Rate and Balance Combinations for a £300 Monthly Saving
Using 2025 market rates, here are realistic combinations that produce £300 per month in savings. Moving from 7.5% SVR to a 4.3% five-year fix (3.2% reduction) on £113,000 saves £301/month. The same rate reduction on a £150,000 balance saves £400/month. A 2% reduction (perhaps from a 6.5% SVR or an expired fix) on £180,000 saves exactly £300/month. A 1.5% improvement on £240,000 also delivers £300/month.
For homeowners coming off two-year fixes taken at around 5.5% in 2023, renewing at 4.3% in 2025 delivers a 1.2% improvement. On a £300,000 mortgage, that 1.2% reduction saves £300/month exactly. On larger London and South East mortgages where balances above £300,000 are common, even a 1% saving produces £300 or more per month.
Annual saving: £3,600. Three-year saving: £10,800. Five-year saving: £18,000. Even after paying the maximum typical fee of £2,000 on a remortgage, the net five-year saving is £16,000 — a substantial household financial improvement.
The calculation is straightforward but the product selection is complex. Different lenders price risk differently based on LTV, employment type, and property value. A broker comparison ensures you get the rate closest to best-buy for your specific profile.
The Real Cost of Staying on SVR When You Could Save £300 a Month
The Standard Variable Rate is not designed to be competitive. It is the rate lenders charge when no deal is in place, and it is almost always significantly above the best available fixed rates. In 2025, the average UK SVR is around 7.5%. The best five-year fix is around 4.3%. That 3.2% gap on a £130,000 mortgage — roughly the UK average outstanding balance — costs approximately £347 per month in unnecessary extra interest.
Over 12 months on SVR at £300 overpayment, you waste £3,600. Over two years, £7,200. Over three years, £10,800. This money goes directly to your lender as profit rather than reducing your mortgage balance or funding your household. It is, in effect, an avoidable tax on inaction.
More than 800,000 UK homeowners are estimated to be on SVR at any given time. Many are unaware of how much they are overpaying, or believe that switching is too complex or costly. In reality, most remortgages complete in under eight weeks and can be managed largely through a broker on your behalf.
If you are on SVR and saving £300 a month is possible, every month you delay costs you £300. Over a year that inaction costs £3,600. The FCA encourages borrowers to review their mortgage at least annually precisely because of this pattern of costly inertia.
