Farm budgeting: partial, enterprise and whole-farm
How farmers test decisions before acting: enterprise budgets and gross margins, partial budgets, whole-farm and cash flow budgets, and break-even sums.
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Should a farmer replace wheat with onions on two hectares? Buy a tractor or keep hiring one? Add a dairy unit? Install drip irrigation? Each decision changes some costs and some returns, and each carries risk. Budgeting sets out the expected costs and returns on paper before the farmer commits money and land, so that good decisions can be made and bad ones avoided.
Farm budgeting techniques are a core part of farm management courses and exams, almost always with calculations.
Types of farm budget
- Enterprise budget: estimated costs and returns for one enterprise, such as a hectare of maize or a dairy cow, for one production cycle.
- Partial budget: compares the farm with and without a single change, counting only what changes.
- Whole-farm budget: a plan for the entire farm for a year or more, combining all enterprises, fixed costs and family needs.
- Cash flow budget: shows when money comes in and goes out, month by month, so the farmer can plan credit.
- Capital budget: evaluates long-term investments using discounting (see the article on time value of money).
Enterprise budgets and gross margins
The gross margin of an enterprise is its gross income minus its variable costs. Fixed costs, such as machinery depreciation and land rent, are left out, because they are shared and do not change when the mix of enterprises changes in the short run.
| Per hectare | Wheat | Onion |
|---|---|---|
| Gross income | 5 t × 230 = 1,150 + straw 100 = 1,250 | 25 t × 150 = 3,750 |
| Variable costs (seed or seedlings, fertiliser, sprays, hired labour, irrigation, curing) | 600 | 2,400 |
| Gross margin | 650 | 1,350 |
Gross margins let a farmer compare enterprises quickly and rank them by gross margin per unit of the scarcest resource, such as per hectare, per day of family labour or per cubic metre of water.
Partial budgeting
A partial budget asks: what changes if I make this one change? It has four parts.
Partial budgets are used to assess substituting one crop or enterprise for another, adopting a new technology, buying versus hiring machinery, or changing the scale of an enterprise.
Replacing wheat with onion on 2 hectares
Using the gross margins above, for 2 ha:
A. Added returns: onion income = 2 × 3,750 = 7,500. B. Reduced costs: wheat costs saved = 2 × 600 = 1,200. C. Added costs: onion costs = 2 × 2,400 = 4,800. D. Reduced returns: wheat income given up = 2 × 1,250 = 2,500.
- Gains = 7,500 + 1,200 = 8,700; losses = 4,800 + 2,500 = 7,300.
- Net change in profit = 8,700 − 7,300 = +1,400 dollars.
Break-even price. At what onion price would the change make no difference? Onion income must fall by 1,400, to 6,100, so the price must be 6,100 ÷ 50 t = 122 dollars per tonne. If onion prices often fall below about 120 dollars, the change is risky.
Break-even yield at 150 dollars per tonne: 6,100 ÷ 150 ≈ 40.7 t over 2 ha, about 20.3 t/ha.
The partial budget also prompts non-money questions: does the family have labour for transplanting and harvest? Is there storage and a buyer for 50 t of onions?
Whole-farm budgeting
A whole-farm budget combines all enterprises with fixed costs, family living expenses, loan repayments and investment plans. Steps:
- Inventory of resources: land, labour, water, machinery, buildings, capital and skills.
- Choose enterprises and their scale, often guided by gross margins per unit of limiting resource. Linear programming finds the combination that maximises total gross margin within resource limits.
- Total gross margin of the plan minus fixed costs gives net farm income.
- Test the plan against risk: what if prices or yields fall?
Cash flow budgets
A farm can be profitable over the year and still run out of cash in the months before harvest. A cash flow budget lists expected receipts and payments each month, revealing when credit is needed and when it can be repaid. Lenders usually ask for one.
Buying or hiring a machine
A common budgeting question is whether to buy a machine or hire one. Ownership has mostly fixed costs (depreciation, interest, insurance and housing), plus variable costs of fuel, repairs and labour per hectare. Hiring has only a per-hectare charge.
The break-even area is the area at which owning and hiring cost the same:
- Suppose a seed drill costs 1,800 dollars a year in fixed costs and 8 dollars per hectare to run, while hiring costs 26 dollars per hectare.
- Break-even area = fixed costs ÷ (hire charge − variable cost) = 1,800 ÷ (26 − 8) = 100 ha per year.
Below 100 ha a year, hiring is cheaper; above it, owning is cheaper, and ownership also brings timeliness, sowing at the best date, which can be worth more than the cost difference. Groups of small farmers often share machines or use custom-hiring centres for exactly this reason.
Limits of budgets
Budgets are only as good as their estimates. Use realistic, local yields and prices, include all costs that change, consider timing and risk, and update budgets with actual records. Sensitivity analysis, re-calculating results for lower prices or yields, shows how robust a decision is.
Key points
- Enterprise budgets give costs and returns for one activity; gross margin = gross income − variable costs.
- Partial budgets count only changes: (added returns + reduced costs) − (added costs + reduced returns).
- Break-even price or yield shows how much margin for error a change has.
- Whole-farm budgets combine enterprises, fixed costs and family needs; linear programming optimises the mix.
- Cash flow budgets show timing of money and credit needs.
- Always test budgets for risk with sensitivity analysis.
What the exams ask
- School-leaving and entrance papers: what farm budgeting is, and types of budgets.
- Degree and research-fellowship entrances: gross margins, partial budget format and calculations, whole-farm planning, linear programming principles, and cash flow budgets.
- Professional examinations: preparing budgets for loan proposals, comparing technologies, and break-even and sensitivity analysis.
Described in general terms: the kind of examination, not a past paper. Laisha never reproduces exam questions.
Questions people ask
Why leave fixed costs out of a gross margin?
They do not change when the farmer switches between enterprises in the short run. Including them would distort comparisons, because they must be paid whatever is grown.
Is a higher gross margin always better?
Not necessarily. An enterprise with a high gross margin may need more labour, capital or management, carry more price risk, or depend on markets that are hard to reach.
How is a partial budget different from a whole-farm budget?
A partial budget looks only at the effect of one change, holding everything else constant. A whole-farm budget plans the entire farm and its finances together.
Sources
- Kay, R. D., Edwards, W. M. and Duffy, P. A. Farm Management, 9th edition. McGraw-Hill, 2020.
- Dillon, J. L. and Hardaker, J. B. Farm Management Research for Small Farmer Development. FAO Agricultural Services Bulletin 41, 1993.
- Boehlje, M. D. and Eidman, V. R. Farm Management. Wiley, 1984.
- Hardaker, J. B., Lien, G., Anderson, J. R. and Huirne, R. B. M. Coping with Risk in Agriculture, 3rd edition. CABI, 2015.
- Olson, K. D. Farm Management: Principles and Strategies. Iowa State Press, 2004.
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