What Belgium's 2026 Civil Code Reforms Mean for Guarantees and Personal Security Rights, Practical Guidance for Lenders, Companies and Property Owners

On 1 January 2026 the new rules on civil code guarantees in Belgium took effect, fundamentally reshaping how personal security rights are created, maintained and terminated under Belgian law. Title I of Book 9 (“Securities”) of the modernised Belgian Civil Code introduces a unified regime for suretyship, tightens proportionality requirements for guarantors, grants new termination rights for indefinite guarantees, and recalibrates obligations for lenders, corporate guarantors and property owners alike. This guide provides the practitioner-level detail that in-house counsel, bank legal teams, real-estate lawyers and company directors need to assess exposure, update documentation and achieve full compliance with the reformed framework.

Executive Summary: What Changed and What to Do Now

The core reforms introduced by Book 9, Title I of the Belgian Civil Code can be distilled into five headline changes that every stakeholder should understand before reviewing a single contract:

• Unified personal security regime. The former fragmented rules on guarantees have been consolidated into a single, coherent framework governing suretyship and other forms of personal security, replacing outdated provisions scattered across the old Civil Code.
• Suretyship as the default model. The reformed law establishes suretyship (cautionnement / borgtocht) as the primary form of personal security, with stricter conditions imposed on any arrangement that attempts to function as an independent or autonomous guarantee.
• Mandatory proportionality assessment. Creditors must now verify, and be able to demonstrate, that the guarantee obligation is proportionate to the guarantor’s financial capacity at the time the commitment is made.
• Termination rights for indefinite guarantees. Individual guarantors who entered into guarantees of indefinite duration now have a statutory right to terminate by giving reasonable notice, subject to specific procedural requirements.
• Enhanced pre-contractual information duties. Creditors owe guarantors clearer, more comprehensive disclosure about the nature, scope and risks of the guaranteed obligation before the guarantee is signed.

Industry observers expect these changes to trigger a significant documentation overhaul across the Belgian lending market. The five-point action plan below sets out the immediate priorities:

1. Inventory all existing guarantees, categorise by type (suretyship, independent guarantee, company guarantee) and identify which fall under the new regime.
2. Conduct a proportionality audit, assess whether each guarantee meets the new proportionality standard and document the assessment.
3. Update standard-form documentation, revise guarantee templates, loan agreements and security packages to reflect the reformed civil code guarantees Belgium framework.
4. Issue required pre-contractual disclosures, prepare compliant information packs for new and, where applicable, continuing guarantors.
5. Establish a termination-management process, put in place procedures to handle guarantor termination notices under the new statutory right.

Background: Book 9 and the Legislative Context

Belgium’s multi-year modernisation of its Civil Code has progressively replaced the Napoleonic-era code with contemporary legislation organised into thematic “Books.” Book 9, titled “Securities” (Zekerheden / Sûretés), addresses the full spectrum of security rights, both personal and real, and represents one of the final major instalments of the reform programme. Title I of Book 9 deals specifically with personal security rights and entered into force on 1 January 2026.

The legislative objective was threefold: to modernise rules that had remained largely unchanged for two centuries, to codify established case law and commercial practice, and to rebalance the relationship between creditors and guarantors in line with contemporary proportionality and consumer-protection principles. The bill introducing Title I was passed by the federal legislature in 2025, published in the Moniteur belge, and became operative at the start of 2026.

Timeline of Key Legislative Dates

Practitioners should consult the transitional provisions published in the Moniteur belge to determine the precise scope of grandfathering for pre-existing security arrangements. Early indications suggest that while guarantees concluded before the entry-into-force date generally remain governed by the old rules for their remaining term, any amendment, renewal or extension triggers application of the new regime.

Key Changes to Personal Security Rights and Civil Code Guarantees in Belgium

The reformed Title I introduces a coherent architecture for personal security rights that departs from the old code in several material respects. Understanding the distinction between the main categories, and the practical consequences of each, is essential for anyone drafting, advising on or holding guarantee obligations under Belgian law.

Suretyship Versus Independent Guarantees: What Is Permitted

Under the reformed Belgian Civil Code Book 9, suretyship (cautionnement) is firmly established as the standard personal security mechanism. A suretyship is accessory in nature: the guarantor’s obligation mirrors and depends upon the validity and extent of the principal debtor’s obligation. This accessory character means that the surety can invoke every defence available to the principal debtor and that the guarantee extinguishes automatically when the underlying debt is discharged.

Independent or autonomous guarantees, where the guarantor’s obligation is deliberately separated from the underlying debt, are not prohibited outright, but the new framework subjects them to significantly tighter conditions. The legislature intended to prevent the circumvention of guarantor protections through contractual devices that strip away the accessory character of the commitment. In practice, industry observers expect that many arrangements previously labelled as “independent guarantees” will now be recharacterised as suretyships, with all attendant protections applying by operation of law.

The likely practical effect for lenders is this: if a creditor wishes to obtain a personal security that does not carry the full suite of guarantor protections, the drafting must carefully delineate the independent nature of the obligation and meet the reformed code’s formal requirements. Failure to do so risks judicial reclassification as a suretyship in Belgium.

Proportionality and Limits: Guarantor Protection Rules

One of the most significant innovations in the reformed regime is the introduction of a mandatory proportionality requirement. At the time a guarantee is entered into, the creditor must assess, and retain evidence of, whether the guarantor’s commitment is proportionate to that person’s assets and income. A guarantee that is manifestly disproportionate to the guarantor’s financial capacity may be reduced by the court or, in extreme cases, declared unenforceable.

This requirement applies to all suretyships and, according to practitioner commentary, extends to any personal security arrangement that benefits from the reformed code’s protective provisions. For lenders, the practical consequence is the need to conduct and document a financial capacity assessment of the guarantor before execution, much as a creditworthiness assessment is required for borrowers under consumer-lending regulations. Corporate guarantors are not exempt: where a company provides a guarantee that is disproportionate to its net assets or financial position, the same risk of judicial reduction exists.

Pre-Contractual Information Duties

The reformed civil code guarantees Belgium framework imposes enhanced disclosure obligations on creditors. Before a guarantee is signed, the creditor must provide the prospective guarantor with clear, comprehensible information about:

• The nature and scope of the guaranteed obligation, including the maximum amount or formula for determining it
• The principal debtor’s financial position, to the extent reasonably known to the creditor
• The risks associated with the guarantee, including the possibility of enforcement and the guarantor’s potential personal liability
• The guarantor’s right to invoke defences and, where applicable, the right to terminate

Failure to comply with these information duties can result in the guarantee being declared null or, at a minimum, entitle the guarantor to damages. Lenders should therefore develop standardised information packs and ensure delivery is documented.

Formal Requirements

The new provisions also tighten the formal requirements for a valid suretyship. A guarantee given by a natural person must be executed in writing and must include a specific hand-written mention (or its electronic equivalent) of the maximum guaranteed amount. The absence of these formalities renders the guarantee unenforceable. For company guarantees, additional corporate governance formalities, particularly board or shareholder authorisation, may be triggered depending on the entity type and the size of the commitment.

Guarantor Rights and Termination of Guarantees

Among the most discussed features of the reformed personal security rights regime is the new statutory framework for guarantor termination. Under the old code, the ability of a guarantor to exit an ongoing guarantee was limited and heavily dependent on contractual terms. The 2026 reforms change this landscape materially.

Individual Guarantors: Termination of Indefinite Guarantees

Where an individual has entered into a guarantee of indefinite duration, common in revolving credit facilities, ongoing supply arrangements and group treasury structures, the reformed code grants a statutory right to terminate by giving reasonable notice to the creditor. The notice must be in writing, and the termination takes effect only after the expiry of a reasonable notice period. Critically, termination does not release the guarantor from liability for obligations that arose before the termination date; it operates prospectively, shielding the guarantor from exposure to future debts of the principal.

The procedure for exercising this right can be summarised as follows:

1. The guarantor sends written notice of termination to the creditor, specifying the intention to terminate the guarantee.
2. The notice must allow for a reasonable period before taking effect, the code does not prescribe a fixed number of days, leaving “reasonableness” to be assessed on a case-by-case basis in light of the nature of the guaranteed obligations and market practice.
3. Upon expiry of the notice period, the guarantee ceases to cover new obligations of the principal debtor.
4. The guarantor remains liable for obligations that accrued before the termination date, subject to any applicable limitation periods.

Corporate Guarantors: Special Considerations

The termination right for indefinite guarantees applies in principle to corporate guarantors as well, though the practical dynamics differ. A corporate guarantee often sits within an intra-group arrangement or a financing package, and early termination may trigger cross-default or mandatory prepayment clauses in the underlying loan documentation. Companies considering termination should therefore map downstream consequences across all related agreements before serving notice.

Additionally, the reformed rules interact with corporate governance requirements under the Belgian Code of Companies and Associations. A board resolution may be needed to authorise the termination, mirroring the resolution that should have authorised the original guarantee.

Effect on Continuing and Standing Guarantees

Standing or omnibus guarantees, which secure all present and future obligations of a debtor toward a creditor, are particularly affected. Under the reformed regime, these arrangements are treated as indefinite-duration guarantees unless they contain a clear expiry date or cap. The practical implication is that any standing guarantee without a defined term is now subject to the statutory termination right. Lenders holding such guarantees should proactively review their portfolios and decide whether to renegotiate fixed-term arrangements or accept the risk of guarantor exit.

Property Security Rights: Mortgages, Pledges and Real-Estate Consequences

While Title I of Book 9 focuses on personal securities, the broader Book 9 reform programme also addresses property security rights, mortgages, pledges and privileges, that interact closely with guarantee arrangements in real-estate and structured-finance transactions. Practitioners dealing with civil code guarantees in Belgium must understand these interconnections.

Mortgage Lifecycle: Creation, Registration and Enforcement

The reformed rules clarify and modernise the mortgage lifecycle. Key changes include:

• Creation. Mortgage agreements must comply with updated formal requirements, including more precise identification of the secured obligations and the mortgaged property.
• Registration. The registration regime at the Mortgage Registry (Bureau des Hypothèques / Hypotheekkantoor) has been updated to accommodate electronic filing and to clarify priority rules among competing creditors.
• Enforcement. Enforcement procedures have been streamlined, and the interaction between mortgage enforcement and insolvency proceedings has been clarified, reducing ambiguity that plagued the old regime.

For lenders holding mortgage-backed loans, the likely practical effect will be the need to review existing mortgage deeds for compliance with the updated formal requirements, particularly where a refinancing, amendment or property transfer triggers re-registration.

Cross-Border and Transfer Impacts

The reforms also address the treatment of mortgages when secured property is transferred. The new rules codify the principle that a mortgage follows the property, regardless of the identity of the new owner, but introduce clearer notification and consent requirements for the parties involved. In cross-border transactions, practitioners should be attentive to the interaction between the reformed Belgian mortgage rules and the applicable conflict-of-laws framework, particularly for properties situated in Belgium but owned by foreign entities.

Practical Checklist for Property Security Reviews

• Confirm that all mortgage deeds comply with the updated formal identification requirements
• Verify registration status and priority ranking at the Mortgage Registry
• Review enforcement clauses for compatibility with the streamlined procedures
• Assess whether any upcoming transfer, refinancing or amendment will trigger re-registration under the new rules
• For real estate guarantees involving personal suretyship, cross-check that the guarantee itself meets the proportionality and formality requirements of Title I

Practical Compliance Checklist for Lenders and Companies

Achieving full lender compliance with the reformed civil code guarantees Belgium framework requires a structured approach. The ten-point remediation plan below is designed for bank legal and compliance teams, in-house counsel and company secretaries responsible for guarantee portfolios.

1. Guarantee inventory (immediate). Compile a complete register of all existing personal security arrangements, suretyships, independent guarantees, comfort letters, company guarantees and standing/omnibus guarantees. Classify each by type, duration and counterparty.
2. Regime classification (within 30 days). Determine which guarantees fall under the new regime (post-1 January 2026 or amended/renewed) and which are grandfathered under the transitional provisions.
3. Proportionality audit (within 30 days). For every guarantee subject to the new rules, conduct and document a proportionality assessment of the guarantor’s financial capacity. Retain evidence on file.
4. Pre-contractual information review (within 30 days). Verify that all required disclosures were made (or will be made for upcoming guarantees). Prepare a standardised information pack for use across the organisation.
5. Standard-form document update (within 60 days). Redline and revise all guarantee templates, facility agreements and security packages to incorporate proportionality clauses, updated formality requirements and guarantor termination provisions.
6. Board and governance approvals (within 60 days). For company guarantees, ensure that appropriate board resolutions or shareholder authorisations are in place, both for new guarantees and for any continuing arrangements that require ratification under the updated regime.
7. Termination procedure design (within 60 days). Establish an internal procedure for receiving, processing and responding to guarantor termination notices. Designate responsible personnel and set response timelines.
8. Borrower and guarantor notification (within 90 days). Communicate the key changes to borrowers and guarantors, particularly regarding new termination rights and information duties. Documented notification reduces dispute risk.
9. Training and awareness programme (within 90 days). Brief relationship managers, credit officers and legal teams on the practical impacts of the reforms. Focus on proportionality assessments, documentation changes and termination handling.
10. Amendment strategy, waiver versus restatement (within 180 days). For existing guarantees that must be brought into compliance, decide on a case-by-case basis whether to seek a waiver from the guarantor, execute an amendment or restate the entire guarantee. Each approach carries different risk and cost profiles.

Obligations by Entity Type

Document Redlines and Drafting Guidance

Updating documentation to reflect the reformed personal security rights framework need not be an all-or-nothing exercise. The sample redlines below illustrate the key clauses that require attention. These are indicative and should be adapted to the specific transaction and reviewed by Belgian-qualified counsel.

Guarantee / Surety Wording, Proportionality Clause

Do: Insert a recital confirming that the creditor has assessed and the guarantor has confirmed the proportionality of the guarantee relative to the guarantor’s financial capacity, with a reference to the supporting documentation on file.

Don’t: Rely on generic representations that the guarantor “has the capacity to enter into this guarantee” without a specific proportionality assessment. Such language is unlikely to satisfy the reformed code’s requirements.

Guarantor Termination / Notice Clause

Do: Include a clause acknowledging the guarantor’s statutory termination right for indefinite-duration guarantees, specifying the agreed notice period (which must be reasonable) and the mechanics for service of notice, for example: “The Guarantor may terminate this Guarantee by giving not less than [three/six] months’ prior written notice to the Creditor, provided that such termination shall not affect the Guarantor’s liability in respect of Guaranteed Obligations arising prior to the effective date of termination.”

Don’t: Attempt to exclude or waive the statutory termination right entirely. Such exclusions are likely unenforceable under the new regime and may expose the creditor to challenge.

Mortgage Registration Wording

Do: Ensure the mortgage deed precisely identifies the secured obligations (including any guaranteed amounts) and the mortgaged property in accordance with the updated formal requirements. Include language addressing the interaction between the mortgage and any personal security given in respect of the same obligations.

Don’t: Use legacy “all-monies” descriptions without verifying compatibility with the reformed code’s identification requirements. Overly broad or imprecise descriptions may be challenged at registration or enforcement.

Conclusion and Next Steps

The 2026 reforms to civil code guarantees in Belgium represent the most significant overhaul of personal security rights in over a century. For lenders, companies and property owners, the message is clear: existing guarantee documentation, internal processes and governance frameworks must be reviewed and, in many cases, substantially updated. The proportionality assessment, the statutory termination right and the enhanced information duties are not optional features, they are mandatory rules with real enforcement consequences.

Organisations that act promptly, conducting guarantee inventories, updating templates and training their teams, will minimise disruption and reduce the risk of guarantees being challenged or declared unenforceable. Those that delay face the prospect of non-compliant security packages, guarantor disputes and potential regulatory scrutiny. Qualified Belgian civil-law counsel can provide tailored advice on the specific impact of the reforms on individual guarantee portfolios and transaction structures.

Sources

1. KPMG Law Belgium, New Civil Code rules in force as from 1 January 2026
2. Simont Braun, Book 9 “Securities” Title I personal security notes
3. BDO Belgium, New rules on personal securities
4. Loyens & Loeff, Civil Code reform: Impact on financing arrangements
5. Belgian Official Gazette / e‑Justice (Moniteur belge), consolidated Civil Code text
6. Eversheds Sutherland, Modernization of the Belgian Civil Code