At 4.5% / 25 yrs
£833
per month (repayment)
At 5.0% / 25 yrs
£877
per month (repayment)
At 6.0% / 25 yrs
£966
per month (repayment)
A £150,000 mortgage sits right in the sweet spot for UK buyers purchasing properties in the North West, Yorkshire, the Midlands, and parts of Scotland — areas where average house prices make this a very realistic borrowing amount. Unlike the higher loan amounts common in London and the South East, a £150k mortgage is achievable on a modest single income, and the repayments are often comparable to — or cheaper than — renting locally.
That said, there is more to budgeting for a £150k mortgage than a single monthly figure. The difference between a 4% and a 6% interest rate on this loan amount is worth over £130 per month and more than £39,000 over a 25-year term. This page breaks down exactly what drives that number and how to make sure you are getting the best deal possible.
£150,000 Mortgage Calculator
£150k mortgage repayment table — rates and terms compared
The table below shows estimated monthly repayments on a £150,000 capital repayment mortgage across six common interest rates and four term lengths. The highlighted row represents a 4.5% rate, broadly in line with competitive two-year fixed deals available in mid-2025.
| Interest rate | 20-year term | 25-year term | 30-year term | 35-year term |
|---|---|---|---|---|
| 3.5% | £869 | £751 | £674 | £622 |
| 4.0% | £909 | £792 | £716 | £665 |
| 4.5% | £949 | £833 | £760 | £710 |
| 5.0% | £990 | £877 | £805 | £756 |
| 5.5% | £1,032 | £921 | £851 | £804 |
| 6.0% | £1,075 | £966 | £899 | £853 |
| 6.5% | £1,118 | £1,013 | £948 | £904 |
Figures are approximate and for illustrative purposes only. Based on a capital repayment mortgage with no fees included.
How is a £150k mortgage payment calculated?
Lenders use a standard amortisation formula to calculate your monthly repayment. It ensures that each payment covers both the interest accrued that month and a portion of the outstanding capital, so the loan is fully repaid by the end of the term.
Repayment mortgage formula
M = P × [ r(1 + r)ⁿ ] ÷ [ (1 + r)ⁿ − 1 ]Where:
M = monthly payment
P = principal loan amount (£150,000)
r = monthly interest rate (annual rate ÷ 12)
n = total number of monthly payments (years × 12)
Worked example
For a £150,000 mortgage at 4.5% annual interest over 25 years:
- r = 4.5% ÷ 12 = 0.375% per month = 0.00375
- n = 25 × 12 = 300 monthly payments
- M = 150,000 × [0.00375 × (1.00375)³⁰⁰] ÷ [(1.00375)³⁰⁰ − 1]
- M ≈ £833 per month
In the early years of the mortgage, most of that £833 covers interest rather than capital. By roughly year 12–13, the split begins to reverse, and you start chipping away at the balance more meaningfully each month.
For interest-only mortgages, the calculation is simpler: monthly payment = (P × annual rate) ÷ 12. On £150,000 at 4.5%, that is £562.50 per month — but the full £150,000 remains outstanding at the end of the term.
Real-world UK examples
To make these figures more tangible, here are three scenarios based on typical UK buyer profiles in different parts of the country.
Sarah is buying a two-bed terraced house in Sheffield for £165,000. She has saved a £16,500 deposit (10%), meaning her mortgage is £148,500 — close to our £150k example. She secures a two-year fixed rate at 4.65% over a 30-year term.
Monthly repayment: approximately £767. Her rent was £850 per month, so she is already saving money despite stamp duty and solicitor costs adding around £2,500 upfront.
James bought his home five years ago and is coming off a fixed rate deal. His outstanding balance is £152,000 with 20 years remaining. His lender's standard variable rate (SVR) has jumped to 7.2%, pushing his payment to around £1,196 per month.
By remortgaging to a new two-year fix at 4.8%, his monthly repayment drops to £988 per month — saving £208 per month, or £2,496 per year.
Marcus owns a flat in Liverpool with a £150,000 buy-to-let mortgage on an interest-only basis at 5.2%. His monthly mortgage cost is £650. The property rents for £950 per month, giving a gross monthly profit of £300 before maintenance, letting agent fees, and tax.
He uses our rental yield calculator to track whether the investment still makes financial sense as rates have changed. His gross rental yield is 7.6% — comfortably above the typical threshold of 5–6% for Liverpool.
Common mistakes when taking out a £150k mortgage
Only comparing headline rates, not the overall cost
A mortgage with a very low rate can still work out more expensive if it comes with high arrangement fees. On a £150k mortgage, a £1,999 product fee on a deal that is 0.1% cheaper can take years to pay back through lower monthly payments. Always compare the total cost over the initial fixed period, not just the rate.
Choosing the longest term to minimise monthly cost, then not overpaying
Stretching to a 35-year term on £150k at 4.5% saves around £123 per month compared to 25 years — but costs an extra £47,000 in interest over the life of the loan. If you do take a longer term for flexibility, commit to overpaying regularly. Most lenders permit up to 10% of the outstanding balance per year without an early repayment charge.
Forgetting to budget for what happens when the fixed rate ends
Many borrowers fix for two or five years, then forget to remortgage in time. Reverting to the lender's SVR — often 7–8% — on a £150,000 balance adds hundreds of pounds per month overnight. Diarise your deal end date at least six months ahead so you can review your options without rushing.
Underestimating the total cost of borrowing
It is easy to focus on the monthly figure and overlook the bigger picture. At 4.5% over 25 years you will repay approximately £250,000 on a £150,000 loan — that is £100,000 in interest. Understanding this number helps inform decisions about deposit size, overpayments, and term length from the very start.
Not stress-testing affordability against a higher rate
If you are taking a two-year fix at 4.5%, consider whether you could still afford the payments if your next fix is 1–1.5% higher. On £150k that is an extra £95–£140 per month. Most lenders will already stress-test this during the application, but it is wise to run the numbers yourself before committing.
When is this calculator most useful?
🔍
Early-stage research
Before speaking to a lender or broker, use this to understand what monthly commitment you are taking on and whether it fits your budget.
🔄
Remortgage planning
Coming to the end of a fixed deal? Input your remaining balance and compare what different rates would cost monthly before approaching lenders.
📈
Rate rise scenario planning
Stress-test your budget. Plug in a rate 1% or 2% above your current deal to see whether your finances could absorb higher repayments at renewal.
💰
Overpayment impact
Adjust the loan amount downward to simulate overpayments and see how reducing your balance affects future monthly costs and total interest.
What salary do you need for a £150,000 mortgage?
At the standard 4.5× income multiple used by most high-street lenders, a £150,000 mortgage requires a gross annual salary of at least £33,333. At 4× income, you would need to earn at least £37,500. These thresholds apply to sole applicants; joint borrowers can combine their incomes before the multiplier is applied.
Some specialist lenders and mortgage brokers can access products with higher income multiples — particularly for professionals such as doctors, solicitors, and accountants — but 4–4.5× is the practical benchmark for most applicants. Beyond income, lenders will also scrutinise monthly outgoings, credit commitments, and the stability of your employment.
If a £150k mortgage is at or near your maximum borrowing capacity, use our mortgage affordability calculator to model different scenarios before submitting a formal application — multiple declined applications within a short period can leave a mark on your credit file.
Frequently asked questions
What is the monthly repayment on a £150,000 mortgage?
At 4.5% interest over 25 years on a repayment mortgage, you would pay approximately £833 per month. At 5% that rises to around £877, and at 6% to approximately £966. Use the calculator above to adjust for your specific rate and term.
What salary do I need for a £150,000 mortgage in the UK?
At the most common income multiple of 4.5×, you would need to earn at least £33,333 gross per year as a sole applicant. If applying jointly, lenders typically combine both salaries before applying the multiplier, making the threshold much more achievable on combined incomes.
How much deposit do I need for a £150k mortgage?
That depends on the property value. If the property costs £166,667 and you borrow £150,000, your deposit is 10% — a sensible target. A 10% deposit unlocks significantly better rates and is worth targeting if your timeline allows.
Is it better to take a 25-year or 35-year mortgage on £150k?
A 25-year term at 4.5% costs £833/month but you pay approximately £100,000 in total interest. A 35-year term drops the monthly cost to £710 but pushes total interest to around £148,000 — an extra £48,000. If you choose the longer term, overpaying regularly whenever possible significantly closes the gap.
Can I overpay a £150,000 mortgage to reduce the term?
Yes. Most UK lenders allow overpayments of up to 10% of the outstanding balance per year without an early repayment charge. Overpaying £200 per month on a £150k mortgage at 4.5% over 25 years could save approximately £20,000 in interest and shorten the term by around four to five years.
Related calculators
DisclaimerAll figures on this page are estimates for illustrative purposes only and do not constitute financial or mortgage advice. Monthly repayments will vary based on your lender's specific terms, any associated fees, and changes in interest rates. Speak to a qualified, FCA-regulated mortgage adviser before making any borrowing decisions.
About the author
✓ Editorially reviewed — all Poqet guides are checked for factual accuracy before publication and updated when UK rates or legislation change. Editorial Policy