Contractor Mortgages: Day Rate, Umbrella & CIS Explained

If you contract through a limited company, an umbrella company or under CIS, you have probably been told you need years of accounts before any lender will take you seriously. That advice is out of date. A meaningful slice of the UK mortgage market assesses contractors on their annualised day rate — not on accounts, not on payslips — and that single difference in method can add six figures to your maximum loan.

This guide explains how the day-rate calculation works, what history and contract evidence lenders typically ask for, how umbrella, IR35 and CIS arrangements change the picture, and why comparing lenders is more important for contractors than for almost any other type of borrower.

How the day-rate method works

Lenders that specialise in contractor lending convert your current day rate into a notional annual salary using a simple formula:

Day rate × 5 days × 46 to 48 weeks (the number of weeks varies by lender — most use 46, some use 48).

The lender then runs its normal affordability assessment and income multiple against that annualised figure. The key point is what the calculation ignores: it does not care what your limited company retained as profit, what salary and dividends you actually drew, or what your accountant did to minimise your tax bill.

That matters because most contractors deliberately draw a modest salary plus dividends and leave the rest in the company. Assessed on accounts, that tax-efficient structure makes your income look small. Assessed on the day rate, the lender sees something much closer to your true earning power — and the difference in borrowing capacity can be enormous, as the example below shows.

Worked example: day rate vs accounts

Take an IT contractor on £400 per day who trades through a limited company and draws £55,000 a year in salary and dividends.

Nothing about the contractor changed between those two assessments. The only variable was the method the lender used. If your income structure looks anything like this, the single most valuable thing you can do is find the lenders that will use the day-rate route — before you fall in love with a property your current bank says you cannot afford. Our guide to self-employed mortgage affordability covers the accounts-based route in detail if you have been trading longer and retain significant profits.

What contractor-friendly lenders ask for

The day-rate route is not a loophole — lenders simply substitute contract evidence for accounts. The typical requirements are:

• 12 months of contracting history. Some lenders accept as little as 6 months if you are continuing in the same line of work — for example, an engineer who moved from permanent employment into contracting in the same field.
• A current contract with time left to run. Commonly 3 or more months remaining, or written evidence that the contract will be renewed.
• Limited gaps between contracts. Short breaks are expected; commonly up to around 6 weeks of gaps per year is tolerated before lenders start averaging your income down or asking questions.
• Day-1 new contracts are usually fine as long as you have contracting history behind you. A first-ever contract taken straight from permanent employment in the same field is accepted by some lenders too.

You will still need the usual identity documents, bank statements and deposit evidence, and the lender's credit checks apply in full. But you will not be asked for two or three years of finalised accounts the way a conventional self-employed applicant would be.

Umbrella companies and IR35

Since the off-payroll (IR35) reforms pushed many contractors into umbrella arrangements, a common worry is that working inside IR35 kills your borrowing power. It does not have to — but the lender you choose becomes even more important.

Umbrella workers are paid through a payslip, and that payslip shows your income afterthe umbrella's margin, employer's National Insurance and other deductions have come out of the contract rate. Lenders split into two camps:

• Gross contract rate lenders: some lenders look through the umbrella and work from the gross rate on your contract or assignment schedule — the same annualised day-rate maths as above.
• Payslip-only lenders: others will only use the figures on your umbrella payslips, which are materially lower than the contract rate.

The same umbrella contractor can therefore present two very different incomes depending on which camp the lender sits in. Before assuming your budget, find out which method each lender applies — the difference routinely runs to tens of thousands of pounds of borrowing.

CIS subcontractors in construction

Construction Industry Scheme (CIS) subcontractors get their own version of the same story. Treated as conventionally self-employed, a CIS worker is assessed on net profit after expenses — often a heavily reduced figure.

However, several lenders assess CIS subcontractors on gross CIS income, evidenced by CIS vouchers, statements or invoices covering the last 6 to 12 months, rather than on net self-employed accounts. Because gross CIS income is measured before expenses and deductions, the assessable figure is often dramatically higher — and because the 20% CIS deduction at source means many subcontractors receive tax refunds, the gross figure is usually a fairer reflection of real earnings anyway.

If you are a CIS subcontractor who has been told your accounts are "too low" to borrow what you need, the gross-CIS route is the first thing to check.

Fixed-term, agency and zero-hours workers

Contracting is not only an IT and engineering phenomenon. Lenders apply similar logic to other non-permanent work patterns:

• Fixed-term contract employees — NHS staff, teachers, IT and public sector workers on rolling fixed-term contracts — are treated much like day-rate contractors: lenders want a history in the role plus evidence the contract will renew or continue.
• Zero-hours and agency workers are usually assessed on a 12-month average of actual earnings, evidenced by payslips and P60s. Lenders vary in how they treat a rising or falling trend across the year.

If a large slice of your income comes from variable elements on top of a basic — shift enhancements, overtime, bonuses — the rules in our overtime, bonus and commission guide interact with everything above, because lenders also differ sharply on how much variable pay they will count.

Why lender choice matters so much

For a salaried employee, most mainstream lenders will land within 10-20% of each other on maximum borrowing. For a contractor, the spread is wildly bigger, because lenders disagree on the fundamental question of what your income is:

• Day rate annualised over 46 weeks, or 48?
• Gross contract rate, or umbrella payslip?
• Gross CIS vouchers, or net accounts?
• Latest year, or a two-year average?

Stack those choices together and the same contractor can see six-figure differences in maximum borrowing between the most and least generous lenders — as the £414,000 vs £247,500 example above shows. Asking one bank and accepting its answer is, for a contractor, leaving the biggest financial decision of your life to a coin flip.

Mortgage Affordability runs your details across 60+ UK lenders at once, using each lender's own affordability calculation, so you can see exactly which lenders treat your contracting income best before you apply.

Frequently asked questions

Do I need three years of accounts to get a contractor mortgage?

No. Many lenders assess contractors on their annualised day rate rather than company accounts or payslips. Typically you need around 12 months of contracting history (some lenders accept 6 months if you are continuing in the same line of work) and a current contract with time remaining or evidence of renewal — not years of accounts.

How do lenders calculate day rate income?

The common formula is day rate × 5 days × 46 to 48 weeks, depending on the lender. For example, £400 per day × 5 × 46 weeks gives £92,000 of assessable income. The lender then applies its normal income multiple and affordability checks to that figure.

Can I get a mortgage working inside IR35 or through an umbrella company?

Yes. Some lenders will work from your gross contract rate even when you are paid through an umbrella company, while others will only use the income shown on your umbrella payslips, which is usually lower. Choosing a lender that uses the gross rate can make a large difference to your maximum loan.

Does a gap between contracts matter?

Short gaps are normal and most lenders tolerate them — commonly up to around six weeks of gaps per year. Longer or frequent gaps may lead a lender to average your income down or ask for more history, so the lender you pick matters if your work pattern is stop-start.

Do lenders use gross or net CIS income?

It depends on the lender. Several lenders assess CIS subcontractors on gross CIS income evidenced by vouchers or invoices over the last 6 to 12 months, rather than net self-employed accounts. Because gross CIS income is before expenses and deductions, this route often produces a dramatically higher assessable income.

Last updated: June 2026