Are electronic signatures legally binding? ESIGN, UETA and eIDAS for sales teams

Yes: in the United States and the European Union, an electronic signature on an ordinary commercial contract is legally binding. US federal law says a signature or contract may not be denied legal effect, validity or enforceability solely because it is in electronic form. EU law says the same about admissibility, and gives the highest level of electronic signature the same effect as a handwritten one.

For a sales team that settles the question most people ask. Two questions remain, and they are the ones that matter in a dispute: is this particular document one of the exceptions, and can you prove who signed it and that it was not changed afterwards? This guide walks through the US and EU rules and then through the evidence that makes a signature hold up.

United States: the ESIGN Act

The Electronic Signatures in Global and National Commerce Act of 2000 is the federal baseline. Its core rule, in 15 U.S.C. §7001(a), covers transactions in or affecting interstate or foreign commerce, which in practice means most business contracts:

A signature, contract, or other record relating to such transaction may not be denied legal effect, validity, or enforceability solely because it is in electronic form.

A second clause adds that a contract may not be denied effect solely because an electronic signature or record was used in its formation. The law does not prescribe a technology. A typed name, a drawn signature or a click on “I agree” can all qualify, provided the person intended to sign.

Two further provisions matter for sales documents:

• Consumer disclosures. Where another law requires information to be given to a consumer in writing, delivering it electronically counts only if the consumer has first consented, after being told about their right to paper copies, how to withdraw consent and what technology they need. This applies to required disclosures, not to every B2B contract.
• Accuracy and retention. An electronic record that the law requires to be in writing can be refused if it cannot be retained and accurately reproduced for later reference by everyone entitled to keep it. A signed PDF that all parties can download satisfies this; a signature that only exists inside a vendor’s database may not.

United States: UETA and the states

The Uniform Electronic Transactions Act is a model law published in 1999 that states adopt individually. It gives electronic records and signatures the same standing as paper ones under state law. It has been adopted in 49 states; Illinois was the most recent state to adopt it, in 2021. New York has not adopted UETA and relies instead on its own Electronic Signatures and Records Act, which allows an electronic signature to be used in place of a handwritten one.

UETA and ESIGN work together. ESIGN largely defers to a state’s version of UETA where the state has enacted it, which is why the exact exclusions can vary slightly from state to state.

What US law excludes

The exceptions are where e-signatures genuinely fail. Under 15 U.S.C. §7003, the ESIGN rule does not apply to:

For a typical sales team selling services, software or goods, almost nothing on this list comes up. Sales contracts sit under UCC Article 2, which ESIGN explicitly keeps in scope. The risk lies at the edges: a lease secured on a home, a document that doubles as a regulatory notice, or a contract governed by another country’s law.

European Union: eIDAS and its three levels

The EU rules are set by Regulation (EU) No 910/2014, known as eIDAS and amended by Regulation (EU) 2024/1183, which applies directly in every member state. Article 25 sets out the legal effect in three parts:

1. An electronic signature shall not be denied legal effect or admissibility as evidence in legal proceedings solely because it is electronic or does not meet the requirements for qualified signatures.
2. A qualified electronic signature has the equivalent legal effect of a handwritten signature.
3. A qualified signature based on a qualified certificate issued in one member state is recognised as qualified in all the others.

eIDAS defines three levels of electronic signature, and the difference between them is the strength of the link to the signer:

The practical reading: a simple signature is valid and admissible, but if the other party disputes it, you carry the burden of showing it was really them. A qualified signature has the legal effect of a handwritten one; an advanced signature does not change the legal rule, but its identity and tamper evidence make a dispute much easier to win. Member states decide which specific documents require a qualified signature, so check national law for real estate, employment and public-sector documents.

The evidence that makes a signature hold up

When an electronic signature is challenged, the questions are factual. A good signing process answers them in advance:

• Who signed? A unique link sent to a specific email address ties the signature to whoever controls that inbox. Shared links weaken this.
• When? A timestamp for each signer, recorded by the system rather than typed by a person.
• What exactly? The document should be locked once sent, with a fingerprint (a checksum or hash) so any later change is detectable. This is the same idea as the eIDAS requirement that changes be detectable.
• In what order? If the contract needs your signature after the customer’s, the process should enforce it.
• Can everyone keep a copy? A downloadable signed PDF and a completion certificate meet the retention requirement in ESIGN.

How e-signing works in Nextora

Nextora’s signing is a simple electronic signature process with a strong evidence trail; it does not issue advanced or qualified signatures. You upload a PDF or write the document, add signers, either from the CRM, so the document stays tied to their record, or typed in by hand, and place the fields. Find fields uses AI to locate blanks such as underlines, “Signature:” labels and tick boxes, work out whose each one is, and prefill what is already known.

Every recipient gets their own link and sees only their own fields; no account or password is needed. The signer draws their signature with a mouse, finger or stylus. Documents can use a sequential order, in which a signer cannot sign before the earlier participants have. Once sent, the document becomes read-only and its contents are verified by a checksum: if the checksum does not match, signing fails, so the client cannot sign something different from what you see. Cancelling a sending kills the links immediately, and links can carry an expiry date.

A signed document offers Download PDF and a Certificate: a sheet listing the signers, the signing times and the document’s fingerprint. The signing section shows every document’s state in one table, so you can see what is waiting and on whom. Contracts themselves can be produced from document templates filled from the deal, which keeps the numbers in the contract the same as the numbers in the CRM. That chain is covered in quote to cash for a small business, and the access controls around signed documents in CRM roles and permissions.

A short checklist before you send

1. Is the document on an exclusion list for the governing law? If it is a will, a family-law document or a regulated consumer notice, stop and get advice.
2. Does national law require a qualified signature for this document type? If so, use a qualified trust service provider.
3. Is each signer receiving their own link at an address you know is theirs?
4. Is the signing order right?
5. Will every party receive a copy they can keep?

For the quotes, order confirmations, service agreements and NDAs that make up most of a sales team’s paperwork, a simple electronic signature with a clean evidence trail is both legal and faster than paper. If you want to see how signing sits next to the deal and the documents, the CRM page is the place to start.

This article is general information about US federal law, the UETA framework and EU law as of October 2026. It is not legal advice. Rules differ by jurisdiction and document type; for a specific contract, check the governing law or ask a qualified lawyer.