Cost and Management Accounting · Budgets and Budgetary Control

Functional Budgets: Sales, Production and Cost Budgets

Updated 4 October 2026 · Fact-checked

A functional budget is a budget for one function of the business, such as sales, production, materials, labour or overheads. You solve problems in a chain: start with the sales budget, then the production budget, then material, labour and overhead budgets, using stock adjustments at each step.

Understand Functional Budgets: Sales, Production and Cost Budgets

A functional budget is a plan, in units and rupees, for one function of the business. The functions are linked. What you can sell decides what you must produce. What you produce decides what materials, labour and overheads you need.

The sales budget comes first in most questions because sales is usually the principal budget factor, the limit on everything else. If a different factor limits the business, such as scarce material or plant capacity, you start from that factor instead.

The production budget converts sales into units to be made. It adjusts sales for opening and closing stock of finished goods. You make enough to meet sales and to build the closing stock you want, less the stock you already hold.

From the production budget you build the cost budgets. The material usage budget gives the quantity needed. The purchase budget adjusts usage for opening and closing stock of material. The labour budget gives hours and wages. The overhead budget separates variable overheads (which move with output) from fixed overheads (which do not).

Think of it as a flow: sales units, then production units, then material usage, then purchases, then costs. Each step uses the output of the one before. If you keep that order, even long problems become routine.

Key rules to remember

Production budget (units): Production = Budgeted sales + Closing stock of finished goods − Opening stock of finished goods; Use units, not rupees. Closing stock is often given as a percentage of next period's sales.
Material usage budget: Material required = Units to be produced × Standard material per unit; Include normal loss in the per-unit requirement if the question gives it.
Material purchase budget (quantity): Purchases = Material required for production + Closing stock of material − Opening stock of material; Multiply by price per unit of material to get the purchase cost.
Direct labour budget: Labour hours = Units produced × Standard hours per unit; Labour cost = Hours × Wage rate per hour; If idle time is given, add it to productive hours to get hours paid.
Overhead budget: Total overhead = Variable overhead rate × Activity + Fixed overhead; Treat fixed overhead as a lump sum for the period. Do not multiply it by output.
Sales budget (value): Sales value = Budgeted units × Selling price per unit; Do this product by product and by area if the question has more than one.

How to solve Functional Budgets: Sales, Production and Cost Budgets questions

Use this order for any functional budget question. It works whether the problem has one product or several.

1Read the question and identify the principal budget factor. If none is stated, assume sales.
2Prepare the sales budget in units, then in rupees (units × price), for each period.
3Prepare the production budget in units: sales + closing finished stock − opening finished stock. Work out each period's closing stock from the rule given.
4Prepare the material usage budget: production units × material per unit. Then prepare the purchase budget by adjusting for opening and closing material stock.
5Prepare the labour budget: production units × hours per unit, then hours × rate. Add idle time or overtime if given.
6Prepare the overhead budget: variable overhead on activity plus fixed overhead. Add all costs to get total cost and, if asked, profit.
7Present each budget in a clear table with period columns and a total column. Check that the total of the periods equals the annual figure.

Quickest way: Stock-adjustment grid for MCQs and written answers

When to use it: Use it when the question has several months or products and gives stock policies. It saves time in both MCQs and descriptive answers.

Draw one row for each line: sales, add closing stock, less opening stock, production. Put months across the columns.
Fill closing stock first. Opening stock of a month always equals closing stock of the previous month.
For MCQs, calculate only the period asked. Do not build the whole table. Check the options by working the one formula.
Eliminate options that ignore stock, since the sales figure itself is rarely the answer. Also eliminate options that multiply fixed cost by units.
In written answers, show each formula line and label units and rupees. Step marks are given for the stock adjustment and for correct totals, so do not skip lines.

Common mistakes in Functional Budgets: Sales, Production and Cost Budgets

Taking sales units as production units
You forget that finished stock changes between opening and closing.
Fix: Always write the three lines: sales, plus closing stock, minus opening stock. Do it even if stock is nil, to build the habit.
Using the wrong closing stock base
The question says closing stock is a percentage of next month's sales, and you apply it to the current month.
Fix: Read the stock policy twice. Mark which month's sales it refers to, and note that the last month needs the following period's sales given.
Confusing material usage with material purchases
Both use per-unit quantity, so they look alike.
Fix: Usage depends only on production. Purchases add closing material stock and deduct opening material stock. Draw them as two separate budgets.
Multiplying fixed overhead by units produced
You apply one overhead rate to all costs.
Fix: Split overhead into variable and fixed first. Variable is rate × activity. Fixed is the given lump sum, spread over periods only as stated.
Mixing units and rupees in one line
You rush the working and carry a quantity into a value column.
Fix: Keep separate units tables and rupee tables. Write the unit of measure beside every figure.
Valuing purchases using the issue price or selling price
Several prices appear in the question.
Fix: Purchase cost uses the purchase price per unit of material. Selling price is only for the sales budget.

Worked examples

Example 1

A company sells one product at ₹50 per unit. Budgeted sales for January, February and March are 4,000, 5,000 and 6,000 units. April sales are expected to be 7,000 units. Closing stock of finished goods at the end of each month should equal 50% of next month's sales. Opening stock on 1 January is 2,000 units. Prepare the sales budget in value and the production budget in units for the quarter.

Show the solution

Sales value: January 4,000 × ₹50 = ₹2,00,000. February 5,000 × ₹50 = ₹2,50,000. March 6,000 × ₹50 = ₹3,00,000. Total 15,000 units, ₹7,50,000.
Closing stock: January 50% of 5,000 = 2,500. February 50% of 6,000 = 3,000. March 50% of 7,000 = 3,500.
Opening stock: January 2,000 (given). February 2,500. March 3,000.
Production January = 4,000 + 2,500 − 2,000 = 4,500 units.
Production February = 5,000 + 3,000 − 2,500 = 5,500 units.
Production March = 6,000 + 3,500 − 3,000 = 6,500 units.
Total production = 4,500 + 5,500 + 6,500 = 16,500 units. Check: total sales 15,000 + closing 3,500 − opening 2,000 = 16,500.

Answer: Sales budget: ₹2,00,000, ₹2,50,000 and ₹3,00,000, total ₹7,50,000. Production budget: 4,500, 5,500 and 6,500 units, total 16,500 units.

Example 2

A firm plans to produce 16,500 units in a quarter. Each unit needs 3 kg of raw material costing ₹20 per kg and 2 direct labour hours at ₹40 per hour. Opening stock of raw material is 5,000 kg and the firm wants closing stock of 8,000 kg. Variable overhead is ₹10 per labour hour and fixed overhead for the quarter is ₹4,00,000. Prepare the material purchase budget and find the budgeted total conversion cost of labour and overheads.

Show the solution

Material required = 16,500 × 3 kg = 49,500 kg.
Purchases = 49,500 + 8,000 − 5,000 = 52,500 kg.
Purchase cost = 52,500 × ₹20 = ₹10,50,000.
Labour hours = 16,500 × 2 = 33,000 hours.
Labour cost = 33,000 × ₹40 = ₹13,20,000.
Variable overhead = 33,000 × ₹10 = ₹3,30,000. Fixed overhead = ₹4,00,000. Total overhead = ₹7,30,000.
Labour and overhead together = ₹13,20,000 + ₹7,30,000 = ₹20,50,000.

Answer: Material to be purchased is 52,500 kg costing ₹10,50,000. Labour cost is ₹13,20,000, overhead is ₹7,30,000 and the combined labour and overhead cost is ₹20,50,000.

Exam tips

MCQs on this topic are usually single-step stock adjustments. Write the formula first and calculate only the period asked.
In a written answer, give each budget its own table with a heading. Examiners award marks for the layout and for each correct line.
Read the stock policy sentence before you start. Most errors come from the base (this month's or next month's sales) and not from arithmetic.
If a question mentions a scarce resource, check whether it is the principal budget factor. If so, start from that factor and not from sales.
Always cross-check totals: total production must equal total sales plus net change in stock.

Practice questions from Budgets and Budgetary Control

Functional Budgets: Sales, Production and Cost Budgets in other exams

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

Functional Budgets: Sales, Production and Cost Budgets: frequently asked questions

What is the difference between a functional budget and a master budget?

A functional budget covers one function such as sales, production or purchases. The master budget combines all functional budgets into a summary of planned profit, balance sheet and cash position. You prepare the functional budgets first.

Why does the production budget start from the sales budget?

Sales is normally the principal budget factor, so what you can sell limits what you should make. The production budget then adjusts sales for changes in finished stock. If another factor is the limit, you start from that instead.

How do I calculate the material purchase budget?

First find material needed for planned production: units × material per unit. Then add the closing stock you want and subtract the opening stock. Multiply the result by the purchase price per unit.

Do I treat fixed overhead as changing with production?

No. Fixed overhead is a lump sum for the period within the relevant range. Only variable overhead changes with activity, so compute it as rate × activity and add the fixed amount separately.