How Secured Loan Lenders Assess Your Affordability

The MCOB 11 affordability framework

MCOB 11.6 sets the overarching affordability standard for regulated mortgages including second charge. The lender must assess the consumer’s ability to pay based on: current and committed income and expenditure, reasonable lifestyle expectations, the effect of future interest rate rises (stress test), and contingencies such as changes in household circumstances. The assessment must cover the full loan term, not just the initial period.

The assessment is typically performed through an automated system within the lender’s underwriting platform, with human underwriter review on any case that has complexity or flags. The system ingests declared income (cross-referenced to payslips/SA302s), declared expenditure (cross-referenced to bank statements), existing credit commitments (from credit file), and the proposed new loan payment. It outputs a net disposable income (NDI) figure and compares this against a minimum threshold.

Minimum NDI thresholds vary by household. Typical lender requirements: £300 per month for single borrower with no dependants, £500 for joint application with no dependants, £600 for household with one dependant child, £700 for two dependants, £800 for three or more. NDI below threshold means decline, regardless of income level. Specialist lenders are not more generous on NDI thresholds than high-street banks — but are more flexible on how income is calculated.

How employed income is calculated

For PAYE employees, basic gross salary is the starting point, sourced from payslips and verified against your P60. Regular allowances paid monthly (shift allowance, London weighting, car allowance at 50%) are added to basic salary. Overtime is treated by averaging the last 6 to 12 months — verified from payslips and matched to bank credits. Bonus is averaged over 12 months.

Complex cases: Commission-based income requires 2 years of evidence. Sales people working heavily on commission often have the commission element averaged rather than taken at current rate. Salary sacrifice schemes (pension, childcare vouchers) reduce effective gross pay — some lenders add back the pension contribution as affordability evidence (arguing it demonstrates savings capacity), others take it at face value.

Recent starters: Less than 3 months in current employment creates complication. Most specialists require 3+ months in role with exception for industry-continuity cases (moved from one IT firm to another at higher pay). Probationary contracts are typically declined — wait until probation confirmed before applying. Pay rises immediately before application create opportunity: if your latest payslip shows new salary but the previous two show old, provide employer confirmation letter of new salary effective date and use higher figure for affordability.

How self-employed income is calculated

Self-employed sole traders: lenders take the average or most recent of 2 years of SA302 declared net profit (profit after expenses but before income tax). The standard is latest year for growing income, average of 2 years for stable income, average of 3 years if lender concerned about sustainability. HMRC-issued SA302s and corresponding Tax Year Overviews are cross-checked for internal consistency.

Limited company directors: three assessment methodologies are possible, each producing different figures. Salary plus dividends (conservative, lower capacity): director’s declared salary plus declared dividend on SA302. Used by Shawbrook and most high-street lenders. Salary plus net profit (moderate, higher capacity): director’s salary plus company net profit after corporation tax. Used by Precise Mortgages, UTB (discretionary), and Together. Salary plus retained profit (most generous, highest capacity): director’s salary plus net profit kept in the company. Used by Precise Mortgages systematically.

Contractor day-rate calculation: most specialists use day rate × 5 days × 46 weeks to produce an annualised figure. A £500/day contractor: £500 × 5 × 46 = £115,000. This generous calculation acknowledges that contractors typically work less than 52 weeks due to gaps between contracts. Documentation required: current contract and at least 12 months of contracting history. Some lenders (UTB, Precise) apply a 4.5× multiplier to this figure; others use 4× or 4.25×.

How expenditure is assessed

Lenders compare your stated monthly expenditure against three sources: your bank statements (actual spending patterns), ONS regional expenditure data (statistical averages for household size and location), and your credit file commitments. Each source reveals different aspects of real spending.

Lenders use the higher of your stated expenditure and ONS regional averages — so understating expenditure doesn’t improve your affordability if ONS benchmarks are higher. Bank statements are scrutinised for patterns the underwriter wouldn’t otherwise see: gym memberships, streaming subscriptions, car finance that didn’t appear on credit file, regular cash withdrawals of unknown purpose, gambling activity.

Stress testing and interest rate rises

Under MCOB 11 rules, lenders must stress-test affordability against future interest rate rises. The stress rate methodology varies by lender but is typically the higher of (initial rate + 3%) or a fixed floor (usually 8.5% or the lender’s standard variable rate + 1%). On a 9% initial rate, affordability is typically tested at 12%. On a 7% rate, affordability is tested at 10% or 8.5% floor.

The stress test’s practical effect is to reduce the maximum loan affordability by 10% to 25% versus payment-at-initial-rate calculation. On a £50,000 loan over 15 years at 9% initial, monthly payment is £507; at 12% stress rate, payment is £600 — lenders test against the £600 figure when calculating NDI. This prevents borrowers committing to payments that become unaffordable if rates rise materially during the fixed-rate period.

For short-fix products (2 or 3-year fix), the stress test matters more because rates can vary widely during the remaining term. For longer fixes (5 or 10-year), stress testing is less critical in practice but still required by MCOB. Interest-only or RIO products face particularly stringent stress testing because the full balance remains outstanding for longer — test rates can be 3% to 5% above initial rather than 3%.

Net disposable income calculation

Net disposable income (NDI) is the final affordability metric. It is calculated as: monthly net (take-home) income, minus first mortgage payment, minus new secured loan payment at stress rate, minus all other credit commitments (credit cards at 5% of balance, loans at contractual payment, car finance, BNPL), minus household expenditure (the higher of declared or ONS benchmark), minus any maintenance or alimony payments.

The result must exceed minimum NDI thresholds: typically £300 to £800 per month depending on household size and lender. Some lenders (Shawbrook, Precise) apply higher minimums (£500 single, £800 family) reflecting more conservative credit risk appetite. Others (Together, Pepper Money) apply standard minimums (£300 single, £500 family).

Worked NDI example: Single borrower earning £45,000 gross, net £2,850/month. First mortgage £650, new secured loan at stress rate £450, credit cards 5% of £3,000 balance = £150, no car finance. ONS benchmark single-adult expenditure £715/month. NDI = £2,850 – £650 – £450 – £150 – £715 = £885. Comfortably above the £300 single-borrower threshold. This case passes affordability with room to spare — borrower could potentially afford more borrowing within same income.

Common reasons for affordability failure

Failure reason one: undisclosed credit commitments. The credit file shows commitments the borrower didn’t declare — car finance, guaranteed BNPL, joint credit with partner. These get added to the commitment pot and push NDI below threshold. Always provide complete commitment disclosure at fact-find; surprises at underwriting are worse than disclosed items.

Failure reason two: expenditure higher than declared. Bank statements show £450 monthly grocery spend but borrower declared £250. The underwriter re-runs affordability using higher bank-statement figure, reducing NDI below threshold. Be accurate rather than optimistic when declaring expenditure — underwriters will find the truth from statements anyway.

Failure reason three: short-term income spikes overused. Applicant earned £65,000 in the most recent tax year due to large bonus; previous years averaged £45,000. Broker used £65,000 in the fact-find; underwriter uses £45,000 average. Loan size requested on £65,000 doesn’t pass affordability on £45,000. Always use sustainable income figure, not peak. Failure reason four: high credit utilisation. Applicant has £20,000 credit card balance against £25,000 limit. 5% commitment rule adds £1,000 monthly to calculation — devastating to NDI. Pay down card balances below 30% of limit before applying to reduce the commitment load.

How to maximise affordability for your application

Pay down revolving credit balances. Credit cards used as commitments at 5% of balance — on £15,000 balances that’s £750/month eating affordability. Paying cards to £2,000 total balance reduces commitment to £100/month, freeing £650 NDI headroom. Similarly, close unused credit card and store card accounts (but only after the secured loan completes, otherwise temporary score dip can cause decline).

Clear or consolidate small expensive debts before applying. A £6,000 personal loan with £180/month payments takes £180 out of NDI even after the loan money settles bigger debts. If the loan is consolidated through the new secured loan, its commitment drops to zero post-completion — but underwriters assess pre-completion position. Small unsecured debts consolidated into the main secured loan don’t count against NDI because they’re being settled at completion.

Time applications around strongest income evidence. If you’re expecting a pay rise, delay application until the new salary shows on 3 months of payslips. If you’re self-employed and the current year is stronger than the previous, consider waiting until you’ve filed the current year SA302 (5 April to 30 October submission window) before applying. If you’re on track for a bonus, applications made after bonus has been paid and banked show stronger income than before.