Stamp duty is a tax on instruments, not on transactions. It is charged under the Indian Stamp Act, 1899 and the corresponding State stamp legislation, and the rate depends on the nature of the document and the State in which it is executed. An instrument executed in India must ordinarily be stamped before or at the time of execution. An instrument that is not duly stamped is inadmissible in evidence under Section 35 of the Act, and may be impounded, though in most cases the defect can be cured by paying the deficient duty together with a penalty.
The practical point that catches people out is the last one. An unstamped agreement is not usually void. It is unusable, which in a dispute amounts to much the same thing until you pay to fix it.
What stamp duty is charged on
Section 3 makes instruments chargeable with duty at the rates in Schedule I. The word doing the work is instrument, which is defined broadly to cover any document by which a right or liability is created, transferred, limited, extended, extinguished or recorded.
Three consequences follow from that definition, and each one surprises somebody.
The tax attaches to the document, not the deal. An oral agreement attracts no stamp duty because there is no instrument. Reduce the same arrangement to writing and it becomes chargeable. This is not a reason to avoid writing things down, but it explains why duty is assessed on what the paper says rather than on what the parties intended.
Substance decides the classification, not the title. A document headed “Memorandum of Understanding” that in fact creates binding obligations to transfer property will be assessed as the instrument it actually is. The distinction between an MoU and a binding contract therefore has a fiscal consequence as well as a legal one.
One document, one duty, unless it covers distinct matters. Where a single instrument relates to several distinct matters, it is chargeable with the aggregate duty for each. Bundling unrelated arrangements into one agreement to save on stamp paper generally does not work.
Why the rate is different in every State
This is the source of most confusion, and it has a constitutional explanation.
Stamp duty is split between the Union and the States under the Seventh Schedule. The Centre prescribes rates for the instruments in the Union List, principally bills of exchange, promissory notes, bills of lading, letters of credit, policies of insurance, transfer of shares, debentures, proxies and receipts. The States prescribe rates for everything else, which includes conveyances, leases, mortgages, partnership deeds, powers of attorney and most commercial agreements.
Several States have also enacted their own stamp legislation rather than relying on the central Act as adapted. The result is that the Indian Stamp Act, 1899 supplies the substantive framework, definitions, machinery and consequences, while the number you actually pay comes from the State schedule.
For a drafter this means one habit is non-negotiable: never quote a rate from memory or from an article, including this one. Check the current schedule for the State of execution on the day of execution. Rates move with State budgets, and a figure that was right last year may not be right now.
When the instrument must be stamped
Timing is a separate requirement from amount, and missing it causes problems even where the correct duty is eventually paid.
Executed in India. An instrument chargeable with duty and executed in India must be stamped before or at the time of execution. Stamping afterwards is not the intended sequence, and it is what leads to impounding.
Executed outside India. An instrument executed outside India may be stamped within three months of its first receipt in India. This is the provision that matters when a non-resident client signs abroad, and the window is short enough that it is regularly missed. It applies as much to a power of attorney executed before a consular officer as to a commercial contract signed in another jurisdiction.
Practically, this means the stamp paper or e-stamp certificate should be purchased in the name of one of the parties, dated on or before the date of execution, and the instrument written on or attached to it.
How duty is paid
Four mechanisms are in use, and which are available depends on the State.
Physical stamp paper, purchased from a licensed vendor in the name of a party to the instrument. Still common, and still the source of avoidable defects when the stated purchaser is not a party.
e-Stamping, through the authorised central record keeping agency and its network. This is now the default in many States. The e-stamp certificate carries a unique identification number that can be verified online, which makes forgery considerably harder.
Franking, where an authorised bank or agent impresses the duty on the document before execution.
Adhesive stamps, used for lower value instruments, cancelled at the time of execution so that they cannot be reused. A stamp that is affixed but not cancelled is treated as unstamped, which is a technical trap worth remembering.
What happens to an unstamped or under-stamped document
This is the section that matters, because the consequence is not what most people assume.
It cannot be used in evidence. Under Section 35, an instrument chargeable with duty is not admissible in evidence for any purpose, and cannot be acted upon or registered, unless it is duly stamped. Every person having authority to receive evidence is bound to refuse it.
It can be impounded. Any person having authority to receive evidence, and every public officer before whom the instrument is produced in the performance of their functions, must impound an instrument that appears not to be duly stamped.
The defect is usually curable. The proviso to Section 35 allows most instruments to be admitted on payment of the deficient duty together with a penalty, which under the central Act can run to a substantial multiple of the duty. Separately, a person who produces an unstamped instrument before the Collector of their own motion within one year of execution, where the omission was occasioned by accident, mistake or urgent necessity, may be permitted to pay only the proper duty.
Executing an unstamped instrument is itself penalised. The Act provides penalties for executing an instrument chargeable with duty without it being duly stamped.
Arbitration agreements are a special case worth knowing. The consequence of non-stamping for arbitration agreements produced a long line of conflicting Supreme Court decisions. In December 2023 a seven judge bench held that non-stamping or insufficient stamping is a curable defect which renders an agreement inadmissible rather than void, and that objections on stamping are for the arbitral tribunal rather than the referral court. The practical effect is that an unstamped arbitration clause no longer stops the reference, though the duty still has to be paid.
Common instruments and how duty is generally structured
The amounts vary by State, so what follows is the structure rather than the rate.
| Instrument | How duty is usually structured |
|---|---|
| Sale deed or conveyance | Ad valorem on the consideration or the circle rate, whichever is higher. The largest cost in a property transaction |
| Agreement to sale | Often nominal, but several States charge a percentage and allow it to be adjusted against the sale deed. Where possession is delivered, some States treat it as a conveyance |
| Lease or leave and licence | Calculated on the rent for the term, sometimes with the deposit factored in |
| Gift deed | Ad valorem on market value, frequently at concessional rates for transfers to close relatives |
| Mortgage deed | On the secured amount, with different treatment for possessory and non-possessory mortgages |
| Partnership deed | Often a flat amount, sometimes linked to capital contribution |
| Power of attorney | Usually a modest fixed amount, but substantially higher where it authorises sale of immovable property |
| General commercial agreements | Commonly a modest fixed amount under the residuary agreement entry. Covers most service, vendor, NDA and employment agreements |
| Indemnity or guarantee bond | Fixed amount in most States |
| Share transfer | Central rate under the Union List |
Two entries in that table deserve a note. The rent agreement row is why the eleven month convention is about registration rather than duty, since the duty is calculated on the rent regardless of term. And the difference between an agreement to sale and a sale deed is the one that most often produces an unexpected bill, because early delivery of possession changes the classification.
What the drafter should actually do
Six habits that prevent almost all stamp duty problems.
State who bears the duty. Put it in the agreement expressly. It sits with the notices, governing law and severability provisions among the boilerplate clauses that get copied without thought, and silence produces an argument at the moment of execution when neither party wants to give ground.
Classify the document honestly before choosing the stamp. Ask what rights the instrument creates, not what it is called. This is the same discipline as the basic principles of legal drafting: the label follows the substance, which is equally true of the essential clauses every commercial contract must contain.
Check the State on the day. Both the State of execution and, where property is involved, the State where the property is situated.
Buy the stamp in the name of a party. An e-stamp certificate issued in the name of someone who is not a party to the instrument is a defect people discover years later.
Date the stamp on or before execution. Backdating a stamp certificate is not a fix, it is a separate problem.
Keep the certificate with the executed original. A missing certificate on a document you need to produce in court is functionally the same as never having stamped it.
Getting these wrong is squarely within the pattern of common mistakes made while drafting business contracts, where the damage comes from procedural omissions rather than from poorly worded clauses.
Stamp duty, registration and notarisation are three different things
They are routinely conflated, and the distinction is straightforward.
Stamp duty is a tax on the instrument. It makes the document usable in evidence.
Registration is the recording of the document in the public record under the Registration Act, 1908. It is compulsory for the instruments listed in Section 17, most importantly conveyances of immovable property and leases exceeding one year. Registration gives notice to the world and, for a sale deed, is what actually transfers title in a sale of immovable property under the Transfer of Property Act, 1882.
Notarisation is the attestation of execution by a notary. It evidences that the document was signed. It is neither a tax nor a public record, and it substitutes for neither.
A document can be stamped but unregistered, registered but insufficiently stamped, or notarised and neither. Each combination has different consequences, which is why these three questions should be answered separately for every instrument you draft, whether that is a partnership deed, a joint venture agreement or a builder buyer agreement under RERA.
Learning to get this right in practice
Stamp duty is the part of drafting that nobody teaches and everybody is expected to know. It rarely appears in a syllabus, it is not intellectually demanding, and getting it wrong makes an otherwise well drafted document unusable at exactly the moment it is needed.
The habit worth building is to treat stamping, registration and execution formalities as part of drafting rather than as administration that happens afterwards. That is a large part of what improving legal drafting skills means once you move from studying contracts to producing them, and it applies across the common types of legal document a junior lawyer is handed in their first year.
LawMento’s Practical Training in Drafting of Contracts works through execution formalities alongside the drafting itself, across 30 or more contract types, 26 hours of instruction and 230 pages of reading material. Where the work is property specific, the RERA and Real Estate Laws course covers the compliance framework these instruments sit inside.
Both build on the foundation set out in contract drafting as a discipline, where the recurring lesson is that a document is only as good as its weakest formality.
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Frequently asked questions
Is an agreement on plain paper valid in India?
As a contract, an agreement can be valid without stamp paper, since stamping is a fiscal requirement rather than a condition of contract formation. But an instrument chargeable with duty that is not duly stamped is inadmissible in evidence under Section 35, so you cannot enforce it in court until the duty and penalty are paid.
What is the stamp duty on a general agreement?
Most States charge a modest fixed amount under the residuary entry for agreements. The exact figure varies by State and changes periodically, so check the current State schedule rather than relying on a published number.
Can an unstamped agreement be enforced?
Not until the defect is cured. The instrument can usually be admitted after payment of the deficient duty plus a penalty, which is often a multiple of the duty. For arbitration agreements, the Supreme Court has held that non-stamping is curable and does not render the agreement void.
Who pays the stamp duty, the buyer or the seller?
It is a matter of contract. In property transactions it is conventionally the buyer, but the parties may allocate it differently, and the agreement should say so expressly.
Is e-stamp paper valid across India?
e-Stamping is available in most States but is administered State by State. An e-stamp certificate is issued for a specific State and the duty must correspond to that State’s schedule.
What is the validity period of stamp paper?
The central Act provides for refund of unused stamp paper within six months, which is often misunderstood as an expiry date for stamp paper already used. Stamp paper properly used for an instrument does not expire. The practical rule is that the stamp should be dated on or before execution.
Does stamp duty apply to an agreement executed electronically?
Yes. The definition of instrument is not confined to paper, and several States have made express provision for stamping electronic records. The mechanism varies, so check the position in the relevant State.
What happens if I discover an old agreement was never stamped?
It can be produced before the Collector, and where the omission was due to accident, mistake or urgent necessity and it is produced within a year of execution, only the proper duty may be payable. Beyond that, the usual route is payment of duty plus penalty when the document is produced in evidence.
This guide explains the general framework and is not legal advice for any specific transaction. Stamp duty rates, payment mechanisms and State legislation vary and change frequently. Verify the current position for the relevant State before executing any instrument.
