Bank of England · GBP · Pass-through 90% over 2 months
Average historical spread mortgage − policy rate: 0.75pp. Current spread: 1.10pp. Above the long-run average — banks are charging a wider risk premium than usual.
Policy rate vs. typical fixed mortgage rate; the shaded area is the spread.
Where the typical fixed mortgage rate ends up if the futures-implied policy path holds and the historical spread reverts to its long-run mean.
The four tiles at the top show the live policy rate (set by Bank of England), the interbank rate (SONIA), and the typical fixed and variable mortgage rates available to a household in United Kingdom. The gap between the policy rate and the mortgage rate is the spread — what the lender adds on top to cover funding, credit risk and profit.
The first chart shows that spread over the last five years. When the shaded area widens, banks are charging more on top of the policy rate, usually because the long bond market has moved or because banks are pricing in extra risk. When it narrows, competition or central bank bond-buying is squeezing margins. The second chart — the implied 12-month forward path — takes the current futures market's bet on where the policy rate is heading, applies the historical spread, and shows where your mortgage rate would land if both relationships hold. It is not a forecast: it is what current market pricing already implies.
The mortgage-minus-policy spread observed for United Kingdom (1.10pp current vs 0.75pp historical mean) decomposes into four primary drivers. First, the funding curve: jurisdictions whose lenders fund predominantly via covered bonds (Germany, Denmark, France, Sweden) inherit the swap-plus-covered-spread basis, which moved from 5-15 bp pre-2022 to 25-50 bp during the ECB's APP/PEPP unwind. Lenders funded via deposit franchise (UK, Australia) anchor more to short-rate transmission and deposit beta. US lenders sell loans into agency MBS pools, so the spread is sensitive to the primary-secondary MBS basis and to Fed SOMA reinvestment policy.
Second, prepayment optionality and convexity: products without economic prepayment penalty (US 30Y, Danish callable bonds) trade at OAS rather than nominal spread; OAS widening during rate volatility regimes (VIX-Treasury MOVE comovement) bleeds straight into the borrower rate. Penalty-protected European products (German Festzins under §489 BGB, French indemnité de remboursement anticipé) carry minimal optionality premium. Third, lender duration mismatch: if the dominant local product is short-fixed (UK 2/5Y) the lender's asset-liability gap is small and the spread is stable; if long-fixed (US 30Y, German 10Y) lenders rely on swap and MBS markets to hedge duration, and spread widens when those hedge markets stress. Fourth, regulatory caps and capital treatment: France's taux d'usure, prudential LTV/DTI floors (Switzerland, Australia, Canada), and Basel III risk-weight differentiation across LTV buckets all alter the marginal cost of lending and feed back into quoted rates with lags of one to three quarters.
| Month | Implied Policy Rate | Projected 2-Year Fixed (75% LTV) | Spread |
|---|---|---|---|
| 2026-05 | 3.75% | 4.69% | +0.94pp |
| 2026-06 | 3.81% | 4.63% | +0.83pp |
| 2026-07 | 3.81% | 4.60% | +0.79pp |
| 2026-08 | 3.98% | 4.66% | +0.68pp |
| 2026-09 | 4.14% | 4.76% | +0.62pp |
| 2026-10 | 4.14% | 4.82% | +0.68pp |
| 2026-11 | 4.27% | 4.91% | +0.64pp |
| 2026-12 | 4.34% | 4.99% | +0.65pp |
| 2027-01 | 4.34% | 5.04% | +0.70pp |
| 2027-02 | 4.34% | 5.06% | +0.72pp |
| 2027-03 | 4.34% | 5.07% | +0.73pp |
| 2027-04 | 4.34% | 5.08% | +0.74pp |
The Bank of England’s Monetary Policy Committee (MPC) sets Bank Rate — the rate paid on commercial bank reserves. Bank Rate anchors SONIA (Sterling Overnight Index Average), the post-LIBOR benchmark for sterling. The UK has the fastest mortgage transmission of any G7 economy, for three reasons:
The result: a 25 bp Bank Rate move passes through to ~20 bp of average effective mortgage rate change within 2-3 months, the highest pass-through ratio among the seven banks tracked here.
The snapshot table at the top of the page shows the live 2-year fix (75% LTV, the most-quoted benchmark), the SVR, SONIA, and Bank Rate. Note the SVR is structurally elevated — it reflects the lender’s discretionary rate that captures borrowers who do not actively shop. The “advertised” 2-year fix is what new borrowers actually pay.
The 2-year fix vs. Bank Rate spread has averaged roughly 0.75 percentage points since 2010, but it whipsawed dramatically during 2022-2023:
The SVR vs. Bank Rate spread is structurally much wider — typically 2-3 pp — because SVRs are not actively negotiated.
The implied path uses SONIA 1-month futures (ICE) to derive the expected Bank Rate at each future MPC meeting. The 2-year fix is then projected by applying the historical spread, smoothed by a high pass-through factor (0.90) and short transmission lag (2 months) reflecting the UK’s responsive mortgage market.
If markets are pricing in further BoE easing, the projected 2-year fix should fall close to in step. If markets price holds, the fix should stay flat. Compare against the Bank of England meeting probabilities for the granular meeting-by-meeting picture.
See the Bank of England page for MPC meeting probabilities and the Yield Curve Monitor for gilt context.