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Strategic Cost Management · Just in Time (JIT)

Costing and Accounting under JIT: Backflush Costing

Updated 11 October 2026 · Fact-checked

Backflush costing is a JIT method that skips detailed tracking of costs through work in progress. You record costs only at chosen trigger points, such as purchase of materials or completion or sale of goods. Then you work backward, using standard cost, to flush costs out to finished goods and cost of goods sold.

Understand Costing and Accounting under JIT (Backflush)

Traditional costing tracks every rupee as material moves from stores to work in progress, to finished goods, to sale. This needs many entries, job cards and stock records. It makes sense when stocks are large and production is slow.

Under JIT, materials arrive just as production needs them, and goods are made just as customers need them. Stocks are very small and production cycles are short. Tracking each stage costs more than it is worth. So JIT simplifies the accounting.

Backflush costing (also called backflush accounting) records entries only at a few trigger points. A trigger point is an event that causes an entry. Typical triggers are purchase of raw material, completion of finished goods, and sale of goods. Costs are not recorded step by step. Once a trigger occurs, you use the standard cost per unit to work backward and assign costs to the outputs.

Many JIT firms use a raw and in-process (RIP) account that combines raw materials and work in progress. Labour and overheads are often combined as conversion cost, because direct labour is a small share of cost in an automated, cell-based plant. Conversion costs are charged to a conversion cost control account as incurred and applied to products at standard rates. Any difference is under or over-applied conversion cost, usually closed to cost of goods sold at period end.

Backflush gives less detail and weaker audit trail. It suits firms with stable processes, low stocks and reliable standard costs. If stocks at period end are large, the simplified entries can misstate profit.

Key rules to remember

Standard cost per unit
Standard cost per unit = Standard material cost + Standard conversion cost
This rate is used to flush costs to finished goods and cost of goods sold.
Cost flushed on completion
Cost to Finished Goods = Units completed × Standard cost per unit
Used when the trigger is completion of production.
Cost flushed on sale
Cost of Goods Sold = Units sold × Standard cost per unit
Used when the trigger is sale. Under a sale-only trigger, there may be no finished goods entry.
Conversion cost applied
Conversion cost applied = Units produced × Standard conversion cost per unit
Credit Conversion Cost Control, debit Finished Goods or Cost of Goods Sold as per the trigger. Where sale is the trigger, the units costed are the units sold.
Under or over-applied conversion cost
Actual conversion cost incurred − Conversion cost applied
A positive figure is under-applied (a debit balance), a negative figure is over-applied. Normally adjusted to Cost of Goods Sold.
Common trigger point sets
Set 1: purchase of materials, completion of production and sale. Set 2: purchase of materials and sale. Set 3: completion of production and sale only.
Which entries appear, and where stock is held, depends on the trigger set.

How to solve Costing and Accounting under JIT (Backflush) questions

Use the same method for any backflush question. Decide the trigger points first, since they decide every entry.

  1. 1Read the question and note the trigger points. Identify what is recorded at purchase, at completion and at sale.
  2. 2Work out the standard cost per unit, split into material and conversion cost.
  3. 3List the facts: material purchased, units produced, units sold, and actual conversion costs incurred.
  4. 4Write the entry for material purchase. Debit RIP (or Raw Materials) at actual purchase cost and credit Accounts Payable, if material purchase is a trigger.
  5. 5Record actual conversion costs: debit Conversion Cost Control, credit Wages Payable, Accounts Payable or other accounts.
  6. 6At the next trigger, flush standard cost: units × standard cost. Debit Finished Goods (or COGS) and credit RIP and Conversion Cost Applied.
  7. 7Compute the difference between actual and applied conversion cost, and close it to Cost of Goods Sold.
  8. 8Find closing balances in RIP and Finished Goods, and state profit or the requested figure.

Quickest way: Trigger table method

When to use it: Use it when the question asks for journal entries or closing stock under a given trigger set and time is short.

  1. Draw three small columns: purchase, completion, sale.
  2. Tick the columns that are triggers. Only ticked columns get entries.
  3. Multiply units by standard cost for each ticked column, and write the entry straight away.
  4. Total conversion cost applied, compare with actual, and post the difference to COGS.
  5. Closing RIP = material purchased − material flushed. Closing FG = units completed − units sold, at standard cost.

Common mistakes in Costing and Accounting under JIT (Backflush)

  • Recording entries at every stage of production, as in normal job or process costing.

    Students are used to tracing costs through work in progress.

    Fix: Under backflush, only trigger points create entries. Check the question and post only at those points.

  • Using actual cost instead of standard cost when flushing to finished goods or COGS.

    Actual cost is used for purchases, so students carry it forward.

    Fix: Purchases go in at actual cost. Flushing uses standard cost per unit.

  • Forgetting the under or over-applied conversion cost at the end.

    Students stop after posting the flush entries.

    Fix: Always compare actual conversion cost with the amount applied, then close the difference, usually to COGS.

  • Treating the difference as a gain when it is under-applied, or the reverse.

    The sign is confused when the account balances are compared.

    Fix: If actual exceeds applied, it is under-applied and a debit to COGS. If applied exceeds actual, it is over-applied and a credit.

  • Using a finished goods account when the question says the trigger is sale only.

    Students follow the usual flow of material to finished goods to sale.

    Fix: With sale as the only trigger, cost is flushed straight to COGS, and unsold finished goods are not recorded at the time of production.

  • Splitting direct labour and overhead separately in a JIT question that gives one conversion cost figure.

    Habit from traditional costing.

    Fix: Use one conversion cost control account when the question combines labour and overheads.

Worked examples

Example 1

Asha Components Ltd uses backflush costing with three trigger points: purchase of raw material, completion of finished goods and sale. Standard cost per unit is ₹100 for material and ₹60 for conversion, a total of ₹160. In March it bought material for ₹5,20,000 on credit. Actual conversion costs were ₹3,10,000. It completed 5,000 units and sold 4,800 units. Prepare the journal entries and find the closing balances of RIP and Finished Goods.

Show the solution
  1. Trigger 1, purchase: Dr RIP ₹5,20,000, Cr Accounts Payable ₹5,20,000.
  2. Conversion cost incurred: Dr Conversion Cost Control ₹3,10,000, Cr Wages Payable and Other Accounts ₹3,10,000.
  3. Trigger 2, completion: standard cost = 5,000 × ₹160 = ₹8,00,000. Material flushed = 5,000 × ₹100 = ₹5,00,000. Conversion applied = 5,000 × ₹60 = ₹3,00,000.
  4. Entry: Dr Finished Goods ₹8,00,000, Cr RIP ₹5,00,000, Cr Conversion Cost Control ₹3,00,000.
  5. Trigger 3, sale: cost of units sold = 4,800 × ₹160 = ₹7,68,000. Dr COGS ₹7,68,000, Cr Finished Goods ₹7,68,000.
  6. Conversion cost control: Dr ₹3,10,000, Cr ₹3,00,000. Balance ₹10,000 debit, which is under-applied. Dr COGS ₹10,000, Cr Conversion Cost Control ₹10,000.
  7. Closing RIP = ₹5,20,000 − ₹5,00,000 = ₹20,000.
  8. Closing Finished Goods = ₹8,00,000 − ₹7,68,000 = ₹32,000, which is 200 units × ₹160.
  9. Total COGS = ₹7,68,000 + ₹10,000 = ₹7,78,000.

Answer: Closing RIP is ₹20,000 and closing Finished Goods is ₹32,000. Under-applied conversion cost of ₹10,000 is charged to COGS, so total COGS is ₹7,78,000.

Example 2

Kaveri Auto Parts Pvt Ltd uses backflush costing with two trigger points: purchase of raw material and sale of finished goods. Production is not a trigger. Standard cost is ₹90 per unit, of which material is ₹55 and conversion is ₹35. In a month it purchased material for ₹2,90,000 and incurred actual conversion cost of ₹1,80,000. It produced 5,200 units and sold 5,000 units. Find the cost of goods sold, the inventory carried and the effect on profit of the conversion cost difference.

Show the solution
  1. Trigger 1, purchase: Dr RIP ₹2,90,000, Cr Accounts Payable ₹2,90,000. Actual conversion cost of ₹1,80,000 is accumulated by Dr Conversion Cost Control, Cr Wages Payable and Other Accounts. No entry is made when production is completed.
  2. Trigger 2, flush on sale: 5,000 × ₹90 = ₹4,50,000. Material portion = 5,000 × ₹55 = ₹2,75,000. Conversion portion = 5,000 × ₹35 = ₹1,75,000.
  3. Entry: Dr COGS ₹4,50,000, Cr RIP ₹2,75,000, Cr Conversion Cost Control ₹1,75,000.
  4. Conversion cost control: Dr ₹1,80,000, Cr ₹1,75,000. Balance ₹5,000 debit, which is under-applied. Dr COGS ₹5,000, Cr Conversion Cost Control ₹5,000.
  5. Total COGS = ₹4,50,000 + ₹5,000 = ₹4,55,000.
  6. Why the balance arises: the actual ₹1,80,000 covers 5,200 units produced, but Conversion Cost Control is credited only for the 5,000 units sold. Standard conversion cost of all 5,200 units is 5,200 × ₹35 = ₹1,82,000, so spending was actually ₹2,000 below standard. The ₹5,000 debit is the ₹7,000 standard conversion cost of the 200 unsold units (200 × ₹35) less that ₹2,000 saving.
  7. Closing RIP = ₹2,90,000 − ₹2,75,000 = ₹15,000. No finished goods account exists because production was not a trigger.
  8. The RIP balance holds the material for the 200 unsold units (200 × ₹55 = ₹11,000 at standard) plus ₹4,000 of other material purchased but not yet flushed. The conversion cost of the unsold units (₹7,000 at standard) is not in RIP. It stays in Conversion Cost Control.
  9. Writing the whole ₹5,000 to COGS is a simplification. It effectively expenses the conversion cost of the 200 unsold units in this month, so inventory is understated and profit is lower by that amount, net of the ₹2,000 spending saving.

Answer: Total COGS is ₹4,55,000. Inventory carried is ₹15,000 in RIP, with no finished goods account. The ₹5,000 debit balance in Conversion Cost Control is charged to COGS and reduces profit by ₹5,000. It is not pure inefficiency: it mainly reflects the ₹7,000 conversion cost of the 200 unsold units, less a ₹2,000 saving on spending.

Exam tips

  • Underline the trigger points in the question first. Every entry depends on them.
  • In MCQs, a common test is which accounts exist. With sale as the only trigger, there is no Finished Goods account at the time of production.
  • Show a short conversion cost control account in numerical answers. It makes the under or over-applied figure clear and earns method marks.
  • Close with a one-line comment on the limitations: weak audit trail, suited to low stocks and stable standard costs.
  • Check that closing RIP plus flushed material equals material purchased. This catches most arithmetic slips.

Practice questions from Just in Time (JIT)

Costing and Accounting under JIT (Backflush): frequently asked questions

What is a trigger point in backflush costing?

A trigger point is an event that causes an accounting entry. Common ones are purchase of raw material, completion of production and sale of goods. Between trigger points, no entries are made for the movement of costs.

Why is backflush costing used in JIT?

JIT keeps stocks and production time very low, so tracking costs through each stage adds little value. Backflush cuts the number of entries and the paperwork. It relies on standard costs to assign costs to output.

What is the raw and in-process (RIP) account?

It is a single account that combines raw material and work in progress. Material purchases are debited to it. Material cost is credited out when goods are completed or sold, depending on the trigger.

How is under-applied conversion cost treated?

When actual conversion cost exceeds the amount applied, the difference is under-applied. It is normally written off to cost of goods sold at period end, which reduces profit. Over-applied cost is credited to cost of goods sold.

What are the limitations of backflush costing?

It gives a weaker audit trail and less information for control. It can misstate profit if stocks at period end are large. It works best where standard costs are reliable and processes are stable.