Staying with the same bank and moving to a new lender can both lower a mortgage repayment, but they are not the same process and they don’t always produce the same result. An internal switch usually means less paperwork and a faster turnaround. An external refinance means a full new application, but often access to sharper pricing than an existing lender is willing to offer a loyal customer.
What an Internal Switch Actually Involves
Switching products within the same bank, sometimes called a rate match or internal refinance, generally avoids a full new loan application. The loan account often stays in place, there’s usually no discharge of the existing mortgage, and the bank may not require a fresh valuation if the loan-to-value ratio is well within its limits.
This makes an internal switch quicker in most cases, sometimes settled within days rather than weeks. It also avoids some of the costs that come with moving to a new lender, such as a new loan establishment fee. The trade-off is that the borrower is only ever comparing the bank’s own products against each other, not against the wider market.
What External Refinancing Involves
Moving to a new lender means submitting a full application: updated income documents, a new credit check, and usually a fresh valuation of the property. The existing loan needs to be formally discharged, which can carry a discharge fee, and the new loan may carry its own establishment costs.
In exchange for that extra process, refinancing externally opens the door to the full market rather than one lender’s product range. Some external refinances also come with cashback offers, though these need to be weighed against discharge and establishment fees rather than treated as free money.
Does switching internally affect your credit file?
Usually less than a full external refinance does. Because an internal switch typically doesn’t involve a new credit application in the same way, it often avoids triggering a fresh hard credit enquiry. An external refinance does generate a credit enquiry, though a single, well-considered application generally has a modest and temporary impact on most credit files.
Why the Rate Offered Internally Is Often Not the Best Available
Banks generally price more aggressively for new customers than for existing ones, since acquiring a new customer is worth more to them than retaining one who is already unlikely to leave. This is sometimes called the loyalty tax: existing borrowers on older products can end up paying more than a new customer walking in the door for the same bank, on the same day.
An internal switch can still improve on a borrower’s current rate, but it’s rarely the sharpest rate that lender has on offer, and it’s almost never the sharpest rate on the market. Comparing the internal offer against at least two or three external options gives a clearer picture of whether staying put is actually the cheaper path.
Loan Features Worth Checking Either Way
An internal switch or an external refinance can both affect features that matter day to day, such as an offset account, redraw access or the ability to make extra repayments without a cap. A cheaper rate attached to a product with fewer features isn’t automatically a win if those features were doing real work for the borrower’s finances.
Fixed and variable splits also need checking. Some internal switches only apply to the variable portion of a split loan, leaving a fixed portion unchanged until its term ends. Borrowers with a split loan structure should confirm exactly which part of the loan a proposed switch actually touches before comparing the numbers.
What to Compare Before Choosing Either Path
The comparison rate is a starting point, since it bundles the interest rate with most standard fees into a single figure. But it doesn’t capture everything relevant to a specific decision, such as a cashback offer, a discharge fee on the existing loan, or a break cost if part of the loan is fixed.
Working through the total cost over a realistic timeframe, rather than just the headline rate, usually gives a more accurate answer. A borrower two years from the end of a fixed period, for example, needs to weigh any break cost against the savings from switching before deciding whether to act now or wait.
Key Takeaways
- An internal switch usually means less paperwork and a faster turnaround than a full external refinance.
- External refinancing involves a new application, a credit check and often a new valuation, but opens access to the wider market.
- Banks typically price more sharply for new customers than existing ones, so an internal switch is rarely the best rate on offer.
- A single, well-considered refinance application generally has only a modest, temporary impact on a credit file.
- Cashback offers and discharge or establishment fees both need to be weighed against each other, not looked at in isolation.
- Loan features like offset accounts and redraw access are worth checking before assuming a lower rate is the better deal.