A CIS mortgage is usually a normal UK mortgage where the lender assesses income paid under the Construction Industry Scheme. It is not normally a separate mortgage product, but the way your income is evidenced can make a big difference.
For many construction workers, the challenge is that you may be treated as self-employed for tax and work purposes, while your pay looks regular because deductions are made before you receive it. Some lenders understand this well. Others may assess you using self-employed accounts or taxable profit, which can reduce the income they are willing to use.
Plain English: for CIS mortgages, the job title matters less than the evidence. A lender wants to see what you earn, how long you have earned it, whether it is likely to continue, and whether the rest of the application is affordable.
This guide explains how CIS mortgage assessment usually works, what documents to prepare, where applications often go wrong, and when a specialist mortgage broker may help.
Key takeaway: A CIS mortgage is usually a normal UK mortgage where the lender assesses income paid under the Construction Industry Scheme.
What a CIS mortgage route means in practice
A CIS mortgage route means a lender is considering income paid under the Construction Industry Scheme as part of a mortgage application.
GOV.UK explains that the Construction Industry Scheme applies to contractors and subcontractors in construction, with deductions taken from payments to subcontractors and passed to HMRC. That is the tax framework. Mortgage lenders then decide how they will assess that income for affordability.
In practice:
- a CIS mortgage is usually a standard mortgage assessed using CIS income evidence
- some lenders may use CIS payslips or deduction statements to assess income
- some lenders may instead treat you as self-employed and use tax calculations, tax year overviews or accounts
- lenders can take different views on the same borrower
- deposit, credit history, outgoings, property type and income stability still matter
- an agreement in principle is not the same as a full mortgage offer
Do not assume that one lender’s decline means every lender will say no. CIS cases are often about lender fit and evidence, not just income level.
This information is general guidance only and is not personalised mortgage advice. Your options depend on your circumstances and lender criteria at the time you apply.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
Can CIS workers get a mortgage?
Yes, CIS workers can apply for mortgages, but the outcome depends on whether the lender is comfortable with the income and the wider application.
A lender may want to understand:
- how long you have worked in construction
- how long you have been paid under CIS
- whether you work for one contractor or several
- whether your payments are regular or seasonal
- whether bank statements match your CIS payslips or deduction statements
- whether tax documents support the income being declared
- whether work is likely to continue
- whether the mortgage is affordable after debts, bills and household costs
A construction worker with regular CIS income, clean bank statements and a sensible deposit may have more straightforward options than someone who has recently changed trade, has large gaps in work, or has credit issues. But there is no single rule that fits every CIS borrower.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
Gross CIS income, net pay and taxable profit: what might lenders use?
This is one of the most important points for CIS mortgages.
Some CIS workers earn strong gross income, but their tax return or accounts may show a lower taxable profit after expenses. Depending on the lender, this can affect how much income is used in the affordability calculation.
| Income figure | What it means | Why it matters for a mortgage |
|---|---|---|
| Gross CIS income | Pay before CIS tax deductions and expenses | Some lenders may consider this where CIS income is evidenced clearly, subject to criteria. |
| Net pay received | What lands in your bank after CIS deductions | Useful for matching payslips or statements to bank credits, but not always the figure used for affordability. |
| Taxable profit | Income after allowable business expenses on tax documents | Some lenders assess self-employed applicants using this figure, which may be lower than gross CIS income. |
| Recent average income | Average over recent weeks or months | May help show current earnings, but lenders may question whether a short-term increase is sustainable. |
| Annual income history | Income over one or more tax years | Often useful where income varies, work is seasonal or several contractors are involved. |
This is why choosing the right lender route matters. A lender that insists on taxable profit may reach a different affordability result from a lender willing to assess CIS income using payslips or deduction statements.
A broker cannot change the facts, but they can help identify which lenders are more likely to assess the evidence in a suitable way.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
A common trap: strong CIS pay, but the wrong income figure
Imagine a bricklayer paid under CIS who has been earning well for the last eight months after moving onto a busy site. Their recent CIS statements show a strong weekly gross figure, so they annualise that income and start viewing properties based on that number.
The problem is that the last completed tax year tells a different story. Earlier in the year there were gaps between contracts, and the tax return shows a much lower taxable profit after tools, van costs, insurance and other expenses. The bank statements also show some weeks with no income and a few lump-sum credits that are not clearly labelled as CIS payments.
This is where CIS mortgage applications can go wrong. One lender might focus on the taxable profit and take a cautious view. Another may be more comfortable looking at recent CIS statements, but only if the income is consistent, clearly paid into the bank account, and supported by evidence that the work is ongoing.
Before making offers on properties, this borrower would be better off checking:
- whether the lender is likely to use gross CIS income, recent average income or taxable profit
- whether the CIS statements match the bank credits cleanly
- whether any gaps between jobs need explaining
- whether the latest higher income looks sustainable, not just temporary
- whether the requested mortgage still fits if a lender uses a lower income figure
The practical lesson is simple: with CIS income, affordability can change dramatically depending on which evidence the lender relies on. A high current weekly income is useful, but it needs to be presented in a way that matches the lender’s criteria.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
Who may need a CIS mortgage route?
A CIS mortgage route may be relevant if you are:
- a subcontractor paid through the Construction Industry Scheme
- a construction worker paid by one main contractor
- a subcontractor working across several sites or contractors
- a first-time buyer with CIS income
- a homeowner looking to remortgage
- a home mover whose income is mainly CIS-based
- a borrower with a mix of CIS, PAYE, overtime, day-rate or self-employed income
- a sole trader in the construction industry
- a limited company director who also receives construction-related income
- a borrower whose payslips do not look like standard PAYE payslips
It may also be relevant if you have been told you are “self-employed” for mortgage purposes even though tax is deducted before you are paid.
That distinction matters because it can affect the documents required, the income calculation and sometimes the lenders available.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
When CIS income can make a mortgage harder
CIS income does not automatically make a mortgage difficult, but it can create extra checks.
It may be harder where:
- you have only recently moved from PAYE to CIS
- you have less than 12 months of CIS history
- your income has risen sharply and the higher level is recent
- your income has fallen compared with previous years
- you work for several contractors and payments are irregular
- there are unexplained gaps between jobs
- tax documents show a much lower figure than recent CIS pay
- bank statements do not match the income being declared
- you have missed payments, defaults or other credit issues
- the property itself is unusual or harder to mortgage
You may not need a broker if your income is simple, your deposit is strong, your credit file is clean and your bank already understands how to assess CIS income. But if anything is unusual, it is usually better to check lender fit before applying.
A mortgage application can leave a footprint on your credit file. Applying to a lender that does not fit your circumstances can waste time and create avoidable stress, especially if you are already under pressure to meet a property deadline.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
What lenders usually check
CIS mortgage applications are assessed on the whole case, not income alone.
A lender may check:
- identity and address history
- deposit amount and source of funds
- CIS payslips or deduction statements
- bank statements showing income received
- SA302s or tax calculations
- tax year overviews
- accounts, where relevant
- contract or evidence of ongoing work
- credit commitments and regular outgoings
- dependants and household costs
- mortgage term and requested loan amount
- property type, condition and tenure
GOV.UK’s home-buying guidance notes that buyers should consider the costs of buying and owning a home, including mortgage payments and related costs. public guidance also encourages borrowers to consider affordability, deposit, fees and regular repayments before committing.
Mortgage lenders must also follow affordability rules. FCA-regulated mortgage firms are expected to assess whether borrowing is affordable and suitable within the rules that apply to the transaction.
That means a lender is not just asking, “Did you earn enough last month?” It is asking whether the borrowing appears sustainable after commitments, living costs, possible rate changes and the property risk.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
CIS mortgage document checklist
The cleaner your evidence, the easier it is for a broker or lender to understand the case.
You may not need every document below, but this is a sensible starting point.
| Document | Why it helps | Practical tip |
|---|---|---|
| Recent CIS payslips or deduction statements | Shows income paid and deductions made | Gather the latest three to six months if available. |
| Bank statements | Confirms income reaches your account | Check they match the payslips and explain unusual credits or outgoings. |
| SA302s or tax calculations | Shows declared income to HMRC | Useful where a lender treats the case as self-employed. |
| Tax year overviews | Confirms tax position for each year | Download from HMRC if required. |
| Accounts | Relevant for sole traders or limited company directors | Make sure the latest accounts are finalised where possible. |
| Contract or contractor letter | Helps evidence ongoing work | Useful where income is recent or has increased. |
| Proof of deposit | Lenders must verify source of funds | Include savings statements or gifted deposit evidence if relevant. |
| Credit file details | Helps identify issues early | Check all addresses and accounts are accurate. |
| Property details | Lender must assess the security | Lease length, construction type and condition can matter. |
If documents tell different stories, deal with that before applying. For example, if bank statements show lower income than the CIS statements, or tax documents show a much lower figure than recent earnings, a lender may ask questions.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
Scenario matrix: what your CIS situation may mean
| Situation | Why it matters | What to do before applying |
|---|---|---|
| Long-term CIS worker with regular payments | Clear income history may make the case easier to evidence | Gather CIS statements, bank statements and tax documents. |
| New to CIS after PAYE construction work | Some lenders may want a longer CIS track record | Evidence previous employment in the same trade and current work pattern. |
| Multiple contractors | Income may be strong but harder to average | Prepare a clear timeline of contractors, payments and gaps. |
| Recent income increase | Lender may question whether the new level is sustainable | Provide recent payslips, bank statements and evidence of ongoing work. |
| Falling income | Lender may use a lower or more cautious figure | Understand affordability before making offers on properties. |
| CIS plus PAYE or overtime | Mixed income can be assessed differently by lender | Break down each income type and gather evidence for each. |
| CIS income with credit issues | May reduce lender choice | Check dates, amounts, status and explanations before applying. |
| Unusual property | Income may be acceptable but property may not fit | Check construction type, tenure, lease length and valuation risks early. |
The main lesson is that the strongest route depends on the pattern of your income, not just the annual total.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
Common mistakes to avoid
Assuming all lenders assess CIS income the same way
They do not. One lender may use CIS evidence in a way that suits your case, while another may rely on tax returns or accounts. This can affect the amount they are prepared to lend and the documents they request.
Applying before checking the evidence
A strong income is not enough if the lender cannot verify it. Before applying, check that payslips, deduction statements, bank credits and tax documents are consistent or can be explained.
Relying only on recent higher earnings
If your income has increased in the last few months, some lenders may ask whether the increase is sustainable. They may compare recent income with previous tax years or ask for evidence of ongoing work.
Ignoring bank statement issues
Bank statements often show more than income. They may show overdraft use, returned payments, gambling transactions, debt repayments or undisclosed commitments. These do not always stop an application, but they can affect lender choice.
Changing income structure just before applying
Moving from PAYE to CIS, changing contractor, reducing hours or switching to a limited company shortly before applying can complicate the assessment. It may still be possible to get a mortgage, but timing and evidence become more important.
Assuming an agreement in principle is final approval
An agreement in principle can be useful, but it is not a mortgage offer. The lender still needs to review documents, complete underwriting, check credit, assess the property and issue a formal offer.
Forgetting the property risk
A lender may be comfortable with your CIS income but not the property. Short leases, unusual construction, certain flats, ex-local authority properties or properties needing major works can all narrow lender choice.
GOV.UK’s leasehold guidance is useful if you are buying a leasehold property and want to understand basic leasehold concepts before applying.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
Examples in practice
Example 1: CIS subcontractor with regular income
A first-time buyer has worked under CIS for two years with weekly payments from one main contractor. Their bank statements match their CIS deduction statements and their credit file is clean.
This may be a relatively clear CIS case because the income pattern is easy to evidence. A broker would still need to check the deposit, affordability, lender criteria and property details before recommending a route.
Example 2: CIS worker with rising income
A borrower has earned significantly more in the last six months than in previous years. They want a lender to use the recent higher figure.
Some lenders may consider recent CIS income, but the case may need more explanation. A lender may ask whether the higher income is likely to continue and whether the work pattern supports it.
Example 3: CIS worker with multiple contractors
A subcontractor works for several contractors during the year. Income is good overall, but some months are much higher than others.
This case may need careful packaging. The broker may need to show the wider pattern using CIS statements, bank statements and tax documents. Lender choice can be important because not every lender is comfortable with variable income.
Example 4: Recent move from PAYE to CIS
A construction worker was employed for several years and moved to CIS six months ago. The work is in the same trade and income has increased.
This can be more complex because the CIS history is short. Some lenders may want a longer track record, while others may consider the broader employment background. The outcome depends on criteria and the rest of the case.
Example 5: CIS income with credit issues
A borrower has strong CIS income but missed payments last year. They now have a larger deposit and stable work.
The credit issue does not automatically rule out a mortgage, but it may reduce lender choice. The date, amount, reason and current status of the missed payments all matter.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
What should CIS workers check before applying?
Before you apply, check the following:
- Are you definitely paid under CIS rather than PAYE?
- How many months of CIS evidence do you have?
- Do your bank statements match your CIS statements?
- Do your tax documents support the income position?
- Has your income recently increased or decreased?
- Do you work for one contractor or several?
- Are there gaps between contracts?
- What deposit do you have and where has it come from?
- Is your credit file accurate and up to date?
- Are there any property issues, such as lease length or construction type?
- What monthly payment would be comfortable, not just technically possible?
public guidance’s mortgage guidance is useful for understanding why shopping around and getting advice can matter, especially where your income is not straightforward.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
When to speak to a CIS mortgage broker
You may want to speak to a broker before applying if:
- you have less than two years of CIS history
- you have only a few months of CIS payslips
- your income has recently changed
- you changed contractor recently
- you work for several contractors
- your tax documents show lower income than your gross CIS pay
- you have mixed income, such as CIS plus PAYE, overtime, dividends or self-employed income
- your bank statements need explanation
- you have adverse credit
- you are buying an unusual property
- you need to move quickly after an offer is accepted
- you have already been declined by a lender
A broker’s role is not to make the facts look better than they are. It is to understand the facts, check current lender criteria and help avoid applications that are unlikely to fit.
James Blackler explains: “CIS cases often turn on the detail. The income may be there, but the lender still needs to be comfortable with how it is evidenced. We usually look at the income documents, bank statements, deposit, credit position and property before narrowing down lender options.”
If you are comparing options for a CIS worker mortgage, you can speak to a mortgage adviser or make a finance enquiry. We can help you work through the evidence and explain what may be realistic before you commit to an application.
Mortgage approval is never guaranteed, and this article does not provide personalised mortgage advice.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
What makes CIS mortgage advice different?
CIS advice is different because the main issue is often income interpretation.
With a straightforward PAYE employee, the lender may rely on payslips and an employer position. With a self-employed borrower, the lender may rely heavily on accounts and tax documents. CIS workers can sit between these two approaches.
A good CIS mortgage review should answer:
- will the lender treat you as CIS, self-employed or a contractor?
- which income figure is likely to be used?
- how many months or years of evidence are needed?
- does recent income look sustainable?
- do the bank statements support the application?
- does the property fit the likely lender route?
- what is the fallback if the first lender is not suitable?
The Bank of England’s Bank Rate can influence the wider interest-rate environment, but mortgage pricing also depends on lender funding, product type, loan-to-value, credit profile and market conditions. Do not rely on old rates or past borrowing examples when planning a new application.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
What could change the answer?
| Variable | Why it changes the route | What to check before applying |
|---|---|---|
| Lender criteria | Lenders assess CIS income differently | Whether the lender uses CIS payslips, tax documents or accounts. |
| Evidence period | Short history can reduce lender choice | How many months or years of income evidence are available. |
| Income trend | Rising or falling income may be treated cautiously | Whether the current income level is sustainable. |
| Deposit size | Loan-to-value affects risk and product choice | Source of funds and realistic purchase budget. |
| Credit history | Adverse credit can narrow options | Dates, balances, settlement status and explanations. |
| Property details | The property is the lender’s security | Tenure, lease length, condition and construction type. |
| Timing | Underwriting and valuation can take time | Whether your deadline allows for checks and possible fallback options. |
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
How to prepare before asking for advice
Before speaking to a broker, prepare a short summary of your situation.
Include:
- your trade and how long you have worked in it
- how long you have been paid under CIS
- whether you work for one contractor or several
- your recent average weekly or monthly income
- whether income has changed recently
- property price or estimated value
- deposit or equity available
- mortgage amount needed
- credit commitments and any known credit issues
- whether the property is freehold or leasehold, if known
- your timescale and any deadlines
Also gather the documents listed earlier in this guide where available. The aim is not to replace advice, but to make the first conversation more useful.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
What should you read next?
If your circumstances are more complex, these guides may also help:
- Specialist lending options
- Self-employed mortgages
- Mortgage for a company director
- New job mortgage
- Mortgage for company director on PAYE
- Mortgages for barristers
- Mortgages for NHS professionals
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for cis mortgages.
FAQs
What is a CIS mortgage?
A CIS mortgage is usually a standard mortgage where the lender assesses income paid under the Construction Industry Scheme. The main difference is how the lender verifies and calculates your income.
Can I get a mortgage with CIS payments?
You can apply for a mortgage with CIS income, but the lender must be satisfied with your income evidence, affordability, credit position, deposit and property. Different lenders assess CIS income in different ways.
Do CIS workers need two years of accounts?
Not always. Some lenders may ask for tax documents or accounts, while others may consider CIS payslips or deduction statements, subject to their criteria. A longer track record can help, but the required evidence depends on the lender and the case.
Will a lender use my gross CIS income?
Some lenders may consider gross CIS income where it is properly evidenced, but others may use taxable profit or self-employed income documents. This is one of the key reasons to check lender fit before applying.
Can I get a CIS mortgage with only three or six months of payslips?
Some borrowers with a short CIS history may have options, especially where they have previous experience in the same trade and strong supporting evidence. However, lender choice may be narrower and approval is not guaranteed.
Does bad credit stop a CIS mortgage?
Not always, but it can make the case harder. The type of credit issue, date, amount, reason and whether it has been resolved all matter. It may also affect the lenders and products available.
Can CIS income be used with PAYE income?
Potentially, yes. Mixed income can be considered, but lenders may assess each income type differently. You may need payslips, CIS statements, tax documents and bank statements depending on how the income is earned.
Is a CIS mortgage more expensive?
Not automatically. The cost depends on the lender, product, loan-to-value, credit profile, property and wider market conditions. Some complex cases may have fewer lender options, which can affect pricing, but this needs to be checked against current products.
Should I apply directly to my bank?
You can, but it may not be the best route if your income is complex. If your bank does not assess CIS income in a suitable way, you could lose time. A broker may help compare lenders that are more familiar with CIS income.
