Strategic Cost Management · Back Flush Accounting

Backflush Accounting Journal Entries and Numerical Problems

Updated 11 October 2026 · Fact-checked

Backflush accounting records costs only at trigger points, such as purchase of materials, completion of goods or sale, and works backward using standard cost. To solve a problem, identify the trigger points, post entries at standard cost, credit Conversion Cost Allocated, then close any under or over-applied conversion cost to Cost of Goods Sold.

Understand Journal Entries and Numerical Problems in Backflush

In a normal costing system you track cost step by step through material, work-in-process and finished goods. Backflush accounting skips most of these steps. It is used where production is fast and stocks are small, as in a JIT set-up. It records cost only at chosen points and works backward to assign standard cost to the output.

A trigger point is the event that makes you pass an entry. Common triggers are purchase of direct materials, completion of finished goods and sale of goods. The fewer the triggers, the fewer the accounts. The question always tells you the trigger points. Do not assume them.

Two accounts are special. Raw and In-Process (RIP) Inventory combines raw material and work-in-process in one account. Conversion Cost Control collects actual labour and overhead costs (the debit side). Conversion Cost Allocated is the credit side. It records the standard conversion cost charged to output.

The actual conversion cost rarely equals the allocated amount. The difference is under-applied (actual is more than allocated) or over-applied (actual is less than allocated). At period end you close both accounts. Usually the difference goes to Cost of Goods Sold. It may be prorated if the amount is material and the question says so.

Key rules to remember

Standard cost per unit: Standard cost per unit = Standard material cost + Standard conversion cost; Finished goods and cost of goods sold are both recorded at this amount in backflush entries.
Conversion cost allocated: Conversion Cost Allocated = Units (completed or sold, per trigger) × Standard conversion cost per unit; Use the units at the trigger point named in the question. Do not use units started.
Under or over-applied conversion cost: Difference = Conversion Cost Control (actual) − Conversion Cost Allocated; Positive means under-applied: debit COGS. Negative means over-applied: credit COGS.
Closing RIP Inventory: Closing RIP = Materials purchased (plus opening RIP) − Standard material cost of units transferred to finished goods; Valid when materials are debited to RIP at standard cost. Actual-price purchases lead to a price variance, and the question will say how to treat it.
Adjusted cost of goods sold: Adjusted COGS = Standard cost of units sold + Under-applied (or − Over-applied) conversion cost; This is the figure you report in the income statement.
Standard entry at completion trigger: Dr Finished Goods; Cr RIP Inventory (standard material); Cr Conversion Cost Allocated (standard conversion); This single entry is the heart of the common two-trigger backflush system.

How to solve Journal Entries and Numerical Problems in Backflush questions

Use this order for any backflush journal or ledger question. It keeps you from missing an entry or a closing adjustment.

1Read the question and list the trigger points. Note whether it uses RIP Inventory, Finished Goods or neither.
2Work out the standard cost per unit, split into material and conversion.
3Pass the first trigger entry. For purchase of materials, debit RIP Inventory (or the stated account) and credit Accounts Payable.
4Record actual conversion costs: debit Conversion Cost Control and credit Wages Payable, Overheads or Cash as given.
5Pass the completion entry: debit Finished Goods at standard cost, credit RIP Inventory for material and credit Conversion Cost Allocated for conversion.
6Pass the sale entry: debit Cost of Goods Sold and credit Finished Goods for units sold × standard cost.
7Close the conversion accounts: debit Conversion Cost Allocated and credit Conversion Cost Control. Transfer the balance (under-applied to debit COGS, over-applied to credit COGS).
8Post to ledger accounts if asked, and check that closing RIP + closing FG + adjusted COGS = total costs put in.

Quickest way: Three-line check method

When to use it: Use when time is short, such as a 14-mark question with several parts, or when you only need the final balances.

Compute each balance directly: closing RIP = purchases − standard material of units completed; closing FG = (produced − sold) × standard cost; standard COGS = units sold × standard cost.
Compute the conversion difference = actual conversion cost − (units at trigger × standard conversion rate), and add it to COGS if under-applied.
Verify: closing RIP + closing FG + adjusted COGS must equal purchases + actual conversion cost. Then write the journal entries from these figures.

Common mistakes in Journal Entries and Numerical Problems in Backflush

Using units started or sold instead of units at the trigger point to compute Conversion Cost Allocated.
Students apply the same unit count to every entry out of habit.
Fix: Underline the trigger point in the question. If it is completion, allocate on units completed. If it is sale, allocate on units sold.
Debiting Conversion Cost Control with the allocated amount, or crediting it with actual costs.
The names Control and Allocated look alike, so the sides get mixed.
Fix: Remember: actual costs are debited to Control. Allocated is credited when output is recorded. At closing, debit Allocated and credit Control.
Treating under-applied cost as a credit to COGS.
Students confuse the sign of the difference.
Fix: If actual exceeds allocated, cost was not absorbed, so COGS goes up. Under-applied means debit COGS. Over-applied means credit COGS.
Leaving out the unsold units when computing closing finished goods.
The sale entry is passed but the finished goods balance is never worked out.
Fix: Closing FG = (opening + units completed − units sold) × standard cost. Always show the FG ledger.
Passing a work-in-process entry that backflush skips.
Students carry over the steps of traditional costing.
Fix: In backflush there is no separate material or WIP entry when the question gives RIP or no inventory. Pass only the entries at the stated trigger points.
Forgetting that the closing RIP balance is not zero when materials purchased exceed materials used.
Students assume all purchased material is consumed.
Fix: Subtract the standard material cost of completed units from purchases. The balance is RIP stock. It is shown as an asset.

Worked examples

Example 1

Sundaram Auto Parts Ltd uses backflush costing with two trigger points: purchase of direct materials and completion of finished goods. There are no opening stocks. Standard cost per unit is ₹800: material ₹500 and conversion ₹300. During the month, materials purchased (recorded in RIP Inventory at standard cost) were ₹51,00,000 and actual conversion costs were ₹31,00,000. The company completed 10,000 units and sold 9,000 units. Pass the journal entries, find closing balances, and dispose of the under or over-applied conversion cost by transferring it to COGS.

Show the solution

Entry 1, purchase of materials: Dr RIP Inventory ₹51,00,000; Cr Accounts Payable ₹51,00,000.
Entry 2, actual conversion costs: Dr Conversion Cost Control ₹31,00,000; Cr Wages Payable, Overheads and other accounts ₹31,00,000.
Entry 3, completion of 10,000 units at ₹800 = ₹80,00,000: Dr Finished Goods ₹80,00,000; Cr RIP Inventory ₹50,00,000 (10,000 × ₹500); Cr Conversion Cost Allocated ₹30,00,000 (10,000 × ₹300).
Entry 4, sale of 9,000 units at ₹800 = ₹72,00,000: Dr Cost of Goods Sold ₹72,00,000; Cr Finished Goods ₹72,00,000.
Closing accounts: Conversion Cost Control debit ₹31,00,000 less Conversion Cost Allocated credit ₹30,00,000 gives ₹1,00,000 under-applied. Entry 5: Dr Conversion Cost Allocated ₹30,00,000; Dr Cost of Goods Sold ₹1,00,000; Cr Conversion Cost Control ₹31,00,000.
Balances: closing RIP = ₹51,00,000 − ₹50,00,000 = ₹1,00,000. Closing FG = 1,000 units × ₹800 = ₹8,00,000. Adjusted COGS = ₹72,00,000 + ₹1,00,000 = ₹73,00,000.
Check: ₹1,00,000 + ₹8,00,000 + ₹73,00,000 = ₹82,00,000, which equals ₹51,00,000 + ₹31,00,000.

Answer: Conversion cost under-applied is ₹1,00,000, debited to COGS. Closing RIP Inventory is ₹1,00,000, closing Finished Goods is ₹8,00,000 and adjusted COGS is ₹73,00,000.

Example 2

Kaveri Appliances Pvt Ltd uses a backflush system with a single trigger point: sale of finished goods. No RIP or Finished Goods accounts are kept. Standard cost per unit is ₹200: material ₹120 and conversion ₹80. In a month, 8,000 units were sold. Actual conversion costs were ₹6,90,000. Pass the journal entries and find the cost of goods sold after adjusting the conversion cost difference.

Show the solution

Entry at sale: units sold 8,000 × ₹200 = ₹16,00,000. Material = 8,000 × ₹120 = ₹9,60,000. Conversion = 8,000 × ₹80 = ₹6,40,000. Dr Cost of Goods Sold ₹16,00,000; Cr Accounts Payable (material) ₹9,60,000; Cr Conversion Cost Allocated ₹6,40,000.
Entry for actual conversion costs: Dr Conversion Cost Control ₹6,90,000; Cr Wages Payable, Overheads and other accounts ₹6,90,000.
Difference: actual ₹6,90,000 − allocated ₹6,40,000 = ₹50,000 under-applied.
Closing entry: Dr Conversion Cost Allocated ₹6,40,000; Dr Cost of Goods Sold ₹50,000; Cr Conversion Cost Control ₹6,90,000.
Adjusted COGS = ₹16,00,000 + ₹50,000 = ₹16,50,000.
Note: because cost is recorded only on sale, units made but unsold are not shown as inventory in these books. That is the main limitation of this variation.

Answer: Standard COGS is ₹16,00,000. Under-applied conversion cost of ₹50,000 is debited to COGS, so adjusted COGS is ₹16,50,000.

Exam tips

Write the trigger points at the top of your answer. Examiners award marks for choosing the right entries, and a wrong trigger spoils every later figure.
Show each journal entry with a one-line narration and the working in brackets, for example (10,000 × ₹300). Part marks depend on visible workings.
In MCQs, test the sign. Actual above allocated means under-applied and an increase in COGS. Check this before choosing an option.
If a ledger is asked, draw RIP, Finished Goods, Conversion Cost Control, Conversion Cost Allocated and COGS accounts. Balance each one and run the total check.
State any assumption, such as no opening stock or materials purchased at standard cost, if the question is silent. A one-line assumption protects your marks.

Practice questions from Back Flush Accounting

Journal Entries and Numerical Problems in Backflush in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Journal Entries and Numerical Problems in Backflush: frequently asked questions

What is the journal entry for conversion cost allocated in backflush accounting?

When goods reach the trigger point, you credit Conversion Cost Allocated with units × standard conversion cost per unit. The debit goes to Finished Goods (or to COGS if the trigger is sale). At period end you debit Conversion Cost Allocated and credit Conversion Cost Control to close it.

How do I treat under-applied or over-applied conversion cost in backflush?

Find the difference between actual conversion cost in Conversion Cost Control and the balance in Conversion Cost Allocated. Under-applied cost is debited to COGS and over-applied cost is credited to COGS. Prorate across COGS and inventories only if the question asks for it.

Is there a Work-in-Process account in backflush costing?

In the common version there is no separate WIP account. Raw material and work-in-process are combined in Raw and In-Process Inventory, or no inventory account is kept at all when the trigger is sale. The question states which accounts to use.

Why is backflush costing suited to JIT firms?

JIT firms hold very little stock and move output quickly, so there is little to track between stages. Recording cost only at trigger points saves clerical work. Standard cost is fairly accurate because the gap between purchase, production and sale is short.