Understanding Bid Security Requirements for Multi-Lot RFTs
Introduction
Bid security is a standard requirement in many government procurement processes. When responding to multi-lot Requests for Tender (RFTs), vendors must understand how bid security applies. This guide explains the key principles, practical steps, and common pitfalls when submitting bids for multi-lot RFTs in compliance with North American public sector standards.
What is a Multi-Lot RFT?
Multi-lot RFTs are tenders divided into several distinct lots or packages. Each lot may represent a geographic area, a product group, or a project phase. Vendors can submit offers for one or more lots, depending on their capabilities. Multi-lot structures are common in large-scale procurement, allowing procurement authorities to increase competition and give smaller vendors opportunities.
- Example: A city releases an RFT for road maintenance services. Lot 1 covers the north end, Lot 2 the south, and Lot 3 the downtown area. Bidders may bid on one, some, or all lots.
Defining Bid Security in Government Procurement
Bid security is a financial guarantee ensuring that bidders will honor their bid commitments if awarded a contract. Generally, it takes the form of a bid bond, certified cheque, or irrevocable letter of credit. If the selected bidder fails to sign the contract or provide required performance security, the bid security may be forfeited.
- Protects procurement authorities against non-serious or speculative bids
- Encourages vendors to submit thoughtful, realistic bids
- Bid security requirements are typically stated in the tender documentation
Why Bid Security Matters for Multi-Lot RFTs
In multi-lot tenders, bid security requirements can increase in complexity. Authorities want to ensure coverage for all lots awarded. Vendors need to verify bid security values when bidding on multiple lots, as requirements may differ depending on the lot or combination of lots bid upon.
- Helps ensure only committed bidders participate in each lot
- Reduces administrative risk for authorities managing multiple contract awards
Types of Bid Security Accepted
Public sector RFTs generally specify acceptable types of bid security. The most common options include:
- Bid Bonds: Issued by a surety company; preferred due to ease of administration.
- Certified Cheques or Bank Drafts: Held by the authority until award.
- Irrevocable Letters of Credit: Issued by a recognized financial institution, allowing the authority to claim funds if needed.
Always check the RFT documentation for specific instructions or permitted forms of security.
Calculating Bid Security for Multi-Lot Bids
Authorities typically base the required bid security on the value of each lot, or the total value of all lots bid by the vendor. There are two common approaches:
- Per Lot Calculation: A percentage of each lot’s estimated value. Vendors must submit separate securities for each lot they bid.
- Total Coverage: A single security covering the highest value combination of lots the bidder could be awarded.
The correct approach and amount should be outlined in the RFT. If unclear, seek clarification before submission.
Sample Calculation
- Lot 1 estimated value: $100,000, Bid security: 5% ($5,000)
- Lot 2 estimated value: $80,000, Bid security: 5% ($4,000)
- If bidding both lots, the authority may require $9,000 (sum) or $5,000 (highest lot), depending on provisions.
Step-by-Step: Complying with Bid Security Requirements
- Carefully review the RFT documents: Identify all requirements, including forms, amounts, and deadlines.
- Determine which lots you wish to bid: List values and calculate total bid security needed based on the authorities’ instructions.
- Consult your surety provider or financial institution: Arrange for bid bonds or security documents. Request in the exact form and amount required.
- Check all documentation: Ensure names, amounts, and reference numbers match those in your bid submission.
- Submit the bid security as required: Include originals or copies, as directed, with your bid package.
Refer to the Bid Security Guide for more detailed procedural support.
Practical Example: Submitting Bid Security for Multiple Lots
Suppose your company wishes to bid on three lots in a municipal cleaning contract. The RFT states a 5% security is required for each lot, and a bidder can win any combination of lots for which they have submitted. You decide to bid on Lot 2 and Lot 3, with estimated values of $50,000 and $70,000 respectively.
- Lot 2: 5% x $50,000 = $2,500
- Lot 3: 5% x $70,000 = $3,500
If the RFT requires a separate security per lot, submit one for $2,500 and one for $3,500. If a combined security is permitted, submit $6,000 as a single bid bond or specified instrument.
Common Mistakes and How to Avoid Them
- Misreading RFT bid security instructions: Always confirm if the requirement is per lot or a combined amount.
- Submitting incorrect or incomplete documents: Ensure correct form, signatures, and bidder information before submission.
- Underestimating delivery timelines: Some banks and surety companies require lead time to prepare bid security paperwork.
- Lacking clarity on forfeiture conditions: Know under what circumstances bid security may be retained by the authority.
A full readiness checklist is available here: Vendor Readiness Checklist.
Key Takeaways for Vendors
- Multi-lot RFTs may require distinct or aggregated bid securities
- Understand the authority’s calculation method: per lot or total
- Submit in an accepted format (bid bond, certified cheque, or letter of credit)
- Double-check all documentation to avoid disqualification
- Ask procurement authorities to clarify unclear requirements
Compliance-Safe Next Steps
Preparing bid security for multi-lot RFTs requires attention to detail and careful document management. To stay compliant and ready for opportunities, register with PCANA to access up-to-date guidance, compliance tools, and procurement alerts across North America.





