Marginal Costing for Decision Making

Marginal costing system is not a method of costing like job or batch costing or process costing or contract costing or operating costing which are used for the purpose of calculating the cost of products or services.

Marginal costing is very helpful in managerial decision making. Management’s production and cost and sales decisions may be easily affected from marginal costing. That is the reason, it is the part of cost control method of costing accounting. Before explaining the application of marginal costing in managerial decision making, we are providing little introduction to those who are new for understanding this important concept.

Marginal costing is used for managerial decision-making. It can be used in conjunction with any method of costing, such as job costing or process costing. It can also be used with other techniques of costing like standard costing and budgetary control. In this, only variable cost are considered.

Marginal cost is change in total cost due to increase or decrease one unit or output. It is technique to show the effect on net profit if we classified total cost in variable cost and fixed cost. The ascertainment of marginal costs and of the effect on profit of changes in volume or type of output by differentiating between fixed costs and variable costs. In marginal costing, marginal cost is always equal to variable cost or cost of goods sold. We must know following formulae

a) Contribution ( Per unit) = Sale per unit – Variable Cost per unit

b) Total profit or loss = Total Contribution – Total Fixed Costs

or  Contribution = Fixed Cost + Profit

or  Profit = Contribution – Fixed Cost

c) Profit Volume Ratio = Contribution/ Sale X 100 (It means if we sell Rs. 100 product, what will be our contribution margin, more contribution margin means more profit)

d) Break Even Point is a point where Total sale = Total Cost

e) Break Even Point (In unit) = Total Fixed expenses / Contribution

f) Break Even Point (In Sales Value) = Breakeven point (in units) X Selling price per unit

g) Break Even Point at earning of specific net profit margin = Total Contribution / Contribution per unit

or = fixed cost + profit / selling price – variable cost per unit

Profits Planning:

The process of profit planning involves the calculation of expected costs and revenues arising out of operations at different levels of plant capacity for the production of different types of goods during a given period of time. The cost and revenues at different level of operating are different and a concern has to choose one level at which its profits are maximum.

Pricing in Home and Foreign Markets:

Pricing of a product is governed primarily by its cost of production and the nature of competition being faced by the production unit. Once a price is fixed by market forces, it remains stable at least in the short period. During short period when selling period, marginal cost and fixed costs remain the same, an entrepreneur is in a position to establish relationship between them.

On the basis of such a relationship, it is very easy to fix the volume of sales and selling price during normal and abnormal times in the home market. How far the prices can be cut in case of foreign buyer to effect additional sales is a problem which is realistically answered by the marginal costing technique.

Pricing in Foreign Markets:

A foreign market can be kept separate from the domestic market due to many legal and other restrictions imposed on imports and exports and as such a different price can be charged from foreign buyers. Any company which enjoys surplus production capacity can increase its production to sell in the foreign market at lower price if its full fixed cost already stands recovered from the production from home market.

Price under Recession/Depression:

Recession is an economic condition under which demand is declining. During depression the demand is at its lowest ebb, and the firms are confronted with the problem of price reduction and closure of production. Under such conditions, the marginal costing technique suggests that prices can be reduced to a level of marginal cost. In that case, the firm will lose profits and also suffer loss to the extent of fixed costs. This loss will also be borne even if the production is suspended altogether. Selling below marginal cost is advisable only under very special circumstances.

Determining Profitability of Alternative Product-Mix:

Since the objective of an enterprise to maximise profits, the management would prefer that product-mix which is ideal one in the sense that it yields maximum profits. Products-mix means combination of products which is intended for production and sales. A firm producing more than one product has to ascertain the profitability of alternative combinations of units or values of products and select the one which maximises profits.

Production with Limiting Factor:

Sometimes, production has to be carried with certain limiting factor. A limiting factor is the factor the supply of which is not unlimited or freely available to the manufacturing enterprise. In case of labour shortages, the labour becomes limiting factor. Raw material or plant capacity may be a limiting factor during budget period.

The consideration of limiting factors is essential for the success of any production plan because the manufacturing firm cannot increase the production to the level it desire when a limiting factor is combined with other factors of production. The limiting factor is also called by the name of ‘scarce factor’ or ‘key factor,’ ‘principal budget factor’ or ‘governing factor.’

Make or Buy Decision (When Plant is not Fully Utilised):

If the similar product or component is available outside, then a manufacturing firm compares its unit cost of manufacture with the price at which it can be purchased from the market. The marginal cost analysis suggests that it is profitable to the total manufacturing cost. In other words the firm should prefer to buy if the marginal cost is more than the Bought-out price and Make when the marginal cost is lesser than the purchase price. However, the available plant capacity will exert its own influence in such a decision-making.

Equation:

Firm should buy when PP+FC is lesser than total cost of manufacture

Firm should manufacture when PP+FC is greater than total cost of manufacture

Expand or Buy Decision:

In case unused capacity is limited or does not exist, then an alternative to buying is to make by purchasing additional plant and other equipment. The firm should evaluate the capital expenditure proposal resulting out of expansion programme in terms of cash flows and cost of capital. If the installed capacity of the existing plant is partially being used, then it can be utilised by producing more internally. The additional production may necessitate purchase of some specialised equipment and thus involve interest and depreciation cost. It is advisable to expand and produce if the enterprise is able to save some costs by doing so.

Ascertaining Relative Profitability of Products:

A manufacturing concern engaged in the production of various products is interested in the study of the relative profitability of its products so that it may suitably change its production and sales policies in case of those products which it considers less profitable or unproductive. The concept of P/V Ratio provided by the marginal costing technique is much helpful in understanding the relative profit/ability of products. It is always profitable to encourage the production of that product which shows a higher P/V ratio.

Sometimes, the management is confronted with a problem of loss and it has to decide whether to continue or abandon the production of a particular product which has resulted in a net loss. Marginal costing technique properly guides the management in such a situation. If a product or department shows loss, the Absorption Costing method would hastily conclude that it is of no use of produce and run the department and it should be close down.

Sometimes this type of conclusion will mislead the management. The marginal costing technique would suggest that it would be profitable to continue the production of a product if it is able to recover the full marginal cost and a part of the fixed cost.