When input costs rise: how to split a cost variance into price and quantity
Purchases came in at 7,200 against a budget of 5,000. With surveys reporting higher input prices, it is tempting to blame suppliers and raise next year's budget. Split the 2,200 first. In this hypothetical example, 1,200 comes from paying more per unit and 1,000 from buying 100 more units than planned. Those two parts need different people to explain them and lead to different actions.
What the survey does and does not tell you
The Federal Reserve Banks' 2026 Report on Employer Firms, published in March 2026, draws on the 2025 Small Business Credit Survey. Among responding US employer firms that had sourced inputs from outside the US in 2024, 84% reported higher prices for those inputs in 2025 than in 2024. The question was in an optional trade section.
The survey used a convenience sample of employer firms with 1 to 499 employees. Weighting reduces known imbalances but does not make it a random sample. The result describes what respondents reported, not an inflation rate, a tariff estimate or a forecast of your 2026 costs.
Sources and context, checked :
Compare like with like
Check that budget and actual cover the same entity, period and account definitions, and that no cost has moved between lines. Look for timing and coding problems first: an annual invoice posted in one month, or a cost charged to the wrong department, can create a variance that has nothing to do with prices. Correct those through your normal approval process, not to make the variance smaller.
ACCA distinguishes a flexible budget, prepared for a range of activity levels, from a flexed budget, adjusted after the period to the activity actually achieved. Its cost model separates fixed and variable costs and also discusses stepped costs, so compare variable costs at actual activity rather than treating every cost as variable. Keep the original approved budget visible, label any revised forecast separately, and state your sign convention: if variance is actual minus budget, a positive cost variance is adverse.
Sources and context, checked :
Split the overrun into quantity and price
The business budgeted to buy 500 identical units at 10 each. It bought 600 at 12 each. The quantity effect values the extra 100 units at the budget price. The price effect applies the 2 increase to all 600 units actually bought.
| Step | Calculation | Amount |
|---|---|---|
| Budgeted purchases | 500 units × 10 | 5,000 |
| Extra units at budget price | 100 units × 10 | 1,000 |
| Higher price on units bought | 600 units × 2 | 1,200 |
| Actual purchases | 600 units × 12 | 7,200 |
What each part tells you to check
ACCA values a material price variance using the actual quantity bought, at actual price compared with standard price, which is the logic behind the 1,200 above. For that part, check the supplier's invoices against the agreed rate and ask whether the increase is a one-off charge or a new price. If you look for a cheaper source, remember ACCA's point that an apparent saving on input prices can come with worse yield or quality.
For the 1,000 quantity effect, find out why 100 more units were bought. Higher sales, stock-building and waste all produce the same number, so check sales volumes and stock records. ACCA's usage measure compares inputs with what actual output should have needed, so do not call this an efficiency or usage variance without that standard. Higher revenue alone does not prove volume grew, because selling prices may have risen too.
Sources and context, checked :
Turn the explanation into an action
For each material variance, record what happened, why, whether it is likely to continue and who will act by when. "Monitor" is not an action without a measure and a review date.
For this month's largest cost overrun, pull the supplier invoices to get units and unit prices, split the difference as above, and send two questions: one to the supplier asking whether the new price will continue, and one to operations asking why the extra units were needed. Then update the forecast for the conditions you now expect, including any known one-off payments ahead, and keep the original approved budget separate for comparison.