Think of a promissory note (PN) as a written 'I promise to pay you' slip — something you'd give when borrowing money from a friend, a supplier, or a financier. It's one of the most commonly tested instruments in NI Act questions, so nail this definition cold.
A valid promissory note must tick five boxes: (1) It must be in writing — oral promises don't count. (2) It must contain an unconditional undertaking to pay — not a conditional promise. (3) The maker must sign it. (4) The amount must be certain — a fixed, determinable sum. (5) The payee must be a certain person — or 'to order' or 'to bearer'. One more thing: a bank-note or currency-note is explicitly excluded — the ₹500 note in your wallet is NOT a promissory note under this Act.
The word 'unconditional' is where most students slip up. If Rajesh writes 'I promise to pay Ms. Iyer ₹50,000 after my marriage' — that's conditional on an event (marriage) that may or may not happen. Not a valid PN. But 'I promise to pay Ms. Iyer ₹50,000 on 1st April 2026' — that's a fixed future date, certain to arrive, so it qualifies. Similarly, the amount must be fixed — 'I promise to pay ₹50,000 plus whatever else I owe you' is uncertain and fails the test. Also watch out for 'I O U' ('I owe you') notes — they are merely acknowledgements of debt, not a promise to pay, so they are NOT promissory notes. This is asked frequently as a 4-mark question in the form of 'which of these qualifies as a PN?' using the Act's own illustrations.
Example 1 — Identify the valid promissory note
Mr. Sharma writes four notes. Which qualify as promissory notes?
(i) "I promise to pay Mr. Kapoor or order ₹1,00,000."
(ii) "I acknowledge myself indebted to Mr. Kapoor for ₹75,000, to be paid on demand, for value received."
(iii) "Mr. Kapoor, I O U ₹50,000."
(iv) "I promise to pay Mr. Kapoor ₹80,000, first deducting any amount he owes me."
| Note | Reason | Valid PN? |
|------|--------|-----------|
| (i) | Unconditional promise, certain sum, certain payee, signed | Yes |
| (ii) | Acknowledgement of debt + promise to pay on demand = qualifies | Yes |
| (iii) | 'I O U' = mere acknowledgement, no promise to pay | No |
| (iv) | Amount is uncertain (deduction makes it variable) | No |
Final Answer: Notes (i) and (ii) are valid promissory notes.
---
Example 2 — Conditional vs. unconditional
Ms. Iyer signs: "I promise to pay Ravi ₹2,00,000 seven days after the sale of my flat in Pune."
Working:
- Is it in writing? Yes.
- Is it signed? Yes.
- Is the sum certain? Yes — ₹2,00,000.
- Is the promise unconditional? No — payment depends on whether the flat is actually sold. The event is uncertain.
Final Answer: This is NOT a promissory note. It fails the unconditional undertaking test.
📖 Bare Act text — Section 4, Negotiable Instruments Act 1881
(click to expand)
A "Promissory note" is an instrument in writing (not being a bank-note or a currency-note) containing an unconditional undertaking, signed by the maker, to pay a certain sum of money only to, or to the order of, a certain person, or to the bearer of the instrument. Illustrations: A Signs instruments in the following terms: (a) "I promise to pay B or order Rs. 500." (b) "I acknowledge myself to be indebted to B in Rs. 1,000, to be paid on demand, for value received." (c) "Mr. B, I O U Rs. 1,000." (d) "I promise to Pay B Rs. 500 and all other sums which shall be due to him." (e) "I promise to Pay B Rs. 500, first deducting thereout any money which he may owe me." (f) "I promise to Pay B Rs. 500 seven days after my marriage with C." (g) "I, promise to Pay B Rs. 500 on D's death, provided D leaves me enough to pay that sum." (h) "I promise to Pay B Rs. 500 and to deliver to him my black horse on 1st January next." The instruments respectively marked (a) and (b) are promissory notes. The instruments respectively marked (c), (d), (e), (f), (g) and (h)are not promissory notes.