Fixed vs Floating Charges: UK Corporate Security and Insolvency Priority

When a UK limited company enters formal insolvency, the distinction between a fixed and a floating charge dictates whether a secured lender recovers its capital or joins the ranks of unsecured creditors facing a total loss. Commercial lending rarely relies on unsecured promises; instead, facilities are underpinned by a debenture-a legal instrument creating specific security interests over the borrower's assets.

For solicitors drafting facility agreements, insolvency practitioners (IPs) distributing realised assets, and credit controllers assessing trade risk, understanding the precise mechanics of these charges is non-negotiable. The legal label attached to a charge in a contract does not guarantee its status in law. If a lender fails to exert the requisite control over an asset, a court will recharacterise a nominally 'fixed' charge as a floating charge, drastically reducing the lender's priority in the insolvency waterfall.

This analysis examines the statutory framework governing corporate security in England and Wales, the mechanics of crystallisation, the impact of HMRC's secondary preferential status, and the practical steps professionals must take when assessing a company's secured debt profile.

The Statutory Framework: Registration and Perfection

The creation of a charge is governed by Part 25 of the Companies Act 2006. Section 859A dictates that any charge created by a company must be registered with the Registrar of Companies within 21 days of its creation.

Filing Form MR01 (Particulars of a charge) perfects the security. Failure to register within this strict 21-day window has severe consequences: the charge becomes void against a liquidator, an administrator, and any other creditor of the company. While the underlying debt remains valid, the lender is stripped of its secured status, ranking entirely unsecured.

Because of this binary risk, conducting a thorough company charge check is the foundational step in any corporate due diligence, acquisition, or credit risk assessment. It reveals not only the existence of secured debt but the specific assets encumbered and the identity of the secured parties.

The Nature of a Fixed Charge: Absolute Control

A fixed charge is a form of security attached to specific, identifiable assets. It provides the highest level of protection for a lender.

The defining legal characteristic of a fixed charge is the degree of control the lender (the chargee) exercises over the asset. The company (the chargor) is strictly prohibited from selling, transferring, disposing of, or creating subsequent security over the asset without the express, prior written consent of the lender.

Assets typically subject to a valid fixed charge include:

If the borrower defaults, the lender has a direct, immediate claim to the specific asset. They can appoint a Law of Property Act (LPA) receiver to seize and sell the property to recover the debt. Because the lender maintains strict negative control over the asset's disposal, a fixed charge sits at the absolute top of the payment hierarchy during insolvency, ranking above almost all other creditor classes.

Floating Charges: Circulating Assets and Flexibility

Unlike its fixed counterpart, a floating charge is an equitable security interest that 'hovers' over a fluctuating class of assets.

Defined historically by Lord Macnaghten in Illingworth v Houth [1904], a floating charge applies to assets that change in the ordinary course of business (circulating assets). This arrangement is a commercial necessity; it allows a trading company to buy, sell, and replace stock, or collect and spend cash, without seeking the bank's permission for every daily transaction.

Floating charges generally cover:

The Mechanics of Crystallisation

A floating charge remains dormant until a specific trigger event occurs, at which point it 'crystallises'-converting instantly into a fixed charge over the assets held by the company at that exact moment.

Common crystallisation triggers written into modern debentures include:

Once crystallised, the company loses its delegated authority to deal with those assets. The charge attaches firmly to the inventory, cash, and debtors existing at that precise second.

The Recharacterisation Risk: Spectrum Plus and Book Debts

The distinction between fixed and floating charges is frequently litigated because lenders naturally want the priority of a fixed charge over highly liquid assets like book debts (unpaid customer invoices).

For decades, banks drafted debentures labelling security over book debts as a 'fixed charge', yet allowed the company to collect the debts and spend the proceeds freely in their daily operations.

This practice was dismantled by the House of Lords in the landmark case of [National Westminster Bank plc v Spectrum Plus Ltd [2005] UKHL 41](https://www.bailii.org/uk/cases/UKHL/2005/41.html). The court ruled that the label used in the debenture is irrelevant if the commercial reality does not reflect it. Because Spectrum Plus was free to draw on the account where the collected debts were deposited, the bank did not have control. Therefore, the charge was floating, not fixed.

To create a valid fixed charge over book debts today, a lender must require the company to pay the collected debts into a blocked trust account, over which the company has no withdrawal rights. Because this starves a business of working capital, true fixed charges over book debts are rare outside of specific invoice discounting or factoring facilities.

The Insolvency Waterfall: Priority of Payments

The distinction between charge types becomes critical the moment a company enters administration or liquidation. The Insolvency Act 1986 dictates a strict statutory 'waterfall' of payments. Funds realised from the sale of assets must be distributed in this exact sequence.

| Priority Rank | Creditor Category | Source of Funds / Notes |

| :--- | :--- | :--- |

| 1 | Fixed Charge Holders | Paid exclusively from the realisations of the specific secured asset, minus the costs of selling that asset. |

| 2 | Expenses of the Insolvency Estate | The IP's fees, legal costs, and trading expenses incurred during the insolvency procedure. |

| 3 | Preferential Creditors | Employee wage arrears (capped), holiday pay, and pension contributions. |

| 4 | Secondary Preferential Creditors | HMRC (for VAT, PAYE, Employee NICs, and CIS deductions). Reintroduced in December 2020. |

| 5 | The Prescribed Part | A ring-fenced fund carved out of floating charge realisations for the benefit of unsecured creditors. |

| 6 | Floating Charge Holders | Paid from remaining floating asset realisations, after HMRC and the Prescribed Part are satisfied. |

| 7 | Unsecured Creditors | Trade suppliers, customers, landlords, and HMRC (for Corporation Tax). |

| 8 | Statutory Interest | Interest on proven debts from the date of insolvency. |

| 9 | Shareholders / Members | Any remaining surplus (exceedingly rare). |

The Impact of HMRC and the Prescribed Part

Two statutory mechanisms severely dilute the value of a floating charge:

1. HMRC Secondary Preferential Status: Reintroduced by the Finance Act 2020, HMRC now ranks ahead of floating charge holders for specific tax debts collected on behalf of others (VAT, PAYE). Because these tax deficits can be massive in a failing company, they frequently wipe out the entirety of the floating charge realisations, leaving the secured lender with nothing from the circulating assets.

2. The Prescribed Part: Under Section 176A of the Insolvency Act 1986, a portion of the floating charge realisations must be set aside for unsecured creditors. For charges created after 6 April 2020, this is calculated as 50% of the first £10,000, plus 20% of the remainder, capped at a maximum of £800,000.

Worked Example: Distribution in Liquidation

To understand the practical impact of the waterfall, consider the composite scenario of Midlands Precision Engineering Ltd, which enters compulsory liquidation.

Asset Realisations:

Creditor Claims:

The Distribution:

1. Fixed Charge: The Bank takes £1,000,000 directly from the factory sale. The remaining £200,000 from the factory sale falls into the general floating pool. The floating pool is now £800,000 (£600k stock + £200k surplus).

2. Costs: The Liquidator takes £80,000. (Pool remaining: £720,000).

3. Preferential: Employees receive £20,000. (Pool remaining: £700,000).

4. Secondary Preferential: HMRC takes £400,000 for VAT/PAYE. (Pool remaining: £300,000).

5. Prescribed Part Calculation: Calculated on the remaining £300,000 floating realisations. (50% of £10k = £5,000) + (20% of £290k = £58,000). Total Prescribed Part = £63,000.

6. Floating Charge: The Bank receives the remainder of the pool after the Prescribed Part is deducted. £300,000 - £63,000 = £237,000. (The Bank suffers a £263,000 shortfall on its floating facility).

7. Unsecured Creditors: The trade suppliers share the £63,000 Prescribed Part pro-rata against their £900,000 debt, yielding a return of exactly 7 pence in the pound.

This scenario illustrates why lenders aggressively seek fixed security and why trade creditors must meticulously assess a target's secured debt profile before extending credit.

Hardening Periods and Anti-Avoidance (Section 245)

Directors of a distressed company cannot simply grant a floating charge to a favoured creditor on the eve of insolvency to elevate their priority.

Under Section 245 of the Insolvency Act 1986, a floating charge is invalid if it was created within a specific 'hardening period' prior to the onset of insolvency, unless it was granted in exchange for 'new consideration' (e.g., new money advanced at the same time the charge was created).

The hardening periods are:

This anti-avoidance provision ensures that existing unsecured debt cannot be retrospectively secured just before a collapse, protecting the general body of creditors.

Due Diligence Framework: Assessing Corporate Security

For professionals evaluating a company's financial health, reviewing the public register is a mandatory step. Apply this framework when assessing a target:

1. Identify Outstanding Charges: Review the target's filing history for MR01 (creation) and MR04 (satisfaction) forms. Determine how many active charges exist.

2. Analyse the Debenture: Obtain the registered instrument. Does it contain a 'qualifying floating charge' (QFC)? A QFC holder has the power to appoint an administrator out of court under Schedule B1 of the Insolvency Act 1986, giving them immense control over the company's fate.

3. Check for Negative Pledges: Does the existing debenture prohibit the creation of subsequent security? If so, any new lender requires a formal deed of priority or waiver from the first charge holder.

4. Assess Asset Encumbrance: Cross-reference the fixed charges against the company's balance sheet. Are the primary revenue-generating assets fully encumbered?

5. Cross-Reference Insolvency Risk: A heavily secured company facing aggressive creditor action is a severe risk. Professionals should routinely execute a winding up petition search to ensure no hostile action is pending that could trigger crystallisation.

Traditional Due Diligence vs Corp Intel

Historically, assessing a company's security profile required a highly manual workflow. A professional would access the Companies House register, navigate to the 'Charges' tab, and manually tally the outstanding MR01s against the satisfied MR04s. They would then download the individual PDF debenture documents-often poorly scanned, 40-page legal texts-and read through the boilerplate to identify qualifying floating charges, negative pledges, and the specific assets caught by fixed clauses. To monitor for new charges, credit controllers relied on manual diary entries to re-check the register every few months, risking exposure if a distressed client granted emergency security between checks.

Corp Intel fundamentally changes this workflow. Instead of parsing fragmented PDFs, professionals access structured intelligence. The platform aggregates a company's entire security profile, immediately flagging active charges, highlighting QFCs, and mapping the hierarchy of secured lenders.

More importantly, professionals can monitor a UK company free through the platform. If a client, supplier, or acquisition target files a new MR01, or if a creditor presents a winding up petition that threatens to crystallise a floating charge, the system pushes an immediate alert. This shifts due diligence from a static, point-in-time check to a continuous, defensible risk management process, ensuring advisers and credit teams are never caught off guard by a sudden change in a target's capital structure.

FAQ

Q: Can a company sell an asset subject to a floating charge?

A: Yes. Until a trigger event causes the charge to crystallise, the company retains the delegated authority to deal with circulating assets (like stock or cash) in the ordinary course of business without seeking the lender's permission.

Q: What is the 'Prescribed Part' in UK insolvency?

A: It is a statutory ring-fenced fund carved out of the realisations of floating charge assets, reserved exclusively for unsecured creditors. For charges created after 6 April 2020, it is capped at £800,000.

Q: How do I know if a company has paid off a secured loan?

A: The company or lender should file Form MR04 (Statement of satisfaction in full or in part of a charge) at Companies House. Once processed, the charge status updates to 'Satisfied', indicating the security interest over those assets has been released.

Q: What happens if a charge is not registered within 21 days?

A: Under s.859A of the Companies Act 2006, the charge becomes void against a liquidator, administrator, or creditor. The underlying debt remains valid, but the lender loses all priority and becomes an unsecured creditor.

Q: Does a fixed charge over book debts guarantee priority?

A: Not automatically. Following the Spectrum Plus ruling, courts look at the commercial reality of control. If the company can freely collect and spend the debts without the lender's interference, the court will recharacterise it as a floating charge, pushing the lender down the insolvency waterfall.

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Defend your position and monitor corporate risk.

Whether you are assessing a new borrower, conducting M&A due diligence, or managing a ledger of trade credit, understanding a target's exact security profile is critical. Use Corp Intel to automate your company charge check, review outstanding debentures, and set up real-time alerts for new security filings or insolvency petitions before they impact your recovery.