It is generally not standard practice to issue a single Performance Bank Guarantee (PBG) with multiple validity dates and tiered amounts for different stages of a contract, as it creates ambiguity for the bank and the beneficiary during the invocation process.
Why this is generally avoided:
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Uniformity of Terms: A Bank Guarantee is an autonomous, independent contract. Banks prefer clear, unambiguous terms—specifically a single total amount and a single expiry date (plus a claim period).
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Operational Complexity: If a guarantee has "stepped" amounts and dates, it requires the bank to track complex conditions. If a dispute arises, it becomes unclear exactly how much can be claimed at which point, which defeats the purpose of an "unconditional" guarantee.
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Risk Management: Banks define their liability clearly. A variable-value/variable-validity structure complicates their internal risk monitoring and the "deemed" liability they carry on their books.
Recommended Alternatives:
If you need to cover both supply and installation with different timelines, consider these standard approaches:
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Two Separate Guarantees: The most straightforward and widely accepted method. You can issue a Supply PBG (valid until the supply is completed and accepted) and an Installation PBG (valid until the end of the installation/warranty period). This ensures no confusion over liability.
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One Guarantee with a Longer Validity: If the beneficiary allows, you could issue a single PBG for the total value (Rs. 120) that remains valid until the final deadline (31.10.2023). While this covers the entire period, the bank will charge commission on the full amount for the entire duration, which might be more expensive for you, but it is the most standard format for banks to process.
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Amendment Strategy: Issue a single PBG for the initial phase (Supply). Once the supply is successfully completed and accepted, request the beneficiary to release that guarantee and issue a new one for the installation phase, or amend the existing one if the bank agrees to such terms.
Practical Advice for Your Case:
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Consult Your Banker: Your bank will have a specific "template" or format for BGs. Most banks will reject a custom-drafted, multi-staged guarantee because it does not fit their standard systems (such as the SFMS—Structured Financial Messaging System used in India for secure bank communication).
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Clarify with the Beneficiary: Before approaching the bank, confirm if the beneficiary is willing to accept two separate guarantees. In most large tenders, this is actually preferred as it maps perfectly to the payment milestones.
Summary: While technically a contract could be written to include multiple stages, banks almost universally refuse to issue a single Bank Guarantee with "stepped" validity and amounts because it makes the guarantee's invocation complex and prone to legal disputes. It is highly recommended to split the guarantee into two separate documents—one for supply and one for installation—or use a single, unified guarantee that covers the entire period and total amount.