How to Choose a Construction Accountant: 12 Questions UK Construction Businesses Should Ask

Choosing an accountant for a construction business is not quite the same as choosing an accountant for a typical small company.

Construction businesses can have CIS deductions going in both directions, subcontractor verification, Domestic Reverse Charge VAT, payroll, materials, retention payments, multiple live projects and margins that can change quickly when labour or material costs move.

A general accountant may be perfectly capable of preparing annual accounts. The more important question is whether they understand how a construction business operates throughout the year.

If you are trying to work out how to choose a construction accountant, these 12 questions will help you compare firms properly before handing over your bookkeeping, tax and financial records.

What should you look for in a construction accountant?

Look for an accountant who regularly works with construction businesses and can deal confidently with CIS, Domestic Reverse Charge VAT, subcontractors, payroll, construction bookkeeping and project-level cost reporting.

Do not choose solely on the lowest monthly fee. Ask exactly what is included, how often your accounts will be reviewed, what reporting you will receive and whether the accountant can continue supporting you as your business grows.

Why choosing the right construction accountant matters

Construction accounting becomes complicated because several accounting processes can affect the same transaction.

A subcontractor invoice, for example, may involve:

• CIS verification and deductions
• labour and material costs
• VAT or Domestic Reverse Charge VAT
• allocation to the correct construction project
• payment records
• monthly CIS reporting
• cash-flow forecasting

If these processes are handled separately, mistakes can become difficult to identify.

The right construction accountants should understand how these pieces connect rather than looking at each tax or bookkeeping issue in isolation.

Here are the questions worth asking before appointing one.

1. Do you regularly work with construction businesses?

Start with the most basic question.

Ask how many construction businesses the accountant already works with and what types of businesses they support.

There can be a significant difference between accounting for a local builder, a subcontractor working for several principal contractors, a growing construction limited company and a property developer running several projects.

You want evidence that the accountant understands the commercial realities of construction, not simply that CIS appears somewhere on their website.

Ask whether they regularly work with:

• builders
• contractors
• subcontractors
• trades
• construction limited companies
• property developers

A construction-focused accountant should already understand the terminology and common accounting problems you are describing.

For example, if you run a building company, ask about their experience working with accountants for builders. If most of your income comes from contracting for other firms, experience with accountants for subcontractors may be more relevant.

What you want to hear: specific examples of the types of construction businesses they support and the accounting processes they manage for them.

2. Can you manage both sides of CIS?

This question quickly separates basic CIS knowledge from practical construction accounting experience.

A construction business can be a contractor, a subcontractor or sometimes both.

If you pay subcontractors, your accountant may need to help with:

• CIS registration
• verifying subcontractors
• applying the correct deduction rate
• calculating deductions
• monthly CIS returns
• payment and deduction statements
• reconciling CIS records with bookkeeping

At the same time, your own customers may be deducting CIS from payments made to your company.

Your accountant therefore needs to understand CIS deducted from subcontractors you pay and CIS suffered on income you receive.

If they only discuss filing the monthly contractor return, ask what happens to CIS deductions made from your company’s own invoices.

Good construction accounting should follow the entire CIS position.

You can read more about how CIS returns work and how they fit into ongoing construction accounting.

What you want to hear: a clear explanation of how they handle CIS as both contractor and subcontractor where relevant.

3. Do you understand CIS materials and deductions?

CIS is not simply a case of deducting 20% from every invoice.

The calculation can depend on how the invoice is structured and whether qualifying material costs have been incurred directly by the subcontractor.

This matters because incorrect treatment of materials can lead to too much or too little CIS being deducted.

Ask the accountant how they would review an invoice containing:

• labour
• materials
• VAT
• plant hire
• other project expenses

They should be able to explain which parts may need to be excluded before the CIS deduction is calculated and why evidence supporting material costs matters.

An accountant who regularly handles construction clients should also be comfortable identifying situations where material figures look inconsistent or have been recorded incorrectly.

Our guide to CIS deductions explains the deduction rates, materials treatment and payment statements in more detail.

What you want to hear: more than “CIS is normally 20%”. They should understand how the deduction itself is calculated.

4. Can you handle Domestic Reverse Charge VAT?

VAT is another area where construction businesses need sector-specific knowledge.

The Domestic Reverse Charge can apply to certain building and construction services where the required conditions are met.

Instead of simply charging and collecting VAT in the normal way, the customer accounts for the VAT under the reverse charge.

Whether the reverse charge applies can depend on factors including:

• whether both businesses are VAT registered
• whether the supply falls within relevant construction services
• whether the transaction falls within CIS
• whether the customer is an end user
• the nature of the supply

Ask your prospective accountant what process they use for determining the VAT treatment of construction invoices.

They should also understand how VAT interacts with your accounting software and bookkeeping rather than waiting until the VAT return is due to investigate transactions.

What you want to hear: a practical process for reviewing invoices and VAT treatment, not simply confirmation that they have heard of the reverse charge.

5. How do you manage construction bookkeeping?

Good construction bookkeeping should tell you more than your bank balance.

A construction business may have labour, materials, subcontractors, equipment, professional fees and other costs spread across several projects at the same time.

If everything is entered into broad accounting categories without proper structure, your year-end accounts might still be completed, but you may have very little idea which projects actually made money.

Ask how the accountant would structure your bookkeeping.

Questions worth asking include:

• How frequently are transactions reconciled?
• How are subcontractor payments recorded?
• How are material costs categorised?
• Can expenses be allocated to individual projects?
• How are CIS records reconciled against the accounts?
• How are VAT transactions checked?
• Who is responsible for collecting missing invoices and receipts?

Our construction bookkeeping service is designed around the financial workflow of construction businesses rather than treating bookkeeping purely as data entry.

What you want to hear: bookkeeping processes that support project visibility and tax compliance throughout the year.

6. Can you track costs by project?

This may be one of the most valuable questions on the list.

Knowing that your construction company made a profit last year is useful.

Knowing which projects produced that profit is much more useful.

If you are running several jobs simultaneously, ask whether your accountant can help organise costs by project.

Depending on your business, this could include:

• labour
• subcontractors
• materials
• equipment
• plant hire
• professional fees
• overhead allocations
• invoiced income
• project margins

Suppose Project A generates £200,000 of revenue and Project B generates £150,000.

Revenue alone does not tell you which project performed better.

If Project A required significantly more subcontractor labour, materials and remedial work, its actual margin could be lower.

Project-level records help management see this before the year-end accounts arrive.

What you want to hear: a clear explanation of how project income and expenditure can be tracked and reported.

7. How do you deal with subcontractors?

Subcontractors create several accounting responsibilities.

Before paying a subcontractor, a contractor may need to verify their status and apply the CIS deduction rate provided by HMRC.

Records then need to remain consistent across:

• invoices
• verification details
• payment records
• CIS deductions
• deduction statements
• monthly CIS returns
• bookkeeping

Ask who handles each step.

If your business processes a large number of subcontractor invoices, also ask how the accountant will identify inconsistencies.

For example, what happens if:

• a subcontractor’s details do not match?
• the wrong CIS rate has been applied?
• materials appear unusually high?
• a payment statement is missing?
• a subcontractor’s payment status changes?

A good system should prevent small administrative problems becoming larger accounting problems.

What you want to hear: a repeatable subcontractor process rather than corrections being made months later.

8. Can you handle payroll alongside CIS?

Construction businesses often have a mixture of employees and subcontractors.

Those are not the same thing from an accounting or tax perspective.

If your company employs site staff, office staff, managers or other workers, payroll may need to operate alongside CIS.

Ask whether the accounting firm can handle:

• PAYE payroll
• employee records
• payslips
• RTI submissions
• employer liabilities
• workplace pension requirements
• CIS contractor deductions
• CIS suffered by the company

It is usually easier when these processes are properly coordinated.

You should also be wary of anyone suggesting that a worker should simply be treated as a subcontractor because it is administratively easier.

Employment status depends on the actual working arrangement.

What you want to hear: clear separation between payroll responsibilities and CIS, with both processes reconciled into the wider accounts.

9. Which accounting software do you support?

Software matters, but choosing construction accounting software should start with the business rather than the brand name.

Your accountant may support platforms such as:

• Xero
• QuickBooks
• Sage
• FreeAgent

The more important question is how the software will be configured.

Ask whether it can support:

• CIS
• VAT
• bank feeds
• receipt capture
• project or job tracking
• payroll integrations
• management reporting
• subcontractor records

A small subcontractor and a construction company managing several multi-stage projects may not need the same setup.

That is why the “best” software is usually the software that fits the company’s actual accounting workflow.

See our construction accounting software comparison for a detailed comparison of Xero, QuickBooks, Sage and FreeAgent for UK construction businesses.

What you want to hear: a recommendation based on how your business operates rather than a software package being recommended simply because the accountant uses it for everyone.

10. What management reporting will you receive?

Do not assume that hiring an accountant automatically means you will receive useful management information.

Ask exactly what reports are included.

Basic accounts may show:

• turnover
• overall expenses
• profit
• balance sheet figures

A growing construction company may need more.

Useful management reporting might include:

• profit and loss
• cash-flow position
• aged debtors
• aged creditors
• project performance
• labour or subcontractor costs
• gross margins
• tax liabilities
• VAT position

More importantly, ask how often these reports will be produced and whether someone will explain what they mean.

A detailed report delivered six months after a problem developed may not help you manage the project that caused it.

What you want to hear: regular reporting appropriate to your company’s size, accompanied by meaningful discussion where required.

11. What’s included in the fee?

Price matters, but comparing accountants purely by headline monthly fee can be misleading.

One quote might include bookkeeping, payroll, CIS and VAT.

Another might cover only annual accounts and corporation tax.

Before comparing prices, ask each accountant to confirm exactly what is included.

Check for:

• bookkeeping
• VAT returns
• CIS monthly returns
• payroll
• annual accounts
• corporation tax returns
• Self Assessment where required
• Companies House filings
• management accounts
• software fees
• tax planning meetings
• HMRC correspondence
• ad-hoc advice

Also ask what is not included.

Will additional calls be charged separately?

Is correcting historical bookkeeping additional work?

Are software subscriptions included?

Does the quoted amount include VAT?

A slightly higher but predictable fee may be more useful than a low monthly price followed by regular additional charges.

What you want to hear: a transparent written scope explaining the work, frequency and additional charges.

12. What happens when your construction company grows?

The accountant you need when turning over £150,000 may not be the accountant you need when managing several million pounds of projects.

Ask how their service changes as your company grows.

Growth can introduce requirements such as:

• more subcontractors
• larger payrolls
• VAT complexity
• more detailed project reporting
• multiple companies
• property development SPVs
• cash-flow forecasting
• management accounts
• budgeting
• tax planning
• finance-team support

You should not necessarily have to change accountants every time the company reaches another stage.

For property businesses in particular, development structures and project-level records can become increasingly important. See our guide to property developer accountants for more detail.

What you want to hear: a clear path from compliance accounting towards stronger reporting and financial management as the company becomes more complex.

Red flags when choosing a construction accountant

Knowing what to avoid can make choosing an accountant easier.

They have very little practical CIS experience

A general understanding of CIS is not enough if your company regularly verifies and pays subcontractors.

Ask practical questions and see how confidently they answer them.

Everything is reviewed at year end

Annual accounts are important, but construction accounting problems often develop during projects.

If invoices, CIS, VAT and bookkeeping are only seriously reviewed months later, important errors can remain unnoticed.

There is no project-cost visibility

If the accounting system cannot show which jobs are generating margin and which are absorbing cash, you may have good statutory records but poor management information.

Responsibility for CIS returns is unclear

You should know whether you, your bookkeeper or the accountant is responsible for:

• subcontractor verification
• deduction calculations
• CIS returns
• payment and deduction statements
• fixing discrepancies

Ambiguity creates missed tasks.

VAT is treated separately from the construction workflow

VAT, CIS, invoices and bookkeeping often interact.

An accountant should understand the transaction as a whole rather than treating the VAT return as an isolated quarterly exercise.

Fees are difficult to understand

If you cannot establish what is included before becoming a client, unexpected costs are likely to be frustrating later.

Ask for a clear scope.

Construction accountant comparison checklist

Use this table when speaking to accountants.

Do not simply tick a box because the firm’s website mentions a service. Ask how they actually deliver it.

Check	Accountant A	Accountant B	Accountant C
Regular construction clients	☐	☐	☐
CIS contractor returns	☐	☐	☐
CIS suffered	☐	☐	☐
CIS materials knowledge	☐	☐	☐
Domestic Reverse Charge VAT	☐	☐	☐
Construction bookkeeping	☐	☐	☐
Project/job cost tracking	☐	☐	☐
Subcontractor processes	☐	☐	☐
Payroll	☐	☐	☐
Construction software support	☐	☐	☐
Project/management reporting	☐	☐	☐
Regular account reviews	☐	☐	☐
Fixed/clear fees	☐	☐	☐
Support as the business grows	☐	☐	☐

What is the best construction accountant for your business?

There is no single best construction accountant in the UK for every construction company.

The right choice depends on what your business actually needs.

A sole-trader subcontractor may primarily need CIS records, tax returns, expenses and help understanding deductions.

A growing building company might need bookkeeping, subcontractor management, CIS returns, payroll, VAT and project-level reporting.

A property developer could need accounting across several projects or entities while keeping project expenditure, funding and VAT properly organised.

That is why the best question is not simply:

“How much do you charge?”

It is:

“How will you manage the accounting processes that happen inside my construction business?”

The answer tells you far more about the service you are likely to receive.

Already comparing construction accountants?

Path Accountants supports builders, contractors, subcontractors and property developers with CIS, VAT, construction bookkeeping, payroll, company accounts and project-level financial records.

Instead of forcing every construction business into the same accounting package, the starting point should be understanding how your company actually operates.

Tell us:

• whether you operate as a contractor, subcontractor or both
• how many subcontractors you regularly pay
• whether you employ staff
• whether you are VAT registered
• how your bookkeeping currently works
• whether you need project-level reporting
• where the biggest accounting problems are occurring

We can then help identify the accounting support your construction business actually needs.

Discuss Your Construction Accounts

FAQs How to choose a construction accountant

How do I find a good construction accountant?

Start by looking for accountants who already work with construction businesses rather than choosing purely by location or price.

During the initial conversation, ask specific questions about CIS, Domestic Reverse Charge VAT, subcontractors, construction bookkeeping, payroll and project reporting.

An accountant with genuine construction experience should be able to explain how these processes would work in your business.

Does a construction accountant need to understand CIS?

If your business operates within CIS, yes.

The accountant should understand contractor and subcontractor responsibilities, verification, deductions, materials, monthly returns, deduction statements and CIS suffered where relevant.

Should my construction accountant provide project reporting?

Not every small construction business needs detailed monthly project accounts, but growing businesses should consider whether project-level financial information would improve decision-making.

Knowing total annual profit is different from knowing which contracts are profitable.

Should I choose the cheapest construction accountant?

Not automatically.

Compare what is included in each quote first.

A low-cost service covering annual accounts only cannot be directly compared with a service that includes bookkeeping, VAT, payroll, CIS and regular management reporting.

The better comparison is the scope and quality of support for the fee, rather than the headline monthly price alone.