An HMRC security deposit is a lump sum, or a series of instalments, that HMRC can legally require a business to pay before it will let the business keep charging VAT or running PAYE. HMRC issues this demand through a formal Notice of Requirement when it judges there is a serious risk that tax due in future will not be paid. Ignoring the notice is not a safe option, because trading on without providing the security can itself be a criminal offence.
This article explains what the notice means, how HMRC works out the figure, what your options are if you cannot pay, and the risk of continuing to trade without responding.
What an HMRC security deposit is
A security deposit, sometimes called a VAT or PAYE security bond, is money HMRC holds against the risk that a business will not pay tax it owes in the future. It is not a penalty for past mistakes on its own; it is a forward-looking safeguard. HMRC can ask for security under VAT law and separately under PAYE and Construction Industry Scheme (CIS) rules.
HMRC publishes an overview of when and how it uses this power in its guidance on security deposits for VAT, PAYE or CIS.
The demand arrives as a Notice of Requirement (NoR). It sets out:
- The amount HMRC wants as security.
- Whether it must be paid as a single lump sum or in instalments.
- The deadline for paying, or for applying to register a new business subject to security.
- Your right to ask HMRC to reconsider, and your right of appeal.
Why HMRC demands security for VAT or PAYE
HMRC does not issue a notice of requirement HMRC lightly. It typically looks for a pattern that suggests future tax is at real risk of going unpaid, such as:
- A history of VAT or PAYE debts with the same company, or with a previous company run by the same directors.
- Repeated late payment, defaults, or insolvency in a connected business.
- A director linked to a company that was liquidated while owing tax ("phoenixism").
- Signs the business may not survive long enough to pay tax already accruing.
The purpose is protective, not punitive: HMRC is trying to secure future revenue rather than collect a debt that already exists. If you also have older arrears, it is worth reading about your options when you owe HMRC and can't pay, since the two issues often overlap.
How the amount is calculated
HMRC generally bases the figure on your average VAT liability, or average PAYE and National Insurance deductions, over a recent reference period, then projects that forward. Factors that can increase or reduce the figure include:
- Your trading history and payment record with HMRC.
- The scale and volatility of turnover.
- Whether the business is newly registered with limited trading history.
- Any existing arrangement, such as a Time to Pay agreement, already in place.
HMRC's internal guidance sets out how caseworkers should approach the calculation, and the amount is not fixed by statute, so it can vary considerably between businesses. If you think the sum is wrong or disproportionate, you can ask HMRC to review it before the deadline passes.
What happens if you can't pay the deposit
If the deposit genuinely cannot be paid in full by the deadline, the options are limited but real:
- Contact HMRC before the deadline. Explain the position and ask whether instalments are possible; HMRC sometimes allows a phased payment.
- Request a review. You can ask an HMRC officer not involved in the original decision to look at it again.
- Appeal to the tax tribunal. There is a formal right of appeal against a notice of requirement, with a statutory time limit; see how to appeal to the tax tribunal on GOV.UK.
- Take independent advice early. A regulated insolvency practitioner or solicitor can assess whether the underlying business is viable, and what the security demand means for the company's wider financial position.
Doing nothing is the one option that tends to make things worse, because the deadline in the notice keeps running whether or not you respond.
The risk of continuing to trade
This is the part directors often underestimate. If you carry on charging VAT, or running payroll and paying staff, after the date given in the notice without having provided the required security, that can amount to a criminal offence. Conviction can carry a fine and, in serious cases, imprisonment, in addition to any civil debt HMRC pursues. The offence for VAT is set out in the Value Added Tax Act 1994, Schedule 11, paragraph 4.
Beyond the criminal exposure, unresolved HMRC demands of this kind often sit alongside wider arrears and can accelerate HMRC's use of its enforcement powers. It is worth understanding how HMRC debt enforcement works if a security demand is one of several pressures on the company. Directors should also be aware that, in limited circumstances, tax debts can lead to personal exposure — see whether directors can be personally liable for company tax for how that works.
Frequently asked questions
Can I appeal an HMRC security deposit notice?
Yes. You can ask HMRC to review the decision internally, and you have a statutory right to appeal to the First-tier Tribunal (Tax) if you disagree with the requirement or the amount. Appeals must be made within the time limit stated in the notice.
Is the security deposit refunded?
HMRC can release the security, or reduce future requirements, once it is satisfied the risk that led to the notice no longer applies — for example, after a sustained period of on-time filing and payment. It is not automatically refunded on a fixed date.
Can HMRC accept a lower amount or instalments?
HMRC has discretion to agree instalments or, occasionally, a reduced figure where a business can show the original calculation does not reflect its circumstances. This is negotiated with HMRC directly, ideally before the payment deadline.
What if the company simply cannot pay and cannot trade without VAT or PAYE registration?
This is a serious situation that usually needs a proper assessment of the company's viability, not just the security demand in isolation. A regulated insolvency practitioner can advise on the realistic options, including whether the business can continue in another form.
Does a security deposit notice mean HMRC is about to wind up the company?
Not directly. A notice of requirement is separate from winding-up action, but if it is left unanswered alongside other unpaid tax, it can form part of a wider pattern that leads HMRC to consider enforcement.
This article is general information, not legal, financial or insolvency advice, and does not cover every circumstance. Directors facing an HMRC security deposit notice should speak to a regulated specialist about their own situation.
If you would like to understand your options, Harbourfirst can introduce you to a regulated insolvency practitioner or solicitor — start an enquiry.