Period Treatment for Annual CAM Reconciliations
The CAM reconciliation hits the AP queue in March. The bill date is March 14, 2026. The period covered is January 1, 2025 through December 31, 2025. The amount is $7,800. The accountant has a decision to make, and the AP date is the wrong input.
CAM true-up accounting is one of the few entries on the GL where the right answer requires looking past the invoice date and reading what the bill actually covers. The wrong period treatment puts a 12-month operating expense in the wrong year and distorts every year-over-year comparison the client looks at after that. The right treatment is mechanical once the rule is set.
Period treatment: The accounting decision about which period an expense or revenue belongs in, driven by when the underlying obligation was incurred rather than when the invoice or payment posted. For CAM reconciliations, the period covered by the lease year governs the period of recognition, not the invoice date.
The decision rule in three lines
The expense belongs in the period covered. Not the period the invoice arrived. Not the period the payment cleared. The period the underlying lease year covered.
If the books for that period are open, post the entry as of the period close date with an accrued liability or as a direct expense if no estimate was previously accrued.
If the books for that period are closed, run the entry through current period as an adjustment to operating expense, with workpaper documentation of the period covered and the reasoning.
Three lines, two scenarios, one rule. The complexity is in the execution, not the principle.
Scenario walkthrough: books open
The retail client has a calendar lease year. The 2025 books are still open in early March 2026 because the firm''s close cycle runs through mid-March for the year-end financial package. The CAM reconciliation arrives March 8, 2026, with a true-up of $5,400 covering 2025.
If no accrual was previously booked for the expected true-up, the entry as of December 31, 2025:
| Account | Debit | Credit |
|---|---|---|
| Operating expense: CAM true-up | $5,400 | |
| Accrued occupancy liability | $5,400 |
When the actual payment clears in April 2026:
| Account | Debit | Credit |
|---|---|---|
| Accrued occupancy liability | $5,400 | |
| Cash | $5,400 |
If a year-end accrual of $4,800 was already booked based on prior reconciliation patterns, the unwind:
| Account | Debit | Credit |
|---|---|---|
| Accrued occupancy liability | $4,800 | |
| Operating expense: CAM true-up | $600 | |
| Accounts payable | $5,400 |
The $600 difference reflects the variance between the estimate and the actual, and it lands in the period the actual is known. The bulk of the expense ($4,800) sits in 2025 where it belongs.
Scenario walkthrough: books closed
Same client, same reconciliation, but the bill arrives May 2, 2026 and the 2025 books were locked April 1 after the financial package was issued.
The mechanical answer is current-period treatment as a prior-period adjustment to operating expense:
| Account | Debit | Credit |
|---|---|---|
| Operating expense: prior period CAM true-up | $5,400 | |
| Accounts payable | $5,400 |
The workpaper documents that the bill covers 2025, the books were closed, and the bill ran through current period due to closure. For most small and mid-sized businesses with non-audited financial statements, this is the right answer and no further action is needed.
For audited companies, the materiality threshold matters. If the $5,400 exceeds the auditor''s materiality, the conversation about whether to reopen 2025 is between the firm, the client, and the auditor. Most reconciliation amounts in the tenant context are below the auditor''s materiality threshold for the underlying engagement, but the conversation is worth having when the amount is unusually large.
"The period treatment is the bookkeeping question. The amount itself is a separate question. Both have to be right. A clean entry in the right period on top of an incorrect bill is half the answer. The detection layer catches the bill question; the close team catches the period question." — Angel Campa, Founder, CAMAudit
Estimating the year-end accrual
The year-end accrual is a judgment call based on prior reconciliation history. Three approaches, in order of preference:
Approach one: prior-year run rate. If the prior two reconciliations averaged 6.2 percent above estimate, apply 6.2 percent to the current-year monthly CAM estimates and accrue that amount. This is the cleanest method when the lease and the property have been stable.
Approach two: landlord-supplied estimate. Some landlords issue a preliminary reconciliation in late December or early January before the formal statement. If the preliminary number is available, use it. Confirm the methodology matches what produced the prior reconciliations.
Approach three: zero accrual with disclosure. When the lease is new or the prior history is too volatile to project, zero accrual with footnote disclosure that the reconciliation is pending is acceptable. Flag the amount as material when the actual arrives.
The tradeoff between approaches is materiality versus precision. For a $4,000 expected true-up on a $40 million revenue business, the precision of the accrual rarely matters. For a $40,000 expected true-up on a $4 million revenue business, getting close to right is worth the analysis.
The refund case
If the reconciliation produces a credit rather than a true-up, the period rule mirrors the charge case.
Books open: debit the accrued occupancy liability (if previously accrued) or credit current-period operating expense, credit accounts receivable for the refund due (or note the credit will be applied against future rent).
Books closed: credit current-period operating expense for the refund.
The watch-out on refunds is double-counting. If the landlord applies the credit to next month''s rent invoice rather than issuing a check, the AP team may post a smaller rent payment as a current-period expense reduction without recognizing that the underlying credit relates to the prior year. The fix is the same standard memo format on every occupancy bill, with the period covered always explicit.
ASC 842 considerations
For clients on ASC 842 lease accounting, the CAM true-up is a variable lease payment. ASC 842 specifies that variable lease payments not based on an index or rate are recognized in the period incurred. The period-matching treatment described above is consistent with the standard.
The right-of-use asset and lease liability calculations under ASC 842 exclude variable lease payments that are not based on an index or rate. CAM, taxes, and insurance pass-throughs typically fall into this category and do not affect the ROU asset measurement. They flow through operating expense in the period incurred, and the recognition pattern matches what cash-basis or accrual-basis accounting would produce for the variable component.
For clients new to ASC 842, this is one of the cleanest aspects of the standard: the variable lease payments behave the same as they did pre-842, and the standard simply codifies the period-matching treatment.
When to flag the bill itself for review
The period treatment article is about the journal entry. The detection question is separate: is the bill correct under the lease.
If the year-over-year true-up jumps significantly, a single category looks unusual, or the reconciliation includes line items the lease may not authorize, the firm''s job is to flag and escalate. CAMAudit''s estimated payment true-up detection rule catches the systematic issues; the close team catches the period treatment. Both layers run on the same document, and the workpaper covers both.
The integrated workflow is what makes a CAM-aware accounting practice valuable to commercial tenant clients. The close gets done correctly, the lease compliance question gets surfaced, and the client sees both layers of value from the same engagement.
Period treatment is the part of CAM accounting that does not require any CRE expertise. It requires bookkeeping discipline. Build the habit of checking the period covered before posting any CAM bill, and the year-over-year occupancy reports stop having the inexplicable jumps that come from period mismatches.