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Project Contingency and Margin Reference

Keep a cost contingency separate from revenue-based margin when converting a hypothetical $3,000 delivery estimate into a fixed project quote.

By PriceAndProfit Editorial Updated

The delivery estimate includes internal labor at cost and outside expenses. Contingency reserves additional delivery cost, while margin describes the profit share of the quoted fee. The two percentages use different bases. Adding them and applying the sum to the original estimate does not reproduce the quote shown here.

Cost budget = $3,000 × (1 + contingency); quote = cost budget ÷ (1 − target margin)
Hypothetical worked values; no market or statutory rates
Contingency on costDelivery budgetTarget margin on quoteQuoteProfit if full budget spent
0% $3,000 20% $3,750 $750
10% $3,300 20% $4,125 $825
20% $3,600 20% $4,500 $900
20% $3,600 25% $4,800 $1,200
20% $3,600 40% $6,000 $2,400

How to read and reuse this example

Choose the cost reserve from the uncertainty in the scope rather than copying a row. For example, additional discovery or another review round can increase expected delivery work. Once the reserve is included, divide the complete budget by the retained cost share. If actual delivery costs stay below that budget, the difference can improve final profit, but it is not guaranteed.

Boundaries and exceptions

The example assumes all quoted revenue is earned and collectible, and it excludes costs outside the stated project budget. A client billing rate that already contains overhead and profit should not be substituted for internal cost without explaining the resulting double count. A 100% target margin has no positive-cost price solution.

Method reference: OpenStax: Operating Budgets. Checked October 22, 2026. Capacity, sales and delivery-cost budgets; no market rate assumptions.

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