Inputs
Property price
£
Deposit
£
Mortgage term
yrs
Annual interest rate
%
Lump sum overpayment
One-off payment to reduce the balance
£
Additional monthly costs
▾
Service charge
£/month
£
Ground rent
£/year
£
Council tax
£/month
£
Buildings insurance
£/month
£
Results
Share your result
🏠Monthly repayment
£2,011
Principal & interest only
📈Total interest
£241,501
Over 25 years
💷Total repaid
£603,301
Loan £361,800 + interest
Where your money goes
Total repayment split
Principal (£361,800)
Interest (£241,501)
Annual interest vs principal
Principal repaid
Interest paid
Guide
Mortgage Questions
What is a good mortgage rate in the UK?
In 2025, competitive fixed-rate mortgages range from 3.5% to 5.5%, depending on your LTV, credit score, and the deal length. A lower LTV (larger deposit) typically unlocks better rates. Always compare the total cost over the deal period, not just the headline rate.
What is a service charge and ground rent?
Service charge covers the maintenance of shared areas in a leasehold property — lifts, hallways, gardens, building insurance, and management fees. Ground rent is an annual fee paid to the freeholder. Under the Leasehold Reform Act 2022, ground rents on new leases in England and Wales are now capped at zero (a "peppercorn"), but existing leases may still have charges.
How much deposit do I need for a mortgage?
Most lenders require a minimum 5% deposit, though 10–15% opens up significantly better rates. A 20% or larger deposit gives access to the best deals and avoids higher lending charges. First-time buyers may qualify for government schemes that allow smaller deposits.
Should I get a fixed or variable rate mortgage?
Fixed rates give payment certainty for 2–5 years, protecting you from rate rises. Variable rates (trackers or SVR) may start lower but can increase. In a rising rate environment, fixing provides budget security. In a falling rate environment, trackers can save money.
What is LTV and why does it matter?
Loan-to-value (LTV) is the ratio of your mortgage to the property value, expressed as a percentage. A £270,000 mortgage on a £300,000 property is 90% LTV. Lower LTV means less risk for the lender, which translates to lower interest rates for you. Every 5% drop in LTV can meaningfully reduce your rate.
How We Calculate
- Monthly rate r = annual rate ÷ 12
- Number of payments n = term in years × 12
- Repayment = loan × r × (1 + r)n ÷ ((1 + r)n − 1)
- Interest = remaining balance × monthly rate
- Principal = monthly repayment − interest
- New balance = old balance − principal
All figures are nominal — no inflation adjustment applied. This is an illustrative model, not financial advice.
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