Backlog is a company-defined measure of orders, contracted work, or other future activity that has not yet been recognized as revenue.
It is common in construction, aerospace, industrials, software, services, and other businesses where signed work can extend across reporting periods.
Backlog is not a standardized GAAP measure
There is no universal GAAP definition of backlog.
One issuer may include only enforceable signed contracts. Another may include purchase orders, funded contract value, signed agreements that have not started, or even letters of intent under its operating definition.
That makes backlog useful for understanding one company's future workload, but often dangerous to compare mechanically across companies.
Backlog is not guaranteed future revenue
A $1 billion backlog does not guarantee $1 billion of future revenue.
Customers can cancel or modify work, projects can be delayed, scope can change, pricing can be adjusted, and the company still has to perform. Some backlog may also extend over many years.
Investors should therefore examine cancellation rights, expected conversion timing, and historical conversion rather than treating backlog as cash already earned.
Backlog versus remaining performance obligations
Remaining Performance Obligations are rooted in ASC 606 transaction price allocated to unsatisfied or partially unsatisfied performance obligations.
Backlog is broader or narrower depending on the issuer's definition. IES, for example, states that its backlog can include signed agreements and letters of intent that are excluded from RPO until the company has an enforceable right under the accounting analysis.
Other companies can define backlog and RPO nearly identically for a particular segment.
Backlog versus bookings
Bookings usually describe contract activity added during a period. Backlog is usually a point-in-time stock of remaining work.
A simplified bridge might resemble:
Ending backlog ≈ beginning backlog + new bookings - revenue recognized - cancellations or adjustments
But that is an analytical bridge, not a universal accounting equation. Issuer scope and definitions can make the actual movement more complicated.
Backlog quality matters
Two companies can report the same backlog but have very different economics.
Near-term, funded, non-cancelable work can provide more visibility than long-duration or easily terminable commitments. Margin, customer concentration, inflation exposure, and execution risk also determine whether backlog ultimately creates attractive profit.
Investor interpretation
Check what qualifies for backlog, whether commitments are enforceable or cancelable, expected conversion timing, funded versus unfunded status where relevant, acquisitions, currency, and whether management changed the definition. Do not infer a precise revenue forecast from the headline balance alone.
Sources
- IES Holdings 2025 Form 10-K, backlog and RPO definitions
- IES Holdings fiscal 2026 disclosure, backlog versus enforceable RPO
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