Basis of Payment (BOP)

The Basis of Payment defines how you'll actually get paid on a government contract—and when those payments will flow. It's more than just a line item in your agreement. The payment method directly affects your pricing strategy, cash flow projections, and risk exposure throughout contract performance.

How It Works

According to PSPC's Supply Manual Chapter 4, the basis of payment should reflect the particular commodity and the duration of the contract. You'll encounter several standard structures: firm fixed price (you quote one price for the whole job), firm base price subject to economic price adjustment (built-in protection against inflation or currency shifts), fixed time rate (hourly or daily rates), progress payments (tied to deliverables), and advance payments (upfront funds for mobilization or materials).

Here's the thing: a single contract can use multiple pricing structures simultaneously. You might have firm fixed pricing for standard deliverables combined with time-and-materials rates for optional services. Construction contracts do this all the time—fixed pricing for base work with unit pricing for variable quantities and progress payments tied to completion milestones.

The timing matters as much as the method. For standing offers and supply arrangements, the Office of the Procurement Ombudsman notes that pricing basis can be fully defined at Stage 1 (when the standing offer is established) or only determined at Stage 2 (when individual call-ups are issued). This flexibility lets departments adapt payment terms to specific requirements that emerge over time.

Key Considerations

• Cash flow implications vary dramatically by payment method. Firm fixed price with payment on final delivery means you're financing the entire project. Progress payments or advance payments change that equation completely, but they come with additional reporting requirements and holdback provisions.

• Your risk exposure shifts with each structure. Cost-plus arrangements transfer risk to the Crown but require detailed cost tracking and lower profit margins. Fixed pricing puts performance risk on you but offers higher potential returns if you manage costs well.

• The Government Contracts Regulations apply regardless of payment method. Whether you're billing hourly or delivering against milestones, you're still subject to payment bond requirements on construction contracts and standard terms around labour and materials.

• Mix-and-match approaches require clear contract language. When multiple payment structures exist in one agreement, ambiguity about which applies to what deliverable creates payment disputes. Your Statement of Work needs to clearly map deliverables to their respective payment terms—no room for interpretation.

Related Terms

Contract Value, Payment Terms, Holdback, Progress Payment, Advance Payment

Sources

• Supply Manual - Chapter 4: Contract Approval and Administration

• Directive on the Management of Procurement

• Government Contracts Regulations (SOR/87-402)

Before you finalize your bid pricing, confirm which payment structure applies and model what it means for your working capital requirements. The lowest price isn't competitive if the payment terms put you out of business before project completion.