1) Section10A of the Information Technology Act, 2000 validates electronic contracts and e-signatures,

2) Section 35 of the Indian Stamp Act, 1899 explicitly bars courts from admitting any unstamped or under-stamped document into evidence. This makes paying the required stamp duty mandatory for actual legal enforceability

3) You must pay the stamp duty. You can clear the defect later by paying a penalty (which can reach up to 10 times the original shortfall), but the agreement will not be enforceable until that penalty is resolved

4) Only the principal document needs to bear the primary stamp duty. In your setup, you should choose one state (e.g., Delhi, where your company might be headquartered) to serve as the location of the primary execution. 

5) The other copies are legally viewed as "counterparts" or "duplicates." Under state laws (such as Article 24 of the Maharashtra Stamp Act), duplicates only require a nominal rate (often a flat ₹100 or a minimal fixed fee) provided the stamp certificate notes the certificate number of the fully stamped Delhi principal copy.

Executing agreements completely paperless across multiple states in India is  legally recognized, but navigating the intersection of electronic signatures and state stamp acts requires precision. Under Section 10A of the Information Technology (IT) Act, 2000, electronic contracts are legally valid and cannot be denied enforceability solely because they were executed digitally. While your Aadhaar-based e-signature makes the NDA valid, Section 35 of the Indian Stamp Act, 1899 dictates that any instrument not "duly stamped" is inadmissible as evidence in a court of law.  If a future cofounder or employee breaches the NDA and leaks your prototype, you cannot use that unstamped e-document to secure an injunction or damages in court without first paying the deficient stamp duty along with a hefty penalty of up to 10 times the original duty. Therefore, stamping is practically mandatory for  legal protection.

Since your company is pre-incorporation and you (the Disclosing Party) are located in Delhi, while the Recipient signers are executing from Maharashtra and Karnataka, this is considered an inter-state transaction.

You do not need three different state stamp papers for one agreement. Instead, you follow the rule of the highest stamp duty among the executing states. 

You may go for a digital e-Stamp paper for the highest common value—typically ₹500 under the Delhi jurisdiction or the state where the primary obligation rests (your location as the owner of the IP). Stamping it at the highest rate prevents any party from claiming the document is "insufficiently stamped" under their respective state's laws if litigation arises locally.

Dear Sir/Madam,

An NDA can be legally executed electronically. However, an e-signature does not replace applicable stamp duty; an insufficiently stamped NDA may be impounded and ordinarily cannot be relied upon in court until the deficit duty and penalty are paid.

Stamp duty applies to each NDA according to the State where it is first executed. If it is later received or acted upon in Maharashtra or Karnataka, differential duty may be payable there if the local rate is higher; therefore, Delhi stamping for all NDAs is not automatically sufficient.

Prepare a separate NDA for each person, specify its place of execution, obtain the appropriate State e-stamp before signing, and execute it through Aadhaar eSign/DSC with a proper timestamp and audit trail. Confirm the exact stamp article and rate with the concerned State stamp authority before execution.

Advocate Saurabh Agrawal

An electronically executed Non-Disclosure Agreement (NDA) is generally valid and enforceable in India, provided it satisfies the requirements of the Information Technology Act, 2000 and the Indian Contract Act, 1872. An NDA is a contractual document, and there is no legal requirement that it must be physically signed merely because it is executed electronically. An electronic signature, such as an Aadhaar e-Sign or a Digital Signature Certificate (DSC), is legally recognised and is capable of creating a binding and enforceable contract.

However, it is important to distinguish between execution and stamping. While an e-signature is sufficient to establish a valid agreement between the parties, stamping is a separate requirement governed by the applicable State Stamp Act. Depending on the nature of the NDA and the relevant State law, the agreement may attract nominal stamp duty. Although an unstamped or insufficiently stamped NDA is not necessarily void, it may face objections when produced as evidence before a court, and the deficient stamp duty together with any applicable penalty may have to be paid before the document is admitted in evidence. Therefore, as a matter of prudence, it is advisable to ensure that the NDA is duly stamped.

With regard to the applicable stamp duty, the governing principle is generally the place where the instrument is first executed or the provisions of the applicable State Stamp Act. Since you are based in Delhi and are the disclosing party, if the agreement records Delhi as the place of execution, provides that it is governed by Delhi law, and confers jurisdiction upon the courts at Delhi, the applicable stamp duty under the Delhi Stamp Act would ordinarily apply. The fact that the recipients are situated in Maharashtra and Karnataka does not automatically require separate stamping under the laws of those States merely because they execute the document electronically from their respective locations.

The recommended process would be to first finalise the NDA with appropriate clauses specifying Delhi as the governing law and conferring exclusive jurisdiction upon the courts at Delhi. Thereafter, obtain the appropriate e-stamp under the Delhi Stamp Act, incorporate the e-stamp certificate into the final version of the agreement, and have all parties execute the same electronically using Aadhaar e-Sign or a valid Digital Signature Certificate. The final electronically signed agreement, together with the e-stamp certificate, execution logs, email trail, and any audit trail generated by the e-sign platform, should be safely preserved as evidence of execution.

Since you are in the process of onboarding a technical co-founder and employees for a technology startup, it is also important to note that an NDA alone may not adequately protect your intellectual property. In addition to the NDA, you should execute a comprehensive Founders' Agreement and an Intellectual Property Assignment Agreement to ensure that all source code, software, inventions, designs, confidential information, and other intellectual property created by the co-founder or employees vest in, or stand assigned to, the company upon its incorporation. This provides significantly stronger legal protection than an NDA alone.

Accordingly, while a digitally executed NDA is legally valid, it is advisable to ensure that it is appropriately stamped and supplemented by proper IP assignment documentation to comprehensively safeguard your startup's intellectual property and confidential information.

No if it’s digitally signed then you don’t need stamping