The Maths Favour the Tracker — They Almost Always Do
Over any rolling 20-year period in the UK, variable-rate borrowers have paid less than fixed-rate borrowers. The premium you pay for a fix is the lender's insurance charge — and like all insurance, it's priced to make the insurer a profit.
Right now, Nationwide offers a two-year tracker at 3.94% (base + 0.19%, 60% LTV, £999 fee) according to the HomeOwners Alliance rate tables. Santander's best two-year fix is 3.83%. That's a 0.11 percentage point gap in the fix's favour today. But the fix locks you in at 3.83% for two years, while the tracker drops every time the BoE cuts.
If the Bank of England base rate falls to 3.50% by September — just one 25bp cut — your tracker drops to 3.69%. Two cuts and you're at 3.44%. The fix stays at 3.83% regardless.
On a £250,000 mortgage over 25 years, every 0.25% reduction saves roughly £35/month. Two cuts save £70/month. Over the remaining 18 months of a two-year deal, that's over £1,000 in your pocket — money the fixed-rate borrower gifted to their lender.
The FCA's mortgage lending data shows tracker mortgages account for a growing share of new lending as borrowers bet on the cutting cycle continuing. They're right to.