08 / OVERPAYMENT
Mortgage Overpayment Calculator
See the exact impact of paying a little extra each month — how much interest you save, and how many years come off your mortgage term.
Mortgage Planning Cluster
Use this hub to move from the core repayment formula into affordability, offset, overpayment, and rent-versus-buy comparisons without leaving the mortgage cluster.
Mortgage Details
Overpayment
£2,400 / year
Check your mortgage terms — many lenders allow up to 10% annual overpayment without early repayment charges.
Impact of Overpaying
Interest Saved
£38,458
Time Saved
5y 1m
New Term
19y 11m
vs original 25 years
Standard Total Interest
£166,874
With Overpayment
£128,416
Balance Comparison
Yr
Standard
Overpaying
Saved
Y1
£2,450
Y4
£10,497
Y7
£19,704
Y10
£30,240
Y13
£42,295
Y16
£56,089
Y19
£71,873
Standard balance
With overpayment
Cluster Hubs
Use these organising pages when you want the main calculators and supporting guides for this topic grouped in one place.
Related Calculators
Move sideways to closely related calculators without leaving the same topic cluster.
Use the Mortgage RepaymentMonthly payment, total interest, and full cost over any term.Use the Mortgage AffordabilityThe maximum you can borrow based on income, deposit, and stress test.Use the Offset MortgageHow savings reduce mortgage interest and shorten your term.Use the Rent vs BuyLong-term financial outcome of renting against buying.
Related Guides
Use these supporting explainers when you need the formula, assumptions, or decision framing behind the numbers.
Read How Much Overpayment Cuts 5 Years Off a Mortgage?A practical overpayment page for users who care more about removing years than saving a headline amount of interest, with a focus on the monthly extra required to hit that target.Read Keep an Emergency Fund or Overpay the Mortgage? The Trade-Off in Plain MathA decision guide comparing liquidity and resilience against the guaranteed interest saving created by paying down a mortgage sooner.Read Lump-Sum Overpayment vs Monthly Overpayment: Which Reduces Interest Faster?Compares one-off mortgage lump-sum reductions with steady monthly overpayments and shows how timing affects both the balance and the interest saved.Read Monthly Overpayment vs Annual Lump Sum: Which Timing Usually Wins?A timing comparison for borrowers deciding whether regular monthly overpayments or a once-a-year cash reduction is the cleaner way to cut interest.