Three statutes govern this document, and a lender who understands all three is rarely caught out. The first is the Negotiable Instruments Act, 1881, whose Section 4 supplies the definition and whose later provisions decide how the note is presented, negotiated and enforced. The second is the Indian Contract Act, 1872: a note is still a contract, so Section 10 requires free consent, lawful consideration and competent parties, and Section 11 makes any note signed by a minor void. Consideration here is the money advanced, and it must be real, though the Act does not require it to be adequate.
The third, and the one that quietly sinks more cases than any other, is the Indian Stamp Act, 1899. A promissory note attracts stamp duty under the Act read with the State stamp schedules, and the rate varies by State. An insufficiently stamped or unstamped promissory note is inadmissible in evidence until the duty and the penalty are paid, which can be many times the original duty. Affix the correct stamp at the time of execution, in the State where the note is made. Banks treat this as non-negotiable, and so should you. The official text and schedule are set out in the Indian Stamp Act 1899 on the India Code portal, the government's authoritative legislative database.
Limitation is the final piece. Under the Limitation Act, 1963, a suit on a demand promissory note must be filed within three years from the date of the note, while a note payable at a fixed time runs three years from when that fixed time expires. Miss the window and the debt survives as a moral obligation but the remedy is gone. A written acknowledgment of the debt under Section 18 resets the clock, which is why prudent lenders obtain a signed acknowledgment before the three years lapse.