See your monthly repayment, total interest paid, and how your balance reduces over the term — using current average UK mortgage rates as a starting point.
Your monthly mortgage repayment depends on three things: how much you borrow, the interest rate, and the term. The calculator below works this out instantly, whether you're buying personally with a residential mortgage or buying through a limited company with a buy-to-let product.
Enter your loan amount and term. Use a current rate above or your own quote. Choose "Interest only" only if your lender has confirmed this is your repayment type — most residential mortgages are capital & interest. Not sure which to pick? Read repayment vs interest-only.
Limited company mortgages typically carry a 0.2–0.5% rate premium over personal buy-to-let rates, and fewer lenders offer them — a specialist broker is usually needed.
Current average UK rates — 19 June 2026
2yr fixed
5.68%
5yr fixed
5.63%
SVR
7.13%
Tap a rate to use it below, or enter your own. Bank of England base rate: 3.75%.
Limited company buy-to-let rates — indicative, April 2026
2yr fixed
5.14%
5yr fixed
6.04%
Limited company rates vary more by lender than personal rates — always confirm with a broker before relying on these figures.
£
%
yrs
Monthly repayment
£1,540
Total interest paid
£212,000
Total amount repaid
£462,000
Monthly interest rate0.469%
5.63% ÷ 12 = 0.469%
Lenders charge interest monthly, so the annual rate is split into twelve equal parts.
Number of payments300
25 years × 12 = 300
Your repayments are spread evenly across every month of the mortgage term.
Monthly repayment£1,540
This is the fixed amount that pays off the interest plus a portion of what you borrowed, every month, so the balance reaches zero by the end of the term.
Balance remaining at the end of each year
Reference rates are UK averages and update periodically — they are not a personalised quote. Estimates only; actual mortgage offers depend on lender criteria, fees, and product type. Always speak to a mortgage adviser before proceeding.
What this actually means
Why is my mortgage interest so high at the start?
Your monthly payment is the same throughout a fixed-rate deal, but what it's made up of changes. Early on, the bulk of it is interest, because you owe the most at that point. As the balance falls, more of each payment chips away at the capital instead — which is why the breakdown above shows the balance falling slowly at first, then faster.
Can I overpay without a penalty?
Most lenders let you overpay up to 10% of the outstanding balance per year without any charge. Go over that during a fixed or tracker deal and you'll usually face an early repayment charge — typically 1-5% of the amount above the limit. Standard variable rate mortgages generally have no such limit.
What happens when my fixed deal ends?
If you do nothing, you move onto your lender's standard variable rate (SVR) — usually 1.5-2% higher than the fixed rate you were on. Most people remortgage to a new deal a few months before their current one ends to avoid this jump.
Is a limited company rate always higher?
Usually, by around 0.2-0.5%, though it varies by lender. Switch to "Limited company" mode above to see indicative rates for that route, which sit higher than the personal residential rates shown by default.
Worked example: borrowing against the average Scottish home
The average Scottish house price is currently £172,000 (see our homepage stats). Assuming a 25% deposit, that's a loan of £129,000. Here's what that costs at today's average rates over a 25-year term:
Personal — 5yr fixed at 5.63%
Monthly repayment: roughly £802. Total interest over 25 years: roughly £111,700.
Limited company — 5yr fixed at 6.04%
Monthly repayment: roughly £834. Total interest over 25 years: roughly £121,300 — about £32 more a month than the personal route, for this loan size.
In the early years of a capital and interest mortgage, most of your payment goes toward interest because the outstanding balance is at its highest. As the balance reduces, a bigger share of each payment goes toward capital — so the balance falls faster in later years.
What happens when my fixed deal ends?
Unless you remortgage onto a new deal, you'll move onto your lender's standard variable rate (SVR), which is usually significantly higher. Most people switch to a new fixed or tracker deal before this happens.
Can I pay my mortgage off early?
Most lenders allow some overpayment each year without penalty, often up to 10% of the balance. Paying more than this, or repaying the full balance early, may trigger an early repayment charge during a fixed-rate period — check your mortgage offer for the specific terms.
Why is the limited company rate higher?
Lenders see company lending as carrying more administrative complexity and, in some cases, more risk, which is reflected in a typical 0.2-0.5% rate premium over personal buy-to-let. The smaller pool of lenders offering company products also reduces price competition.
Want the full picture?
This page covers the calculation itself. For more on what affects your rate and how lenders assess mortgages, see the full guide. Trying to decide between repayment and interest-only? Read our dedicated guide on that choice — it's the bigger decision behind the "Repayment type" dropdown above.