Can I use accounting software for CIS submissions?

At Towerstone Accountants we provide specialist CIS accountancy services for contractors, subcontractors, and construction businesses across the UK. We created this webpage for people working in construction who want clear guidance on CIS, including registration, deductions, refunds, and common compliance tasks, without jargon. Our aim is to help you stay compliant with HMRC, avoid costly errors, and keep your records in good order.

This is a question I am asked regularly by contractors, limited company directors, and sole traders who are trying to simplify their admin without falling foul of HMRC rules. CIS is one of those areas that feels unnecessarily complex at first, with monthly deadlines, verification steps, deductions, and returns, so it is completely natural to look to accounting software and hope it can take the strain.

The short answer is yes, you can use accounting software for CIS submissions, and in many cases it is the most sensible way to manage CIS. However, it is not a case of switching software on and assuming everything will work perfectly on its own. CIS still requires understanding, correct setup, and ongoing checks, and software is only as good as the information you put into it.

In this article I want to explain clearly how accounting software can be used for CIS submissions, what it can and cannot do, which types of businesses benefit most, the common mistakes I see when people rely too heavily on software, and how to use it properly so that CIS becomes routine rather than stressful. This is written from practical experience of dealing with CIS through software on a daily basis, including fixing errors where systems were set up incorrectly from the start.

What CIS submissions actually involve

Before looking at software, it is important to be clear about what a CIS submission actually is, because many people assume it is just a simple monthly form.

If you are registered as a CIS contractor, your responsibilities usually include verifying subcontractors, calculating deductions, submitting a monthly CIS return to HMRC, and paying any deductions by the deadline. Even if you do not pay any subcontractors in a month, you are still required to submit a nil return unless the scheme is inactive.

Each monthly return confirms who you paid, how much was paid for labour, how much tax was deducted, and whether subcontractors were verified correctly. HMRC uses this information to cross check tax records, so accuracy matters.

Accounting software is designed to handle these steps in a structured way, but only if it is configured properly.

How accounting software supports CIS submissions

Most mainstream UK accounting software includes CIS functionality designed to link directly with HMRC systems. Once set up, the software can handle much of the routine work involved in CIS.

Typically, good CIS enabled software will allow you to:.

• Set up subcontractors with CIS status

• Verify subcontractors with HMRC

• Apply the correct CIS deduction rate automatically

• Separate labour and materials correctly

• Produce monthly CIS returns

• Submit CIS returns directly to HMRC

• Track CIS deductions paid and suffered

This integration can significantly reduce manual work and the risk of simple errors, particularly for businesses with multiple subcontractors.

Verification of subcontractors through software

One of the most useful features of CIS enabled accounting software is subcontractor verification.

When you take on a new subcontractor, you are required to verify them with HMRC before making payment. The verification confirms whether the subcontractor is registered and what deduction rate applies.

Accounting software allows you to submit this verification electronically and store the result within the system. This means the correct deduction rate is applied automatically when invoices or bills are entered.

Without software, verification often involves separate online checks, manual records, and greater scope for mistakes.

Automatic CIS deductions and calculations

Once subcontractors are set up and verified, accounting software can calculate CIS deductions automatically based on the labour element of each payment.

This is particularly helpful because CIS deductions must not be applied to materials or VAT. Separating these correctly is a common source of error when CIS is handled manually.

When software is configured correctly, it will calculate the deduction, record it in the accounts, and reflect it in the CIS return without the need for manual recalculation each month.

Submitting CIS returns directly to HMRC

Most modern accounting software allows you to submit CIS returns directly to HMRC from within the system.

This removes the need to log into separate HMRC portals and reduces duplication of work. It also creates a clear digital record of submissions, which is helpful if there is ever a query or dispute.

Direct submission also reduces the risk of missing deadlines, particularly when reminders and alerts are enabled.

Handling nil returns through software

A common misunderstanding is that if no subcontractors are paid in a month, nothing needs to be done. In reality, a nil CIS return is usually required unless HMRC has been told the scheme is inactive.

Accounting software makes this easier by prompting for a nil return and allowing it to be submitted quickly. This alone can save contractors from unnecessary penalties, which often arise simply because someone forgot to file.

Using accounting software as a subcontractor

Accounting software is also useful for subcontractors, not just contractors.

If you are a CIS registered subcontractor, software can help you record CIS deductions suffered, reconcile them against CIS statements, and ensure they are claimed correctly on your tax return.

This is particularly important for sole traders and limited companies, as missing CIS deductions can result in overpaying tax.

Good software will allow you to allocate CIS deductions to the correct tax account so they are not overlooked at year end.

The limits of accounting software for CIS

While accounting software is extremely helpful, it is important to understand its limits.

Software does not decide whether CIS applies in the first place. It does not assess employment status, decide whether someone is a bona fide subcontractor, or determine whether your business should be registered as a contractor.

These are judgement calls that require understanding of the rules. If CIS is applied incorrectly because the underlying setup is wrong, the software will not catch that.

In other words, software automates process, not responsibility.

Common mistakes when relying on software alone

Some of the most common CIS problems I see arise not because the software failed, but because it was set up incorrectly or misunderstood.

Common issues include:.

• Subcontractors set up as standard suppliers rather than CIS subcontractors

• Incorrect labour and materials split on invoices

• Applying CIS deductions to VAT incorrectly

• Failing to submit nil returns because no prompt was noticed

• Assuming verification carried over from a previous business

• Using the wrong tax treatment for limited company subcontractors

Once these errors are baked into the system, they can repeat every month until spotted, which is why oversight still matters.

The importance of correct initial setup

The initial setup of CIS within accounting software is the most important step.

This includes confirming that the business is registered as a CIS contractor with HMRC, entering the correct UTR and scheme details, enabling CIS settings in the software, and setting up subcontractors properly.

If this setup is rushed or handled by someone unfamiliar with CIS, problems often emerge months later when HMRC data does not match what has been submitted.

Spending time getting the setup right saves far more time later.

Accounting software and HMRC compliance

HMRC accepts CIS returns submitted through recognised accounting software, provided the software meets HMRC’s technical standards.

This means that from a compliance perspective, using software is perfectly acceptable and often encouraged. HMRC increasingly expects digital interaction, and software submissions fit well with that direction of travel.

However, HMRC still holds the contractor responsible for accuracy, regardless of whether returns were submitted manually or through software.

Interaction with PAYE and payroll software

Many accounting systems integrate CIS with payroll, which is useful for businesses that have both employees and subcontractors.

However, this can also create confusion if the two are not clearly separated. CIS does not replace PAYE, and workers should not move between payroll and CIS without careful consideration of employment status.

Software makes it easy to process both, but it also makes it easy to misclassify workers if care is not taken.

Accounting software and Making Tax Digital

Although CIS itself is not currently part of Making Tax Digital in the same way as VAT, the wider move towards digital record keeping makes software based CIS management increasingly sensible.

Using accounting software creates a consistent digital trail of payments, deductions, and submissions, which aligns with HMRC’s broader compliance approach.

Over time, this digital consistency is likely to become more important rather than less.

Is accounting software suitable for small contractors

Some small contractors assume that accounting software is only worthwhile for larger businesses with many subcontractors.

In reality, even contractors paying one or two subcontractors benefit from using software for CIS. The cost is often outweighed by reduced admin time, fewer mistakes, and less stress around deadlines.

Penalties for missed CIS returns apply regardless of business size, so software can be a form of risk management as much as convenience.

When software may not be enough on its own

There are situations where accounting software alone is not sufficient.

These include complex subcontracting chains, mixed contracts involving significant materials, changes in subcontractor status, and historic CIS issues that need correction.

In these cases, software should be used as a tool alongside professional advice rather than as a replacement for it.

I often see situations where software is working perfectly, but the underlying CIS treatment is wrong because the rules were misunderstood.

Using accounting software with an accountant

In my experience, the most effective setup is where accounting software is used day to day by the business, with oversight from an accountant who understands CIS.

This allows routine work to be handled efficiently while ensuring that setup, reviews, and unusual situations are dealt with properly.

CIS is an area where a small misunderstanding can snowball, so having that second layer of review is valuable.

Planning and routine with software based CIS

One of the biggest advantages of using accounting software for CIS is routine.

Once set up correctly, CIS becomes a monthly process rather than a monthly worry. Subcontractor payments are entered, deductions are calculated automatically, and returns are submitted on time.

This predictability is especially helpful for businesses juggling multiple projects and deadlines.

Final thoughts

So can you use accounting software for CIS submissions. Yes, absolutely, and for most contractors it is the most practical and efficient way to manage CIS.

However, software is not a magic solution. It relies on correct setup, accurate data, and a proper understanding of when CIS applies and how it should be treated.

Used properly, accounting software reduces errors, saves time, and provides a clear audit trail. Used carelessly, it can repeat the same mistake every month without anyone noticing.

From experience, the businesses that get the most value from CIS enabled software are those that treat it as part of a wider compliance process rather than a shortcut. When combined with understanding and oversight, it turns CIS from a headache into a manageable routine.

You may also find our guidance on How can an accountant help with CIS bookkeeping and check cis payments online helpful when dealing with related CIS questions. For a broader overview of CIS rules, compliance, and support, you can visit our cis guidance hub.