In India, an 11-month rent agreement is generally considered valid and admissible in court, provided it's properly executed. Key requirements include using the correct stamp paper as per the state's Stamp Act and being signed by all parties involved. While notarisation is often recommended, it's not always mandatory. Registration is typically not required for agreements under 12 months, but paying the applicable stamp duty is essential for the document to be accepted as evidence, with provisions to pay back duty and penalties if initially omitted.