Period close in Business Central: the sequence that takes days, not weeks

Why period close drags on

Short answer: not the volume of work, but the order of it. Close consists of procedures that depend on each other. Calculate the financial result before adjusting inventory cost and you will be recalculating everything a second time.

Companies that close in two days rather than two weeks are not doing anything clever. They have a fixed sequence and a checklist before each step. What follows is that sequence.

The close sequence: seven steps

Step	What happens	Why here and not elsewhere
1. Source documents	Every document of the period posted, no drafts left	One unposted document corrupts every calculation after it
2. Bank reconciliation	Statements imported and matched	Unmatched payments distort receivables and payables
3. Currency revaluation	Revalue foreign currency balances and open entries	Must precede the result calculation
4. Inventory cost	Adjust cost of item entries, allocate item charges	The heaviest step: it changes cost of goods sold retroactively
5. Depreciation	Post depreciation across all books	Period expense must be complete first
6. Financial result	Close income and expense accounts	Only valid after steps 3–5
7. Lock the period	Restrict posting dates	So nobody edits data after the statements are filed

Step four is the one most often skipped. If cost adjustment is configured but never run on a schedule, inventory value and cost of goods sold live in separate realities, and the gap compounds month after month until somebody finally reconciles a stock count.

Costing method: chosen once, lived with forever

The costing method is set per item and is effectively impossible to change retroactively, because it governs how existing entries were valued. That makes it a design decision, not something to revisit during configuration.

Method	Suits	Risk
FIFO	Perishables, distribution	Requires discipline in document chronology
Average	Homogeneous stock, raw materials	Late documents distort the average
Specific	When the individual lot matters	Most precise, but every document must carry lot information
Standard	Manufacturing with predictable costs	Needs regular revision of standards and variance analysis

A practical test before the first close in a new system: run cost adjustment against last month's data in a sandbox and compare the result with what the old system reported. The difference shows exactly where configuration does not match how goods actually move.

Currency revaluation and import costs

Revaluation covers foreign currency bank balances and outstanding customer and vendor entries. Sequence matters here too: apply payments to invoices first, revalue second. Otherwise the system revalues debt that has already been settled.

Import operations add a separate concern. Customs value, duty and other acquisition costs belong in the item's cost, not in period expense. Post them as item charges and they land where they should. Post them as an expense and margin on imported lines will read high — sometimes for years before anyone questions it.

Control reports before signing off

• Trial balance. No unusual balances sitting on clearing or suspense accounts.
• Account analysis on key accounts. A breakdown of any figure that raises a question.
• Aged receivables and payables. Balances by customer and vendor, matched against expectation.
• Inventory valuation against quantity. Value and units agree with the warehouse.
• Gross margin by item group. The simplest test that exists.

That last one deserves emphasis. If margin on a product group suddenly looks atypical, the cause is almost always cost adjustment that was never run, or documents posted with a back-date after the fact. It takes thirty seconds to check and catches errors that a trial balance will happily hide, because a wrong cost still balances.

Why locking the period is not bureaucracy

After the statements are filed, the period is closed to changes. Two settings do this: allowed posting dates at company level, and per-user posting periods for people who need a narrower window.

Without locking, any correction posted "into last month" silently rewrites reporting that has already been submitted. The report you produced yesterday shows different numbers today, and nobody can say why. Once that happens twice, finance stops trusting the system and goes back to keeping its own spreadsheet — which is the real cost of skipping this step.

A workable convention: lock immediately after sign-off, and require a named approver to reopen. Corrections then arrive as documents in the current period, where they belong, rather than as invisible edits to a closed one.

Shortening period close is a common goal of our projects.

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