Remortgaging
Are you a mortgage prisoner? Here's how to check.
Being a mortgage prisoner isn't the same as struggling to find a cheaper deal. It's a specific, narrower problem: a lender's affordability rules block you from switching even though you've paid on time every month, often for years, and even though switching would lower your payment. The FCA built a rule to fix exactly this in 2019. Whether it helps you depends on details most people never check.
What actually makes someone a mortgage prisoner
The term gets used loosely for anyone unhappy with their rate, but the FCA's definition is specific. You're a mortgage prisoner if you're up to date with payments, want to remortgage to a cheaper deal, and can't, because a lender's standard affordability check no longer fits your circumstances. The most common cause is a loan sold on to an inactive lender after the 2008 financial crisis, one that doesn't offer new deals at all, leaving borrowers stuck on that lender's reversion rate indefinitely. The next most common cause is stricter income or age rules introduced after 2014 that a borrower's original mortgage never had to meet, so a switch that would lower their payment still fails a check designed around new lending, not existing debt.
The FCA rule that's supposed to fix it
In October 2019 the FCA told lenders they could use a modified affordability assessment for borrowers in this position. Instead of the full income and expenditure check applied to a new borrower, a lender can approve a switch based on a simpler test: has this person paid on time, and are they not borrowing more or moving house. You qualify for the modified test if you're up to date with your current mortgage, not looking to increase the loan beyond fees, and not buying a different property. The rule doesn't force any specific lender to accept you. It only permits lenders to use the lighter test if they choose to.
Why it still doesn't work for most people
That permissive wording is the catch. FCA data found the rule change directly enabled only a few hundred switches in its first years, against an estimated 140,000 borrowers who qualify. Most high-street lenders' application systems are built around the full standard assessment and haven't been rebuilt to route eligible customers through the modified one, so an application from a mortgage prisoner is often rejected automatically before a human ever applies the lighter test. The borrowers who do get through it usually go via a specialist broker who knows which lenders actually operate the modified assessment in practice, rather than applying to a high-street name directly and assuming the rule applies everywhere.
What the gap actually costs
As of September 2026 the average SVR sits at 7.35%, against an average five-year fix around 5.64%, a gap of roughly 1.7 percentage points. On a £160,000 balance with 15 years left, that's the difference between a monthly payment of about £1,470 on the SVR and about £1,320 on the fix, a saving of roughly £150 a month, or £1,800 a year, for someone whose payment record alone should qualify them for the switch. That's the saving the modified assessment is meant to make possible, and it compounds every month the application sits stuck.
What to actually do
Start by checking whether your current lender is active or has stopped offering new deals. If it's an inactive lender or you were sold on after your original deal ended, ask specifically about the modified affordability assessment by name when you apply, rather than a general remortgage. If a mainstream lender's online system rejects you, a whole-of-market broker who specialises in mortgage prisoner cases is worth the conversation before assuming no lender will take you; what a mortgage adviser checks covers what that conversation should include. And if you're not locked out at all but simply weighing a product transfer against a full remortgage, product transfer versus remortgage covers that more common decision in detail.
Frequently asked questions
What qualifies someone as a mortgage prisoner?
Being up to date with your mortgage payments, wanting to remortgage to a cheaper deal, and being blocked by a lender's standard affordability check that no longer fits your situation, typically because your loan was sold to an inactive lender or your circumstances changed after 2014's stricter lending rules.
Does the FCA's modified affordability rule guarantee I can switch?
No. It permits lenders to use a lighter affordability test for eligible borrowers, but doesn't require any specific lender to offer it. Many high-street lenders' systems still route applications through the full standard check, which is why a specialist broker familiar with which lenders actually apply the modified test often gets better results than applying directly.
How much does staying on the SVR as a mortgage prisoner actually cost?
As of September 2026, the average SVR is around 7.35% against an average five-year fix around 5.64%. On a £160,000 balance with 15 years remaining, that gap is roughly £150 a month, about £1,800 a year, for as long as the switch stays blocked.
See what staying is costing you
The free timeline shows what your current rate is costing you against a deal you could switch to, using your own figures. For £7.99 we then watch it and email you on the days that matter.
Examples are illustrative and rounded. Your own mortgage offer and lender confirm your actual figures and dates. This is information, not financial advice. For advice on your circumstances, speak to a mortgage adviser regulated by the FCA.