Selling a house with a mortgage: what happens to your loan

If you’re selling a property that still has a mortgage on it, it’s natural to wonder whether you’ll simply repay the balance and move on. In practice, what happens next depends on your mortgage terms and your plans for the next property.

For many home movers, the decision comes down to two routes:

• Paying off your mortgage and taking out a new one
• Porting (transferring) your existing mortgage to your next home

This guide explains how the process typically works, what can affect your options, and the points worth checking before you commit to a sale timeline.

What happens to your mortgage when you sell?

When you sell a mortgaged property, the mortgage lender’s interest must be cleared from the sale proceeds. That usually means one of the following outcomes:

1) You settle the mortgage using sale proceeds

This is the most common outcome when you’re buying a new home and your existing mortgage can’t (or won’t) be transferred.

In a standard sale/purchase, you typically use the equity in the property to fund the next purchase. The mortgage is repaid at completion, and you then arrange the mortgage for the onward property.

2) You port your mortgage to the next property

If your lender allows it, you may be able to move your existing mortgage product to a new property. Porting can be attractive if you want to keep the same mortgage product and avoid certain costs that can apply when repaying early.

3) The lender takes possession (rare, but possible)

If a property is being sold due to serious financial difficulty, the outcome may be different. In repossession scenarios, the lender may take control of the process and settle the mortgage directly from the sale.

How do you sell a mortgaged house?

Selling a mortgaged property is broadly the same as selling any other home, but there are extra mortgage-related steps to manage.

Price and equity considerations

To complete the sale, the proceeds must cover:

• the outstanding mortgage balance (the amount required to redeem the loan)
• sale costs (for example, conveyancing and agent fees)
• any other secured charges, where applicable

If the sale price doesn’t cover the mortgage balance, you may face additional challenges. This is often referred to as negative equity.

Checking your settlement figure

Before you commit to a sale price or timeline, it’s important to understand what it would cost to redeem the mortgage at that point in time. The lender will typically be able to provide a redemption/settlement statement.

Early repayment charges (ERCs)

Many mortgages include an early repayment charge if you repay the loan (or part of it) within a certain period, particularly during a fixed-rate or discounted term.

If you’re planning to settle your mortgage at completion, ERCs can affect the net proceeds you have available for your onward purchase. If you’re considering porting, whether ERCs apply will depend on your mortgage terms and the lender’s porting rules.

Negative equity: what to consider

If you owe more than the property is likely to sell for, you’ll need a plan for how the shortfall will be addressed.

Common approaches include:

• having additional funds available to cover the difference
• negotiating a realistic sale strategy that reflects current market value
• considering whether your mortgage terms and lender requirements allow any flexibility

Negative equity can be especially complex if you’ve only recently purchased or if the property has not had time to build equity. In these situations, it’s important to understand the numbers early so the sale doesn’t stall at completion.

Do you need your lender’s permission?

In many cases, you don’t need to “ask” to sell—mortgage redemption is a normal part of the conveyancing process.

However, there are situations where lender involvement becomes more significant, for example:

• porting your mortgage to a new property (which generally requires lender approval)
• changes to the security on the property (such as splitting title where land is involved)

If your sale involves unusual property arrangements—such as selling part of a property or land—lender consent may be required to adjust the mortgage security.

Do you need a new mortgage when you move?

Not always.

When you might not need a new mortgage

If you can port your mortgage, you may be able to keep the same mortgage product (subject to lender approval) and transfer it to the next property.

When you likely will need a new mortgage

You’ll usually need a new mortgage if:

• porting isn’t available for your mortgage type or circumstances
• the amount of borrowing changes significantly
• the next property doesn’t meet the lender’s requirements
• your mortgage terms don’t allow the transfer in the way you need

In these cases, you would typically redeem the existing mortgage and arrange a new one for the onward purchase.

Can you transfer (port) your mortgage to another property?

Porting is often possible, but it’s not automatic. Lenders generally assess:

• whether the new property is acceptable security
• whether the loan amount and structure remain within their rules
• whether the mortgage product can be moved under the existing terms

Porting can be beneficial because it may help you avoid certain costs associated with repaying early. It can also be helpful if you’re trying to manage affordability during a move.

That said, porting isn’t always the best option. If you need additional borrowing for renovations, or if the onward property is materially different from the original, a new mortgage may be more suitable.

Porting vs paying off: what’s the trade-off?

Both routes can make sense depending on your circumstances.

Porting may suit you if:

• you want to keep the same mortgage product
• you’re trying to avoid early repayment charges
• the onward property fits the lender’s criteria

Paying off and taking a new mortgage may suit you if:

• you need a different loan structure or additional borrowing
• the onward property doesn’t meet porting requirements
• you’re looking to change the mortgage term or features

The “better” option is usually the one that aligns with your goals for the move and the costs involved—particularly any ERCs, changes in the interest rate environment, and the impact on your loan-to-value.

Timing matters: planning around completion

Because mortgage redemption and mortgage application processes both run alongside the conveyancing timetable, planning ahead can reduce last-minute issues.

Key timing points include:

• allowing time to obtain accurate settlement figures
• understanding when ERCs would apply (if you repay)
• ensuring any porting approval steps are completed early enough to protect the sale and purchase chain

Summary: the key questions to answer before you sell

Before you commit to a sale plan, it helps to clarify:

• Will you settle your mortgage at completion, or is porting feasible?
• What would the redemption/settlement amount be at the time you expect to complete?
• Would early repayment charges apply if you repay?
• Does your onward purchase meet the lender’s requirements for porting?
• Are there any special circumstances (such as negative equity or changes to the property security) that could affect the process?

A clear understanding of these points can make the selling process smoother and help you plan the onward purchase with confidence.

Get advice

If you’re planning to sell and buy at the same time, speaking to our brokers can help you understand your options (including whether porting is likely to be available) and what to check before you commit to a timeline.