A seller points to a long list of jobs and says the next few months are already covered. Backlog can be a useful sign of demand, but it is not revenue in the bank. The number only helps when you know what is included, when the work can happen, and what it may cost to finish.

Start by asking the company what it means by backlog. Some businesses count signed customer orders. Others may also include awarded work waiting for a start date, approved changes to existing jobs, or other categories. Quotes and early conversations should be shown separately from customer orders.

The definition matters even at large public companies. Powell Industries' 2025 annual report describes its backlog as remaining work on firm orders, including some work that has not started. It excludes certain service agreements and says its method may not be comparable with other companies. It also cautions that orders can be changed or canceled. That is one company's reporting practice, not a benchmark for a smaller acquisition target.

Ask for the written definition and the report behind the headline number. Then pick several large items and trace them to the customer purchase order, signed agreement, or approved change. Check any conditions that still need to be met, along with the customer's rights to delay, reduce, or cancel the work. A signed order can still leave questions about timing and scope.

Put dates beside the work

A backlog total gives you no calendar by itself. Ask when each major job is expected to start, what must happen first, and when the company expects to finish and invoice it. Materials, staffing, customer access, permits, or approvals can all affect the schedule.

Look at how the list changed over time. Compare a prior backlog report with what was completed, postponed, reduced, or canceled. If management expects a large share to turn into sales during the coming year, ask for the job-by-job schedule behind that estimate and compare it with what happened in earlier periods.

This also helps separate work already ordered from new sales the forecast still needs to win. A quote or possible project can turn into real work, but until then it should not be counted as though the customer has placed the order.

Check what is left after delivery costs

The order value is not the profit. The company still has to supply the labor, materials, subcontractors, travel, and service time needed to complete the work. Ask what it expects to spend from today through completion, then compare that estimate with recent job results.

Pay attention to jobs that are running late or using more time and materials than planned. If the customer price is fixed, extra cost can reduce the profit that remains. If the business can pass some costs on, check what the contract actually allows and whether the customer has agreed to any change.

For a buyer, this is the difference between a full schedule and a sound forecast. The work has to be real, fit the company's capacity, and leave a margin that supports the earnings being underwritten.

Questions to settle before using backlog in a forecast

  • What exact documents qualify work for the backlog report?
  • Which items are signed orders, and which are awards, changes, or estimates?
  • What is scheduled to start and finish over the next year?
  • How much backlog was completed, delayed, reduced, or canceled in prior periods?
  • What labor and material costs remain on the largest jobs?
  • How much additional work must the business still win to meet its forecast?

Treat backlog as a work plan to test, not a revenue line to copy into next year's forecast. The useful question is what the customer has committed to, what the company can deliver on time, and what earnings the work can actually support.