A £350,000 mortgage represents a significant financial commitment — and increasingly a common one for buyers in commuter belt areas of the South East, parts of the South West, and anyone upsizing to a larger family home in areas where prices have climbed steadily over the last decade. At this loan size, rate decisions carry real weight. The difference between a 4% and 5% rate is worth around £198 per month — £11,880 over a five-year fixed period — making even a small improvement in the rate you secure financially meaningful.
£350k also sits above the first-time buyer stamp duty relief threshold on most properties at this borrowing level, meaning stamp duty becomes a material upfront cost that needs to sit alongside the deposit in your budget planning. This page covers the full picture: exact repayment figures, how the calculation works, what income you need, and the specific financial decisions that matter most at this loan amount.
£350,000 Mortgage Calculator
£350k mortgage repayment comparison table
The table below shows monthly repayments across seven interest rates and four term lengths on a capital repayment basis. At £350k the 20-year vs 35-year total interest gap widens to over £164,000 — worth bearing in mind when choosing your term.
| Interest rate | 20-year term | 25-year term | 30-year term | 35-year term |
|---|---|---|---|---|
| 3.5% | £2,028 | £1,753 | £1,572 | £1,450 |
| 4.0% | £2,121 | £1,848 | £1,671 | £1,554 |
| 4.5% | £2,215 | £1,945 | £1,773 | £1,659 |
| 5.0% | £2,310 | £2,046 | £1,878 | £1,767 |
| 5.5% | £2,407 | £2,148 | £1,986 | £1,878 |
| 6.0% | £2,507 | £2,255 | £2,099 | £1,993 |
| 6.5% | £2,610 | £2,364 | £2,213 | £2,110 |
Estimates only. Capital repayment mortgage. Fees, insurance and product charges not included.
Rate sensitivity at £350,000 — why small changes matter more here
At £350k, every 0.5% shift in interest rate moves your monthly payment by approximately £99 on a 25-year term. Over a five-year fixed period, a 0.5% improvement in the rate you secure saves roughly £5,940 — the equivalent of a substantial home improvement budget. The panel below shows how your payment changes at renewal across three common scenarios, using a baseline of 4.5%.
A 1% rate rise at renewal adds £203 per month to your repayment on £350k. Over the life of a new five-year fix, that is an extra £12,180 in mortgage costs. Building a £200/month buffer into your budget from day one means a rate rise at renewal is absorbed without disruption rather than creating a financial crisis. This is the single most useful stress-test you can run before committing to a £350k mortgage at any rate.
How the monthly payment on a £350k mortgage is calculated
The amortisation formula used by every UK mortgage lender converts your loan amount, interest rate, and term into a fixed monthly payment. Understanding the inputs helps you verify figures independently — and model how changing any one variable affects the output.
M = monthly payment
P = principal (£350,000)
r = monthly interest rate = annual rate ÷ 12
n = total payments = term in years × 12
Worked example: £350,000 at 4.5% over 25 years
- r = 4.5% ÷ 12 = 0.375% = 0.00375 per month
- n = 25 × 12 = 300 payments
- M = 350,000 × [0.00375 × (1.00375)³⁰⁰] ÷ [(1.00375)³⁰⁰ − 1]
- M ≈ £1,945 per month
In the very first month of this mortgage, approximately £1,312.50 goes to interest — 67.5% of the entire payment — and only £632.50 reduces the capital balance. The balance at the end of month one is £349,367.50, not £349,000. This gradual front-loading of interest is why overpaying in the early years has such a pronounced effect: each extra pound reduces a balance that is still being charged interest on the full £350,000 range.
For interest-only at the same rate: (£350,000 × 4.5%) ÷ 12 = £1,312.50 per month. The £632.50 monthly saving versus repayment sounds attractive until you account for the £350,000 still owed at the end of the term. Over 25 years the total interest-only cost reaches approximately £393,750 — £160,250 more than on a repayment mortgage.
Overpayment impact on a £350,000 mortgage
At £350k, the financial case for overpaying is particularly compelling. The interest saving is calculated on a larger base than lower loan amounts, and the guaranteed tax-free return mirrors your mortgage rate — which for higher and additional-rate taxpayers beats most savings accounts on an after-tax basis.
| Overpay £100/month | Saves approx. £24,000 interest, cuts ~2.5 yrs |
| Overpay £200/month | Saves approx. £45,500 interest, cuts ~4.5 yrs |
| Overpay £300/month | Saves approx. £64,700 interest, cuts ~6.5 yrs |
| Overpay £500/month | Saves approx. £97,000 interest, cuts ~9.5 yrs |
An overpayment of £300/month on a £350k mortgage saves nearly £65,000 in interest — more than 18% of the original loan — at zero additional risk. Most lenders permit up to 10% of the outstanding balance per year without an early repayment charge: on £350k that is a penalty-free overpayment allowance of up to £35,000 per year.
Deposit thresholds for a £350,000 mortgage
At this loan size, the LTV tier you achieve has a measurable impact on your monthly payment and your total interest bill. The table below maps the property price, deposit amount, and indicative rate tier for each common LTV threshold — assuming a £350,000 mortgage in each case.
| Property price | Deposit | LTV | Rate tier | Approx. rate range |
|---|---|---|---|---|
| £368,421 | £18,421 (5%) | 95% | Entry level | 5.2–6.8% |
| £388,889 | £38,889 (10%) | 90% | Standard | 4.4–5.4% |
| £411,765 | £61,765 (15%) | 85% | Competitive | 4.15–4.95% |
| £437,500 | £87,500 (20%) | 80% | Best standard rates | 3.95–4.65% |
| £500,000 | £150,000 (30%) | 70% | Premium rates | 3.75–4.45% |
Rate ranges are illustrative mid-2025 estimates. Actual rates depend on lender, credit profile, and product type.
Moving from a 90% LTV deal to an 85% LTV deal on a £350k mortgage typically saves around £115–£135 per month at current market rates — a difference of £6,900–£8,100 over a five-year fix. That is a compelling financial argument for stretching deposit savings by six to twelve months if you are close to the next threshold.
Real UK buyer scenarios at £350,000
David and Claire are selling their three-bed in Maidstone for £310,000. After clearing their existing £195,000 mortgage and transaction costs, they walk away with approximately £108,000 in equity. They use £87,500 as a 20% deposit on a £437,500 four-bed, leaving £20,500 as a financial cushion. Their new mortgage is £350,000 at 80% LTV.
Their lender offers a five-year fix at 4.1% over 25 years. Monthly repayment: approximately £1,867. Combined income is £112,000, so the mortgage represents around 30% of their combined monthly net pay — comfortably within sensible affordability limits.
Stamp duty as home movers on £437,500: approximately £11,875. They budget £3,500 for solicitor and survey fees, bringing total upfront costs to around £15,375 on top of the deposit.
Imogen and Ravi are buying their first home in East Oxford for £388,889. They have saved £38,889 between them (10% deposit), giving them a mortgage of £350,000 at 90% LTV. Their combined gross income is £96,000 (£54k + £42k), easily meeting the 4.5× multiple for £350k borrowing.
They opt for a five-year fix at 4.55% over 30 years to keep monthly costs manageable while they settle into ownership. Monthly repayment: approximately £1,791. As first-time buyers purchasing above £300,000, they pay stamp duty only on the portion above that threshold: £4,444 — less than the £6,944 a home mover would pay on the same property.
Their combined take-home is around £5,950/month, so the mortgage represents 30.1% of net income — good. They set up a joint £150/month overpayment from month one, targeting the 85% LTV tier at renewal to access better rates in five years.
Nadia bought her home five years ago with a £400,000 mortgage. Her outstanding balance is £353,000 with 21 years left on the term. Her two-year fix has just expired and her lender has moved her to the SVR at 7.49%. Her payment has jumped from £1,910 to £2,781 per month — a shock increase of £871.
She uses our mortgage calculator to model a new five-year fix at 4.5% over the remaining 21 years. New monthly payment: approximately £2,144 — saving £637 per month versus the SVR. Over the five-year fixed period that saving totals £38,220, comfortably absorbing any arrangement fee.
What salary do you need for a £350,000 mortgage?
A £350,000 mortgage requires a meaningful income, particularly for sole applicants. The table below shows how different income scenarios stack up against standard lending multiples.
| Income scenario | Max at 4× | Max at 4.5× | £350k verdict |
|---|---|---|---|
| £65,000 solo | £260,000 | £292,500 | Below threshold — needs 5× lender |
| £70,000 solo | £280,000 | £315,000 | Specialist lender at 5× required |
| £78,000 solo | £312,000 | £351,000 | Achievable at 4.5× |
| £88,000 solo | £352,000 | £396,000 | Comfortable at 4× |
| £45,000 + £35,000 joint | £320,000 | £360,000 | Achievable jointly at 4.5× |
| £50,000 + £40,000 joint | £360,000 | £405,000 | Comfortably within reach |
| £60,000 + £30,000 joint | £360,000 | £405,000 | Comfortably within reach |
Multiples are illustrative. Actual offers depend on outgoings, credit history, deposit size, and employment type.
For sole applicants earning below £78,000, the route to a £350k mortgage usually involves either a specialist lender offering 5× income multiples — which reduces the solo threshold to around £70,000 — or a joint application with a partner or eligible family member. Lenders in the professional mortgage space regularly stretch to 5.5× for the right borrower profile.
When is this calculator most useful?
£350k is a realistic borrowing figure for family homes across Kent, Essex, Hertfordshire, and parts of Surrey. Use this to confirm what monthly commitment you are taking on before making an offer.
At £350k a 1% rate rise adds over £200/month. Model your payment at current rate plus 1% and 2% to confirm your budget has sufficient headroom before the next renewal.
The monthly saving from moving from 90% to 85% LTV is worth £115–£135/month at this loan size. Quantify exactly how much the extra deposit saves before deciding when to stop saving.
Coming off a fixed deal at £350k? Compare your SVR payment against a new fixed rate here. At this balance the monthly saving from remortgaging promptly is typically £500–£800+.
Common mistakes on a £350,000 mortgage
- ⚠️Forgetting that stamp duty is now a significant cost at this price point
At £350k borrowing, you are likely purchasing in the £390,000–£440,000 range. First-time buyers pay 0% up to £300,000 and 5% above that — so a £430,000 purchase costs £6,500. Home movers pay 0% up to £125,000, 2% up to £250,000, and 5% above that — on a £435,000 purchase that is approximately £11,750. Many buyers budget the deposit but forget stamp duty until close to exchange.
- ⚠️Choosing the longest term without modelling the total cost
On £350k the difference in total interest between a 20-year and 35-year term at 4.5% exceeds £164,000. That is not an abstract number — it is the equivalent of a substantial pension fund contribution or a university education fund. If affordability genuinely requires a longer term, build in a committed overpayment plan from day one rather than accepting the full 35-year cost passively.
- ⚠️Accepting the first mortgage offer without comparing total cost
At £350k a 0.25% difference in rate is worth approximately £49/month and nearly £14,700 over a five-year fix. Shopping around — or using a whole-of-market broker — to find even a marginally better rate has a far larger financial impact at this loan size than at £150k. Always compare at least two or three competitive offers before deciding.
- ⚠️Not accounting for potential childcare costs in affordability
Many households taking on a £350k mortgage are in their early-to-mid thirties — precisely when childcare costs can add £1,000–£2,000 per month to outgoings. Lenders will stress-test affordability, but they use standard cost assumptions. If you are planning a family within the next two to three years, model your budget with a realistic childcare cost reduction in net monthly income before committing to a repayment at the top of your affordability range.
- ⚠️Relying solely on a single lender's assessment of what you can borrow
Different lenders use different affordability models, stress-test rates, and income multiples. A lender that declines or limits your application at £350k may simply have a more conservative model — while another, particularly a specialist or professional lender, might approve the same application comfortably. If your first application is unsuccessful or limited, consult a whole-of-market broker rather than assuming the maximum is fixed.
Frequently asked questions
- What is the monthly payment on a £350,000 mortgage?
At 4.5% over 25 years on a capital repayment basis, monthly payments are approximately £1,945. At 5% the figure rises to £2,046, and at 6% to £2,255. Over a 30-year term at 4.5% the monthly cost drops to £1,773, while over 20 years it rises to £2,215.
- What salary do I need for a £350,000 mortgage in the UK?
At 4.5× income you need at least £77,778 gross per year as a sole applicant. At 4× the threshold rises to £87,500. For joint applicants, combined salaries of £78,000 or above comfortably meet most lenders' criteria. Professional mortgage lenders offering 5× income reduce the solo threshold to £70,000.
- How much deposit do I need for a £350,000 mortgage?
On a £388,889 property, a 10% deposit of £38,889 gives you a £350k mortgage at 90% LTV. The minimum 5% deposit on a £368,421 property requires £18,421. At this loan size the monthly saving from reaching the 85% LTV tier (15% deposit on a £411,765 property) is approximately £115–£135 — making the extra saving time financially worthwhile for most buyers.
- How much total interest do you pay on a £350,000 mortgage?
At 4.5% over 25 years you pay approximately £233,500 in interest on top of the £350,000 capital — a total of around £583,500. Over 30 years total interest rises to approximately £284,600. Overpaying £200/month from the outset saves around £45,500 in interest and cuts approximately four and a half years off a 25-year term.
- Is a £350,000 mortgage achievable on a joint income?
Yes. Two salaries totalling £78,000 or more — for example £45,000 and £33,000 — comfortably meet most lenders' criteria at a 4.5× multiple. The majority of £350k mortgages are arranged on joint applications, and many lenders will include bonus and commission income in affordability assessments at a 50–60% weighting, further improving the picture for joint applicants in performance-related roles.
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