What Affordability Actually Means to a Lender
Affordability is not simply "how much you earn." Since the Mortgage Market Review (MMR) rules introduced by the FCA in 2014, every regulated lender must conduct a detailed affordability assessment that goes far beyond income multiples. The assessment must demonstrate that:
- You can afford repayments at the initial rate you're applying for
- You could still afford repayments if interest rates rose (the stress test)
- Your committed expenditure and essential living costs leave enough disposable income
- The loan is sustainable over the full mortgage term
Lenders use proprietary affordability models — not a single universal formula. This means the same applicant can be approved for £280,000 with one lender and only £240,000 with another. The difference isn't random; it reflects how each lender weights income, expenditure categories, and risk.
Affordability vs Loan-to-Value (LTV)
These are separate constraints that both must be satisfied:
| Constraint | What It Limits | New Build Impact |
|---|---|---|
| Affordability | Maximum loan based on income and expenditure | Service charges and ground rent reduce disposable income |
| LTV | Maximum loan as percentage of property value | Many lenders cap new build LTV at 85–90% (vs 95% for existing homes) |
You'll be limited by whichever constraint is tighter. A buyer earning £60,000 might pass affordability for a £270,000 loan but be limited to £255,000 if the lender caps new build flats at 85% LTV on a £300,000 property.
Income Multiples: The Starting Point
Income multiples give a rough guide to maximum borrowing, but they are not how modern lenders make decisions. They're useful for initial budgeting only.
Typical Income Multiples by Lender Type
| Lender Type | Standard Multiple | Enhanced Multiple (conditions apply) |
|---|---|---|
| High street banks | 4.0–4.5× income | Up to 5.0× for high earners (£50,000+) or professionals |
| Building societies | 4.0–4.75× income | Up to 5.5× for specific professional schemes |
| Specialist lenders | 4.0–4.5× income | Up to 6.0× for doctors, lawyers, accountants via professional mortgages |
| Joint applications | 3.5–4.0× combined | Up to 4.5× combined for dual high earners |
What Counts as "Income" for Multiples
| Income Source | Typical Treatment | Percentage Usually Accepted |
|---|---|---|
| Basic salary (PAYE) | Fully accepted | 100% |
| Guaranteed overtime | Usually accepted | 100% if contractual |
| Regular overtime/commission | Averaged over 6–12 months | 50–100% depending on lender |
| Annual bonus | Averaged over 2–3 years | 50–60% of average |
| Self-employed profit | Average of last 2–3 years | 100% of average (some use latest year if higher) |
| Rental income (BTL portfolio) | Varies significantly | 0–100% depending on lender |
| Benefits (child benefit, tax credits) | Some lenders accept | 100% where accepted |
| Pension income | Fully accepted | 100% |
| Investment/dividend income | Averaged, evidence required | 50–100% |
| Second job income | Accepted if sustained 12+ months | 100% of net |
Why Income Multiples Are Misleading
A buyer earning £50,000 with no debts and low living costs could borrow significantly more than a buyer earning £70,000 with car finance, credit cards, and three children. Income multiples ignore expenditure entirely, which is why lenders abandoned them as the primary tool after MMR. Use them for rough budgeting, but expect the real affordability model to produce a different (often lower) number.
How Lenders Actually Calculate Affordability
Modern affordability assessment follows this sequence:
Step 1: Verify Gross Income
Lenders confirm income through payslips (typically 3 months), P60, bank statements, and employer references. Self-employed applicants provide SA302 tax calculations and tax year overviews from HMRC, usually covering 2–3 years.
Step 2: Calculate Net Monthly Income
Gross income is converted to net (after tax, National Insurance, and pension contributions). Some lenders use their own tax calculator rather than your actual take-home pay, which can create discrepancies if you have salary sacrifice arrangements.
Step 3: Deduct Committed Expenditure
All contractual financial commitments are deducted:
- Existing mortgage or rent payments (unless being replaced)
- Loan repayments (car finance, personal loans)
- Credit card minimum payments (typically 3–5% of balance)
- Student loan repayments (Plan 1, 2, 4, or 5 — calculated on income)
- Child maintenance payments
- Hire purchase agreements
- Buy Now Pay Later commitments (increasingly scrutinised)
Step 4: Deduct Essential Living Costs
Lenders use either declared expenses or statistical models (often based on ONS data) — whichever is higher. Categories include:
- Council tax (based on property band)
- Utilities (gas, electricity, water)
- Food and housekeeping
- Transport costs
- Childcare and school fees
- Insurance premiums
- Communication (phone, broadband)
- Clothing
Step 5: Calculate Disposable Income
Net income minus committed expenditure minus essential costs equals disposable income. The proposed mortgage payment (stressed — see below) must fit within this amount with a buffer.
Step 6: Apply the Stress Test
The proposed repayment is calculated not at the product rate you're applying for, but at a higher stressed rate to ensure you could cope with rate rises.
The Affordability Formula (Simplified)
| Element | Example (Single Applicant, £45,000 Salary) |
|---|---|
| Gross annual income | £45,000 |
| Net monthly income | £2,851 |
| Less: committed expenditure | −£350 (car finance £200, credit card £150) |
| Less: essential living costs | −£1,100 (ONS-based estimate) |
| Disposable income | £1,401 |
| Maximum stressed mortgage payment | ~£1,200 (leaving buffer) |
| Approximate maximum loan (at stressed rate ~7%) | ~£195,000 over 30 years |
| Income multiple equivalent | 4.33× |
Notice the effective multiple is lower than the headline 4.5× because committed debts eat into capacity. This is why clearing debt before applying has such a powerful effect.
The Stress Test Explained
The stress test is the single biggest factor that limits borrowing. Understanding it helps you plan realistically.
How the Stress Test Works
Lenders must verify you can afford repayments at a rate higher than the one you're applying for. The stress rate is typically:
| Product Type | Stress Test Rate | How It's Calculated |
|---|---|---|
| Fixed rate (2–5 years) | Lender's SVR + 1–2% | Currently ~7.5–8.5% at most lenders |
| Fixed rate (5+ years) | Pay rate or pay rate + 0.5–1% | Reduced stress for longer fixes |
| Variable/tracker rate | Pay rate + 2–3% | Higher stress due to immediate rate risk |
Why Longer Fixes Can Increase Borrowing
A 5-year fixed rate at 4.2% might be stressed at only 4.7–5.2% (pay rate plus a small buffer), while a 2-year fix at 3.9% could be stressed at 7.5% (SVR plus margin). The lower stress rate on the longer fix means higher maximum borrowing — sometimes £20,000–£40,000 more. This is a legitimate strategy for maximising affordability, though you'll typically pay a slightly higher initial rate.
The Bank of England's Role
The Bank of England withdrew its formal affordability test recommendation (the "+3% above SVR" rule) in June 2023, giving lenders more flexibility. However, most lenders have kept similar internal stress tests. The withdrawal means there's now more variation between lenders, which is why shopping around (or using a broker) matters more than ever.
Impact of Base Rate Changes
| Base Rate Environment | Typical SVR | Stress Test Rate | Effect on Borrowing |
|---|---|---|---|
| Low (0.1–0.5%) | 3.5–4.5% | 5.5–6.5% | Higher maximum borrowing |
| Medium (3–4%) | 6–7.5% | 7.5–9% | Moderate borrowing capacity |
| High (5%+) | 7.5–9% | 8.5–10%+ | Significantly reduced borrowing |
How Different Income Types Are Treated
Employed (PAYE)
The simplest scenario. Lenders want:
- 3 months' payslips
- Latest P60
- Employer's reference confirming role, salary, and contract type
- Probation periods: some lenders decline during probation, others accept if you've passed or have an unconditional contract
Self-Employed (Sole Trader or Partnership)
| Requirement | Detail |
|---|---|
| Trading history | Minimum 2 years (some accept 1 year with strong accounts) |
| Documents needed | SA302 tax calculations + tax year overviews for 2–3 years |
| Income calculation | Average of last 2–3 years' net profit, or latest year if higher (lender-dependent) |
| Accountant | Qualified accountant reference may be required (ICAEW, ACCA, CIMA) |
Key tip: If your most recent year's profit is significantly higher than previous years, seek a lender that uses the latest year rather than an average. A broker can identify these lenders quickly.
Company Directors (Ltd Company)
This is where it gets complex. Lenders assess income differently:
| Approach | How Income Is Calculated | Best For |
|---|---|---|
| Salary + dividends | Director's salary plus dividends drawn | Directors who extract most profit as dividends |
| Salary + share of net profit | Salary plus proportionate share of company profit | Directors who retain profit in the company |
| SA302 only | Whatever is declared on personal tax return | Directors with simple tax affairs |
The "salary + share of net profit" approach often produces the highest borrowing figure because retained profits count even if you haven't drawn them. Not all lenders offer this — a broker is essential for Ltd company directors.
Contractors
| Scenario | Lender Approach |
|---|---|
| Day-rate contractor (IT, engineering, etc.) | Some lenders annualise day rate × 5 × 46–48 weeks as income |
| Fixed-term contract | Must have 12+ months remaining or evidence of contract renewals |
| Umbrella company | Treated as employed — use payslips |
| IR35 inside | Treated as employed for tax but lender approach varies |
Contractor-friendly lenders can dramatically increase borrowing. A contractor earning £500/day could borrow based on ~£115,000 annualised income with the right lender, versus only £40,000–£50,000 if a high-street lender uses their Ltd company salary of £12,570.
Zero-Hours Contracts
Accepted by fewer lenders, but possible with:
- 12+ months in the same role
- Consistent earnings shown on bank statements
- Average income calculated over 6–12 months
Multiple Income Sources
If you have a primary job plus freelance income, rental income, or a second job, different lenders treat the combination differently. Some will only consider your primary income; others will add secondary sources if evidenced over 12+ months.
Expenditure: What Lenders Deduct
Committed Expenditure (Contractual)
These are deducted pound-for-pound from your disposable income:
| Commitment | How It's Assessed | Impact on Borrowing (approximate) |
|---|---|---|
| Car finance (PCP/HP) | Monthly payment × remaining term | £300/month = ~£45,000 less borrowing |
| Personal loan | Monthly repayment | £200/month = ~£30,000 less borrowing |
| Credit card balance | 3–5% of balance as assumed payment | £5,000 balance = ~£22,000–£37,000 less borrowing |
| Student loan | Calculated on income (Plan 2: 9% over £27,295) | £45,000 salary = ~£133/month = ~£20,000 less borrowing |
| Child maintenance | Court order or CMS amount | Direct deduction from disposable income |
| Buy Now Pay Later | Increasingly counted as committed spend | Varies — some lenders now check BNPL via Open Banking |
Essential Living Costs
Lenders use either your declared costs or ONS statistical benchmarks — whichever is higher. The ONS-based model typically assumes:
| Category | Single Person (Approx/Month) | Couple (Approx/Month) | Family with 2 Children (Approx/Month) |
|---|---|---|---|
| Food/housekeeping | £250–£350 | £400–£500 | £550–£700 |
| Utilities | £150–£200 | £180–£230 | £200–£280 |
| Council tax | £120–£180 | £120–£180 | £120–£180 |
| Transport | £150–£250 | £200–£350 | £250–£400 |
| Clothing | £30–£50 | £50–£80 | £80–£120 |
| Communication | £40–£60 | £50–£70 | £60–£80 |
| Childcare/school fees | — | — | £200–£1,500+ |
| Insurance | £30–£50 | £40–£60 | £50–£80 |
| Total estimate | £770–£1,140 | £1,040–£1,470 | £1,510–£3,340 |
Key insight: Childcare costs are the single biggest affordability killer. A family paying £1,200/month in nursery fees could see borrowing capacity reduced by £150,000–£180,000 compared to a family with school-age children. If childcare costs will end within 1–2 years, some lenders will discount them — ask your broker.
Costs Lenders Usually Ignore
- Subscriptions (Netflix, Spotify, gym) — unless excessive
- Savings contributions
- Charitable donations
- Holiday spending
However, if your bank statements show gambling transactions, this is a major red flag that can lead to immediate decline regardless of affordability numbers.
New Build–Specific Affordability Factors
Several factors unique to new builds affect affordability calculations:
Service Charges and Ground Rent
| Factor | How It Affects Affordability |
|---|---|
| Annual service charge | Deducted as committed expenditure — £2,400/year = £200/month deduction = ~£30,000 less borrowing |
| Ground rent (pre-June 2022 leases) | Deducted as committed expenditure — watch for escalating ground rents |
| Ground rent (post-June 2022 leases) | Peppercorn (zero) under Leasehold Reform Act 2022 — no impact |
| Estate management charges (freehold houses) | Some lenders deduct these; others ignore them |
New build flats with high service charges (£3,000–£5,000/year is common in developments with lifts, concierge, or communal gardens) face a double affordability hit: the charge reduces borrowing capacity, and many lenders also restrict LTV on new build flats to 85%.
Developer Incentives
Developers commonly offer incentives worth 3–5% of the purchase price. Lenders treat these differently:
| Incentive Type | Lender Treatment |
|---|---|
| Cashback / deposit contribution | Deducted from property value for LTV calculation — e.g., £300,000 home with £10,000 cashback is valued at £290,000 |
| Stamp duty paid | Generally acceptable up to 5% of price without valuation adjustment |
| Upgrades (flooring, kitchen) | Usually acceptable as they add value to the property |
| White goods / furniture packages | May be deducted from value if excessive |
| Combined incentives over 5% | Most lenders deduct the excess from the property valuation |
The New Build Premium
New builds typically sell at 10–20% above comparable second-hand properties. Lenders are aware of this. Their panel valuers may down-value the property, which doesn't directly affect affordability but can reduce the maximum loan via LTV limits. If a £350,000 new build is valued at £320,000, a 90% LTV loan drops from £315,000 to £288,000 — and you'd need to find an extra £27,000 in deposit.
New Build Energy Efficiency
Some lenders now offer "green mortgage" rates or enhanced borrowing for energy-efficient homes. New builds rated EPC A or B may qualify for:
- Lower interest rates (0.1–0.2% discount)
- Cashback on completion (£500–£1,000)
- Higher income multiples (up to 5.5× at selected lenders)
Since most new builds achieve EPC B or above under current Building Regulations Part L, this is worth exploring.
Government Schemes and Affordability
Shared Ownership
You buy a share (25–75%) and pay rent on the remainder. Affordability is assessed on:
- Mortgage repayments on your purchased share
- Rent on the housing association's share (typically 2.75% of their share's value per year)
- Service charges
- All three combined must be affordable under stress tests
Income caps apply: household income must be £80,000 or below in England (£90,000 in London). Fewer lenders operate in this market — about 15–20 offer shared ownership mortgages.
First Homes
Properties sold at 30–50% discount to local first-time buyers. Affordability is assessed on the discounted price, making the mortgage smaller. However, the discount is locked to the property forever, which can affect future remortgaging and resale.
Deposit Unlock
A scheme where developers pay for insurance that allows lenders to offer 95% LTV on new builds (normally capped at 85–90%). This doesn't change the affordability calculation but removes the LTV barrier that often restricts new build buyers.
Lifetime ISA (LISA)
Save up to £4,000/year with a 25% government bonus (£1,000/year). The LISA doesn't affect affordability calculations but increases your deposit, which can improve LTV and access to better rates. Maximum property price: £450,000.
Forces Help to Buy
Armed forces personnel can borrow up to 50% of salary (max £25,000) interest-free for 10 years. Most lenders treat the Forces loan repayment as committed expenditure, so it reduces borrowing capacity by the monthly repayment amount.
Help to Buy Equity Loan (Closed)
This scheme closed to new applications in October 2022 (completions by March 2023). If you purchased under this scheme, the equity loan affects remortgaging affordability — see our remortgaging guide for details.
Joint Applications and Borrowing Power
Standard Joint Application (2 Applicants)
Both incomes are combined, but so are both sets of expenditure. The net effect depends on the second applicant's income relative to their debts:
| Scenario | Impact |
|---|---|
| Both earn well, minimal debts | Borrowing roughly doubles vs single applicant |
| Second earner has high debts | Their debts may offset their income, adding little or reducing capacity |
| One earner, one non-earner | No income benefit, but additional dependant costs may apply |
Joint Borrower Sole Proprietor (JBSP)
A parent (or other family member) joins the mortgage to boost affordability but is not on the property title. This means:
- The parent's income is included in the affordability calculation
- The parent does not own a share of the property
- The parent doesn't pay stamp duty surcharge (they're not buying a property)
- Available from lenders including Barclays, Halifax, and several building societies
- Typically up to 4 applicants (though only 1–2 go on the title)
This can increase borrowing by £50,000–£150,000 depending on the supporting party's income and debts.
Guarantor Mortgages
A family member guarantees the mortgage (and may need to secure it against their own property or savings). These are rarer but still available from some building societies. The guarantor's income and assets support the affordability calculation.
How to Maximise Your Borrowing Capacity
These strategies are ranked by impact — highest first:
1. Clear Debt Before Applying
Every £100/month of committed expenditure you eliminate adds approximately £15,000 to your borrowing capacity. Prioritise:
| Action | Monthly Saving | Approximate Borrowing Increase |
|---|---|---|
| Pay off £5,000 credit card | £150–£250 | £22,000–£37,000 |
| Settle £8,000 car finance | £250–£350 | £37,000–£52,000 |
| Clear £3,000 personal loan | £100–£150 | £15,000–£22,000 |
| Close unused credit cards | £0 (but removes risk) | £0–£5,000 (some lenders count limits) |
Important: Clear debts at least 1–2 months before applying so the clearance shows on your credit file and bank statements.
2. Choose a Longer Fixed Rate
A 5-year or 10-year fix reduces the stress test rate, potentially adding £20,000–£40,000 to borrowing capacity. The trade-off is a slightly higher initial rate and longer commitment.
3. Extend the Mortgage Term
A 35-year term produces lower monthly payments than a 25-year term, improving affordability. Many lenders now offer terms up to 40 years. However, you'll pay significantly more interest over the life of the loan, and most lenders require the term to end before you reach 70–75.
4. Use a Specialist Broker
Brokers with access to the whole market can identify lenders whose affordability models favour your specific circumstances. A contractor, company director, or applicant with complex income could see borrowing vary by £50,000–£100,000 between lenders.
5. Consider JBSP or Family Support
Adding a parent's income via Joint Borrower Sole Proprietor can increase borrowing by £50,000–£150,000 without them owning the property.
6. Maximise Deposit
A larger deposit doesn't directly improve affordability, but it removes the LTV constraint. If LTV is your binding limit (common with new builds), every extra £1,000 of deposit translates to roughly £1,000 more property value you can target.
7. Reduce Declared Expenditure (Honestly)
Review your bank statements for 3–6 months before applying. Cancel unused subscriptions, reduce discretionary spending, and ensure your accounts show a responsible spending pattern. Lenders will scrutinise your statements.
8. Professional Mortgages
If you're a doctor, dentist, lawyer, accountant, vet, or qualified professional, some lenders offer enhanced income multiples (5–5.5×) and reduced deposit requirements. These schemes recognise higher future earning potential.
Common Mistakes That Reduce Affordability
| Mistake | Why It Hurts | How to Avoid |
|---|---|---|
| Applying with multiple credit card balances | Each balance creates a monthly deduction (3–5% of balance) | Pay down or consolidate before applying |
| Taking out new credit within 6 months | Hard searches and new commitments reduce score and capacity | Freeze all new credit applications |
| Gambling transactions on statements | Many lenders auto-decline regardless of amounts | Stop all gambling 6+ months before applying |
| Overdraft usage at statement dates | Suggests cash flow problems | Stay out of overdraft for 3 months before applying |
| Not declaring all income sources | Undercounts your capacity | Provide evidence of all regular income |
| Forgetting Buy Now Pay Later agreements | These increasingly show on credit files and Open Banking | Clear all BNPL before applying |
| Applying to the wrong lender | Lender models vary by £40,000+ | Use a whole-of-market broker |
| Choosing the cheapest 2-year fix | Highest stress test = lowest borrowing | Compare 5-year fixes for better affordability |
| Not disclosing childcare ending soon | Some lenders will discount ending childcare costs | Mention to broker — some lenders factor this in |
Worked Examples: What Can You Actually Borrow?
Example 1: Single First-Time Buyer
| Factor | Detail |
|---|---|
| Salary | £35,000 |
| Debts | None |
| Dependants | None |
| Deposit | £25,000 (LISA savings) |
| Estimated max borrowing | £155,000–£175,000 |
| Max property value (90% LTV new build) | £180,000–£200,000 |
Example 2: Couple with Combined Income
| Factor | Detail |
|---|---|
| Combined salary | £72,000 (£42,000 + £30,000) |
| Debts | Car finance £280/month |
| Dependants | 1 child, no childcare costs (school age) |
| Deposit | £40,000 |
| Estimated max borrowing | £280,000–£310,000 |
| Max property value (90% LTV new build) | £320,000–£350,000 |
Example 3: Self-Employed Company Director
| Factor | Detail |
|---|---|
| Salary + dividends | £12,570 + £38,000 = £50,570 |
| Company net profit (their share) | £85,000 |
| Debts | £15,000 credit card, £200/month loan |
| Deposit | £60,000 |
| Borrowing (salary + dividends lender) | £180,000–£210,000 |
| Borrowing (salary + profit share lender) | £320,000–£380,000 |
| Difference from choosing the right lender | £140,000–£170,000 |
This example illustrates why broker selection is critical for company directors. The "wrong" lender could leave you £170,000 short of your potential borrowing.
Example 4: Family with High Childcare Costs
| Factor | Detail |
|---|---|
| Combined salary | £90,000 (£55,000 + £35,000) |
| Childcare | £1,400/month (2 children in nursery) |
| Debts | None |
| Deposit | £50,000 |
| Borrowing with childcare | £280,000–£320,000 |
| Borrowing once children start school | £400,000–£440,000 |
| Lost capacity due to childcare | £100,000–£120,000 |
If your children are starting school within 12 months, some lenders will reduce or remove the childcare deduction. This can dramatically increase borrowing — speak to a broker about which lenders offer this flexibility.
How Different Lenders Approach Affordability
Without naming specific products (which change frequently), here's how different lender types typically compare:
| Lender Type | Income Multiple | Stress Test | Expenditure Model | Best For |
|---|---|---|---|---|
| Big 4 banks | 4.0–4.49× | SVR + 1–2% | ONS-based, conservative | Straightforward PAYE applications |
| Challenger banks | 4.5–5.0× | Varies, sometimes lower | May use declared expenditure | Higher earners, complex income |
| Building societies | 4.0–5.5× | Often more flexible | Individual assessment common | Self-employed, unusual circumstances |
| Specialist lenders | 4.5–6.0× | Product-specific | Detailed manual underwriting | Company directors, contractors, professionals |
The difference between the most and least generous lender for the same applicant can be £40,000–£170,000. This is not about being irresponsible — it's about different models weighting the same data differently.
What to Do If You're Told You Can't Afford Enough
Immediate Actions
- Don't apply elsewhere immediately — multiple applications in a short period create hard searches that damage your credit score
- Get a detailed explanation — lenders must tell you why you were declined or offered less than requested
- Speak to a whole-of-market broker — they can identify which lender's model suits your profile
- Check your credit file — errors on Experian, Equifax, or TransUnion could be limiting you
Medium-Term Strategies
| Strategy | Timeline | Potential Impact |
|---|---|---|
| Clear credit card debt | 1–3 months | +£22,000–£37,000 per £5,000 cleared |
| Settle car finance | Immediate if funds available | +£37,000–£52,000 |
| Wait for pay rise / new job | 3–6 months | Depends on increase |
| Build additional deposit | 6–12 months | Removes LTV constraint |
| Add family member via JBSP | Immediate | +£50,000–£150,000 |
| Switch to longer fixed rate | Immediate | +£20,000–£40,000 |
When to Consider a Different Property
If your maximum borrowing plus deposit falls significantly short of new build prices in your area, consider:
- A different development with lower prices or service charges
- A new build house instead of a flat (lower service charges, potentially higher LTV)
- Shared ownership to reduce the mortgage needed
- First Homes if available in your area (30–50% discount)
- A different location where new builds are priced within your range
Frequently Asked Questions
Do new build mortgages have different affordability rules?
The core affordability calculation is the same, but new build–specific factors like service charges, ground rent, developer incentives, and restricted LTV ratios create additional constraints. High service charges on new build flats can reduce borrowing by £30,000–£50,000 compared to a freehold house at the same price.
How much can I borrow on a £40,000 salary?
Roughly £160,000–£200,000 depending on debts, expenditure, lender, and product choice. With zero debts, a 5-year fix, and a favourable lender, you could reach the higher end. With £300/month of existing commitments, expect closer to £150,000.
Does student loan debt affect how much I can borrow?
Yes. Student loan repayments are deducted as committed expenditure. On a £40,000 salary, Plan 2 repayments are approximately £95/month, which reduces borrowing by roughly £14,000. Plan 1 repayments are higher (lower threshold), reducing borrowing by more.
Will a lender count my partner's income if we're not married?
Yes. Marital status doesn't affect joint mortgage applications. Both applicants' incomes and debts are assessed equally whether you're married, in a civil partnership, or unmarried partners.
Can I improve my affordability without earning more?
Yes — clearing debt, choosing a longer fix, extending the mortgage term, using a specialist broker, and adding a family member via JBSP can all increase borrowing without any change to your salary. See the maximising borrowing section above.
How far in advance should I check affordability?
Get an Agreement in Principle (AIP) 3–6 months before you plan to reserve a property. This gives you time to address any issues (clear debts, correct credit file errors, build deposit) before the formal application. An AIP typically lasts 60–90 days and involves a soft or hard credit search depending on the lender.