What's the Minimum Income for an Interest-Only Mortgage?
- 3 days ago
- 10 min read
See whether your income clears the typical £75k single / £100k joint bar most UK lenders apply, and what matters more than the number itself.
Quick Answer
Most UK lenders require a minimum gross income of £75,000 per year for a sole applicant, or £100,000 combined for joint applicants where one earner is typically on at least £75,000. A smaller group of lenders sit lower (some at £50,000, some with no formal minimum), and a few specialist lenders go higher (£150,000+) for the most premium products. The income threshold is only one gate, though. Lenders also require a credible repayment vehicle (ISA, pension, investments, or property sale plan), maximum LTV of 50-75%, and meaningful equity in the property. A high earner with no clear repayment plan often gets declined; a moderate earner with a strong, documented vehicle and 50% equity often gets approved.
Reviewed by Ben Stephenson, FCA authorised (FRN 496907) · 25+ years' experience · 4.9★ on Google. Updated: 6 May 2026.
Who Is This Guide For
Best for mid-market earners on £60,000-£100,000 wondering whether they qualify for interest-only at all, established professionals with bonus or commission income that pushes them across the £75,000 threshold on paper, and homeowners with significant equity who want to free up monthly cashflow without selling the property.
Key Points
£75k single or £100k joint is the typical mainstream threshold
Repayment vehicle often matters more than the income figure
Bonus and commission can lift you over the bar at 50-100% weighting
Table of Contents
The headline income numbers in 2026
UK lender income minimums for residential interest-only have settled into a fairly consistent pattern since the post-2014 tightening. Most mainstream lenders sit at £75,000 for a sole applicant or £100,000 combined on a joint application, with the joint requirement typically expecting at least one earner to clear the £75,000 mark on their own. A smaller group of lenders runs no formal income minimum and tests affordability instead. A few premium-product lenders push the threshold higher to £150,000 or beyond.
Approximate 2026 lender categories and the income minimum they typically apply:
Lender category | Typical minimum income |
Most high street lenders | £75,000 single / £100,000 joint |
Building societies leaning on affordability | No formal minimum; case-by-case |
Lower-threshold mainstream lenders | £50,000 single / £75,000 joint |
Premium / private bank lenders | £150,000+ with significant assets |
These figures are illustrative rather than a live rate sheet. Lender criteria shift over time and individual lenders apply different rules to bonus, commission, and self-employed income, so a borrower on £70,000 base with £15,000 of regular bonus might cross the threshold at one lender and miss it at another.
Why lenders set an income minimum at all
Income minimums on interest-only mortgages are a regulatory hangover from the post-2014 Mortgage Market Review tightening. After the FCA review of pre-2014 lending standards found that hundreds of thousands of interest-only borrowers had no realistic plan to repay capital at term end, lenders introduced stricter front-end gates: minimum income, minimum equity, and a documented repayment vehicle. The income gate filters out borrowers most likely to struggle with the open-ended nature of an interest-only loan, where capital is never amortised down by the monthly payment.
Under Consumer Duty rules, lenders also have to evidence that interest-only is genuinely in the borrower's interest. The income test does some of that work because higher earners typically have more disposable income to build the repayment vehicle alongside the mortgage payment. A borrower on £35,000 paying interest-only on a £250,000 mortgage would have no realistic capacity to fund the eventual capital repayment from disposable income, which is the FCA's policy concern.
Underwriters typically weigh three things in combination: the income figure relative to the loan size, the credibility of the repayment vehicle, and the equity buffer in the property at the application date. A £75,000 earner with a £400,000 home and £250,000 mortgage tends to read as the textbook profile; the same earner with a £400,000 home and £320,000 mortgage often gets pushed back to repayment or part-and-part.
Single vs joint income rules
On joint applications most lenders apply one of two rules. Either the higher earner has to clear the sole-applicant minimum on their own (typically £75,000), and the second income is then added in for affordability; or the combined income has to clear the joint minimum (typically £100,000) regardless of the split. The first rule is more common on the high street; the second is more common at building societies that lean on affordability.
The split between the two rules matters for couples with uneven incomes. A pair earning £80,000 + £35,000 (combined £115,000) qualifies under both rules. A pair earning £60,000 + £50,000 (combined £110,000) qualifies under the second rule but not the first, so the broker's job is to find a lender that uses the combined-income rule rather than the higher-earner rule.
Bonus, commission, and overtime are usually counted at 50-100% depending on consistency. Two to three years of payslips showing reliable bonus history typically gets weighted at 100%, while a single recent year is closer to 50%. Self-employed income works on a similar two-to-three-year averaging basis using SA302s and tax year overviews. Borrowers with strong bonus or commission income who are sub-threshold on basic salary alone often cross the bar comfortably once the variable income is added in.
The repayment vehicle requirement
The income threshold gets all the attention, but the repayment vehicle is often what actually decides interest-only applications. A credible vehicle is a documented plan showing how the capital balance will be cleared on or before the mortgage term ends. Lenders accept a defined list of vehicles and will not lend interest-only without one.
Acceptable repayment vehicles in 2026:
Stocks and shares ISAs and investment portfolios. Lenders typically want to see a current value already in place, plus realistic projected growth assumptions. The current pot has to be a meaningful proportion of the mortgage balance, not a notional plan to start saving.
Pension tax-free lump sum. Acceptable for borrowers approaching retirement, where the projected 25% tax-free cash from a defined contribution or final salary pension comfortably covers the mortgage at term end. The mortgage term has to align with retirement age.
Endowment policy. Increasingly rare in 2026 because new endowments are barely sold, but legacy policies still get used where the projected maturity figure clears the mortgage.
Sale of the mortgaged property (sometimes called downsizing). Acceptable if the projected equity at term end will be substantial. Most lenders want to see a minimum residual equity (often £150,000-£300,000) above the mortgage balance to qualify.
Sale of a second property, such as a buy-to-let. Treated similarly to property sale, with the lender needing evidence of unencumbered ownership or a clear repayment plan on the second property's mortgage.
Cash savings. Acceptable on smaller mortgages where the borrower can document a current savings balance plus a credible monthly contribution that closes any gap by term end.
What is not usually accepted: a vague intention to overpay each month, an inheritance you expect but is not yet bequeathed, future business sale proceeds without a documented sale path, or cryptocurrency holdings. Most lenders want vehicles with regulated reporting, projected values, and minimal correlation to the borrower's employment income.
How income, LTV, and repayment vehicle interact
Income is the entry gate but it does not work in isolation. Most UK lenders require a maximum LTV of 50-75% on residential interest-only, well below the 80-90% available on standard repayment mortgages. The lower LTV provides the lender with a bigger cushion if the repayment vehicle underperforms or fails entirely. A borrower at 50% LTV with a weak repayment vehicle is often a stronger underwriting case than a borrower at 75% LTV with a slightly better vehicle.
The three factors typically combine like this: a clean income above the threshold lets you in the door, a credible repayment vehicle keeps you in the application, and a low LTV gets you the best rate. A borrower who scores strongly on all three has the widest lender choice. A borrower who scores weakly on one of the three usually needs a specialist mortgage route, where the rate sits 0.3-0.8% above mainstream pricing in exchange for the relaxed criteria.
Part-and-part is the third route worth knowing. On a part-and-part mortgage, a portion of the loan is interest-only and the rest is repayment, which spreads the risk for the lender and often relaxes the income test on the interest-only portion. A £300,000 mortgage split as £150,000 interest-only plus £150,000 repayment can sometimes pass the affordability test where a full-IO £300,000 cannot. See the part-and-part guide for the trade-offs.
Worked example: a £85,000 earner exploring interest-only
Consider a 48-year-old professional earning a £85,000 base salary with reliable annual bonus of £18,000 over the last three years. They own a £650,000 home with an existing mortgage of £290,000 (44.6% LTV) and want to remortgage onto interest-only to free up cashflow during their children's university years.
On the income test, the £85,000 base alone clears the typical £75,000 sole-applicant threshold comfortably. Adding the £18,000 bonus at 75% weighting gives a recognised income of £98,500, which opens premium-product options too. The 44.6% LTV is well within the typical 50-75% interest-only ceiling, leaving a strong equity buffer for the lender.
The repayment vehicle is the deciding factor. The borrower has a workplace pension projected to deliver a £145,000 tax-free lump sum at age 60, an ISA portfolio currently valued at £85,000 with regular contributions, and a clear sale plan to downsize once the children leave home. Combined, the projected vehicles comfortably exceed the £290,000 balance. Most mainstream lenders would accept this file. Switching from repayment to interest-only would cut the monthly payment from roughly £1,650 to roughly £1,200 at current rates, freeing about £450 a month for the university years, and the borrower can convert back to repayment in seven years once the cashflow pressure ends.
Common myths about interest-only mortgages
Interest-only is one of the most misunderstood mortgage products in the UK. Five myths come up in almost every conversation:
Myth 1: Interest-only mortgages were banned after 2014. Reality: They were tightened, not banned. The Mortgage Market Review introduced minimum income, minimum equity, and repayment vehicle requirements, but interest-only is still widely available across mainstream and specialist lenders in 2026.
Myth 2: You need to earn £200,000+ to qualify. Reality: £75,000 single is the typical mainstream entry point, and a small group of lenders run lower thresholds at £50,000 or no formal minimum. The £200,000+ figure refers to premium private-bank products, not the broader mainstream market.
Myth 3: Interest-only is only for buy-to-let. Reality: Buy-to-let is overwhelmingly interest-only by default, but residential interest-only is alive and used routinely by professionals, semi-retired homeowners, and borrowers using cashflow flexibility for school fees, business cycles, or retirement planning.
Myth 4: The repayment plan can just be 'sell the house'. Reality: Sale of the property is sometimes accepted, but only with a substantial residual equity buffer, often £150,000-£300,000 above the mortgage balance at term end. A blanket 'we'll just sell' is not enough; lenders want documented projected equity and a realistic downsizing plan.
Myth 5: Interest-only always costs less than repayment. Reality: Monthly payments are lower because no capital is being repaid, but lifetime interest is meaningfully higher because the full balance keeps accruing interest for the entire term. The product makes sense when the cashflow flexibility has a specific purpose, less so when the borrower simply prefers a smaller monthly debit.
FAQs
What income do most UK lenders require for an interest-only mortgage in 2026?
Typical minimums are £75,000 gross per year for a single applicant, or £100,000 combined for joint applicants where one earner needs to be on at least £75,000. A small number of lenders sit lower at £50,000 or run no formal income minimum and lean on affordability instead. Specialist lenders sometimes accept lower incomes where the repayment vehicle is exceptional.
Does my repayment vehicle matter more than my income?
Often, yes. The income threshold is the entry gate, but lenders place greater weight on a credible repayment vehicle. Acceptable vehicles include ISAs, pensions, investment portfolios, endowments, and sale of the property if the equity buffer is large enough. Without a credible vehicle, even a £150,000 earner can be declined.
Can I get an interest-only mortgage as a first-time buyer?
On a residential mortgage, almost never. UK lenders treat interest-only as a remortgage or onward-purchase product for established homeowners with significant equity. Buy-to-let interest-only is widely available to first-time landlords, but residential interest-only as a first home is effectively closed to first-time buyers.
What if my income is just below the threshold?
A few options usually help. Apply jointly with a partner whose income closes the gap. Document bonus or commission income that the lender's standard pull may have missed. Or consider a part-and-part mortgage where the interest-only portion sits alongside a repayment portion, since the income test on a part-and-part is sometimes lighter than full interest-only.
Do bonus and commission count towards the income threshold?
Yes, but usually at a discount. Most lenders count 50-100% of regular bonus or commission depending on its consistency over two to three years. A salary of £65,000 with reliable £20,000 of annual bonus often crosses the £75,000 threshold for interest-only purposes. Irregular or single-year bonuses are weighted less heavily.
Will my interest-only mortgage automatically convert to repayment at the end of the term?
No. The mortgage runs as interest-only for the entire term and the full balance is due as a single payment on the final day. Most homeowners avoid that day either by redeeming the mortgage from their repayment vehicle (pension, investments, property sale) or by remortgaging onto a new product several years before term expires.
Summary
Most UK lenders apply a £75,000 single or £100,000 joint income minimum on residential interest-only mortgages in 2026, with a smaller group of lenders sitting at £50,000 or running on affordability without a formal threshold. The income gate matters but the repayment vehicle matters more: ISAs, pensions, investment portfolios, and property sale plans are all acceptable provided they are documented and the projected value clears the mortgage at term end. Lenders also cap LTV at 50-75% and prefer significant equity in the property. Borrowers just below the income threshold often qualify by adding bonus or commission, applying jointly, or switching to a part-and-part structure where some of the loan is repayment.
Updated: 6 May 2026
Written by Ben Stephenson, CeMAP-qualified Mortgage Broker.
Manor Mortgages Direct is FCA authorised, FRN 496907, has traded for nearly 30 years, is highly positively reviewed, 4.9 rated on Google, and has helped thousands secure the right mortgage. Bristol-based mortgage brokers, assisting clients nationwide.