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Strategic Cost Management · Back Flush Accounting

Trigger Points and Variations in Backflush Costing

Updated 11 October 2026 · Fact-checked

A trigger point is an event that makes you record a journal entry in backflush costing. The usual triggers are purchase of materials, completion of production and sale. You pick which ones to use. Then you cost completed or sold units at standard cost and work backwards to the inventory accounts.

Understand Trigger Points and Backflush Variations

In normal costing you track cost step by step: materials to work in process, then to finished goods, then to cost of goods sold. This needs many entries. Backflush accounting skips most of them. It waits for a trigger point, then uses the output at that point to work backwards and record the standard cost of the units.

The three common trigger points are purchase of raw materials, completion of finished units and sale of units. Under the full three-trigger method you make an entry at each. Materials purchased go into a combined Raw and In Process (RIP) Inventory account. Completion moves standard cost from RIP and conversion cost into Finished Goods. Sale moves standard cost from Finished Goods into Cost of Goods Sold.

Conversion costs (labour and overhead) are not charged to units as they are incurred. They are collected in a Conversion Cost Control account. At the trigger point you credit Conversion Cost Allocated at the standard rate. The difference between the control and allocated accounts is under- or over-applied conversion cost. It is normally closed to Cost of Goods Sold.

The variations come from dropping trigger points. With two triggers (purchase and sale) there is no Finished Goods account. With two triggers (completion and sale) there is no RIP account. With one trigger (sale only) there are no inventory accounts at all, so all costs go straight to cost of goods sold. The fewer the triggers, the simpler the books, but the less inventory is shown in the accounts.

You choose the variation by how much inventory there is. In a JIT firm, stock is tiny and produced units are sold quickly. Simple one- or two-trigger methods then give nearly the same profit as normal costing. If stock is large, a method with fewer triggers can misstate profit and inventory.

Key rules to remember

Standard cost per unit
Standard cost = Standard material cost + Standard conversion cost
This is the rate used to cost units at every trigger point.
Entry at purchase trigger
Dr RIP Inventory; Cr Accounts Payable (actual purchase cost)
Used when purchase of materials is a trigger. Otherwise materials go straight to cost of goods sold at the sale trigger.
Entry at completion trigger
Dr Finished Goods = Units completed × Standard cost; Cr RIP Inventory (units × standard material cost); Cr Conversion Cost Allocated (units × standard conversion cost)
Used when completion is a trigger.
Entry at sale trigger
Dr Cost of Goods Sold = Units sold × Standard cost; Cr Finished Goods (or Cr RIP and Conversion Cost Allocated if there is no completion trigger)
Used when sale is a trigger.
Under- or over-applied conversion cost
Conversion cost incurred (Conversion Cost Control) − Conversion cost allocated
A positive result is under-applied, so debit Cost of Goods Sold. A negative result is over-applied, so credit it. This is the usual treatment when amounts are small.
Closing inventory check
Closing RIP = Material purchased − Standard material of units at the last trigger; Closing FG = Completed units − Units sold, at standard cost
Use this to check your journal entries.

How to solve Trigger Points and Backflush Variations questions

Use this order for any question on trigger points and variations. It works whether the question gives you the triggers or asks you to choose them.

  1. 1Read which trigger points the question gives. List them in order: purchase, completion, sale.
  2. 2Find the standard cost per unit and split it into material and conversion cost.
  3. 3Decide which accounts exist. RIP exists only if purchase is a trigger. Finished Goods exists only if completion is a trigger.
  4. 4Write the entry at each trigger, using actual cost for purchases and standard cost for completed or sold units.
  5. 5Record conversion cost incurred in Conversion Cost Control. Record the allocated amount at the trigger point.
  6. 6Find the under- or over-applied conversion cost and close it to Cost of Goods Sold.
  7. 7Work out closing balances of RIP and Finished Goods, and check that the total cost is fully accounted for.
  8. 8If asked to choose or comment, link your answer to the level of inventory and how fast goods move.

Quickest way: Account-map shortcut

When to use it: Use when a numerical asks for journal entries or closing balances and time is short.

  1. Draw the chain: RIP, then Finished Goods, then Cost of Goods Sold. Cross out the accounts that do not exist for the given triggers.
  2. Compute units × standard cost for each trigger, with material and conversion split.
  3. Closing RIP and Finished Goods balances are found directly from units still in stock times standard cost. You need not post every entry first.
  4. Cost of Goods Sold = standard cost of units sold ± the conversion cost difference.

Common mistakes in Trigger Points and Backflush Variations

  • Creating a Work in Process and a separate Raw Materials account in a backflush solution.

    Students follow normal costing habits.

    Fix: Use one RIP Inventory account when purchase is a trigger. Where there is no purchase trigger, there is no inventory account for materials.

  • Debiting conversion costs to inventory when they are incurred.

    Students treat labour and overhead like materials.

    Fix: Debit Conversion Cost Control as incurred. Credit Conversion Cost Allocated only at the trigger point.

  • Costing completed or sold units at actual cost instead of standard cost.

    Students forget backflush works back from output.

    Fix: Use the standard cost per unit at completion or sale. Actual cost is used only for purchases and for incurred conversion cost.

  • Ignoring the under- or over-applied conversion cost.

    Students stop once all trigger entries are made.

    Fix: Always compare Conversion Cost Control and Conversion Cost Allocated, then close the difference to Cost of Goods Sold.

  • Recording a Finished Goods entry when completion is not a trigger.

    Students assume every product must pass through finished goods.

    Fix: Re-read the trigger list. If the triggers are purchase and sale, unsold completed units stay in RIP at standard cost.

  • Saying backflush suits every business.

    Students ignore the inventory condition.

    Fix: State that it suits low-inventory, stable-cost, JIT-type firms. For high inventory, it can give figures that differ from normal costing.

Worked examples

Example 1

Mehta Components Ltd uses backflush costing with three triggers: purchase of materials, completion of units and sale. Standard cost per unit is ₹500 (material ₹300, conversion ₹200). During the month it bought materials for ₹6,00,000, incurred conversion costs of ₹4,20,000, completed 2,000 units and sold 1,800 units. Pass journal entries and find closing balances.

Show the solution
  1. Purchase: Dr RIP Inventory ₹6,00,000; Cr Accounts Payable ₹6,00,000.
  2. Conversion cost incurred: Dr Conversion Cost Control ₹4,20,000; Cr Wages Payable and various accounts ₹4,20,000.
  3. Completion: units 2,000 × ₹500 = ₹10,00,000. Dr Finished Goods ₹10,00,000; Cr RIP Inventory ₹6,00,000 (2,000 × ₹300); Cr Conversion Cost Allocated ₹4,00,000 (2,000 × ₹200).
  4. Sale: 1,800 × ₹500 = ₹9,00,000. Dr Cost of Goods Sold ₹9,00,000; Cr Finished Goods ₹9,00,000.
  5. Conversion cost difference: ₹4,20,000 − ₹4,00,000 = ₹20,000 under-applied. Dr Cost of Goods Sold ₹20,000; Cr Conversion Cost Control ₹20,000. Conversion Cost Allocated is closed against Conversion Cost Control.
  6. Closing RIP = ₹6,00,000 − ₹6,00,000 = nil. Closing Finished Goods = ₹10,00,000 − ₹9,00,000 = ₹1,00,000 (200 units × ₹500). Cost of Goods Sold = ₹9,00,000 + ₹20,000 = ₹9,20,000.

Answer: Closing RIP is nil. Closing Finished Goods is ₹1,00,000. Cost of Goods Sold is ₹9,20,000 after charging ₹20,000 of under-applied conversion cost.

Example 2

Using standard cost per unit of ₹800 (material ₹500, conversion ₹300), Rao Engineering Ltd buys materials for 1,100 units at ₹5,50,000 and incurs conversion costs of ₹3,10,000. It completes 1,000 units and sells 900. It uses two triggers: purchase of materials and sale. Pass the entries and find closing RIP and Cost of Goods Sold.

Show the solution
  1. Purchase: Dr RIP Inventory ₹5,50,000; Cr Accounts Payable ₹5,50,000.
  2. Conversion cost incurred: Dr Conversion Cost Control ₹3,10,000; Cr various accounts ₹3,10,000.
  3. There is no completion trigger, so no entry is made when 1,000 units are completed and no Finished Goods account exists.
  4. Sale: 900 × ₹800 = ₹7,20,000. Dr Cost of Goods Sold ₹7,20,000; Cr RIP Inventory ₹4,50,000 (900 × ₹500); Cr Conversion Cost Allocated ₹2,70,000 (900 × ₹300).
  5. Difference: ₹3,10,000 − ₹2,70,000 = ₹40,000 under-applied. Dr Cost of Goods Sold ₹40,000; Cr Conversion Cost Control ₹40,000.
  6. Closing RIP = ₹5,50,000 − ₹4,50,000 = ₹1,00,000. It covers the material of 200 units: 100 completed but unsold, and 100 not yet completed.
  7. Cost of Goods Sold = ₹7,20,000 + ₹40,000 = ₹7,60,000.

Answer: Closing RIP is ₹1,00,000 and Cost of Goods Sold is ₹7,60,000. The conversion cost of the 100 completed unsold units is expensed in this variation, so profit is lower than under normal costing. This is why the method suits low-inventory firms.

Exam tips

  • Write the trigger points at the top of your answer. It shows the examiner which variation you are using and earns method marks.
  • Draw a quick account chain before writing entries. It stops you creating accounts that do not exist for the given triggers.
  • Show the material and conversion split of the standard cost in every entry. Marks are often given for each entry.
  • Always close the conversion cost difference to Cost of Goods Sold, and say so in one line.
  • For theory or case questions, tie the choice of trigger points to low inventory and JIT. Give one limitation, such as a weaker audit trail or distorted profit when stock is high.

Practice questions from Back Flush Accounting

Trigger Points and Backflush Variations: frequently asked questions

What are the three trigger points in backflush costing?

They are purchase of raw materials, completion of finished units and sale of units. A trigger point is the event that makes you record a journal entry. Firms can use all three or fewer.

What is the Raw and In Process (RIP) Inventory account?

It is a single account that combines raw materials and work in process. Materials purchased are debited to it. It is credited with the standard material cost of units completed or sold, depending on the triggers.

How do I choose a trigger point in backflush accounting?

Look at how much inventory the firm holds and how fast goods move. With very low inventory, fewer triggers such as purchase and sale, or sale only, give results close to normal costing. With high inventory, use more triggers so that inventory values are shown properly.

Where do conversion costs go in backflush costing?

They are debited to Conversion Cost Control as they are incurred. Standard conversion cost is credited to Conversion Cost Allocated at the trigger point. Any difference is usually closed to Cost of Goods Sold.