Strategic Cost Management · Variance Analyses

Planning and Operational Variances and Variance Investigation

Updated 11 October 2026 · Fact-checked

Planning variances show how much of the gap is due to a standard that was out of date. Operational variances show how well the team performed against a revised standard. You investigate a variance when its likely benefit exceeds the cost, it is controllable, and it is large or recurring. Standard costing entries record variances in separate accounts.

Understand Investigation, Interrelation and Advanced Variances

A variance is the difference between standard and actual. By itself it only tells you that something differed. To manage cost, you must know why it differed, who can control it, and whether it is worth chasing.

Causes and interrelation. Variances rarely stand alone. A cheap material (favourable price variance) may be poorer in quality, causing higher usage and more waste (adverse usage variance) and slower work (adverse efficiency variance). Buying in bulk to get a discount gives a favourable price variance but may raise storage cost. Overtime to meet a deadline gives an adverse labour rate variance but may remove an adverse idle time variance. So judge variances together, not one by one.

Controllable and uncontrollable. A controllable variance arises from a decision or action a manager can influence, such as wastage or idle time. An uncontrollable variance arises from outside factors, such as a market-wide rise in the price of steel or a government change in a levy. Management chases the controllable ones. Uncontrollable ones lead to a revision of standards.

Planning and operational variances. If the standard was set long ago and conditions have changed, the usual variance mixes two things: a poor standard and poor performance. Split it. The planning variance is the gap between the original standard and the revised (ex-post) standard, which is what the standard should have been in the actual conditions. The operational variance is the gap between the revised standard and the actual. Operational variances are the fair test of the manager. Planning variances are the responsibility of those who set the standard.

Accounting. Under standard costing, stock and work-in-progress are carried at standard cost. Each variance goes to its own variance account. Adverse variances are debits and favourable variances are credits. At the period end, variances are usually transferred to the Costing Profit and Loss Account, or sometimes apportioned to stock and cost of sales if large.

Key rules to remember

Planning variance (material price): (Original standard price − Revised standard price) × Actual quantity; Positive means favourable. Use the same logic for any element: original standard minus revised standard.
Operational variance (material price): (Revised standard price − Actual price) × Actual quantity; Positive means favourable. Measures performance against the revised standard.
Total price variance check: Planning variance + Operational variance = Variance on original standard; Use this to check your split.
Revised standard cost for actual output: Revised standard quantity for actual output × Revised standard price; Base for operational usage and efficiency variances.
Operational usage variance: (Revised standard quantity for actual output − Actual quantity) × Revised standard price; Positive means favourable.
Investigation rule of thumb: Investigate if expected benefit of correction > cost of investigation; Also consider size, trend, controllability and whether it is within tolerance limits.
Standard costing entries (adverse variance): Dr Variance A/c, Cr Material/Wages/Overhead control A/c; Favourable variance is the reverse: Dr control account, Cr Variance A/c.

How to solve Investigation, Interrelation and Advanced Variances questions

Use this order for questions that ask for planning and operational variances, investigation advice or journal entries.

1Read the question to see what changed: price, usage, rate, efficiency or volume, and when it became known.
2Write the original standard and the revised standard side by side for each element.
3Compute the planning variance as original standard minus revised standard, on the actual quantity or the actual output basis. Mark F or A.
4Compute the operational variance as revised standard minus actual, using the revised standard. Mark F or A.
5Check that planning plus operational equals the variance on the original standard.
6Decide controllability: assign operational variances to the manager, and planning variances to the budget or standard-setters.
7For investigation, compare size, trend and cost against likely benefit, then give a clear recommendation.
8For journal entries, pass entries at standard for stock and put each variance in its own account, adverse as a debit and favourable as a credit.

Quickest way: Split first, then judge

When to use it: Use when time is short and the question gives a revised standard or a market-wide price change.

Compute the total variance against the original standard in one line.
Compute the planning part using the revised figure. Operational is the balance, so you save one calculation.
Verify with the sum check, then label F or A on every figure.
For entries, list the accounts first: control account, variance account and direction. Fill in amounts last.
End with a one-line recommendation on who is responsible and whether to investigate.

Common mistakes in Investigation, Interrelation and Advanced Variances

Calculating operational variances on the original standard instead of the revised standard.
Students reuse the usual formulas without noticing the revised figure.
Fix: Whenever a revised standard is given, use it for all operational variances. Use the original only for the planning variance.
Getting the sign of the planning variance wrong.
The direction is easy to flip when the revised price is higher than the original.
Fix: Original minus revised. If the revised standard cost is higher than the original, the planning variance is adverse.
Investigating every large variance.
Students assume a large variance always needs a probe.
Fix: Check controllability and cost versus benefit. A large uncontrollable variance may call for revising the standard, not an investigation.
Reading each variance alone and blaming one department.
Formulas are learned separately, so links are missed.
Fix: Look for linked pairs, such as a favourable price with an adverse usage, and comment on the net effect.
Reversing the debit and credit for variances in journal entries.
Students confuse which side represents extra cost.
Fix: Adverse means extra cost, so debit the variance account. Favourable means saving, so credit it.
Giving a calculation with no comment.
Students stop once the number is found.
Fix: Add a short line on cause, responsibility and action. Such comments earn marks in written questions.

Worked examples

Example 1

A company budgeted material at a standard price of ₹50 per kg for 1,000 kg. Due to a market-wide rise, the price that should have applied at the time of purchase was ₹55 per kg. The company actually bought 1,000 kg at ₹54 per kg. Compute the planning and operational material price variances and comment.

Show the solution

Variance on original standard = (50 − 54) × 1,000 = ₹4,000 Adverse.
Planning variance = (50 − 55) × 1,000 = ₹5,000 Adverse.
Operational variance = (55 − 54) × 1,000 = ₹1,000 Favourable.
Check: ₹5,000 A + ₹1,000 F = ₹4,000 A, which matches.

Answer: Planning variance ₹5,000 Adverse; operational variance ₹1,000 Favourable; total ₹4,000 Adverse. The adverse result is due mainly to the market rise, which the purchase department cannot control. The purchase department performed better than the market by ₹1 per kg.

Example 2

A firm uses standard costing. It purchased 2,000 kg of material at an actual price of ₹48 per kg, where the standard price is ₹45 per kg. It issued 1,800 kg to production, whereas the standard quantity for actual output was 1,700 kg. Pass journal entries (material price variance on purchase; usage variance on issue).

Show the solution

Purchase at standard: 2,000 × ₹45 = ₹90,000. Actual cost: 2,000 × ₹48 = ₹96,000.
Price variance = ₹96,000 − ₹90,000 = ₹6,000 Adverse.
Entry 1: Dr Stores Control A/c ₹90,000; Dr Material Price Variance A/c ₹6,000; Cr Creditors A/c ₹96,000.
Issue at standard for actual output: 1,700 × ₹45 = ₹76,500.
Excess usage = (1,800 − 1,700) × ₹45 = ₹4,500 Adverse.
Entry 2: Dr Work-in-Progress Control A/c ₹76,500; Dr Material Usage Variance A/c ₹4,500; Cr Stores Control A/c ₹81,000 (1,800 × ₹45).

Answer: Price variance ₹6,000 Adverse and usage variance ₹4,500 Adverse, both debited to their variance accounts. WIP is charged at standard cost of ₹76,500, and stores are relieved at standard cost of ₹81,000.

Exam tips

When the question mentions market-wide changes or a revised standard, expect a planning versus operational split.
Always label every variance F or A and show the check that the parts add up to the total.
For investigation questions, give a reasoned recommendation using controllability, size, trend and cost-benefit, not just a definition.
In journal entries, write narrations and keep stock at standard cost. Show each variance account separately.
In Section A, watch for linked-variance MCQs, such as a favourable price with an adverse usage, and pick the option that reflects the link.

Practice questions from Variance Analyses

Investigation, Interrelation and Advanced Variances: frequently asked questions

What is the difference between planning and operational variances?

A planning variance is the gap between the original standard and the revised standard. It reflects an unrealistic or outdated standard. An operational variance is the gap between the revised standard and actual. It reflects how well the operations were run.

Which variances should be investigated?

Investigate variances that are controllable, large relative to the standard, persistent or worsening, and where the benefit of correcting exceeds the cost of investigating. Uncontrollable variances usually call for a revision of standards rather than an investigation.

Can a favourable variance be a problem?

Yes. A favourable price variance from cheaper material can cause an adverse usage variance through waste or poor quality. Always read variances together before praising or blaming anyone.

How do you record variances in a standard costing system?

Record stock and work-in-progress at standard cost. Debit adverse variances and credit favourable variances in separate variance accounts. At the period end, transfer them to the Costing Profit and Loss Account, or apportion them when they are large.