Making the most of VAT: A guide for growing businesses

VAT can feel like a box-ticking exercise, but it has a real impact on margins, pricing and cashflow as your business grows. This guide for growing businesses is for owners who are close to, or already over, the VAT-registration threshold and want to stay compliant without slowing down growth.

There are now around 2.73m VAT and PAYE-registered businesses in the UK, an increase of 0.4% in a year, which shows how many firms are already inside the VAT system (Office for National Statistics (ONS), 2025). Recent cost pressures, tighter lending and a tougher project pipeline mean construction, engineering and tech businesses cannot afford unexpected VAT bills or penalties.

The Autumn Budget 2025 did not alter VAT rates or the VAT registration threshold, so the current framework is expected to remain stable for 2025/26. That stability is useful, but it also means more growing businesses are steadily pulled into VAT as prices and turnover rise. Understanding how the rules work – and planning around them – is now a core part of responsible financial management.

In this article, we walk through thresholds, registration options, pricing decisions, digital record-keeping and common traps we see in project-based and tech-focused businesses, and how we can help you stay ahead of HMRC.

Why VAT matters as you scale

Once you are VAT-registered, VAT touches on the following.

• Pricing and margins: Every quote and rate card needs to factor in VAT.
• Cashflow: You become a tax collector for HMRC, holding VAT between invoices and returns.
• Systems and controls: Digital records and software compliant for Making Tax Digital (MTD) are no longer optional.
• Risk management: Errors can lead to assessments, interest and penalties.

For construction, engineering and tech-focused businesses, VAT is rarely straightforward. You may deal with complex contracts, staged payments, software licences, maintenance fees or subcontractor costs. Small errors can build up quickly over a few quarters.

If you are not sure whether your systems could handle VAT tomorrow, it is time to review your numbers, your software and your contracts before you hit the registration threshold. That is where working with a specialist adviser adds value.

VAT registration thresholds: A practical guide for growing businesses

The VAT registration threshold for 2025/26 is £90,000 of taxable turnover in a rolling 12-month period. That means you must monitor turnover month by month, not just at your year end. Research from the House of Commons Library confirms both the current threshold and the policy focus on pulling the right businesses into VAT without over-burdening the smallest firms (House of Commons Library, 2025).

There are three main positions to think about.

• Compulsory registration: You must register when your rolling 12-month taxable turnover first exceeds £90,000, or you expect to exceed it in the next 30 days. Missing this can lead to backdated VAT, interest and penalties.
• Voluntary registration: You can choose to register when you are below £90,000. This can work if most of your customers are VAT-registered and you incur significant input VAT on materials, subcontractors or software.
• Deregistration: You may apply to deregister if your taxable turnover falls below £88,000, although this is rare for growing businesses.

HMRC’s own guidance explains when you should register and how to apply online, and sets out the tests and deadlines in more detail (HMRC, 2025).

We recommend that growing businesses in construction, engineering and tech set an internal “amber zone” at around 75–80% of the threshold. Once you are consistently above that level, treat VAT registration as a matter of “when” not “if”, and start planning your pricing, systems and communication with clients.

If you want help reviewing your turnover projections and registration options, you can talk to us about VAT planning.

VAT, pricing and cashflow: Getting the basics right

For many SMEs, pricing is the most uncomfortable side of VAT. Here are a few key points to work through.

• Customer profile: If most customers are VAT-registered businesses, charging VAT should not affect their total cost, as they can usually reclaim it. If you work directly with consumers or micro-businesses, VAT can make your prices feel less competitive.
• Quoted vs headline prices: Decide whether to quote fees net of VAT or “VAT inclusive”. In B2B sectors, net pricing is more common. For consumer-facing work, inclusive pricing often feels clearer.
• Cashflow impact: Remember that the VAT you collect is not yours. You are effectively holding it on trust for HMRC until the return is filed and paid. Poor cashflow planning here is one of the most common reasons businesses fall behind with VAT.

For project-based work, such as construction contracts or engineering projects, make sure your VAT treatment aligns with your milestones and payment terms. If you bill upfront deposits or stage payments, you need clear and consistent rules on when VAT is triggered.

We often help clients build simple pricing and cashflow models so they can see, in plain figures, what VAT registration will do to margins and working capital before they make any commitments. If that would be useful for you, get in touch with our team.

MTD, records and returns: Staying compliant as you grow

Once you are VAT-registered, you must keep digital records and file VAT returns using compatible software under MTD. HMRC guidance makes clear that this applies to any business that has exceeded the VAT threshold at any time since April 2019, even if turnover later falls (HMRC, 2025).

For growing businesses, the practical steps are as follows.

• Choosing software: Select MTD-compatible software that aligns with your invoicing and payment collection processes. For construction and engineering firms, integration with job costing and the Construction Industry Scheme (CIS) is important. For tech businesses, recurring billing and multi-currency support may matter more.
• Setting up digital links: Avoid manual re-typing between systems and spreadsheets where possible. Digital links reduce error risk and save time at quarter end.
• Establishing routines: Decide who is responsible for coding transactions, reviewing VAT treatment and approving returns. Build a simple month-end checklist rather than leaving everything to the deadline.

Filing on time and paying on time are fundamental. Late returns can trigger penalties and draw HMRC’s attention to your business when you least want it. If you struggle with the admin, outsourcing VAT returns to a specialist accountant is often cheaper than fixing mistakes later.

Common VAT pitfalls for growing construction and tech businesses

We regularly see similar VAT problems across our construction, engineering and tech-focused clients. Here are a few issues to watch for.

• Ignoring the rolling 12-month test: Owners often track VAT against their financial year only. The law looks at the last 12 months on a rolling basis, so a strong quarter can push you over without noticing.
• Misunderstanding VAT on disbursements and recharges: Recharging costs to clients is common in engineering and tech. The VAT treatment on recharges is not always the same as the underlying supplier invoice.
• Incorrect use of zero-rating or reduced rates: Construction services can qualify for different rates depending on the type of work and property. Getting it wrong can be costly if HMRC reviews your records.
• Over-reliance on software defaults: Accounting software is a tool, not a decision-maker. If VAT codes are set up incorrectly at the start, errors can run through thousands of transactions before anyone spots them.
• Treating MTD as a one-off project: MTD is an ongoing requirement, not something you set up once and forget. Process changes, staff turnover and new revenue streams all affect how well your digital VAT system works.

Addressing these issues early is far easier than arguing with HMRC after an inquiry has started. If you are unsure about any of the scenarios above, it is worth asking for a VAT review before your next return.

Bringing your VAT strategy together

As more UK firms enter the VAT system, growing businesses cannot afford to treat VAT as an afterthought. The latest ONS data on VAT and PAYE businesses shows that millions of businesses are already operating under the VAT regime, and many more are just below the threshold. That number will continue to rise as turnover grows and thresholds stay fixed.

For owner-managed construction, engineering and tech businesses, the risks are clear: missed registration dates, under-declared VAT, weak cashflow planning and MTD penalties. The upside is equally clear. With the right plan, VAT registration can support better pricing discipline, cleaner financial data and a more professional experience for your clients.

Our guide for growing businesses is simple: know your numbers, monitor your rolling 12-month turnover, plan pricing and cashflow before registering, and make sure your software and processes meet MTD requirements. Use official resources such as HMRC’s VAT registration guidance and Parliament’s briefing on VAT registration policy for a deeper background.

If you would like a tailored guide for growing businesses based on your contracts, projects and client base, we can review your VAT position, model the impact of registration and take care of your returns. To discuss how we can support your VAT planning and compliance, contact us today.