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Debenture Agreement UK: Fixed & Floating Charges

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Part ofLegal Templates

Updated June 2026 · England & Wales
When a company borrows money, the lender usually wants more than a promise of repayment. They want something to fall back on if things go wrong. That is where a debenture comes in. It is the legal instrument that ties a loan to the borrower's assets, giving the lender a claim over those assets if the company defaults. For directors, it is often the first serious security document they sign. For lenders, it is the backbone of commercial lending in the UK. This guide walks through what a debenture does, how fixed and floating charges actually work, what needs to be registered at Companies House, and the pitfalls that catch people out. Whether you are raising finance or extending credit to a company, the detail here matters.

What this document is

A debenture is a written instrument by which a company grants security over its assets in favour of a lender. In practice, it sits alongside a loan agreement or facility letter and does the heavy lifting on security. The debenture itself records the charges being created, identifies the assets caught by those charges, and sets out what happens if the borrower breaches the terms.

Most commercial debentures in the UK contain a combination of fixed charges, which apply to specific, identifiable assets such as land, plant, book debts, or intellectual property, and a floating charge that covers the rest of the company's undertaking. The floating charge allows the business to carry on trading and dealing with its stock and everyday assets until something triggers crystallisation.

At that point, the floating charge fixes on whatever assets the company holds, and the lender can take steps to enforce. A debenture is typically granted by a company or LLP rather than an individual, because only entities registered at Companies House can grant a floating charge in the ordinary sense.

How to use this document

  1. Agree the commercial terms first. Before any debenture is drafted, the lender and borrower need to settle the loan terms, the facility amount, interest, repayment schedule, and what assets will sit behind the debt. The debenture gives effect to these commercial decisions, so getting them clear up front saves time and legal cost when the paperwork is drawn up.
  2. Draft the debenture and identify the charged assets. The document needs to specify which assets are subject to fixed charges and which fall under the floating charge. Book debts, real estate, shares in subsidiaries, and intellectual property are commonly fixed. The floating charge then sweeps up everything else in the company's undertaking, present and future, so the lender's security is comprehensive.
  3. Obtain board approval and execute the deed. The company's directors must approve the granting of security, usually at a board meeting, and the debenture is then executed as a deed. This typically means signature by a director in the presence of a witness, or by two directors, depending on how the company's articles deal with execution formalities.
  4. Register the charge at Companies House within 21 days. This is the step people most often get wrong. A charge created by a company must be registered within 21 days of creation using form MR01, together with a certified copy of the instrument and the filing fee. Miss the deadline and the charge is void against a liquidator, administrator, and other creditors of the company.
  5. Monitor for default and understand enforcement options. Once the debenture is in place, the lender should keep an eye on the borrower's financial health. If a default occurs, the debenture usually triggers the right to appoint an administrator, demand repayment, or enforce against the charged assets. Knowing what the document says about these remedies before anyone needs to use them is sensible on both sides.

Common questions

If you're dealing with this kind of situation, speak to an experienced legal adviser who can walk you through it — from £89.

Common questions

Q What is the difference between a fixed and a floating charge?
A fixed charge attaches to a specific, identifiable asset from the moment it is created, and the company cannot dispose of that asset without the lender's consent. A floating charge hovers over a pool of assets that change in the ordinary course of business, such as stock or cash at bank, and only fixes on those assets when a crystallising event happens. Fixed charges usually give the lender stronger priority on enforcement.
Q Why must a debenture be registered at Companies House?
Registration puts the world on notice that the company has granted security over its assets. If the charge is not registered within 21 days of creation, it becomes void against a liquidator, administrator, and any creditor of the company, which effectively wipes out the lender's security in an insolvency. The underlying debt still exists, but the lender drops back to being an unsecured creditor.
Q Can an individual grant a debenture?
Debentures in the commercial sense are granted by companies and LLPs, because a floating charge is a creature of corporate insolvency law. Individuals can grant security over their own assets, but they use different instruments such as legal mortgages, fixed charges, or general security agreements. If you are dealing with a sole trader or partnership, a debenture is not usually the right document.
Q What triggers crystallisation of a floating charge?
Common triggers include the borrower defaulting on the loan, the appointment of an administrator or receiver, the company ceasing to trade, or a specific event listed in the debenture itself. Once crystallisation happens, the floating charge fixes on the assets held by the company at that moment, and the borrower loses the ability to deal with those assets freely.
Q Does a debenture give personal liability to directors?
The debenture itself is granted by the company, so it does not automatically create personal liability for directors. However, lenders often ask directors to sign personal guarantees alongside the debenture, and those guarantees are separate contracts that can put a director's own assets at risk. It is worth reading the full package of documents, not just the debenture, before signing anything.
Q Can more than one debenture exist over the same company?
Yes. A company can grant multiple debentures to different lenders, and priority between them is generally determined by the order of registration at Companies House, subject to any deed of priority the lenders agree. Second-ranking debentures are common in refinancing situations or where mezzanine lenders sit behind senior debt.
Q How is a debenture released once the loan is repaid?
When the secured debt is paid off in full, the lender should provide a deed of release or a letter confirming the charge is discharged. The satisfaction of the charge is then filed at Companies House using form MR04, which updates the public register so future lenders and counterparties can see the security is no longer live.
If you're dealing with this kind of situation, speak to an experienced legal adviser who can walk you through it — from £89.

Sources

This guide is based on primary UK law and official guidance.

Brad Askew, Solicitor (non-practising)

Written & reviewed by

Brad Askew Solicitor (non-practising)

Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice. LegalDocuments.co.uk is not a law firm and does not provide regulated legal advice.

Legal disclaimer
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.