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Stamp duty on an instrument is an ad valorem charge on the consideration or value, subject to a statutory cap for some instruments. Additional executed counterparts attract only a nominal duty each, and because stamp paper and e-stamp certificates are issued in fixed denominations the total is rounded up.
Duty on the principal instrument
Duty = Instrument value x Rate %, capped where a statutory maximum applies
Total stamp value
Total = Principal duty + Counterparts x nominal duty, rounded up to the nearest issuing denomination
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.
It is generally inadmissible in evidence until the deficit and a penalty are paid, which can be a multiple of the shortfall.
Usually not. Counterparts and duplicates attract a small nominal duty provided the principal instrument is fully stamped.