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Course 168 · Money course 39

Value Inventory and Reconcile Cost of Goods Sold

Produce a fictional inventory-cost ledger with FIFO and weighted-average comparison, returns, write-down case and reconciled gross profit. Use complete original records and independently checked changed-input practice.

Before you start

Recommended preparation: Bookkeeping for Small Organizations.

Bookkeeping for Small Organizations See everything you’ll need

Free download · Original practice data · No external account required. Download the starter pack

What you’ll leave with

A fictional inventory-cost ledger with FIFO and weighted-average comparison, returns, write-down case and reconciled gross profit.

Start course Start without an account. Sign in to save lesson progress across devices.

Your project

Start with the practice files. Build your project one lesson at a time.

Practice files are free without an account. Sign in to save your project record in My Proof: a description, checklist, and optional work link. Keep the original files in your own app or notebook; saving a project record does not upload them.

  1. Get your materialsDownload practice filesSupplied practice cases, a blank working record, complete lesson instructions, and annotated worked examples.
  2. Make your projectView the project checklist Work in your own notebook, document, or software. Use the supplied practice examples when you prefer.
  3. Keep a private recordSave a project record Sign in to save a description and checklist, then return to update them.
Course handbook

Know the route before you begin.

Here’s what you’ll need and what you’ll make. You can return to this guide during any lesson.

Who this is for

Learners ages 14+ and adults studying future or current business decisions through fictional cases; no financial transaction is required.

Prepare before lesson one
  • Recommended preparation: Bookkeeping for Small Organizations.
  • Use paper or a local spreadsheet and calculator. Supplied records contain no real identities or accounts.
  • Preserve original financial files in your own tool; My Proof stores a project description, checklist and optional work link.
Your final project

Finish with proof you can use.

A fictional inventory-cost ledger with FIFO and weighted-average comparison, returns, write-down case and reconciled gross profit.

Save a project record in My Proof
See project checklist and review criteria

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.
Three ideas to help you along the way
Three useful ideas

The rules behind the steps.

01

Reconcile quantities first

Physical discrepancies need evidence.

02

State the cost method

Valuation is not proof of physical picking.

03

Trace loss separately

Condition and classification belong in the bridge.

What do these words mean?
Key words

Key terms worth knowing.

FIFO
Earliest acquisition costs assigned to sales first.
Periodic average
Total period acquisition cost divided by available units.
COGS
Costs assigned to sold goods, plus the explicitly stated case loss classification.
Landed cost
Acquisition cost including the named inbound cost.
NRV
Expected recoverable amount after relevant selling/disposal costs in the case.
Your route

6 lessons.
One useful project.

Work in order the first time. Each lesson makes something the next lesson can use.

  1. 1
    Up next

    Build a quantity and cost roll-forward

    Reconcile units available, units sold and counted ending units before cost assignment.

  2. 2
    16 min

    Assign FIFO costs

    Use earliest cost layers for periodic COGS and reconcile the remaining layers.

  3. 3
    16 min

    Compute periodic weighted-average costs

    Compute a whole-period average and use unrounded values for both sold and unsold costs.

  4. 4
    16 min

    Handle purchase returns and freight

    Revise retained units and landed cost before rerunning valuation.

  5. 5
    14 min

    Record a supported loss adjustment

    Apply the supplied net-realizable-value policy to damaged unsold stock with evidence.

  6. 6
    19 min

    Reconcile inventory, COGS and profit

    Produce a complete adjusted cost and gross-profit bridge under the stated method/policy.

Use the tools

Tools to help you practice.

See all tools
ZIP · practice files

Value Inventory and Reconcile Cost of Goods Sold practice files

Supplied practice cases, a blank working record, complete lesson instructions, and annotated worked examples.

Text worksheet

Your course project worksheet

A downloadable text worksheet with each lesson’s working output, space for your answers, and the shared final-project checklist. Save your own copy.

Source transparency

Sources and further study.

Explore the references behind the lessons and take your learning further. Source notes explain access and reuse.

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: Inventory cost-flow assumptions
Source & access notes · checked 2026-10-01

Read FIFO, weighted average, historical cost and lower-of-cost discussion; original quantities/costs/NRV policy supplied here.

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.

Ready when you are

Start with the first useful move.

You’ll always know what to do, what to make, and where to go next.

Start lesson one