Accounting Considerations in Cost Control
A beginner's guide to accounting considerations in cost control — why the cost a controls report shows rarely matches the accounting ledger, and how commitments, accruals, and timing differences must be understood to control cost correctly. Built on AACE International RP 108R-19.
What this lesson is about
Cost control and accounting both track project money, but for different ends: controls wants the earliest, most complete picture of cost to manage the project; accounting wants an accurate, auditable financial record. Those aims pull toward different numbers and different timing — and a good controller bridges the two rather than being confused by them.
How controls and accounting cost differ
| Cost control view | Accounting view | |
|---|---|---|
| Purpose | Manage and forecast the project | Record and audit the finances |
| Timing | As early as possible (commit/accrue) | When invoiced / paid |
| Includes | Commitments & accruals for work done | Recognized costs per accounting rules |
| Structure | By WBS / control account | By general-ledger accounts |
Commitments, accruals & cash
Three concepts explain most of the gap between the two views — and a controller must track all of them:
- Commitments — Money contractually obligated (e.g., a signed purchase order) but not yet invoiced. Real future cost, visible to controls long before accounting.
- Accruals — Cost for work done but not yet invoiced — recognized by controls (and period-end accounting) to match cost to the period it was incurred.
- Actuals / cash — Invoices received and paid — the accounting "actual." The most certain, but the latest to appear.
Using this knowledge
Build the cost report from committed + accrued + actual to get the earliest complete picture, understand where accounting's number will differ and why, and reconcile the two regularly so neither drifts unexplained. When controls and accounting disagree, the answer is usually timing — identify the commitments and accruals that bridge the gap rather than assuming one side is wrong.
Nine things to remember
- Controls cost and accounting cost differ — and both can be right.
- Different purposes, different numbers — manage the project vs record the finances.
- Controls leads, accounting lags — controls counts cost earlier.
- Commitments = contractually obligated, not yet invoiced — the forward view.
- Accruals = work done, not yet invoiced — matches cost to its period.
- Actuals/cash = invoiced and paid — most certain, latest to appear.
- Track commitments — the early warning the accounting ledger can't give.
- Build the report from committed + accrued + actual for the earliest complete picture.
- Reconcile regularly — explaining the gap is how controls earns its authority.
Glossary
- Accrual
- Cost for work done but not yet invoiced.
- Actual / cash cost
- Invoices received and paid.
- Cash vs accrual
- Recognizing cost when paid vs when incurred.
- Commitment
- Cost contractually obligated but not yet invoiced.
- General ledger
- The corporate accounting record of transactions.
- Purchase order
- A contractual commitment to buy.
- Reconciliation
- Explaining the difference between controls and accounting.
- Timing difference
- A gap caused by when cost is recognized.