The Life Starter
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Course Library · Lesson 6 of 6
Money · Guided lesson

Reconcile inventory, COGS and profit

About 19 minutes · 4 reading + 15 practice and checks
Time includes reading, practice, and questions. Extra videos or further study are optional.
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A fictional inventory-cost ledger with FIFO and weighted-average comparison, returns, write-down case and reconciled gross profit.

Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.

What to include

  • A unit roll-forward and available-cost identity.
  • A FIFO layer worksheet and gross-profit bridge.
  • A periodic weighted-average comparison with FIFO and rounding notes.
  • A returned-purchase and landed-cost valuation ledger.
  • A supported damaged-inventory value adjustment and quantity/value bridge.
  • A final inventory-cost and gross-profit reconciliation packet.

Review and revise

Use these criteria to check your work and choose what to improve.

  • Units: acquisitions, returns, sales and count reconcile.
  • Valuation: FIFO and average use correct layers/pool.
  • Loss: supported affected-unit adjustment is explicit.
  • Profit: cost destinations and classification reconcile.
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Before you begin

The idea in everyday life

Original fictional practice. All money is USD. No account, payment, personal record or outside participation is required. Fictional periodic inventory of identical notebooks: beginning 10 units at 4=40; buy 20 at 5=100; sell 18 at 10=180 revenue. Initial count 12 remain. Later variation: return 4 purchase units before any sales and pay 16 inbound freight allocated only to the 16 retained purchased units. Adjusted goods available 26 units/cost 136; sell 18, ending count 8. For the loss case use FIFO, of the eight unsold units two are damaged, cost 6 each and supported net realizable value 1 each. Exercise policy records the 10 loss within COGS; no tax policy or real standard election is implied. Original changed-case support labels: RET-04 documents the four-unit supplier return before sales; FRT-16 allocates freight 16 to the retained purchase lot; LOSS-02 documents two ending units at cost 6 each and recoverable value 1 each. These are supplied fictional source labels for your audit index.

The idea

Every available acquisition dollar must have an explained destination.

Follow along

Reconcile inventory, COGS and profit — complete worked case

Every available acquisition dollar must have an explained destination.

Fictional periodic inventory of identical notebooks: beginning 10 units at 4=40; buy 20 at 5=100; sell 18 at 10=180 revenue. Initial count 12 remain. Later variation: return 4 purchase units before any sales and pay 16 inbound freight allocated only to the 16 retained purchased units. Adjusted goods available 26 units/cost 136; sell 18, ending count 8. For the loss case use FIFO, of the eight unsold units two are damaged, cost 6 each and supported net realizable value 1 each. Exercise policy records the 10 loss within COGS; no tax policy or real standard election is implied. Original changed-case support labels: RET-04 documents the four-unit supplier return before sales; FRT-16 allocates freight 16 to the retained purchase lot; LOSS-02 documents two ending units at cost 6 each and recoverable value 1 each. These are supplied fictional source labels for your audit index.

Initial original ledger

Paste at A1.

ARecordBUnitsCUnit costDCost or revenue
Beginning10440
Purchase205100
Sale18Selling 10180
Initial closing count12UnassignedTo calculate

Copy as plain text
  1. 1. 6.1 Reconcile

    Combine quantity, returns/freight, FIFO allocation and loss schedules with matching record IDs.

    You should see: 26 available,18 sold,8 held;136 available cost.

  2. 2. 6.2 Reconcile

    Reconcile 98 COGS including loss plus 38 ending against 136 available cost.

    You should see: No unexplained acquisition dollar remains.

  3. 3. 6.3 Reconcile

    Bridge 180 revenue to 82 gross profit and label the chosen loss classification.

    You should see: The loss reduces gross profit under this stated policy.

  4. 4. 6.4 Reconcile

    Write one error check: overstating ending by 5 would understate COGS 5 and overstate profit 5 if the pool stays 136.

    You should see: Inventory and profit errors move together under the identity.

Now change one thing

A new statement reports revenue 200 and case-defined cost of goods sold including losses of 98. Enter gross profit.

Your work

What to finish

A final inventory-cost and gross-profit reconciliation packet.

Common mistake

Watch for this

Calling the revenue balance a profit balance or concealing the loss classification.

How can I tell I understand it?

Verify that your completed final inventory-cost and gross-profit reconciliation packet meets the three lesson-specific checks and retains the supporting original records.

Try 3 questions

Quick knowledge check

Answer all 3 questions. Get at least 2 right and the lesson completes automatically.

Not yet passed

You’ll get an explanation for each answer. Signed in? Your results save to your account.

1Final available 136 and ending 38 imply which case COGS?
2Ending inventory is overstated 5 while available cost is fixed. What follows from the identity?
3Which final note permits a fair profit comparison?
0 of 3 answeredApply the lesson to a short question, then review the explanation.
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.

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Sources and further reading

Explore the references behind this lesson.

Open Stax: Inventory errors and statement effects
Source & access notes · checked 2026-10-01

Read dynamic inventory/COGS relationship and available-for-sale boundary. Distinct loss classification is stated as a fictional exercise policy.

Access: Public primary page body opened and relevant sections read through the web reader on 2026-10-01; no account required for reading.

Reuse: Original Life Starter cases, datasets and questions; no source exercise or worked dataset reproduced. Links support further reading.

Open Stax: Periodic inventory and COGS
Source & access notes · checked 2026-10-01

Read periodic whole-period average and cost allocation mechanics; all original practice uses this explicitly named periodic method.

Access: Public primary page body opened and relevant sections read through the web reader on 2026-10-01; no account required for reading.

Reuse: Original Life Starter cases, datasets and questions; no source exercise or worked dataset reproduced. Links support further reading.

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