Estimate to Complete (ETC)

Estimate to Complete (ETC) is the contractor's projection of how much additional cost will be required to complete all remaining work on a contract from the current reporting date forward, a forward-looking metric that, when added to actual costs incurred to date, produces the Estimate at Completion (EAC).

What is Estimate to Complete?

ETC is calculated as: ETC = EAC (Estimate at Completion) minus ACWP (actual cost incurred to date). The EAC itself can be derived using multiple methods. The most common EVM-based formula is EAC = BAC / CPI, which uses the cumulative Cost Performance Index to project future performance based on the program's efficiency to date. An alternative is EAC = ACWP + ETC (bottom-up), where the contractor performs a detailed re-estimate of remaining work.

DoD and OMB require contractors on EVMS-applicable contracts to provide an independent ETC with each monthly Contractor Performance Report (CPR). The government uses the ETC to compare against its own Independent Cost Estimate (ICE) and to determine whether remaining contract funding is sufficient. A growing ETC gap between the contractor's projection and the government's ICE is an early warning sign of program financial health problems.

Contractors must be careful about ETC credibility. ETC that simply sets future CPI = 1.0 (assuming all future work will be performed perfectly, regardless of past performance) is generally not credible when the current CPI is significantly below 1.0. Government auditors will compare the contractor's ETC against EAC formulas based on cumulative performance data to identify whether the contractor's projection is realistic or artificially optimistic.

Why ETC matters for government contractors

ETC directly affects whether the government will fund a contract to completion or initiate a renegotiation. Contractors whose ETC grows faster than planned may face funding shortfalls, Limitation of Funds situations, and contract restructuring discussions. Accurate, defensible ETCs maintained throughout the contract lifecycle protect contractors from sudden adverse actions and demonstrate program management maturity.

Example

A federal IT modernization contractor is in month 18 of a 24-month, $50M contract. ACWP to date is $32M. The contractor's project team performs a bottom-up re-estimate of remaining work and concludes the remaining work will cost $22M. Therefore, ETC = $22M and EAC = $32M + $22M = $54M. The $4M overrun against the BAC ($50M) triggers a Limitation of Funds notification to the contracting officer and initiates discussions about whether additional funding or scope reduction is required to complete the program within budget.

Frequently Asked Questions

How does ETC differ from EAC?

ETC is the forward-looking cost to complete remaining work (starting from today). EAC is the total projected cost at contract completion, which equals actual cost already spent plus ETC. The formula: EAC = ACWP + ETC. Both metrics are required in EVMS reporting, but ETC is the actionable planning number that determines remaining funding needs.

What is the difference between a bottom-up ETC and a formula-based ETC?

A bottom-up ETC is developed by re-estimating each remaining work package in the Work Breakdown Structure, using current knowledge of what tasks remain and how long they will take. A formula-based ETC uses EVM metrics (like CPI) to project future performance statistically. Bottom-up ETCs are more rigorous but require significant contractor effort. Most EVMS contracts require bottom-up ETCs at least annually and whenever significant variances occur.

What triggers a mandatory ETC re-estimate?

Contracts typically specify variance thresholds that trigger mandatory ETC re-estimates: cost variances or schedule variances exceeding 10-15% of the budget at the WBS element or total contract level are common thresholds. Significant scope changes, technical problems discovered during testing, and major schedule slips also trigger re-estimates outside the normal reporting cycle.

Can a contractor change its ETC methodology during a program?

Changing ETC methodology mid-program requires contracting officer approval and must be justified by a documented change in circumstances (scope change, technical approach change, etc.). Changing ETC methodology purely to show a more favorable projection is a cost control integrity violation. DCAA audits look for methodology changes that coincide suspiciously with unfavorable EVM trend periods.