Management Accounting · Marginal Costing (Management Accounting)

Reconciling Profit under Marginal and Absorption Costing

Updated 10 October 2026 · Fact-checked

Marginal and absorption costing give different profits only when opening and closing stock differ. Marginal costing treats fixed cost as a period cost. Absorption costing carries part of it in stock. Reconcile by multiplying the change in stock units by the fixed overhead rate per unit. Higher closing stock means higher absorption profit.

Understand Marginal Costing vs Absorption Costing Profit Reconciliation

Both methods value stock differently. Marginal costing values stock at variable cost only. All fixed costs are charged to the period in which they are incurred. Absorption costing values stock at full production cost, which is variable cost plus a share of fixed production overhead.

This share of fixed overhead is the whole reason profits differ. When you produce more than you sell, some units go into closing stock. Under absorption costing, the fixed overhead on those units moves to the next period inside the stock value. Under marginal costing it is charged off now. So absorption profit is higher in this period.

When you sell more than you produce, stock falls. Opening stock carrying fixed overhead from an earlier period is released into cost of sales. Absorption profit is then lower than marginal profit.

If opening stock equals closing stock in units, and the fixed overhead rate is the same in both periods, both methods show the same profit. If production equals sales, there is no difference.

Only fixed production overhead is carried in stock. Fixed selling and administration costs are period costs under both methods. Do not put them in stock value.

Key rules to remember

Profit difference: Absorption profit − Marginal profit = (Closing stock units − Opening stock units) × Fixed production overhead rate per unit; Use this when the fixed overhead rate is the same in both opening and closing stock. A negative answer means absorption profit is lower.
Reconciliation in rupees: Absorption profit = Marginal profit + Fixed overhead in closing stock − Fixed overhead in opening stock; Use this when the rate differs between periods. It always works because it uses rupee values.
Fixed overhead absorption rate: Rate per unit = Budgeted fixed production overhead ÷ Normal or budgeted production units; Based on normal or budgeted capacity, not actual production, unless the question says otherwise.
Contribution: Contribution = Sales − Variable cost of units sold (including variable selling cost); Marginal costing statement: Contribution − Total fixed cost = Profit.
Under/over absorption: Under-absorbed = Actual fixed overhead − (Actual production × Rate); Under-absorption reduces absorption profit. Over-absorption increases it. Marginal costing has no such adjustment.
Stock value per unit: Marginal: variable production cost only. Absorption: variable production cost + fixed overhead rate; Selling and distribution costs are excluded from stock under both methods.

How to solve Marginal Costing vs Absorption Costing Profit Reconciliation questions

Use this order for any question that asks for statements under both methods, a reconciliation, or both.

1Write out the units: opening stock, production, sales, closing stock. Check that opening + production − sales = closing.
2Find the fixed production overhead rate per unit from budgeted fixed overhead and normal output.
3Work out unit cost under each method. Marginal cost has variable production cost only. Absorption cost adds the fixed overhead rate.
4Prepare the marginal costing statement: sales, less variable cost of goods sold (adjusted for opening and closing stock), less variable selling cost, equals contribution. Then deduct all fixed costs to get profit.
5Prepare the absorption costing statement: sales, less cost of goods sold at full cost, then adjust for under or over absorption, giving gross profit. Deduct selling and administration costs to get profit.
6Reconcile: start with one profit, add or deduct the fixed overhead in closing stock and opening stock, and arrive at the other profit.
7Cross-check with the formula (closing units − opening units) × rate. State which method shows the higher profit and why.

Quickest way: Reconcile first, then verify with one statement

When to use it: Use when time is short, or when the question gives profit under one method and asks for the other.

Compute the change in stock units: closing − opening.
Multiply by the fixed overhead rate per unit. If opening stock was valued at an older rate, use rupee values instead: closing fixed overhead less opening fixed overhead.
If stock increased, add the amount to marginal profit to get absorption profit. If stock decreased, deduct it.
Write one line of explanation: fixed overhead was deferred to (or released from) stock.
Do the full statement for one method only if the question asks for it, and check that it agrees with your reconciliation.

Common mistakes in Marginal Costing vs Absorption Costing Profit Reconciliation

Adding fixed overhead to marginal costing stock value.
Students value stock at full cost out of habit from financial accounting.
Fix: Under marginal costing, stock carries only variable production cost. Underline this before you start.
Including selling and administration overheads in absorption stock value.
The words 'full cost' make students include every cost.
Fix: Stock is valued at production cost only. Show selling and administration costs below gross profit under both methods.
Using the wrong sign in the reconciliation.
Students memorise 'closing stock adds' but forget opening stock works the opposite way.
Fix: Closing stock defers fixed overhead (adds to absorption profit). Opening stock releases it (deducts). Check the direction by asking which method shows the higher profit.
Calculating the fixed overhead rate on actual production instead of normal capacity.
Students divide actual fixed cost by actual units.
Fix: Use budgeted fixed overhead ÷ normal or budgeted output unless the question says otherwise. Show the difference as under or over absorption.
Forgetting under or over absorption in the absorption statement.
The overhead recovered differs from actual when production differs from normal output, and this step gets skipped.
Fix: Always compare actual fixed overhead with the amount absorbed. Charge under-absorption against profit and credit over-absorption.
Writing 'profit is the same' because sales did not change.
Students focus on sales rather than on stock movement.
Fix: The difference depends on production versus sales. Check the stock change in units first.

Worked examples

Example 1

A company makes one product. Selling price ₹50 per unit. Variable production cost ₹30 per unit. Fixed production overhead is ₹2,00,000 a year, absorbed on a normal output of 20,000 units. Fixed selling and administration cost is ₹60,000. There is no opening stock. Production is 20,000 units and sales are 16,000 units. Prepare income statements under marginal and absorption costing and reconcile the profits.

Show the solution

Closing stock = 0 + 20,000 − 16,000 = 4,000 units. Fixed overhead rate = ₹2,00,000 ÷ 20,000 = ₹10 per unit.
Marginal costing: Sales 16,000 × ₹50 = ₹8,00,000. Variable cost of production 20,000 × ₹30 = ₹6,00,000. Less closing stock 4,000 × ₹30 = ₹1,20,000. Variable cost of sales = ₹4,80,000.
Contribution = ₹8,00,000 − ₹4,80,000 = ₹3,20,000. Fixed costs = ₹2,00,000 + ₹60,000 = ₹2,60,000. Marginal costing profit = ₹60,000.
Absorption costing: Production cost 20,000 × ₹40 = ₹8,00,000. Less closing stock 4,000 × ₹40 = ₹1,60,000. Cost of goods sold = ₹6,40,000. There is no under or over absorption, since production equals normal output.
Gross profit = ₹8,00,000 − ₹6,40,000 = ₹1,60,000. Less selling and administration ₹60,000. Absorption costing profit = ₹1,00,000.
Reconciliation: Marginal profit ₹60,000 + fixed overhead in closing stock (4,000 × ₹10 = ₹40,000) = ₹1,00,000. This matches the absorption profit.

Answer: Marginal costing profit = ₹60,000. Absorption costing profit = ₹1,00,000. The difference of ₹40,000 is fixed overhead carried forward in 4,000 units of closing stock.

Example 2

In the next year, the same company has opening stock of 4,000 units (valued at ₹40 per unit under absorption costing and ₹30 under marginal costing). Production is 18,000 units and sales are 22,000 units at ₹50. Variable cost per unit, actual fixed production overhead (₹2,00,000), the absorption rate (₹10 per unit) and fixed selling and administration cost (₹60,000) are unchanged. Under-absorbed overhead is written off to profit. Find the profit under both methods and reconcile.

Show the solution

Closing stock = 4,000 + 18,000 − 22,000 = 0.
Marginal costing: Sales 22,000 × ₹50 = ₹11,00,000. Variable cost of sales = opening ₹1,20,000 + production 18,000 × ₹30 (₹5,40,000) − closing nil = ₹6,60,000.
Contribution = ₹11,00,000 − ₹6,60,000 = ₹4,40,000. Less fixed costs ₹2,60,000. Marginal costing profit = ₹1,80,000.
Absorption costing: Opening stock ₹1,60,000 + production 18,000 × ₹40 (₹7,20,000) − closing nil = ₹8,80,000.
Overhead absorbed = 18,000 × ₹10 = ₹1,80,000. Actual = ₹2,00,000. Under-absorbed = ₹20,000, which is added to cost. Total cost = ₹9,00,000.
Gross profit = ₹11,00,000 − ₹9,00,000 = ₹2,00,000. Less selling and administration ₹60,000. Absorption costing profit = ₹1,40,000.
Reconciliation: Marginal profit ₹1,80,000 − fixed overhead in opening stock (4,000 × ₹10 = ₹40,000) + fixed overhead in closing stock (nil) = ₹1,40,000. This matches.

Answer: Marginal costing profit = ₹1,80,000. Absorption costing profit = ₹1,40,000. Absorption profit is lower by ₹40,000 because stock fell by 4,000 units and the fixed overhead brought forward in opening stock was charged to this year.

Exam tips

Write the unit stock movement (opening, production, sales, closing) first. Examiners give step marks for it and it prevents most errors.
Show the reconciliation as a separate small statement with a clear heading, even if the question only asks for the profits. It helps a marker see you understand the cause.
Always add one sentence of interpretation: which method shows the higher profit, and that the difference is only a timing difference in fixed overhead.
In MCQs, check the stock change before any calculation. If opening and closing stock units are equal and the rate is unchanged, the profits are equal, so eliminate any option showing a difference.
When the question gives multiple periods, carry the closing stock value forward as opening stock at the same basis. Do not recompute it at the new period's rate unless told to.

Practice questions from Marginal Costing (Management Accounting)

Marginal Costing vs Absorption Costing Profit Reconciliation in other exams

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

Marginal Costing vs Absorption Costing Profit Reconciliation: frequently asked questions

Why does absorption costing show a higher profit when closing stock rises?

Part of the period's fixed production overhead is included in the value of the unsold units and carried to the next period. Marginal costing charges all of that overhead to the current period. So absorption costing charges less fixed cost this period and shows a higher profit.

Do the two methods ever give the same profit?

Yes. If opening and closing stock are the same in units, and the fixed overhead rate has not changed between the periods, the profits are equal. This also holds when production equals sales and there is no stock movement.

What is the effect of opening stock on profit under marginal and absorption costing?

Opening stock under absorption costing carries fixed overhead from the earlier period. When it is sold, that overhead is charged in the current period and reduces absorption profit. So opening stock pushes absorption profit below marginal profit, and closing stock pushes it above.

Are selling and administration costs included in stock value?

No. Under both methods, stock includes only production costs. Marginal costing stock has variable production cost. Absorption costing stock has variable plus fixed production cost. Selling and administration costs are charged to the period.