Definition
Overbilling (billings in excess of earnings) means you have billed the customer more than you have earned under your revenue recognition method (e.g., POC). It is a liability: you may have to “give back” revenue if the job goes bad or you must adjust. Underbilling (earnings in excess of billings) means you have earned more than you have billed—an asset and a collection opportunity.
Why It Matters
Large overbillings can signal aggressive billing or a job in trouble; sureties and lenders watch this. Underbillings tie up cash (you’ve done work but not billed it). Managing both keeps revenue and billing aligned and supports cash flow and bonding capacity.
Status at a glance
| Condition | Balance sheet classification | What it means operationally | Common causes |
|---|---|---|---|
| Overbilled | Liability (billings in excess of earnings) | You have billed ahead of revenue earned under your method—you still need to perform or recognize the work that “backs” what was billed. | Front-loaded SOV or pay apps, mobilization-heavy billing, deposits recognized in billing before earned revenue catches up. |
| Underbilled | Asset (earnings in excess of billings) | You have recognized more revenue than you have billed—cash and billings are lagging earned performance. | Slow applications, disputes or unapproved change orders delaying billing, administrative backlog. |
Front-loading and job borrowing
Front-loading is deliberately billing more than earned early in a job (often for mobilization cash). That creates overbilling until earned revenue catches up. It can be a planned cash tool but adds risk if the job underruns or costs spike—you already collected against work not yet earned.
Job borrowing is using cash from an overbilled job to cover another job’s costs or overruns. That can leave the first job short when earned revenue never catches up to cumulative billings, and it confuses true job-level performance.
Income statement context
WIP and POC reporting exist partly because billing timing alone distorts the income statement: overbilling can make results look stronger than underlying earned performance (money in before revenue recognized), while underbilling can hide earned profit (revenue recognized ahead of billings and collections). Align billings with earned revenue to read the job honestly.
Field Example
Job earned (POC) = $60,000; billed = $65,000. Overbilling = $5,000. On the balance sheet, “Billings in excess of cost and earnings” = $5,000 liability. Conversely, earned $70,000 and billed $65,000: underbilling = $5,000 asset (“Cost and earnings in excess of billings”). Next application should aim to bring billing in line with earned.
Same job, two billing positions: To date, revenue earned (POC) = $400,000. If cumulative billing = $450,000, you are overbilled by $50,000 (liability)—you billed ahead of earned. If instead cumulative billing = $330,000 on the same earned amount, you are underbilled by $70,000 (asset)—earned performance is ahead of what you have put on applications.
Calculation / Formula (if applicable)
Overbilling = Cumulative billing − Revenue earned (when billing > earned).
Underbilling = Revenue earned − Cumulative billing (when earned > billing).
Software Application
Compute from WIP: for each job, revenue earned (POC) and cumulative billing. Report overbillings and underbillings by job and in total. Show on WIP schedule and balance sheet. Alert when overbilling exceeds a threshold. Support billing recommendations (e.g., amount to bill to catch up).
Tooltip Version
Overbilling means you’ve billed more than you’ve earned (a liability); underbilling means you’ve earned more than you’ve billed (an asset and a chance to bill more).
Related Objects
Related: