the feature in principle.

How to Check If Your Loan Is Portable

The portability terms of your mortgage are set out in your loan documentation. If you are unsure, your lender or mortgage adviser can confirm whether your loan supports portability and what the conditions are. If you are applying for a new mortgage and think you may move during the fixed term, it is worth raising portability explicitly with your adviser and comparing lenders on this feature alongside the rate.

At Chaperone, we work with borrowers at every stage of the property journey, including those planning a move. A mortgage adviser can help you understand whether portability applies to your situation, how to structure the timing of your transactions, and what to expect from your lender throughout the process.