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ACCA Applied Skills · Performance Management

Sales Mix and Quantity Variances for ACCA PM

Sales mix and quantity variances split the total sales volume variance into two parts. The mix variance shows the effect of selling a different proportion of products than budgeted. The quantity variance shows the effect of selling more or fewer units in total, at the budgeted mix. Both use standard profit or contribution per unit.

What this chapter covers

This chapter breaks the sales volume variance into two causes. The first is sales mix: did you sell the products in the planned proportions? The second is sales quantity: did you sell more or fewer units overall? Together the two add up to the total sales volume variance.

The chapter builds on basic variance analysis. You already know that the sales volume variance is the difference between actual and budgeted units, valued at the standard profit (or contribution) per unit. Here you go one step further and ask why volume differed from budget. The method is the same as for material mix and yield variances, so if you can do one you can do the other.

It links to the rest of PM in several ways. Operating statements and variance reconciliations often include mix and quantity lines. Performance reporting questions ask you to comment on whether managers controlled the results. Objective test questions can ask you to calculate one variance, or to state what an adverse result means. Written parts of Section C often ask you to explain the figures.

Variance analysis is a core PM area and appears in Section A, Section B and Section C. Mix and quantity variances are a favourite because they test both calculation and judgement. Objective test questions are marked all or nothing, so a small slip, such as using the wrong profit measure, loses the whole question. In constructed response questions, you can pick up method marks and comment marks even if one number is wrong. The method is short and repeatable, which makes this a good chapter to master early.

Sales mix and quantity variances: topics in the order to study them

  1. 1Sales Mix and Quantity Variances OverviewStart here to see how the two variances fit inside the sales volume variance and when a business has more than one product.
  2. 2Calculating Sales Mix VarianceLearn mix first because it needs the actual total quantity sold at both actual and budgeted mix, and it sets up the quantity step.
  3. 3Calculating Sales Quantity VarianceQuantity comes next because it uses the same budgeted-mix column and completes the split of the volume variance, so you can check your total.
  4. 4Interpreting Mix and Quantity VariancesFinish with interpretation, because you need the numbers and their signs before you can explain causes, links and what management should do.

How to prepare Sales mix and quantity variances

Treat this chapter as one method that you practise until it is automatic, then add the commentary skills.

  1. Revise the sales volume variance first: (actual units − budgeted units) × standard profit per unit. Be clear whether your question uses profit or contribution, and stay consistent.
  2. Learn the three-column layout: actual quantity sold at actual mix, actual total quantity at budgeted mix, and budgeted quantity at budgeted mix. Draw it every time.
  3. Work one two-product example by hand. Calculate the mix variance and the quantity variance, then check that they add up to the total sales volume variance.
  4. Practise the sign rule. A favourable variance increases profit and an adverse variance reduces it. Say this in words for each answer.
  5. Do objective test questions under time pressure, including ones that ask for the cause or meaning of a variance rather than a number.
  6. Write short explanations for each variance. State what happened, a possible cause and one link to another variance, such as price or market share.
  7. Attempt a full operating statement question and include mix and quantity lines in the reconciliation.

Common mistakes in Sales mix and quantity variances

  • Using selling price instead of standard profit or contribution per unit.

    Fix: Write the margin per unit for each product at the top of your working. Use it in every line of the mix and quantity calculation.

  • Using the wrong total quantity in the budgeted-mix column.

    Fix: Use the actual total quantity split in the budgeted proportions for the mix variance. Label each column clearly before filling it in.

  • Getting the sign wrong.

    Fix: Ask whether the change increases profit. If yes, it is favourable. Check the sign against that logic, not only against the arithmetic.

  • Not checking that mix and quantity add up to the sales volume variance.

    Fix: Calculate the total sales volume variance first or last. It takes seconds and catches most errors.

  • Giving a generic comment such as the variance is adverse because sales were poor.

    Fix: Name the specific shift in products, give a plausible cause such as pricing, promotion or stock shortages, and say what management should do.

  • Treating mix as controllable when products are not substitutes.

    Fix: State whether customers can switch between products. If they cannot, say mix is driven by demand and is less meaningful as a control measure.

Last-day revision: Sales mix and quantity variances

  • Sales volume variance = mix variance + quantity variance.
  • Use standard profit per unit, or standard contribution per unit if the question uses marginal costing. Stay consistent.
  • Mix variance compares actual quantity sold in the actual mix with actual total quantity in the budgeted mix.
  • Quantity variance compares actual total quantity in the budgeted mix with budgeted quantity in the budgeted mix.
  • Draw the three columns before calculating anything.
  • Selling more of high-margin products than planned gives a favourable mix variance.
  • Selling more units in total than budgeted gives a favourable quantity variance, if the budgeted mix has a positive margin.
  • Mix variances only make sense when products are related or can be substituted. Say so in comments.
  • Check that your two variances add up to the total sales volume variance.
  • Always label variances as favourable or adverse.
  • Comments should give a cause and a consequence, not just repeat the number.

Sales mix and quantity variances practice questions

Sales mix and quantity variances in other exams

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

Sales mix and quantity variances: frequently asked questions

What is the difference between sales mix and sales quantity variance?

The mix variance measures the effect of selling a different proportion of products than budgeted. The quantity variance measures the effect of selling more or fewer units in total at the budgeted mix. Together they make up the sales volume variance.

Do I use profit or contribution to value these variances?

Use whichever the question's costing system uses. Under absorption costing, use standard profit per unit. Under marginal costing, use standard contribution per unit. Do not mix the two in one answer.

Can mix and quantity variances be tested in objective test questions?

Yes. You may be asked to calculate one of them or to say what a result means. Objective test questions are all or nothing, so check your margins and the sign before you answer.

How do I comment on a mix variance in a written answer?

Say which products were sold more or less than planned and whether that raised or lowered profit. Give a possible cause, such as a price change or a stock shortage, and note whether managers could control it.