IR35 Contractor Mortgages: What Inside and Outside IR35 Means for Your Application

Understanding IR35 and Your Mortgage

IR35 determines whether you're treated as an employee or a genuine contractor for tax purposes. Your IR35 status has a direct impact on how mortgage lenders assess your income, and getting it wrong can mean paying more — or being declined entirely.

Inside IR35 vs Outside IR35

Inside IR35 (Deemed Employment)

Your contract is inside IR35 if HMRC considers you a "disguised employee." You pay income tax and NI through your umbrella company or agency, similar to a permanent employee.

How lenders see it: Your income is treated like employment income. Lenders will look at your salary (from your payslips) and may accept your umbrella company's projected annual income. The challenge is that your take-home pay after tax and umbrella fees is often lower than your contract rate suggests.

Documents needed:

• Payslips (3–6 months)
• Umbrella company contract
• Bank statements showing regular payments

Outside IR35 (Genuine Contractor)

Your contract is outside IR35 if you operate through your own limited company and HMRC accepts you're genuinely self-employed. Your tax efficiency is higher — you pay corporation tax on profits and take the rest as salary and dividends.

How lenders see it: Lenders assess your salary + dividends (your share of net profit). Many specialist lenders will also consider your contract rate × contracted days, giving you a higher lending multiple.

Documents needed:

• SA302 and tax year overviews (2–3 years)
• Accountant-prepared accounts
• Current contract
• Business bank statements

How the IR35 Offset Calculation Works

Some lenders apply an IR35 "deemed salary" calculation. If your contract is £500/day outside IR35, they might apply a notional 33% tax deduction and assess you on £335/day. This protects them if your status changes.

Lenders that DON'T apply IR35 adjustments:

• Halifax (with 12+ months history)
• Accord Mortgages
• Nationwide
• Coventry Building Society

What to Do If Your Contracts Mix Inside and Outside IR35

Many contractors have a mix. The best approach is:

1. Work with a broker who understands dual-income assessment
2. Separate your income — HMRC documents for outside IR35, payslips for inside IR35
3. Consider a lender that assesses each income stream on its own merits
4. Prepare for questions about contract continuity and future IR35 status

Key Documents Checklist

• SA302 and tax year overview (last 2–3 years)
• Current contract showing IR35 determination
• Company accounts (if limited company)
• Business bank statements (6–12 months)
• Personal bank statements (3–6 months)
• Dividend vouchers (if applicable)
• Umbrella company contract (if inside IR35)
• Latest payslips (if inside IR35)

Summary

IR35 doesn't stop you getting a mortgage — but it changes which lender will say yes. Inside IR35, you're assessed like an employee. Outside IR35, your contract rate drives the calculation. A broker who understands the contractor mortgage market is essential.

This guide is for informational purposes only and does not constitute financial advice. IR35 status should be determined by a qualified tax professional.