Contractor Mortgage Affordability Calculator

Most high street lenders assess Ltd company directors on their PAYE salary, not their actual earning power. A contractor drawing £12,570 (the personal allowance, to minimise income tax) is assessed as a low earner, regardless of what flows through the company. Contractor-specialist lenders understand this structure and base affordability on the day rate formula instead: day rate × 5 days × 46 weeks. For a £600/day contractor, that is an annual income baseline of £138,000 rather than £12,570.

Specialist lenders use: annual income = day rate × 5 days × 46 billable weeks. They then apply an income multiple (4.5× to 5.5× for UK, 3.5× to 4.5× for Ireland) to calculate maximum borrowing. A £600/day contractor has a £138,000 baseline, giving a borrowing range of £621,000 to £759,000 from a specialist lender. A high street bank seeing a £12,570 director salary would offer roughly £56,000.

Yes, for the UK. Outside IR35 (Ltd company) contractors are assessed on the day rate formula by specialist lenders. Inside IR35 contractors via umbrella receive a PAYE payslip, which some lenders treat like a fixed-term employee. However, most specialist lenders now accept umbrella payslips and assess affordability on the gross contract rate, so the practical difference has narrowed. The key is choosing a lender who specialises in contractor underwriting.

Specialist lenders typically require: your current contract (usually at least 3 months remaining), 3 to 6 months of business bank statements showing contract income, the last 2 years of SA302 forms (UK) or Form 11 (Ireland) as supporting evidence, and proof of contracting history (2 or more years preferred). Some lenders accept first-time contractors if the role is in a field where you have prior permanent employment.

The industry standard is 46 weeks. This accounts for approximately 6 weeks of annual leave and bank holidays during which contractors typically do not bill. Most specialist lenders use 46 or 48 weeks as the income baseline. Using 52 weeks overstates income, and most underwriters cap it at 48 weeks regardless of evidence. The calculator defaults to 46 weeks, which is the most conservative and most widely accepted figure.

Some lenders allow you to add dividend income; others use only one method. For Ltd company contractors outside IR35, specialist lenders typically use the day rate formula alone, which already represents your full earning capacity. Adding dividends is sometimes possible and can increase borrowing, but only with lenders who explicitly support this approach. A specialist contractor mortgage broker can identify which lenders will maximise your position.

Not necessarily. Contractor-specialist mortgages have moved into the mainstream over the past decade. Many specialist lenders now offer rates comparable to standard products, particularly for contractors with a strong track record (2 or more years) and a current contract in place. The main difference is the underwriting methodology, not the interest rate. Some high street banks have also introduced contractor-friendly underwriting, though their criteria tend to be stricter.

UK specialist lenders typically use 4.5× to 5.5× the annual income baseline derived from the day rate formula. Some go up to 6× for high earners above £100,000. Ireland specialist lenders typically use 3.5× to 4.5×, in line with Central Bank macroprudential limits. The calculator shows the full range so you can plan for the most conservative and most generous lender scenarios.