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Contractor mortgages IR35 how to borrow more using your day rate

Getting your contractor income presented correctly

Most mainstream lenders will consider contractor income, so a contractor mortgage UK is well within reach — but how your income is presented to the lender makes all the difference. If your application is submitted with payslips that reflect a tax-efficient umbrella or limited company structure, the lender may underestimate your real earning capacity. London FS ensures your income is presented in the right format to the right lender from the outset.

The most effective approach is the day-rate method, which most contractor-friendly lenders use:

The day-rate formula: Day rate × 5 days × annualised weeks = income. Different lenders use different week counts — some use 46 weeks and others 48 weeks.

  • Example (46 weeks): £500/day × 5 × 46 = £115,000 annualised income
  • Example (48 weeks): £500/day × 5 × 48 = £120,000 annualised income

London FS will identify which lenders offer the most favourable assessment for your specific day rate and contract. Once you know your annualised figure, you can estimate monthly costs with our mortgage repayment calculator.

Inside vs outside IR35 — does it affect your mortgage?

Your IR35 position changes how an IR35 mortgage is assessed, but it rarely stops one.

Outside IR35 (PSC / limited company)

Most specialist contractor mortgage lenders treat outside IR35 contractors very favourably. Income is assessed on a day rate mortgage basis, and the tax-efficient salary/dividend structure doesn’t penalise you the way it does with mainstream lenders.

Inside IR35 (umbrella company)

Inside IR35 adds a layer of complexity — your umbrella company payslip shows income after employer NI deductions, which can look lower than your actual earnings. An umbrella company mortgage is still very achievable: specialist lenders understand this and can gross up the income appropriately. Being inside IR35 does not block a mortgage.

2026 IR35 update: small company threshold change. From April 2026, the small company threshold increased (turnover up to £15m). This means some contractors whose clients were previously classified as medium-sized companies can now self-assess for IR35 again. Review your contract before your next mortgage application.

What lenders look for

  • Current contract: a signed contract showing day rate, start date and end date.
  • Contract history: 12–24 months of continuous or near-continuous contracting. Short gaps (4–6 weeks) are acceptable.
  • Bank statements: 3–6 months showing day-rate income being deposited.
  • Accountant’s letter: for limited company contractors, confirming trading history and day rate.

Contractor profiles and how they’re assessed

Contractor typeHow income is assessedLender pool
IT contractor, outside IR35, PSCDay rate × 5 × 46 or 48 weeks (varies by lender)Wide — most specialist lenders
Finance contractor, umbrella, inside IR35Gross umbrella income (deductions added back)Moderate — specialist lenders who understand umbrella
Locum GP / nurse, bank shiftsAnnualised from average monthly earnings over 3–12 monthsModerate — London FS can assist
Consultant, PSC, fixed-term clientDay rate × 5 × 46 or 48 weeks (varies by lender), with contract expiry notedGood — strong contracts carry significant weight

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