Being paid under the Construction Industry Scheme should not mean settling for a smaller home, a larger deposit or a lender that misunderstands your income. This CIS mortgage review explains what actually matters to lenders, where applications can go wrong and how the right specialist approach can put your full earning position to work.
For many CIS subcontractors, the frustration starts with a simple question: “Are you employed or self-employed?” The reality is often less tidy. You may work continuously for one contractor, receive weekly or monthly payslips, have tax deducted at source and still be treated as self-employed for mortgage purposes. A lender using a one-size-fits-all process can see that as a problem. A lender that understands CIS income can see a reliable borrower with a strong track record.
What is a CIS mortgage?
A CIS mortgage is not a separate mortgage product with a special rate. It is a mortgage assessed by a lender willing to use your CIS payslips and payment history to calculate affordability in a way that reflects how you work.
Instead of insisting on two or three years of full accounts and tax calculations, some lenders can assess eligible CIS applicants using recent payslips, often annualising gross income before CIS deductions. That distinction can be significant. Your net payment may look lower because tax has already been withheld, but it does not necessarily reflect what you earn or what you can reasonably afford.
Criteria vary widely. One lender may want three months of payslips, another may require six or 12 months, and some will look closely at gaps between contracts or changes in trade. This is why applying to the first high street bank that appears on a comparison table can be an expensive use of time.
The real benefit: lending based on your earning power
A strong CIS application is about more than proving you receive payments. It is about presenting your work history, contract pattern and income in the format a suitable lender expects.
If you are a bricklayer, electrician, carpenter, groundworker, site manager or other construction professional paid under CIS, your gross income can be materially higher than the figure an inexperienced lender uses. When affordability is assessed on the wrong basis, the result may be a reduced borrowing figure or an avoidable decline.
A specialist lender may be able to use gross CIS income, subject to its individual policy and your wider circumstances. That can improve borrowing capacity without asking you to change your trading structure, take a larger salary or abandon sensible tax planning. It does not guarantee a particular loan amount, of course. Your deposit, credit profile, committed spending, dependants and the property itself still matter. But it makes sure the starting point is fair.
CIS mortgage review: what lenders will check
Lenders do not assess every CIS worker in the same way, but their questions tend to fall into familiar areas. Knowing these in advance helps avoid surprises once an offer has been accepted.
Your CIS income history
Recent payslips are usually central to the application. A lender may calculate an average from the latest three, six or 12 months, particularly where income varies with overtime, site work or changing day rates. Consistency is useful, but a modest fluctuation does not automatically rule you out.
The key issue is whether your payments show a sustainable level of earnings. If you have just moved to a higher-paying contract, some lenders will accept it with supporting evidence, while others will prefer a longer record at that level.
Gaps between jobs and contracts
Construction work does not always run in a perfect straight line. A short gap between sites is common and should be explained, not hidden. Lenders may be comfortable where there is a clear history of continuous work in the same trade and the break was brief or planned.
Longer gaps need more careful handling. They could be due to illness, a holiday, training, a move into a new specialism or a quieter period in the sector. The right explanation, backed by bank statements and evidence of the next contract where available, can make a meaningful difference.
Tax position and paperwork
CIS deductions are often misunderstood. A lender will want to see that the figures on your payslips correspond with payments into your bank account and that your tax affairs are up to date. If you submit self-assessment tax returns, these may still be requested even where the lender is using CIS payslips for affordability.
Do not assume that an accountant’s reference alone will be enough. Clear, matching documentation is normally stronger than a complicated explanation after the application has been submitted.
Deposit, credit and monthly commitments
CIS status does not override normal mortgage underwriting. The deposit size affects the loan-to-value and choice of rates. Credit commitments, including car finance, personal loans, credit cards and childcare costs, affect affordability. Recent missed payments, defaults or county court judgments can narrow lender choice, although they do not always make a mortgage impossible.
Honesty at the outset matters. A broker can plan around a historic credit issue. It is much harder to rescue a case when it appears unexpectedly during a lender’s checks.
Documents worth preparing before you apply
A well-packaged application reduces back-and-forth and gives an underwriter confidence in the numbers. Before seeking a Decision in Principle, it is sensible to have your latest CIS payslips and corresponding bank statements ready, along with proof of deposit and identification.
You may also need evidence of your current or upcoming contract, self-assessment documents where relevant, and details of existing borrowing. If you have used more than one payroll provider or worked for several contractors, keep the timeline clear. The aim is not to produce every document you own. It is to make your income story easy to verify.
When a CIS mortgage may not be the best route
CIS underwriting is valuable, but it is not automatically the best choice for every construction worker. If your declared taxable income is consistently strong and you have several years of accounts, a mainstream self-employed route may offer equally competitive options. If you operate through a limited company, a contractor mortgage based on salary, dividends, retained profit or day rate may be more appropriate than a CIS-led assessment.
Equally, if you are newly registered under CIS with only a few weeks of income, your options may be more limited until a longer record is available. Some lenders can be flexible, but there is no benefit in forcing an application before the evidence supports it. A short wait can sometimes create a stronger case and a wider choice of products.
Why lender choice matters more than a headline rate
The lowest advertised rate is not always the right mortgage if the lender cannot assess your income correctly. A rate that looks attractive on paper is irrelevant if its underwriting reduces your loan amount below what you need, or if the application stalls while the lender asks for documents it was never likely to accept.
The better question is: which lender will understand my income, lend the amount I need and offer a competitive overall deal? That includes the interest rate, fees, product incentives, overpayment terms and how long the lender is likely to take to reach a decision.
For a purchase, speed can protect a property you want. For a remortgage, the right timing can prevent you moving on to a lender’s standard variable rate. Residential Mortgage Hub works across a broad lender panel to identify lenders whose criteria match contractor and CIS income, rather than trying to reshape your application to fit a narrow policy.
A practical way to approach your application
Start with a realistic view of your gross CIS income, your deposit and your monthly commitments. From there, establish which lending approach is likely to produce the strongest borrowing figure. This should happen before you make a full application and certainly before you rely on an online calculator designed for conventional salaried employment.
Next, check your paperwork for consistency. Payslips, bank credits and the income entered on the application should align. If there is a gap, a change in contractor or a one-off reduction in earnings, explain it early with evidence. Underwriters are used to real working lives. They are less comfortable with unexplained discrepancies.
Finally, do not confuse a soft indication with a lender-backed assessment. A properly sourced Decision in Principle gives you a clearer sense of what is achievable, although the final offer will still depend on full underwriting, valuation and satisfactory documentation.
Your CIS status is a payment and tax arrangement, not a measure of how mortgageable you are. With the right lender and a case built around your actual earnings, it can be the evidence that helps you move forward with confidence.
