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Course 173 · Money course 44

Build a Business Income Projection and Test Assumptions

Produce a fictional twelve-month accrual income forecast with demand/capacity drivers, cost behavior, seasonality, sensitivity and revision log. Use complete original records and independently checked changed-input practice.

Before you start

Recommended preparation: Read Business Financial Statements.

Read Business Financial Statements See everything you’ll need

Free download · Original practice data · No external account required. Download the starter pack

What you’ll leave with

A fictional twelve-month accrual income forecast with demand/capacity drivers, cost behavior, seasonality, sensitivity and revision log.

Start course Start without an account. Sign in to save lesson progress across devices.

Your project

Start with the practice files. Build your project one lesson at a time.

Practice files are free without an account. Sign in to save your project record in My Proof: a description, checklist, and optional work link. Keep the original files in your own app or notebook; saving a project record does not upload them.

  1. Get your materialsDownload practice filesSupplied practice cases, a blank working record, complete lesson instructions, and annotated worked examples.
  2. Make your projectView the project checklist Work in your own notebook, document, or software. Use the supplied practice examples when you prefer.
  3. Keep a private recordSave a project record Sign in to save a description and checklist, then return to update them.
Course handbook

Know the route before you begin.

Here’s what you’ll need and what you’ll make. You can return to this guide during any lesson.

Who this is for

Learners ages 14+ and adults studying future or current business decisions through fictional cases; no financial transaction is required.

Prepare before lesson one
  • Recommended preparation: Read Business Financial Statements.
  • Use paper or a local spreadsheet and calculator. Supplied records contain no real identities or accounts.
  • Preserve original financial files in your own tool; My Proof stores a project description, checklist and optional work link.
Your final project

Finish with proof you can use.

A fictional twelve-month accrual income forecast with demand/capacity drivers, cost behavior, seasonality, sensitivity and revision log.

Save a project record in My Proof
See project checklist and review criteria

Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.

What to include

  • A feasible-unit and earned-revenue driver ledger.
  • A twelve-month seasonal sales and capacity reconciliation.
  • A cost-behavior and monthly profit bridge.
  • A checked twelve-month income statement with annual bridge.
  • A linked price/demand/cost sensitivity with twelve changed rows.
  • An actual-versus-static/flexible profit bridge and revision log.

Review and revise

Use these criteria to check your work and choose what to improve.

  • Drivers: demand/capacity/price/cost assumptions are explicit.
  • Aggregation: all 12 monthly rows reconcile annual profit.
  • Scenarios: linked changes update rounding/capacity consistently.
  • Evidence: actual/flexible/static bridges and historical revisions remain separate.
Three ideas to help you along the way
Three useful ideas

The rules behind the steps.

01

Model drivers

Do not force profit from an annual target.

02

Keep period constraints

Seasonal peaks need monthly capacity checks.

03

Explain variance

Separate volume, price and unit-cost effects.

What do these words mean?
Key words

Key terms worth knowing.

Driver
Inspectable input linking operational activity to financial output.
Capacity
Maximum deliverable units in the given period.
Accrual forecast
Modeled earned revenue and incurred expense by period.
Flexible comparison
Expected rules recalculated at actual activity.
Sensitivity
Declared changed input scenario and dependency result.
Your route

6 lessons.
One useful project.

Work in order the first time. Each lesson makes something the next lesson can use.

  1. 1
    Up next

    Define revenue drivers

    Translate separate demand, capacity and price assumptions into earned revenue.

  2. 2
    16 min

    Forecast seasonal sales

    Build twelve capacity-limited monthly unit estimates and compare uncapped demand.

  3. 3
    16 min

    Model variable and fixed costs

    Link variable expense to units while preserving stated fixed and noncash allocations.

  4. 4
    22 min

    Build a twelve-month income forecast

    Aggregate earned revenue, variable expense and monthly costs into one checked annual statement.

  5. 5
    19 min

    Test linked assumptions

    Rebuild demand, capacity, volume and profit together after a price-demand scenario.

  6. 6
    19 min

    Compare forecast with actual results

    Separate volume, price and unit-cost effects at actual activity and retain revised assumptions.

Use the tools

Tools to help you practice.

See all tools
ZIP · practice files

Build a Business Income Projection and Test Assumptions practice files

Supplied practice cases, a blank working record, complete lesson instructions, and annotated worked examples.

Text worksheet

Your course project worksheet

A downloadable text worksheet with each lesson’s working output, space for your answers, and the shared final-project checklist. Save your own copy.

Source transparency

Sources and further study.

Explore the references behind the lessons and take your learning further. Source notes explain access and reuse.

Open Stax: Managerial budget purpose
Source & access notes · checked 2026-10-01

Read flexible/rolling budget roles and revision; a projection remains an assumption-led model, not evidence of future sales.

Access: Public primary page body opened and relevant sections read through the web reader on 2026-10-01; no account required for reading.

Reuse: Original Life Starter cases, datasets and questions; no source exercise or worked dataset reproduced. Links support further reading.

Open Stax: Flexible budgets
Source & access notes · checked 2026-10-01

Read static versus actual-volume comparison and interpretation. Original January price/unit-cost decomposition replaces source cases.

Access: Public primary page body opened and relevant sections read through the web reader on 2026-10-01; no account required for reading.

Reuse: Original Life Starter cases, datasets and questions; no source exercise or worked dataset reproduced. Links support further reading.

Open Stax: Operating budgets
Source & access notes · checked 2026-10-01

Read revenue/activity and variable/fixed operating budgets, noncash expense and income-statement assembly; all monthly driver values are original.

Access: Public primary page body opened and relevant sections read through the web reader on 2026-10-01; no account required for reading.

Reuse: Original Life Starter cases, datasets and questions; no source exercise or worked dataset reproduced. Links support further reading.

Ready when you are

Start with the first useful move.

You’ll always know what to do, what to make, and where to go next.

Start lesson one