Why do small businesses deliberately stay below the VAT threshold?

The phenomenon, in numbers

The UK has an unusually high VAT registration threshold (at £90,000, the joint highest in the OECD, alongside Switzerland). It also has unusually clear evidence of deliberate behaviour around that threshold. Successive studies have shown businesses clustering just below the line, with turnover figures that pile up immediately under £90,000 and thin out sharply above it.

The Office for Budget Responsibility's most recent estimates put deliberate "bunching" at around 0.5% of non-VAT-registered businesses. That percentage sounds modest, but the directional pattern is well documented across multiple research bodies, the IMF, the OECD, and parliamentary inquiries have all confirmed the existence of a measurable bunching effect.

The 0.5% figure also understates the broader behavioural picture. It captures the businesses where the bunching is statistically obvious. Many more businesses make smaller, less visible adjustments: declining one project a year, refusing certain types of work, or pacing their growth without ever consciously framing it as "avoiding VAT".

The rational reasons

Most decisions to stay below the threshold come from a mix of genuine economic reasoning. Each of these is a real factor, not a misunderstanding.

1. The margin pressure on B2C businesses

For a business selling primarily to consumers or to non-VAT-registered customers, the 20% VAT on output is a genuine commercial problem. The business has three options on registration:

• Raise prices by 20% and accept the competitive risk
• Absorb the 20% and lose that proportion of gross margin
• Split the difference and lose part of both

For a hair salon at £85,000 charging £40 for a cut, the registered competitor either charges £48 (and risks customers leaving) or absorbs the £8 (and loses 20% of revenue on every appointment). The arithmetic isn't always survivable, particularly in price-competitive consumer markets.

2. The compliance overhead is real

VAT registration brings quarterly returns under Making Tax Digital, the cost of MTD-compliant accounting software, the time spent classifying transactions correctly, and the ongoing risk of compliance errors triggering penalties. For a small business at £85,000 of turnover, the time and money cost can run to several hundred pounds a year minimum, and meaningfully more for businesses with mixed product ranges or international sales.

3. Pricing visibility matters in some sectors

In sectors where prices are publicly displayed (online retail, hospitality menus, marketplaces), the addition of VAT can be operationally awkward and commercially visible in ways that affect customer behaviour. The friction isn't just financial; it's also about how the business presents itself in the market.

4. The cliff edge is real and asymmetric

A business at £85,000 of turnover sits comfortably outside the VAT system. A business at £91,000 has crossed it. The £6,000 of additional turnover can produce a step change in compliance, pricing, and margin position. The asymmetry is what economists call the "notch" effect: a small change in turnover produces a disproportionate change in net economic position.

The less-rational reasons

Alongside the genuine economic reasoning, several non-rational or partially-rational motivations drive bunching. These aren't always acknowledged by the businesses themselves, but they show up consistently in research and practice.

1. Loss aversion outweighs equivalent gains

The behavioural economics literature is consistent: people typically value avoiding a loss roughly twice as much as gaining an equivalent benefit. Applied to VAT, the perceived "loss" of registering (paying VAT to HMRC, dealing with returns) feels larger than the equivalent "gain" from input VAT recovery and growth headroom, even when the net economic effect is similar.

2. Complexity anxiety

VAT is a genuinely complex tax. For a business owner without an accounting background, the fear of getting registration wrong, mis-classifying supplies, or triggering an HMRC enquiry is a real psychological factor, regardless of how that fear stacks up against the actual statistical likelihood of any of those things happening.

3. Peer norms and sectoral conventions

Certain sectors have strong informal norms around staying below the threshold: small trades, sole-practitioner consulting, beauty services, certain types of retail. "Most people in my industry stay below" can become its own reason, even when the underlying business case for any individual operator might point the other way.

4. The "I'd have to think about it" friction

Even when registration would be advantageous, the act of analysing the decision, setting up new systems, and changing the business's commercial position requires effort. Inertia often defaults to the status quo, particularly for businesses where the threshold approach has worked for several years.

The costs of staying below that don't show up in the accounts

The argument against bunching isn't that it's always wrong. It's that the visible "savings" from avoiding VAT are usually visible, while the costs are often hidden. A balanced view typically reveals more cost than business owners initially recognise.

Foregone revenue

The most direct cost. Turnover artificially capped at £89,000 means foregoing all the revenue beyond that line. For a business that could grow to £150,000 in 18 months, holding back at £89,000 isn't a £1,000 saving on VAT; it's a £60,000 loss in revenue, partially offset by avoided VAT.

Foregone input VAT recovery

A registered business reclaims VAT on its costs. Unregistered, that VAT is a permanent cost. For businesses with significant VAT-bearing expenses (equipment, software, professional fees, marketing, subcontractors), the foregone recovery can run into the thousands per year.

Foregone pre-registration VAT

On its first VAT return, a newly-registered business can reclaim VAT on goods bought up to four years before registration (if still in use) and services bought up to six months before. Businesses that delay registration also delay or lose access to this window, with consequences that can be substantial for businesses that invested heavily before reaching the threshold.

Sectoral competitive disadvantage

In some sectors, particularly B2B services, larger procurement processes, or supply chains involving VAT-registered customers, being unregistered is a competitive negative. Customers who can reclaim VAT prefer suppliers who charge it; suppliers who don't can be excluded from tenders or treated as "very small" businesses with limits on the work they can take on.

Strategic inflexibility

A business pacing growth to stay below the threshold often locks itself out of opportunities that would require crossing it temporarily. A large one-off contract, an unexpected commercial opportunity, a competitor exiting the market, all of these are harder to capture when the business's operating logic is built around capping turnover.

Where this gets ambiguous: the right answer for any specific business depends on its specific customer mix, cost base, growth trajectory, and sector position. Generic advice in either direction (always register early, or always stay below) misses the point that the calculation is genuinely different for different businesses. Two businesses with identical headline turnover can reach opposite correct answers, and there's no shortcut around looking at the actual numbers.

The policy debate behind the behaviour

The fact that a measurable portion of UK small businesses cap their growth to avoid the VAT threshold is itself a contested policy issue. Different bodies reach opposite conclusions about what to do about it:

• The Federation of Small Businesses argues for raising the threshold further, on the basis that a higher line would give businesses more room to grow before facing the cliff
• Reform UK has proposed doubling the threshold to £180,000, with a similar growth-headroom argument
• The Tax Foundation and several international bodies argue for substantially lowering the threshold, on the basis that a lower cliff is less distortive than a higher one and that a broader VAT base would be more efficient
• The IMF has at various times argued for both lower thresholds and tapered mechanisms
• The current UK government's position is that the threshold is at the right level given the trade-offs between compliance burden and tax revenue, and that the 0.5% bunching figure is small enough not to warrant intervention

What no major body argues is that the bunching phenomenon doesn't exist. The disagreement is about how big a problem it is and what (if anything) policy should do about it. The debate has been live for years and shows no sign of resolution.

What this means for an individual business

For an individual business owner reading this, the policy debate matters less than the specific question of whether staying below makes sense for their situation. A few principles that apply broadly:

1. Don't assume the threshold strategy is right by default. The pattern that works for "most businesses in your sector" doesn't necessarily work for yours. Look at the actual numbers
2. The customer mix is usually the single biggest factor. A predominantly B2B business has a different answer to a predominantly B2C one with otherwise identical figures
3. Input VAT matters more than people think. Total your VAT-bearing costs honestly. The figure is often larger than expected and changes the maths materially
4. Consider trajectory, not just position. A business that could grow naturally to £150,000 in 18 months has a different decision than one that's likely to sit at £85,000 indefinitely
5. The deregistration option exists. If your turnover falls back below £88,000, you can apply to leave the VAT system. The decision isn't strictly permanent
6. The expensive answer is usually "I haven't actually run the numbers". The genuine analysis often takes an hour or two with someone who knows the system. The decision shouldn't be left to instinct, peer norms, or the path of least resistance

The situations that most often turn into costly mistakes

Bunching is one of the most consequential informal decisions a small business makes, and one of the least examined. The situations below are where the absence of proper analysis most often produces an outcome that costs more than the perceived saving:

• You're capping turnover artificially and want to know whether the implicit "cost of avoiding VAT" actually outweighs the alternative
• You're turning down work to stay below the threshold and want a clear-eyed view of whether that decision is genuinely paying off
• You operate in a sector with strong informal norms around staying below, and want a second opinion on whether the norm applies to your specific business
• You're approaching the threshold organically and want to decide whether to pace down, push through, or register voluntarily before the decision is forced
• You've been sitting just below the line for several years and want to reassess whether the position is still optimal given changes in MTD rules, customer mix, or cost base
• You're an accountant advising a client on bunching strategy and want a second specialist view on the trade-offs
• You're writing or researching about the cliff edge and want a clear-eyed reading of the behavioural and economic dynamics

Whether you're a business owner or an accountant working on a client case, we focus on the VAT questions where extra expertise pays off, and we work in plain English.