Zero Based Budgeting is a budgeting technique in which every budget is prepared from a “zero base”, meaning previous year’s figures are not taken as a starting point or automatically carried forward. Instead, each activity, function, or department must justify its entire budget afresh, as if operating for the first time, by demonstrating the necessity and cost-benefit of every proposed expenditure. Developed by Peter A. Pyhrr at Texas Instruments in the early 1970s, ZBB requires managers to evaluate alternative ways of performing activities and rank them through decision packages based on priority. This approach helps eliminate wasteful, obsolete, or unjustified expenditure that traditional incremental budgeting tends to perpetuate, thereby promoting cost consciousness and efficient resource allocation.
Evolution of Zero Based Budgeting:
Zero Based Budgeting (ZBB) originated from the need to improve traditional budgeting systems, which generally used the previous year’s budget as the starting point. The concept was developed by Peter A. Pyhrr during the late 1960s while working at Texas Instruments in the United States. Pyhrr introduced the approach to overcome the limitations of incremental budgeting, where existing expenses were automatically continued with adjustments. Under ZBB, every activity and expenditure must be justified from the beginning, as though no previous budget existed. The approach received wider attention after Pyhrr published his work on Zero Based Budgeting in 1970, explaining its principles and practical application.
The concept gained greater recognition when President Jimmy Carter introduced Zero Based Budgeting in the U.S. Federal Government during the late 1970s. It was adopted to improve government expenditure control, prioritise activities, and eliminate unnecessary spending. Although its application in government faced practical difficulties, ZBB continued to develop in business organisations and other institutions as a tool for cost control and resource allocation. Over time, organisations adapted the approach to suit their own requirements, focusing on reviewing activities, evaluating alternatives, and allocating resources according to priorities. Today, ZBB is used selectively by organisations seeking greater cost efficiency, expenditure discipline, and better financial decision making.
Core Principles of Zero Based Budgeting:
1. Zero Base Approach
The basic principle of Zero Based Budgeting is that every budgeting period begins with a zero base. Unlike traditional budgeting, the previous year’s expenditure is not automatically accepted as the starting point. Every activity must be reviewed and justified before funds are allocated. This approach requires managers to examine whether each activity is necessary, useful, and economically justified. Existing activities receive funds only when their continuation is supported by proper analysis. The zero base approach prevents the automatic continuation of outdated or unnecessary expenditure and encourages organisations to use their available financial resources more efficiently.
2. Justification of Every Activity
Under Zero Based Budgeting, every activity and expenditure must be justified before it is included in the budget. Managers cannot assume that existing activities should automatically continue because they were included in previous budgets. Each activity is examined according to its purpose, expected benefits, costs, and contribution to organisational objectives. This principle encourages managers to question unnecessary activities and identify areas where expenditure can be reduced. Proper justification ensures that available funds are directed towards activities that provide meaningful benefits. It therefore promotes financial discipline, accountability, and effective resource allocation.
3. Decision Packages
A major principle of ZBB is the preparation of decision packages. A decision package contains information about a specific activity, including its objectives, costs, expected benefits, alternatives, and consequences of not undertaking it. Managers prepare these packages so that activities can be evaluated systematically. Each package represents a separate proposal for funding and is considered on its own merits. Management can compare different packages and decide which activities deserve priority. This approach improves transparency in budgeting and helps management allocate resources according to organisational priorities and expected benefits.
4. Ranking of Activities
Zero Based Budgeting requires activities to be ranked according to their importance and priority. After preparing decision packages, management evaluates and ranks them based on factors such as organisational objectives, expected benefits, costs, urgency, and available resources. High priority activities receive funding before activities of lower importance. This becomes particularly useful when financial resources are limited. Ranking ensures that scarce resources are directed towards activities that contribute most significantly to organisational goals. It also helps management make informed choices between competing activities and improves the effectiveness of budget allocation.
5. Cost Benefit Analysis
Cost benefit analysis is an important principle of Zero Based Budgeting. Each activity is evaluated by comparing the resources required with the benefits expected from it. Management examines whether the proposed expenditure is justified by the results or value that the activity is likely to generate. Activities involving high costs and limited benefits may be reduced, modified, or discontinued. This analysis encourages managers to focus on economically beneficial activities. It helps prevent unnecessary expenditure and supports better financial decisions. Therefore, cost benefit analysis promotes economical use of resources and improved organisational efficiency.
6. Resource Allocation According to Priorities
ZBB focuses on allocating resources according to current priorities rather than past expenditure. Funds are provided to activities after evaluating their importance, benefits, and contribution to organisational objectives. An activity that received a large budget in the previous year does not automatically receive the same amount in the current year. Similarly, a new activity may receive funds if it has greater priority and potential benefits. This principle helps management direct limited financial resources towards the most important activities. It promotes flexibility, efficiency, and priority based financial planning.
7. Continuous Review
Zero Based Budgeting involves the regular review of activities and expenditure. Managers are expected to examine whether activities continue to be necessary and whether their costs remain justified. Changes in organisational objectives, market conditions, technology, and resource availability may affect the importance of different activities. Continuous review helps management identify activities that have become outdated or inefficient. It also provides opportunities to modify or discontinue activities when required. Therefore, continuous review ensures that the budget remains relevant and supports effective cost control and changing organisational requirements.
Assumptions of Zero Based Budgeting:
1. Every Activity Requires Justification
Zero Based Budgeting assumes that every activity must be justified before funds are allocated. Previous approval of an activity does not guarantee its continuation in the current budget period. Managers must explain the purpose, necessity, expected benefits, and cost of each activity. This assumption ensures that expenditure is not continued merely because it existed in the previous year. Activities that no longer contribute to organisational objectives may be reduced or discontinued. Therefore, ZBB assumes that past expenditure has no automatic claim on future funds, and every proposed expenditure should receive fresh consideration.
2. Resources Are Limited
ZBB assumes that an organisation has limited financial and other resources and therefore cannot fund every activity at the desired level. Management must identify activities that deserve greater priority and allocate available resources accordingly. Decision packages are evaluated and ranked to determine which activities should receive funding. This assumption encourages managers to make choices between competing requirements and focus on activities that provide greater benefits. Limited resources therefore require priority based budgeting rather than automatic continuation of previous expenditure. This helps organisations achieve their objectives within available financial constraints.
3. Activities Can Be Evaluated Separately
Zero Based Budgeting assumes that organisational activities can be identified and evaluated separately. Each activity can be presented as a decision package containing information about its objectives, costs, benefits, and alternatives. Management can then assess the importance and efficiency of each activity independently. This makes it easier to identify activities that are unnecessary, overlapping, or inefficient. Separate evaluation also allows management to compare different activities competing for the same resources. Thus, ZBB assumes that individual activities can be measured, analysed, and prioritised for effective resource allocation.
4. Alternative Methods Are Available
ZBB assumes that there may be different ways of achieving organisational objectives. Managers therefore consider alternative methods, levels of service, technologies, or processes before deciding the amount of resources required. An activity does not necessarily need to continue in its existing form if a more economical alternative is available. Comparing alternatives helps management identify methods that provide similar or greater benefits at lower costs. This assumption encourages cost effectiveness and innovation in organisational activities. It also prevents managers from accepting existing methods without examining whether better alternatives can achieve the same objectives.
5. Management Can Establish Priorities
ZBB assumes that management has the ability to identify and establish priorities among different activities. Since resources are limited, activities cannot all receive equal funding. Managers evaluate decision packages according to their importance, expected benefits, urgency, and contribution to organisational objectives. Higher priority activities receive resources before lower priority activities. This requires managers to understand organisational goals and make objective comparisons. The assumption ensures that budgeting becomes a priority based process rather than a simple continuation of historical expenditure. It helps direct resources towards activities that contribute most effectively to organisational performance.
6. Costs and Benefits Can Be Estimated
Zero Based Budgeting assumes that the costs and expected benefits of activities can be reasonably estimated. Managers need information about the resources required to perform an activity and the results expected from it. These estimates allow different decision packages to be compared and ranked. Although exact measurement may not always be possible, reasonable estimates provide a useful basis for decision making. This assumption makes cost benefit analysis an important part of ZBB. Reliable estimates help management identify economically desirable activities and avoid allocating resources to activities where expected benefits do not justify their costs.
7. Budgeting Is a Continuous Management Process
ZBB assumes that budgeting should be treated as a regular management process, not merely an annual accounting exercise. Activities, costs, priorities, and organisational objectives may change over time. Therefore, management needs to review expenditure and activities regularly to ensure that resources continue to be used effectively. Continuous review helps identify outdated activities, changing requirements, and opportunities for cost reduction. This assumption encourages ongoing cost control and performance evaluation. It ensures that the budget remains aligned with current organisational needs rather than depending entirely on decisions made during previous budgeting periods.
Process of Preparing Zero Based Budget:
1. Identification of Activities
The first step in preparing a Zero Based Budget is to identify all activities performed by the organisation. Each department reviews its functions, programmes, projects, and services and identifies the activities requiring financial resources. Existing activities are not automatically accepted merely because they were included in the previous budget. Management examines whether each activity is still necessary and contributes to organisational objectives. Activities are clearly defined so that their costs and expected benefits can be evaluated separately. Proper identification provides the foundation for preparing decision packages and ensures that no significant activity is overlooked during the budgeting process.
2. Preparation of Decision Packages
After identifying activities, managers prepare decision packages for each activity. A decision package provides important information such as the activity’s objectives, resources required, estimated costs, expected benefits, alternative methods, and consequences of discontinuing the activity. It may also describe different levels of operation, such as minimum, normal, and expanded service levels. Each package is prepared independently so that management can evaluate it without relying on previous budgets. Decision packages provide a systematic basis for comparing activities and determining which activities should receive financial support. They are therefore a central part of the Zero Based Budgeting process.
3. Evaluation of Decision Packages
The prepared decision packages are carefully evaluated by management. Each activity is examined in terms of its necessity, cost, expected benefits, efficiency, and contribution towards organisational objectives. Management may compare alternative methods of performing the same activity and determine which option provides the greatest value. Activities that appear unnecessary, inefficient, or costly may be modified or eliminated. Evaluation should be based on reliable information and reasonable estimates. This step helps management distinguish between essential and less important activities and provides a sound basis for deciding the amount of resources required by each activity.
4. Ranking of Decision Packages
After evaluation, decision packages are ranked according to priority. Management compares the relative importance, costs, benefits, urgency, and contribution of different activities. Essential activities that directly support organisational objectives generally receive higher rankings, while activities with limited benefits may receive lower rankings. Ranking is particularly important when available financial resources are insufficient to fund all proposed activities. It enables management to allocate funds according to organisational priorities rather than historical expenditure. Proper ranking ensures that scarce resources are directed towards activities that provide the greatest contribution to organisational performance and objectives.
5. Allocation of Resources
Once decision packages have been ranked, available financial resources are allocated according to their priority. Higher ranked activities are considered first, while lower ranked activities receive funds only if sufficient resources remain. Management determines the appropriate level of expenditure for each approved activity. The allocation may also consider different service levels and alternative methods. This process ensures that resources are not distributed automatically on the basis of previous budgets. Instead, funds are directed towards activities that have been properly justified. Resource allocation therefore promotes economical expenditure, financial discipline, and effective utilisation of organisational resources.
6. Preparation of Final Budget
After resources are allocated, the approved decision packages are combined to prepare the final Zero Based Budget. The budget presents the expenditure requirements of different departments, activities, and programmes for the coming period. It includes only those activities that management has approved after evaluation and prioritisation. The final budget is reviewed to ensure that total proposed expenditure remains within the available financial resources. Necessary adjustments may be made before final approval. The completed budget becomes a financial plan for the organisation and provides a basis for expenditure control, performance monitoring, and managerial decision making.
7. Implementation and Review
The final step is the implementation and continuous review of the Zero Based Budget. Approved funds are provided to departments according to the budget, and actual expenditure is monitored throughout the period. Management compares actual performance and expenditure with the approved budget to identify significant variations. Activities may be reviewed when circumstances, organisational objectives, or resource requirements change. Corrective measures can be taken where necessary. Regular review ensures that funds continue to be used efficiently and that activities remain justified. Thus, implementation and review help maintain cost control, accountability, and effective financial management.
Advantages of Zero Based Budgeting:
1. Effective Cost Control
Zero Based Budgeting helps organisations achieve effective cost control by requiring every activity and expenditure to be justified. Previous expenditure is not automatically carried forward into the new budget. Managers carefully examine whether each expense is necessary and whether it provides sufficient benefits. Unnecessary, outdated, or inefficient activities can be reduced or eliminated. This process helps prevent wasteful spending and encourages departments to operate economically. Regular evaluation of costs also makes managers more conscious of resource utilisation. Therefore, ZBB provides a systematic approach to controlling expenditure and improving the overall financial efficiency of the organisation.
2. Elimination of Unnecessary Activities
A major advantage of ZBB is its ability to identify and eliminate unnecessary or outdated activities. Under traditional budgeting, activities may continue simply because they were included in previous budgets. ZBB requires every activity to be reconsidered and justified during each budgeting period. Management evaluates whether an activity still contributes to organisational objectives and whether its benefits justify its cost. Activities that have become irrelevant, inefficient, or duplicated can be discontinued. This prevents organisations from spending resources on activities that provide limited value and helps ensure that available funds are directed towards important and productive activities.
3. Efficient Resource Allocation
ZBB promotes efficient allocation of resources by distributing funds according to current priorities rather than previous expenditure. Decision packages are evaluated and ranked according to their importance, costs, expected benefits, and contribution to organisational objectives. Higher priority activities receive resources before lower priority activities. This is particularly useful when financial resources are limited. The approach ensures that money, manpower, and other resources are directed towards activities that provide greater organisational benefits. Thus, ZBB helps management achieve better results from available resources and supports priority based financial planning and resource utilisation.
4. Better Managerial Decision Making
Zero Based Budgeting provides managers with detailed information about activities, costs, alternatives, and expected benefits. This information helps management make more rational and informed decisions regarding resource allocation. Managers can compare different activities and determine which alternatives provide greater benefits at reasonable costs. The process also encourages managers to examine the necessity and efficiency of existing activities. As a result, decisions are based on current requirements rather than assumptions from previous budgets. Therefore, ZBB improves the quality of financial, operational, and strategic managerial decisions.
5. Increased Managerial Accountability
ZBB increases managerial accountability because managers are required to justify the activities and expenditure proposed by their departments. Each manager must explain the purpose, cost, expected benefits, and resource requirements of activities under their responsibility. This creates greater awareness of how departmental resources are being used. Managers become more responsible for achieving planned results within approved resources. The evaluation and ranking process also makes departmental priorities more transparent. Therefore, ZBB strengthens responsibility, accountability, and financial discipline throughout the organisation.
6. Improved Budgetary Planning
ZBB improves budgetary planning by requiring management to examine activities and expenditure from the beginning of each budgeting period. Instead of simply increasing or decreasing the previous year’s budget, managers prepare fresh estimates based on current requirements. This provides a more realistic picture of future financial needs. Changes in organisational objectives, technology, market conditions, and operational requirements can be considered while preparing the budget. Better planning helps prevent excessive allocation of funds and improves coordination between departments. Thus, ZBB contributes to realistic budgeting and improved financial planning.
7. Encourages Cost Consciousness
Zero Based Budgeting develops greater cost consciousness among managers and employees. Since every expenditure must be justified, departments become more aware of the financial consequences of their activities. Managers are encouraged to examine whether resources are being used efficiently and whether alternative methods can reduce costs. This creates a culture in which unnecessary spending is questioned and economical practices are encouraged. Employees become more conscious of controlling wastage and improving efficiency. Therefore, ZBB promotes financial discipline and economical behaviour across different levels of the organisation.
Limitations and Challenges of Zero Based Budgeting:
1. Time Consuming Process
One major limitation of Zero Based Budgeting is that it is a time consuming process. Unlike traditional budgeting, every activity and expenditure must be examined and justified from the beginning. Managers need to prepare detailed decision packages, estimate costs and benefits, evaluate alternatives, and rank activities. This requires considerable time from managers and employees. In large organisations with many departments and activities, the process can become particularly lengthy. The additional time required may increase administrative work and delay budget preparation. Therefore, ZBB may be difficult to implement frequently where quick budgeting decisions are required.
2. High Administrative Cost
Zero Based Budgeting may involve high administrative costs because of the detailed analysis required for each activity. Organisations need managers, accountants, analysts, and other employees to prepare and evaluate decision packages. Collecting information about costs, benefits, alternatives, and expected results also requires additional effort. In large organisations, hundreds or thousands of activities may need to be reviewed. The cost of conducting such an extensive budgeting exercise may sometimes be significant. Therefore, the organisation must consider whether the expected benefits from ZBB are sufficient to justify the additional administrative and operational costs involved.
3. Difficulty in Measuring Benefits
A significant challenge of ZBB is the difficulty of measuring benefits for certain activities. Some activities, particularly administrative, social, educational, or support activities, may not generate benefits that can be expressed easily in monetary terms. For example, employee training, customer service, and welfare activities may provide long term benefits that are difficult to quantify. This can make comparison and ranking of decision packages difficult. Managers may therefore rely on subjective judgments while evaluating activities. Difficulty in measuring benefits can affect the accuracy of resource allocation and priority setting under Zero Based Budgeting.
4. Resistance to Change
Employees and managers may show resistance to Zero Based Budgeting because it requires them to justify existing activities and expenditure. Departments may fear that their budgets could be reduced or that certain activities could be discontinued. Managers who are accustomed to traditional budgeting may find the new approach difficult to accept. Resistance may result in incomplete information, weak justification, or lack of cooperation during the budgeting process. Successful implementation therefore requires effective communication, management support, and employee participation. Without adequate cooperation, the effectiveness of ZBB may be reduced significantly.
5. Complexity in Large Organisations
Implementing ZBB can be complex in large organisations because they may have numerous departments, programmes, activities, and cost centres. Preparing and evaluating a large number of decision packages requires substantial information, coordination, and managerial effort. Different departments may also have different objectives and methods of operation, making comparison difficult. Maintaining consistency in evaluation and ranking can become challenging. The large volume of information may further increase the administrative burden. Therefore, although ZBB can provide detailed financial control, its implementation may become complicated where the organisation has large scale and diversified operations.
6. Possibility of Subjective Judgement
Zero Based Budgeting involves evaluating and ranking activities, which may sometimes depend on managerial judgement. Managers may have different opinions regarding the importance, costs, and expected benefits of activities. Personal preferences, departmental interests, or organisational relationships may influence the ranking of decision packages. Such subjectivity can result in some activities receiving resources despite having lower actual priority, while others may receive inadequate funding. Reliable data and clear evaluation criteria can reduce this problem. However, complete objectivity may not always be possible, making fair evaluation and resource allocation a challenge under ZBB.
7. Difficulty in Frequent Application
Zero Based Budgeting is generally difficult to apply frequently or continuously because of the extensive analysis required. Every budgeting cycle involves identification of activities, preparation of decision packages, evaluation, ranking, and resource allocation. Repeating the entire process regularly may place considerable pressure on managers and employees. For this reason, some organisations may use ZBB selectively for particular departments, activities, or periods rather than applying it fully every year. The challenge is to obtain the benefits of detailed cost review without creating excessive administrative work. Thus, frequent application may be costly and demanding for organisations.
Example of Zero Based Budgeting:
Suppose ABC Ltd. is preparing its budget for the next financial year. Instead of automatically increasing the previous year’s expenditure, the company starts with a zero base and reviews each activity. The management identifies three activities: employee training, advertising, and office maintenance. Each activity is evaluated based on its cost and expected benefits.
Step 1: Preparation of Decision Packages
| Activity |
Estimated Cost ₹ |
Expected Benefit |
Priority |
| Employee Training |
2,00,000 |
High |
1 |
| Advertising |
3,00,000 |
Medium |
2 |
| Office Maintenance |
1,50,000 |
Low |
3 |
Step 2: Resource Allocation
The company has only ₹4,00,000 available for these activities. Based on their priority, the management approves:
| Activity |
Proposed Cost ₹ |
Approved Cost ₹ |
| Employee Training |
2,00,000 |
2,00,000 |
| Advertising |
3,00,000 |
2,00,000 |
| Office Maintenance |
1,50,000 |
Nil |
| Total |
6,50,000 |
4,00,000 |
Thus, ZBB ensures that funds are allocated according to priority and expected benefits, rather than simply continuing previous expenditure.
Accounting Entries
The following entries may be recorded when the approved expenditure is incurred:
| Transaction |
Journal Entry |
| Training expenses paid |
Training Expenses A/c Dr. ₹2,00,000 →
To Cash/Bank A/c ₹2,00,000 |
| Advertising expenses paid |
Advertising Expenses A/c Dr. ₹2,00,000 →
To Cash/Bank A/c ₹2,00,000 |
| Maintenance expenses not approved |
No Entry |
Note: Zero Based Budgeting itself does not require a special journal entry. The entries are made when the approved budgeted activities are actually carried out and expenses are incurred.
by