Authorised Guarantee Agreements in Commercial Leases: What UK Businesses Need to Know

If you’re a business owner in the UK renting commercial premises, you’ve probably come across plenty of paperwork already. But when it comes time to transfer your lease - maybe because you’re selling the business, upsizing, or simply ready to move on - you may be asked to sign something called an Authorised Guarantee Agreement (AGA). Sounds complicated, right? Don’t worry. In this guide, we’ll help you understand what an AGA actually is, when you might need to sign one, what risks it creates, and how you can protect yourself and your business.

Getting the legal side of your lease right is crucial, especially if you want to avoid nasty surprises long after you’ve handed over the keys. So, if you’re facing an AGA, or you just want to plan ahead for your next big step, keep reading to get confident, practical answers.

What Is an Authorised Guarantee Agreement (AGA)?

Let’s start simple: When you take a lease of a commercial property, you become the tenant and are responsible for all the lease obligations - things like paying rent, repairing the property, and following any usage rules.

But what if you want (or need) to transfer your lease to someone else before it ends? Common situations include selling your business, restructuring, or just moving location.

In most modern leases, especially since the Landlord and Tenant (Covenants) Act 1995, you’ll only be liable for lease obligations while you’re the tenant. If you assign the lease to a new tenant, your responsibilities usually end - unless your landlord requires you to sign an AGA.

An Authorised Guarantee Agreement is a legal document where the outgoing tenant (you) agrees to “guarantee” that the incoming tenant (the assignee) will stick to the terms of the lease after the assignment. In plain English: If your successor fails to pay rent or breaches the lease, the landlord can come back to you for payment or to fix the problem.

When Are Authorised Guarantee Agreements Used?

AGAs are very common in commercial property leases in the UK, especially for leases created or varied after 1 January 1996 (thanks to the Landlord and Tenant (Covenants) Act 1995). The Act changed the law so that outgoing tenants are released from lease obligations automatically on assignment - but it gave landlords the right, in certain situations, to ask for an AGA as a condition of approving a lease transfer.

You’re most likely to encounter an authorised guarantee agreement when:

• You want to transfer (“assign”) your commercial lease to another business or individual.
• The lease contains wording allowing or requiring the landlord to insist on an AGA as a condition of granting their consent.
• The landlord has genuine concerns about the financial standing or reliability of your proposed assignee.

In short, if you’re planning to assign your business lease, expect to see an AGA request - unless you’ve negotiated this point upfront or the lease specifically says otherwise.

What Does an Authorised Guarantee Agreement Require of You?

When you sign an authoriszed guarantee agreement, you (the outgoing tenant) guarantee that your successor (the new tenant) will comply with all the lease terms and obligations as if you were still in occupation yourself.

Here’s what that means in practice - your AGA will usually require you to:

• Guarantee rent payments if the new tenant stops paying.
• Cover other lease breaches (such as repair obligations, or using the premises out of hours).
• Take over the lease directly if the new tenant defaults and the landlord wants you to step back in (“privity of contract”).
• Pay outgoings or compensation for any losses the landlord suffers due to the new tenant’s breach.

The guarantee usually lasts until the new tenant lawfully assigns the lease again, the lease ends, or the guarantee is released in writing.

It’s important to note that an AGA is a personal legal commitment. If you run your business as a company, the AGA will usually be signed by the company - but sole traders and partnerships may sign in their own names (sometimes with joint liability). If you’re giving a personal guarantee, this could have serious consequences for your finances if things go wrong.

Are Authorised Guarantee Agreements Negotiable?

While landlords have a statutory right to require an AGA in many cases, you’re not powerless! The exact terms of the authorised guarantee agreement - and even whether one is required - are often negotiable before you sign your lease, or when seeking consent to assign.

Consider these negotiation tips:

• Check your lease: Does it require an AGA on assignment, or just allow it? The language matters. If it says the landlord “may” require one, you might have room to negotiate - especially if your assignee has a strong financial position.
• Limit the scope: Try to ensure the AGA only covers the basic obligations (e.g., rent and repair) and doesn’t extend to indirect losses or unrelated issues.
• Cap the amount: Ask for a cap on your liability, or limit the AGA to a fixed period or until your successor assigns again.
• Negotiate release triggers: Try to include clear language about when your obligations under the AGA will end.

Don’t be afraid to seek help from a specialist property lawyer - a small investment upfront can help avoid costly disputes if the assignee defaults.

For more tips on how to protect your position in commercial transactions, you can also read our guide on essential contract clauses.

What Are the Risks of Signing an Authorised Guarantee Agreement?

It’s perfectly understandable to want to get out of your lease when it no longer suits your business. But signing an AGA isn’t just a formality - it creates real risks that can follow you for years:

• Unexpected financial liabilities: If your assignee stops paying rent or leaves the premises damaged, the landlord can demand those sums from you - even years down the track.
• Credit score and reputation damage: Defaulting on an AGA could harm your business or personal credit rating, or even lead to court action.
• Personal risk for sole traders & partners: If you sign as an individual (not through a limited company), your personal assets could be on the line.
• Continuous exposure: Unless the AGA includes a release trigger, you could remain “on the hook” until the lease ends - which could be years after your business has moved on.

The lesson? Always get the AGA professionally reviewed and consider seeking bespoke negotiation before you sign. For a comprehensive lease transfer, you might also want to review our article on assigning a lease.

When Does Your Liability Under an Authorised Guarantee Agreement End?

A common misconception is that AGAs are always “forever”. Thankfully, this isn’t the case - but it’s still vital to be clear about the end point for your obligations.

In most cases, your liability under an AGA ends when:

• The assignee lawfully assigns the lease to another party (and, if required, that new party provides their own AGA);
• The lease itself comes to an end (by expiry, surrender, or other termination); or
• Your landlord expressly releases you (in writing) from the guarantee.

Even so, if the new tenant breaches the lease before any of these “exit” events, you could still be held liable.

For a full understanding of how lease variations, assignments, and guarantees work together, it’s essential to have your documents (including any AGA) reviewed as part of the business sale or assignment process. There are also situations where “novation” or even deeds of assignment or termination are a better solution - our guide to updating contracts gives more detail.

How Can You Protect Yourself When Required to Sign an Authorised Guarantee Agreement?

If your landlord won’t budge on requiring an AGA, don’t stress - you can still take steps to limit your risk:

• Negotiate up front: The best time to challenge or limit an AGA is before you sign your lease, or at least before you agree to the assignment. Once signed, your leverage is limited.
• Get a strong assignee: Landlords are more likely to ease guarantee requirements if the incoming tenant has a good trading history, references, or even provides security or a rent deposit.
• Limit the length and scope: Ask for a time cap, and limit the obligations to only basic lease terms (not all losses or post-assignment liabilities).
• Consider insurance: Some business insurance products can help cover you for certain liabilities arising from commercial leases - though always check exclusions for assignments and guarantees.
• Document everything: Make sure all agreements about assignment, release, and guarantee are in writing and reviewed by a qualified legal expert.

If you’re selling your business (or shifting location), don’t just focus on the headline sale price - make sure you walk away fully released from any “hidden” liabilities, including AGAs. Our business sale checklist can help ensure you cover all bases.

Do You Need Professional Help for an Authorised Guarantee Agreement?

Understanding and negotiating AGAs is a niche legal area - and a small mistake can put your business at risk down the line. For this reason, it’s wise to work with a legal expert who can:

• Review your lease for AGA clauses before you sign
• Help you negotiate fair and balanced guarantee terms
• Clearly explain what you’re agreeing to - and what the risks are for your business (and you personally!)
• Check associated documents like deeds of assignment, deeds of surrender, novation agreements, or sale contracts connect properly

At Sprintlaw, we help business owners across the UK manage commercial leases, draft and review assignments, and make sure you’re protected from day one. For more lease contract tips, check out our articles on assignments and breaking a commercial lease safely.

Remember: the earlier you get legal advice, the more options you’ll have to manage risk, save money, and keep your business moving forward confidently.

Key Takeaways

• An Authorised Guarantee Agreement (AGA) makes the outgoing tenant responsible if the new tenant breaches the lease after an assignment.
• Landlords frequently require AGAs as a condition of allowing a business lease to be transferred - especially for leases entered into after 1996.
• Signing an AGA means you could be called on for rent, repairs, or to step back in if the new tenant defaults - so the risk is real and long-lasting without careful limits.
• Always check your lease for AGA requirements before you sign and negotiate the scope and duration upfront where possible.
• Seek professional legal advice before signing or assigning a commercial lease with an AGA to avoid long-term unexpected liability.
• Protect yourself by getting everything in writing and using a lawyer to connect all the moving pieces during business sales or lease assignments.

If you’d like help with Authorised Guarantee Agreements, commercial leases, or anything else related to UK business law, reach out to us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat. We’re here to help you get protected from day one.