Budget vs. Actual: How to Explain the Difference

A variance is the difference between your budget and actual results. It tells you where to look, not who to blame. A lower cost may mean you worked more efficiently, delayed work or missed a bill. Higher revenue may come from more sales, higher prices or an error. Find evidence for the difference before deciding what to change.

1. Set a clear comparison and sign convention

Use the same period, accounting method, currency and accounts for both sets of figures. Check that actual records include important corrections and amounts earned or owed but not yet paid. Comparing a full-month budget with unfinished records shows work in progress, not a reliable picture of performance.

Throughout this article, dollar variance = actual − budget, and percentage variance = (actual − budget) ÷ budget × 100 when the budget is positive. A positive revenue variance is normally favourable; a positive expense variance is normally unfavourable. The sign itself does not carry the verdict.

If the budget is zero, the percentage is undefined. Show the dollar difference and explain the unbudgeted activity instead of reporting an invented percentage. For negative budget values, document a suitable interpretation rather than applying a positive-budget convention without thought.

2. Read the original monthly case

A fictional field-service business budgets 100 completed jobs at $240 each. It actually completes 90 jobs at an average of $255. These are accrual-based monthly results, not customer collections. Figures exclude sales taxes and financing effects; the simplified operating result includes only the items shown.

Illustrative monthly budget comparison in Canadian dollars

Item	Budget	Actual	Actual − budget
Service revenue	$24,000	$22,950	−$1,050
Employee labour	$7,200	$7,650	+$450
Subcontractors	$4,000	$3,600	−$400
Rent	$1,800	$1,800	$0
Software	$300	$540	+$240
Rush delivery	$0	$180	+$180
Total listed costs	$13,300	$13,770	+$470
Operating result	$10,700	$9,180	−$1,520

Revenue is approximately 4.4% below budget. Listed costs are approximately 3.5% above budget, and the operating result is approximately 14.2% below budget. Reconcile the bridge: a $1,050 revenue shortfall plus $470 of additional costs explains the $1,520 reduction. That arithmetic identifies the gap, but not its causes.

3. Separate volume from price before explaining revenue

The average selling price increased, so a simple claim that “prices were too low” misses the evidence. Use an explicit bridge with budget price for the volume effect and actual volume for the price effect:

• Volume effect: (90 − 100 jobs) × $240 = −$2,400.
• Average-price effect: 90 jobs × ($255 − $240) = +$1,350.
• Combined revenue variance: −$2,400 + $1,350 = −$1,050.

This explains the numerical movement, not why ten fewer jobs were completed. Inspect scheduling, cancellations, capacity, completion records and the sales mix. The higher average could reflect a rate change, larger jobs or fewer discounts. It does not prove that every customer paid a higher price for the same service.

Check whether work moved into the following month and whether revenue was recognized in the correct period. Do not repair a volume problem with an automatic price cut or count work that has not met the recognition requirements just to match the plan.

4. Diagnose costs using operating evidence

Labour is $450 over budget despite fewer completed jobs. The budget assumes 200 hours at $36; actual records show 191.25 hours at $40. Ask whether the rate reflects overtime, a different staffing mix or a genuine wage change. Compare hours per completed job and investigate rework, complexity and training before blaming staff.

Subcontractor costs are $400 below budget, but do not call it a saving yet. Check for missing bills and costs incurred but not yet paid. Was work postponed or done by employees instead? Fewer jobs may also mean lower costs. A fixed budget alone does not tell you whether you worked more efficiently or simply did less work.

Suppose a software invoice confirms an extra subscription, missed in the budget, that costs $240 per month. This changes future plans because the cost repeats. It is not just a payment falling in a different month. For the $180 rush delivery, the budget was zero, so you cannot calculate a percentage difference. Report the unplanned amount and check why the order needed it. A large percentage on a small cost may matter less than a small percentage on a large cost.

5. Turn findings into decisions and follow-up

Write each conclusion as evidence, action, owner and review date. For example, the operations lead checks the ten-job gap against the schedule before changing capacity. The administrator confirms whether the extra subscription is needed before the next renewal. The person responsible for purchasing reviews why the rush delivery occurred.

Keep the original approved budget. If new information changes what you expect next, update a separate forecast. Do not rewrite the old budget to hide the difference. Note which causes are confirmed, which are still guesses and which differences should reverse next month.

A short management explanation might read: “Lower completed volume outweighed a higher average price. Listed costs exceeded plan by $470. Subscription evidence confirms $240 of recurring additional cost; the labour and subcontractor relationship still needs review.” That is more actionable than “sales bad, expenses high,” and more honest than assigning every difference to one person.