The Predetermined Overhead Rate Is Usually Calculated At The

Use this calculator to determine the Predetermined Overhead Rate (POHR), often calculated at the beginning of an accounting period to apply overhead costs to jobs or products. This rate helps in budgeting, pricing, and cost control.

Formula Explanation

The Predetermined Overhead Rate (POHR) is calculated using the following formula:

POHR = Total Estimated Overhead Costs / Total Estimated Allocation Base Amount

This rate is then applied to actual jobs or products based on the actual amount of the allocation base used. For example, if the POHR is $5 per direct labor hour, and a job uses 10 direct labor hours, $50 of overhead is applied to that job.

Predetermined Overhead Rate (POHR) Calculation Components

Component	Meaning	Unit	Estimated Value
Estimated Total Overhead Costs	Total indirect costs anticipated for the period.	Currency	—
Total Estimated Allocation Base Amount	Total anticipated usage of the chosen cost driver (e.g., labor hours, machine hours).	—	—
Predetermined Overhead Rate (POHR)	Rate applied to allocate overhead to cost objects.	Rate (Currency / Base Unit)	—

The predetermined overhead rate (POHR) is a crucial accounting tool used by businesses to allocate manufacturing or service overhead costs to cost objects, such as products, projects, or services, in advance of the accounting period. Instead of waiting until the end of the period to calculate actual overhead and then allocate it (which can be too late for timely decision-making), businesses estimate their total overhead costs and the total amount of an allocation base (cost driver) they expect to use. This estimated rate is then used throughout the period to apply overhead costs consistently.

Who Should Use It?

• Manufacturing companies tracking product costs.
• Service-based businesses allocating indirect costs to client projects.
• Construction companies managing project profitability.
• Any organization needing to accurately cost jobs or products for pricing, budgeting, and performance evaluation.

Common Misunderstandings

• POHR vs. Actual Overhead Rate: The POHR is an estimate; the actual overhead rate is calculated retrospectively. Significant differences (variances) between applied overhead (using POHR) and actual overhead often require investigation.
• Choosing the Right Allocation Base: The effectiveness of the POHR heavily depends on selecting an appropriate allocation base that has a strong correlation with the incurrence of overhead costs. Using an unsuitable base can lead to inaccurate costing and poor decisions.
• Static Nature: While calculated periodically (e.g., annually), the POHR is assumed to be constant throughout the period. Major shifts in business operations or cost structures might necessitate recalculating the rate mid-period.

Predetermined Overhead Rate (POHR) Formula and Explanation

The fundamental formula for calculating the Predetermined Overhead Rate (POHR) is straightforward:

POHR Formula

POHR = Total Estimated Overhead Costs / Total Estimated Allocation Base Amount

Let's break down the components:

• Total Estimated Overhead Costs: This is the sum of all indirect costs anticipated to be incurred during the accounting period. These are costs not directly traceable to a specific product or service but are necessary for overall operations.
• Total Estimated Allocation Base Amount: This is the total expected activity level of the chosen cost driver for the period. The allocation base is the measure of activity that is believed to cause overhead costs to be incurred.

Variables Table

POHR Calculation Variables

Variable	Meaning	Unit	Typical Range/Example
Total Estimated Overhead Costs	Sum of all anticipated indirect costs (rent, utilities, salaries, depreciation, etc.).	Currency (e.g., USD, EUR)	$500,000 – $2,000,000+
Total Estimated Allocation Base Amount	Total anticipated level of the chosen cost driver.	Depends on base (e.g., Hours, Kilograms, Units, Currency).	10,000 Direct Labor Hours, 5,000 Machine Hours, $1,000,000 Direct Labor Costs, 20,000 Units Produced.
Predetermined Overhead Rate (POHR)	The rate used to apply overhead to cost objects.	Currency / Unit of Allocation Base (e.g., $/Hour, $/Unit)	$25/Direct Labor Hour, $10/Machine Hour, 50% of Direct Labor Cost, $5/Unit Produced.

The key is to select an allocation base that has a strong causal relationship with overhead costs. Common bases include direct labor hours, machine hours, direct labor costs, or units produced.

Practical Examples of POHR Calculation

Understanding the POHR calculation is best done through examples.

Example 1: Manufacturing Company (Direct Labor Hours)

A furniture manufacturer estimates the following for the upcoming year:

• Total Estimated Overhead Costs: $750,000
• Total Estimated Direct Labor Hours: 50,000 hours

Calculation:

POHR = $750,000 / 50,000 hours = $15 per direct labor hour

Application: If a specific table requires 8 direct labor hours to manufacture, the company will apply $15/hour * 8 hours = $120 in overhead costs to that table.

Example 2: Service Company (Billable Hours)

A consulting firm estimates its total annual overhead costs (rent, admin salaries, software, etc.) at $1,200,000. They expect to bill clients for a total of 60,000 hours during the year.

Calculation:

POHR = $1,200,000 / 60,000 billable hours = $20 per billable hour

Application: A project that requires 150 billable hours will have $20/hour * 150 hours = $3,000 in overhead costs allocated to it.

Example 3: Using Direct Labor Cost as Base

A small workshop estimates $150,000 in overhead costs and $250,000 in direct labor costs for the year.

Calculation:

POHR = $150,000 / $250,000 = 0.60 or 60%

Application: A job with $5,000 in direct labor costs would be allocated 0.60 * $5,000 = $3,000 in overhead.

How to Use This Predetermined Overhead Rate Calculator

This calculator simplifies the process of finding your POHR. Follow these steps:

1. Estimate Total Overhead Costs: Sum up all your anticipated indirect costs for the period. This includes rent, utilities, administrative salaries, insurance, depreciation on equipment not tied to direct production, etc. Enter this amount in the "Estimated Total Overhead Costs" field.
2. Choose Your Allocation Base: Decide which activity best drives your overhead costs. Common choices are direct labor hours, machine hours, direct labor cost, or the number of units produced. Select your chosen base from the "Allocation Base Unit" dropdown.
3. Estimate Total Allocation Base Amount: Project the total amount of your chosen allocation base you expect to use during the period. For instance, if you chose direct labor hours, estimate the total number of hours your workforce will spend on production-related activities. Enter this in the "Total Estimated Allocation Base Amount" field.
4. Calculate: Click the "Calculate POHR" button.
5. Interpret Results:
   • The calculator will display your POHR, which is the rate in currency per unit of your chosen allocation base.
   • It also shows the "Rate per Unit of Allocation Base" (which is essentially the POHR itself but phrased for clarity).
   • If you have an idea of how much of the allocation base a specific job or product uses, you can mentally apply the rate. For example, if your POHR is $25/hour and a job uses 10 hours, $250 of overhead is applied. The calculator also provides estimates for "Total Overhead Applied" and "Applied Overhead per Unit" if you input a specific usage of the allocation base.
6. Reset: If you need to start over or try different estimates, click the "Reset" button.
7. Copy Results: Use the "Copy Results" button to quickly grab the calculated figures for documentation or reports.

Selecting Correct Units: The "Allocation Base Unit" dropdown is critical. Ensure it matches the denominator in your POHR calculation. The calculator will adjust its output labels accordingly. For example, if you choose "Machine Hours," the rate will be displayed as "Dollars per Machine Hour."

Key Factors That Affect Predetermined Overhead Rate

Several factors influence the calculation and final value of your POHR. Understanding these can help in making more accurate estimates and managing overhead costs effectively:

1. Accuracy of Overhead Cost Estimates: The most direct impact comes from the estimated total overhead costs. If these are underestimated, the POHR will be too low, leading to under-allocation of overhead. Overestimating leads to an excessively high rate. Detailed budgeting and historical analysis are key.
2. Selection of Allocation Base: Choosing a base that doesn't correlate well with overhead incurrence is a major issue. For example, using units produced when machine usage (and thus overhead like electricity and maintenance) varies significantly by product complexity can distort costs. A more appropriate base (like machine hours) would yield a more accurate POHR.
3. Volume of Allocation Base Activity: If the total estimated activity level (e.g., total direct labor hours) changes significantly from expectations, the POHR will be affected. A higher denominator results in a lower rate, and vice versa, assuming overhead costs remain constant.
4. Changes in Production Processes: Automation can shift overhead from direct labor costs to machine-related costs (electricity, depreciation, maintenance). If the allocation base remains direct labor hours, the POHR might become inaccurate. Adjusting the base or overhead cost categories is necessary.
5. Economic Conditions and Inflation: Fluctuations in the cost of utilities, raw materials (indirectly), and labor can significantly impact total overhead costs. Higher inflation generally leads to higher overhead costs and thus a higher POHR.
6. Operational Efficiency Improvements: Implementing lean manufacturing or improving process efficiency can reduce the amount of the allocation base needed per unit or job. If overhead costs don't decrease proportionally, the POHR might increase.
7. Fixed vs. Variable Overhead Mix: A higher proportion of fixed overhead costs means the POHR is more sensitive to changes in the allocation base volume. Variable overheads tend to move more directly with activity levels.
8. Accounting Period Length: While usually annual, if a shorter period is used, seasonal variations in overhead or activity need careful consideration to avoid distortion.

Frequently Asked Questions (FAQ) About POHR

Q1: What is the main purpose of a predetermined overhead rate?

A1: Its main purpose is to allocate overhead costs to products or services in a timely manner throughout the accounting period, enabling better costing, pricing, and decision-making before the period closes.

Q2: How often should the POHR be recalculated?

A2: Typically, the POHR is calculated once per accounting period (e.g., annually). However, if significant changes in cost structure or activity levels are anticipated, it may be recalculated quarterly or even mid-period.

Q3: What happens if the actual overhead costs differ significantly from the estimated costs?

A3: This results in an overhead variance (underapplied or overapplied overhead). The difference is usually adjusted at the end of the period by closing it to Cost of Goods Sold, or prorated among Work-in-Process, Finished Goods, and Cost of Goods Sold if the variance is material.

Q4: Can I use different allocation bases for different departments?

A4: Yes, many companies use departmental overhead rates with different allocation bases for each department to achieve more accurate costing, especially if departments have different cost drivers and overhead structures.

Q5: What is the best allocation base to use?

A5: The "best" base is the one that has the strongest correlation with the overhead costs incurred. For companies with significant direct labor, direct labor hours or cost might be suitable. For highly automated plants, machine hours or throughput might be better. Cost-benefit analysis often guides this decision.

Q6: Does the POHR include direct material or direct labor costs?

A6: No. The POHR is specifically for allocating *indirect* costs (overhead). Direct materials and direct labor are traced directly to the cost object and are not part of the overhead pool.

Q7: How does POHR relate to job costing vs. process costing?

A7: In job costing, the POHR is applied to individual jobs based on the specific amount of the allocation base each job uses. In process costing, the POHR is typically averaged over all units produced within a department during the period.

Q8: What are the risks of using an inaccurate POHR?

A8: Using an inaccurate POHR can lead to incorrect product/service pricing, distorted profitability analysis, poor inventory valuation, and flawed decisions regarding resource allocation or process improvements.