From costing the past to planning the future
Everything you have done on this ladder so far has been about *measuring what already happened* — costing a job that was made, tracing a contribution margin on units that were sold, telling apart fixed and variable costs in last quarter's numbers. Budgeting turns that telescope around to point at the future. The same cost behaviour you learned to read backward, you now use to forecast forward: if you know how cost moves with volume, you can ask 'what will next year cost if we sell *this much*?' and write the answer down before a single unit is made. A budget is simply a plan expressed in numbers, for a future period, with money attached.
A single budget is useful, but a business does not run on one plan in isolation. The sales team's plan, the factory's plan, the purchasing plan, the hiring plan, and the treasurer's cash plan must all fit *together* — you cannot promise to sell 100,000 units while the factory only plans to make 60,000, or schedule a loan repayment in a month the cash plan says will be empty. The [[master-budget|master budget]] is the name for all of these individual budgets stitched into one coordinated, internally consistent whole. It is the entire coming year — operations and finances alike — written out as a single connected document, where every page agrees with every other page.
Two halves: operating budgets and financial budgets
The master budget splits cleanly into two halves, and the split is the operating-versus-financial budget distinction. The operating budgets plan the *activity* of the business — how much to sell, how much to make, how much material and labour and overhead that will take, and what inventory to leave on the shelf. They are denominated in units and in operating dollars, and they read like a story of the factory and the shop floor. The financial budgets then plan the *money and the position* that flow out of all that activity — the cash coming in and going out, and the income statement and balance sheet the year will end on.
The order matters enormously, and it is not arbitrary. You build *all* the operating budgets first, because they describe physical reality — units, hours, kilograms of raw material — and money is downstream of physical reality. You cannot sensibly budget cash until you know how many units you plan to make, because making units is what consumes the cash. So the financial budgets sit at the *end* of the chain, fed by everything the operating budgets decided. A useful mental picture: the operating budgets are the script of the play; the financial budgets are the box-office and accounting report of what that play will cost and earn.
The operating budgets, link by link
Every operating budget begins with one number, and that number is sales. The [[sales-budget|sales budget]] — expected units to be sold times expected selling price — is the *master* of the master budget, because almost everything downstream is computed from it. This is the single most important and most uncertain figure in the whole document: a forecast of customer behaviour that no one can know for sure. Get it badly wrong and every page that follows inherits the error, which is exactly why so much care, and so many people, go into it. From this one root the whole tree grows.
Next comes the [[production-budget|production budget]], and here the first piece of real cleverness appears. How many units must the factory make? Not simply the units you plan to sell — you must also leave a sensible cushion of finished goods on the shelf for next period (the *desired ending inventory*), and you already start the period holding whatever was left over last time (the *beginning inventory*). So units to produce = units to sell + desired ending inventory − beginning inventory. If you plan to sell 10,000 units, want 1,500 in stock at the end, and start with 1,200, you must make 10,300 — not 10,000. Inventory policy, not just sales, drives the factory.
Once the production budget fixes how many units to make, three more operating budgets fall out of it almost mechanically. The direct materials budget asks how much raw material those units need (with the very same beginning/ending-inventory logic applied to material, so you can budget what to *purchase*, not just what to use). The direct labour budget asks how many labour hours and what wage cost the production demands. The manufacturing overhead budget plans the indirect factory costs — using the cost-behaviour split you already know, with variable overhead rising per unit and fixed overhead sitting flat. Finally the ending finished-goods inventory budget values the units left unsold, which the financial budgets will need.
THE CASCADE (units, one quarter) SALES BUDGET Units to sell 10,000 PRODUCTION BUDGET Units to sell 10,000 + Desired ending inventory + 1,500 - Beginning inventory - 1,200 = Units to PRODUCE 10,300 DIRECT MATERIALS BUDGET (2 kg per unit) Material for production 10,300 x 2 = 20,600 kg + Desired ending raw material + 3,000 kg - Beginning raw material - 2,500 kg = Material to PURCHASE 21,100 kg DIRECT LABOUR BUDGET (0.5 hr per unit) Labour hours required 10,300 x 0.5 = 5,150 hrs ...each line feeds the next; one root number, sales, has now sized the factory, the warehouse, and the payroll.
The financial budgets: where it all turns into money
With the operating budgets settled, the financial half collects their outputs and answers the questions an owner actually loses sleep over. The first and most urgent is the [[cash-budget|cash budget]]: not 'will we be profitable?' but 'will we have the cash on hand, month by month, to pay what we owe when it falls due?'. It lays out expected cash receipts (collections from customers, which lag the sales budget because credit customers pay later) against expected cash disbursements (paying suppliers, wages, overhead, taxes, loan instalments, equipment), and shows the running cash balance. Where that balance threatens to go negative, the cash budget is the early warning that says *borrow now*, or *delay that purchase*.
Here a hard-won lesson from the cash flow statement earlier on this ladder comes back to bite: profit is not cash. A budget can show a handsome budgeted profit and yet the cash budget can flash red, because you pay for materials and wages *before* customers pay you, and because buying a machine drains cash without ever touching profit. The cash budget exists precisely so that a profitable-on-paper plan does not quietly march the business into running out of money mid-year. It is the most operationally vital page in the whole master budget, and the one most likely to change a decision.
The master budget then closes with the [[budgeted-financial-statements|budgeted financial statements]] — sometimes called *pro forma* statements, meaning 'as a matter of form', i.e. projected. The *budgeted income statement* assembles the budgeted sales, cost of goods sold, and operating expenses into the year's planned profit. The *budgeted balance sheet* projects what the business will own and owe at year-end, taking the beginning balance sheet and applying every change the other budgets implied — the new inventory, the collected and uncollected receivables, the ending cash from the cash budget, the new equipment, the loans drawn or repaid. When that final balance sheet balances, with assets equal to liabilities plus equity, you have proof that the whole interlocking plan is arithmetically consistent.
How the budgets cascade — and who gets to write them
Step back and the master budget reveals itself as one long chain of dependence, where each link is computed from the link before it. This is the single most important thing to hold in your head, so here it is laid out as the path a number travels.
- Forecast sales — units and price — in the sales budget; this single root sizes everything else.
- Derive units to produce from sales plus desired ending inventory minus beginning inventory.
- From production, derive the materials, labour, and overhead the year will consume — and the ending inventory it will leave.
- Feed all of that into the cash budget to time the cash in and out, month by month.
- Assemble the budgeted income statement and budgeted balance sheet, and confirm the balance sheet balances.
Because the links are so tight, the master budget is rarely a one-pass document. Change the sales forecast and the whole cascade re-flows; tighten the inventory cushion and production, purchasing and cash all shift. Spreadsheets made this iteration cheap, which is a blessing and a trap — it is easy to tweak a number and forget which downstream pages it silently changed. The discipline of the chain is exactly what protects you: if you respect the order, every change finds its way correctly to the final balance sheet, and that balance sheet's balancing is your check that you did not break a link.
Who holds the pen: participative versus top-down
A master budget is not only a set of equations; it is also a political act, because the numbers in it become the standards people will later be judged against. So *who sets the numbers* matters as much as the numbers themselves. At one extreme, top-down (or *imposed*) budgeting has senior management set the targets and hand them down. It is fast and keeps everyone pointed at the same corporate goals, but the people on the ground may see the targets as unrealistic, feel no ownership, and quietly stop believing in a plan they had no hand in.
At the other extreme, [[participative-budgeting|participative budgeting]] (or *bottom-up*) invites the managers who will actually live under the budget to help build it. The salesperson who knows the territory shapes the sales budget; the plant manager who knows the machines shapes the production budget. People defend plans they helped write, so motivation and the quality of the local knowledge both rise. The honest cost is twofold: it is slower and more negotiation-heavy, and it tempts *budgetary slack* — the natural urge to lowball your sales target and pad your expense budget so the goal is comfortably easy to beat. Most real organizations blend the two: top management frames the overall goals, lower levels build the detailed budgets within that frame, and the two are reconciled in negotiation.