You send your contract. You’re ready to start the project. The client says “looks good!”… but they never actually sign. So now you’re stuck wondering: is a contract valid if not signed by both parties?
While this might seem like a question that has a black and white answer, there’s actually some legal nuance here that needs to be understood.
While signatures are obviously one of the clearest ways to show agreement, they’re not the only way a contract can become legally binding.
In some cases, a contract may still be valid without both signatures, but relying on that is where things can get messy.
So in this blog post, we’re breaking down what actually makes a contract valid, when a contract might still hold up without signatures, and why having both parties sign is always the best practice!
Short answer: A contract can sometimes be valid even if it is not signed by both parties, but it depends on the facts. If one party sent clear terms and the other party accepted those terms through words, payment, or performance, there may be enough evidence to show an agreement. But an unsigned contract is harder to prove, easier to dispute, and not something you want to rely on as your normal business process.
Quick checklist: What to do if a client has not signed yet
- Pause before starting new work.
- Send a friendly reminder with the contract link.
- Confirm that work will begin after the contract is signed.
- If payment already happened, send a written confirmation of the terms.
- Save all emails, invoices, messages, payment records, and project notes.
- Update your process so clients cannot book, pay, or start without accepting the contract.
What Makes a Contract Valid?
Before we talk about signatures specifically, it’s important to understand what actually makes a contract valid in the first place.
We briefly talked about this when discussing if an online contract is legally binding, but to reiterate, a contract doesn’t become enforceable just because of the format or how it’s signed – it becomes enforceable when certain legal elements are present.
Those key legal elements include:
Offer
Legit contracts must have an “offer”, meaning one party presents specific terms to another. This could be a proposal, agreement, or contract outlining services, deliverables, and expectations.
Acceptance
Next, the other party must agree to those terms. Without acceptance, you may have sent a proposal or draft, but you do not yet have a true agreement. But this is where things can get interesting because acceptance doesn’t always have to be a signature. (More on that in a minute!)
Consideration
Valid contracts also include “consideration,” meaning something of value is exchanged. In most business scenarios, this is payment in exchange for services.
Mutual Intent
Next, valid contracts make it clear that both parties intend to enter into a legally binding agreement – not just a casual or informal conversation.
Capacity
And lastly, valid contracts must involve parties that are legally able to enter into a contract (meaning they are legally able to contract and are not being forced, threatened, or unlawfully pressured into the agreement).
When all of these essential elements are present, a contract can be valid, even if it’s not signed in the traditional sense!
One quick caveat: some types of contracts have special writing or signature requirements under state law. For example, certain contracts involving real estate, guarantees, long-term obligations, or sales of goods over a certain dollar amount may need a signed writing or record to be enforceable. For most everyday service-provider contracts, though, the bigger practical issue is usually proof: can you show that both sides agreed to the same terms?
Is a Contract Valid if it’s Not Signed By Both Parties?
Moving onto the signature talk, the question you’re here for:is a contract valid if it’s not signed by both parties?
The short answer is yes, sometimes… but as you probably expect, it’s not the ideal situation.
A contract can be considered valid without both signatures if there is clear evidence that both parties agreed to the terms and acted on them.
This is often referred to as “implied acceptance” or “acceptance by conduct.”
Here’s an example of a potentially valid, yet unsigned, contract:
Let’s say you send a contract outlining your services and pricing and the client replies, “This looks great, let’s move forward!”
So you move on with your client process by sending them an invoice and they pay it promptly. Then, you begin the work.
By the way, if you realize the client paid but never signed, you can send something like:
“Hi [Client Name], I’m excited to move forward. Before I continue with the next step, I need your signed agreement on file so we both have the final project terms confirmed. You can sign here: [link]. Once that’s complete, I’ll keep everything moving.”
In this example, even without a signed contract, there’s a strong argument that a contract exists because:
✔️ Terms were presented (offer)
✔️ The client accepted them (acceptance)
✔️ Payment was made (consideration)
✔️ Work began
That kind of evidence could support an argument that the client accepted the terms, even though they never signed the agreement.
But here’s where this can get risky…
Just because a contract can be valid without signatures doesn’t mean it’s something you should rely on.
Unsigned contracts create gray areas, such as:
- What exact version of the agreement was accepted?
- Did the client fully review all terms?
- Are all clauses enforceable if not formally signed?
- What happens if a dispute arises later?
Without signatures, it becomes harder to prove agreement and that can weaken your position if something goes wrong!
So while a contract may technically be valid without both signatures, it’s far from best practice, so the stronger and more professional approach is to get the contract signed by both parties before starting work. 📝
With that said, however, there is a certain way to date and sign a contract as a business owner and we cover that here!
|
Situation |
Risk Level |
Why It Matters |
|
Both parties signed the same final agreement |
Lower |
Strongest evidence that both sides accepted the same terms |
|
One party signed and the other paid or started performing |
Medium |
There may be evidence of acceptance, but the unsigned party may dispute the terms |
|
Contract was sent but nobody signed or performed |
Higher |
Harder to show acceptance |
|
Terms were discussed only by phone or DM |
Higher |
Harder to prove the exact terms later |
Do Electronic Signatures Count the Same as Handwritten Signatures?
While it’s clear that a signed contract is the best move for anything business related, another common concern that comes up with this is whether electronic signatures “count” compared to handwritten ones.
In many business contracts, yes, electronic signatures can count.
In the United States, electronic signatures are legally recognized under laws like:
These laws generally say that a contract or signature cannot be rejected just because it is electronic, as long as the legal requirements for electronic contracting are met.
This means signatures collected through platforms like DocuSign, PandaDoc, HoneyBook, Dubsado, or other click-to-sign tools can be a strong way to show acceptance, especially when the platform keeps a timestamp, audit trail, and final copy of the agreement.
So whether someone signs with a typed name, a drawn signature, or a platform-generated e-signature, the bigger question is whether the signature shows intent to accept the agreement.
In fact, for many modern businesses, electronic signatures can actually provide more protection in many cases because they:
✔️ Create a timestamp of when the contract was signed
✔️ Track both parties’ actions
✔️ Store a secure, final version of the agreement
✔️ Reduce the risk of missing pages or incomplete signatures
Speaking of signatures, when you’re signing a contract as a business owner, be sure to avoid these common mistakes!
FAQs About Signing Contracts
What if only one party signs the contract?
If only one party signs, the contract may still be enforceable if the other party clearly accepted and acted on the terms. However, this creates unnecessary risk – without both signatures, it’s easier for the other party to dispute the agreement later.
Is a verbal agreement legally binding?
In some cases, yes. Verbal agreements can be legally binding if they meet the core elements of a contract (offer, acceptance, consideration, etc.).
But they are much harder to prove and enforce, which is why written and signed contracts are always recommended.
What if a client pays but doesn’t sign?
Payment can help show acceptance of the agreement, especially if the client paid after receiving the contract terms. But payment alone can still leave room for disagreement about what terms were accepted. The better process is to require a signed contract before accepting payment or starting work so both parties have a clear final version.
Should I start work before the client signs the contract?
Ideally, no. Even if payment or email approval might help show acceptance, starting work without a signed contract makes it easier for the client to dispute the scope, timeline, payment terms, cancellation terms, or refund policy later. Build your process so the contract is signed before payment is accepted or work begins.
Can I enforce an unsigned contract?
You may be able to enforce it if there is enough evidence showing agreement and performance, but it will likely be more difficult. Courts and legal processes rely heavily on clear documentation, and a signed contract provides that clarity.
Do both parties need to sign the exact same document?
Yes! Both parties should sign the same version of the contract to avoid confusion or disputes about what terms were agreed upon.
If you’re still using proposals, email approvals, or payment links without signed terms attached, it may be time to upgrade your contract process. A strong Client Services Agreement helps you put the scope, payment terms, timeline, cancellation policy, and signature process in one place before the project starts.
How to Make Sure Your Business Contracts Are Signed the Right Way
At the end of the day, the goal isn’t just to have a contract – it’s to have one that’s clearly agreed to, properly executed, and easy to enforce.
That starts with making sure your contracts are:
✔️ Clearly written and easy to understand
✔️ Structured with proper signature blocks for both parties
✔️ Designed for electronic signing
✔️ Finalized and stored after both signatures are complete
Because while unsigned agreements might hold up in certain situations, signed contracts make the agreement much easier to prove.
If you’re ready to stop second-guessing your agreements and start using contracts that are designed to be signed the right way, The Boutique Lawyer Contract Template Shop has you covered!
With professionally drafted contract templates built specifically for service providers and online business owners, you’ll have contracts designed to help protect your business, clarify expectations, and make the client process smoother from start to finish.
Browse The Boutique Lawyer Contract Template Shop to find attorney-drafted templates for service providers and online business owners.
ABOUT THE AUTHOR, AMBER GILORMO – ATTORNEY AND FOUNDER OF THE BOUTIQUE LAWYER
Amber Gilormo is the cool lawyer behind The Boutique Lawyer – a one-stop contract template shop for creative entrepreneurs, online business owners, coaches, and service providers.
From client agreements to digital product terms and everything in between, our lawyer-drafted templates help you put stronger legal foundations in place without getting buried in legal jargon.
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