What is Surety?
Updated: 25 March 2026
A surety (borgtocht) is an agreement in which a third party (the guarantor) undertakes to pay the debt of the principal debtor if the debtor fails to do so. The guarantor is only liable once the principal debtor defaults. A surety is personal: the guarantor pledges their own assets. This makes it a heavier obligation than many entrepreneurs realise, especially when a director-owner personally guarantees debts of their limited company.
How does surety work?
A surety creates a triangular relationship between creditor, principal debtor and guarantor. The creditor (for example a landlord or supplier) gains extra certainty of payment. The principal debtor (your company) gains access to a contract or financing that would otherwise be unavailable. The guarantor assumes the risk if the principal debtor defaults.
The difference with a bank guarantee is fundamental. With a bank guarantee, the bank pays on first demand, regardless of whether the principal debtor is actually in default. With a surety, the guarantor can invoke the same defences as the principal debtor. The guarantor can also demand that the creditor first pursues the principal debtor before turning to the guarantor.
For private guarantors, additional protection applies. If a spouse or registered partner provides a surety without consent from the other partner, that partner can annul the surety. This does not apply if the surety was given in the ordinary course of business.
In practice, sureties are common in commercial leases where the landlord requires a personal guarantee from the director alongside the lease with the company. Supplier credit and construction contracts also frequently require sureties as additional security.
Why does this matter for SMBs?
A surety can have enormous personal financial consequences. As a director who personally guarantees the lease of their business, you are personally liable for the full rent debt if the company goes bankrupt. Research by World Commerce and Contracting shows that 9.2 per cent of annual revenue is lost to poor contract management. That percentage can grow exponentially when sureties are not properly registered and an entrepreneur does not know what they have personally guaranteed.
Many entrepreneurs sign a surety at the start of a lease and then forget about it. The contract gets renewed, the rent increases, but the surety continues unchanged, meaning the risk grows without you realising it.
How to manage this correctly
- 1Register every surety in your contract register with a clear marker of the maximum risk amount
- 2Always limit sureties to a maximum amount and a fixed term
- 3Check on renewal whether the surety automatically extends and whether the amount is still appropriate
- 4Ensure the partner of a private guarantor has given written consent
- 5Consider alternatives: a bank guarantee or deposit gives the creditor security while limiting your personal risk
Related research
SME Contract Management Statistics (2026): 28 Data Points on Cost Savings, Risk & AI AdoptionSources
Manage all your contract deadlines automatically
Tracking Contracts alerts you well ahead of every notice deadline. No spreadsheets, no missed renewals.
Start free monthRelated terms
Bank Guarantee
A bank guarantee is a written commitment from a bank to a beneficiary (typically the client) that th…
Finance & costsCommercial Lease
A commercial lease is a contract for renting a property or space for business purposes. Lease law di…
Contract typesBankruptcy
Bankruptcy is a court-declared state of insolvency in which a debtor can no longer meet its outstand…
Liability & law