See what overpaying would actually do: how much interest you’d save, how many years it’d take off, and when you’d be mortgage free. No form, and nothing asked for before you see the numbers.
We also show what it does to your loan to value, which is the bit other calculators miss and is often worth more than the interest.
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For illustration only. Figures assume your interest rate stays the same for the full term, which is unlikely in practice, and do not account for any early repayment charges. Check your lender’s overpayment terms before you commit. Clever Lending is authorised and regulated by the Financial Conduct Authority (FRN 795789).
A £200,000 mortgage at 4.5% with 20 years left. The gap widens every year, because early overpayments have the longest time to work.
You would pay in £38,400 over that time and get £22,900 of saved interest back, plus the years at the end with no mortgage payment at all.
| No overpayment | £200 a month extra | |
|---|---|---|
| Monthly payment | £1,265 | £1,465 |
| Time to repay | 20 years | About 16 years |
| Total interest | £103,700 | £80,700 |
| Interest saved | — | About £22,900 |
Early overpayments do the heavy lifting, because they have the longest time to work. The same £200 a month started a decade from now saves a fraction of that.
Almost every overpayment calculator stops at interest saved. What they miss is what overpaying does to your loan to value, which is often the bigger number. Lenders price in bands, usually at 60%, 75%, 80%, 85% and 90%, and crossing a boundary can move you onto a better rate, often by a quarter to half a percentage point.
| Before | After a £5,000 overpayment | |
|---|---|---|
| Balance | £245,000 | £240,000 |
| Loan to value | 81.7% | 80.0% |
| Rate band | 85% | 80% |
| Worth over a five year fix | — | Around £6,000 |
Say your home’s worth £300,000 and you owe £245,000. That’s 81.7%, so you’re priced in the 85% band. Overpay £5,000 and you’re at £240,000, which is exactly 80% and a cheaper band. Half a percentage point on £240,000 is around £1,200 a year, so on a five year fix that £5,000 could be worth roughly £6,000, on top of the interest it saves on its own.
Timing is what makes it work. The overpayment has to land before your remortgage valuation, and the lender’s valuer decides which side of the line you fall on, so you need a realistic view of what the property’s worth. Worth a conversation a few months before your deal ends, not a few weeks.
Most lenders will ask which you want, and the answer matters more than people expect.
| Reduce the term | Reduce the monthly payment | |
|---|---|---|
| What happens | You keep paying the same and finish sooner | Your payment drops, the end date stays put |
| Interest saved | Considerably more | Much less |
| Flexibility | Lower, you are committed to the payment | Higher, useful if money is tight |
| Best for | Anyone whose budget can take it | People who want breathing room now |
Reducing the term is where the saving is. Reducing the payment feels better month to month but hands most of the benefit back. If you’re undecided, some lenders let you overpay ad hoc without formally changing either, which keeps your options open.
This is the part that costs people money. Most fixed rates let you overpay up to 10% of the outstanding balance each year penalty free. Go over and you’ll usually face an early repayment charge, often 1% to 5% of the amount repaid, which on a decent lump sum can wipe out years of saved interest in one transfer.
The allowance is normally worked out on the balance at the start of your mortgage year, and your mortgage year is often the completion anniversary rather than January. Some lenders let you carry unused allowance forward and plenty don’t. Trackers and variable rates frequently have no cap at all.
Your mortgage offer states the exact terms, and if you can’t find it your lender will tell you on the phone. It’s a five minute job that’s much better done before you move the money than after.
No universal answer, but there’s a rough order most people work through.
| Option | When it tends to make sense |
|---|---|
| Clear expensive debt first | Credit cards and unsecured loans almost always cost more than your mortgage |
| Build an emergency fund | Money overpaid is hard to get back out. Three to six months of outgoings first |
| Overpay the mortgage | When your mortgage rate beats what you would earn on savings after tax |
| Save or invest instead | When returns beat your mortgage rate, allowing for risk and tax |
| Buy an investment property | Income and gearing, but also work, risk and tax that overpaying does not carry |
| Pension contributions | Tax relief can make these efficient, particularly at higher rate |
The simplest test is your mortgage rate against your savings rate after tax. None of this is advice on your own position, and anything involving pensions or investments is worth taking proper advice on.
If the mortgage you’re overpaying is on a rental, the maths changes, and not in the direction most people assume.
Held personally, you no longer deduct mortgage interest as an expense. You get a basic rate tax credit instead, so overpaying reduces your interest and reduces the credit alongside it. For higher rate landlords it usually still comes out positive, but by less than the headline rate suggests. Held in a limited company, interest is still a fully deductible business expense, which makes the effective cost of company borrowing lower than the rate on the paper and overpaying correspondingly less attractive than it looks.
Most buy-to-let is interest only, so overpaying doesn’t shorten a term. What it does is cut the balance, which lowers your monthly interest straight away and improves your LTV for the next remortgage or capital raise.
Which brings up the question portfolio landlords actually wrestle with: is spare cash better used clearing debt on one property, or as a deposit on the next one? Our rental yield calculator will show you what a purchase would need to return to beat what overpaying saves you, and we can stress test the borrowing side. We arrange buy-to-let mortgages every week, from single lets to HMOs, MUFBs and full portfolios.
Six figures and two choices. Here is what each one means.
| Field | What to enter |
|---|---|
| Outstanding balance | What you owe now, not what you originally borrowed |
| Years remaining | The term left to run, on your annual statement |
| Interest rate | Your current rate. If your fix ends soon, try a higher figure too |
| Property value | So we can show what the overpayment does to your LTV |
| Regular overpayment | An amount you can keep up. Consistency beats a one-off |
| Lump sum | Check it against your 10% allowance first |
Then run it again with a smaller overpayment started sooner. Starting earlier usually beats paying more later, and seeing the two side by side makes that obvious in a way a paragraph doesn’t.
Clever Lending is a specialist property finance brokerage, authorised and regulated by the Financial Conduct Authority. Overpaying is between you and your current lender, and you don’t need a broker to do it. Where we’re useful is what comes next.
If you’re overpaying to drop an LTV band before a remortgage, the timing and the valuation both matter and we’ll tell you straight whether it’s worth doing. If your income comes from a limited company, self-employment or several sources, that’s a complex income mortgage and the lender list narrows quickly. And if you’re weighing clearing debt against buying the next property, we’ll run the numbers on both sides rather than just the one that earns us a fee.
Send us the outline and we’ll come back within 24 business hours with a clear route forward. No fees until we’ve found you a solution, and you’ll speak to an advisor from the first call, not a triage team.
You can see everything we arrange on our borrower finance options page.
Overpaying is between you and your current lender. Where we are useful is what comes next: dropping an LTV band before a remortgage, complex income, or weighing clearing debt against buying the next property.
It depends on your balance, your rate and how long’s left, but the effect is bigger than most people expect. On a £200,000 mortgage at 4.5% with 20 years to run, £200 a month extra saves around £22,900 in interest and clears it about four years early.
Regular monthly overpayments are usually the most effective route, because they start saving interest straight away and keep doing it for the rest of the term. Ask for the overpayment to reduce the term rather than the payment, since that’s where the saving sits. Lump sums help too, but check them against your annual allowance first.
On most fixed rates, 10% of the outstanding balance a year. Above that you’ll normally pay an early repayment charge of 1% to 5% of the amount repaid. Trackers and variable rates often have no cap. Your mortgage offer has the exact terms and your lender will confirm them over the phone.
Reducing the term saves considerably more, because you keep paying the same amount and simply finish sooner. Reducing the payment is easier month to month but hands most of the benefit back. If your budget can absorb it, reduce the term.
Compare your mortgage rate with what you’d earn on savings after tax. If the mortgage rate is higher, overpaying usually wins. Before either, clear more expensive debt and keep three to six months of outgoings accessible, because money put into a mortgage is hard to get back out.
It can help a lot. Lenders price in loan to value bands, so an overpayment that takes you from just above a threshold to just below can move you onto a better rate. Getting from 81% to 80% is often worth more than the interest the overpayment itself saves.
It’s a different question to overpaying your own home. Held personally you only get a basic rate tax credit on mortgage interest, and held in a company the interest is fully deductible, which makes company debt cheaper in real terms than the rate suggests. Most buy-to-let is interest only too, so overpaying cuts the balance and improves your LTV rather than shortening a term.
Usually not. Some lenders offer a borrow back facility and offset mortgages work differently, but on a standard mortgage the money has gone into the debt. That’s the main argument for building an emergency fund first.
Overpaying is a guaranteed return equal to your mortgage rate, with no work attached. A rental generates income and can be geared, but carries voids, maintenance, tax and risk. Our rental yield calculator shows what a property would need to return to beat what overpaying saves you, and we can stress test the borrowing before you commit to anything.
You can, and if you’re carrying expensive unsecured debt it’s often the better move. It does mean securing that debt against your home and usually spreading it over a longer term, so the monthly cost falls while the total often rises. Worth advice rather than a calculator.
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