Job Order Costing
Costing for custom products.
Why This Matters
Some businesses make the same product over and over — a million identical coffee cups, a billion identical chips. Others make each product to the customer's specific requirements — a custom wedding cake, a bridge, a software platform, a film.
Job Order Costing is the costing system designed for the second type: businesses where each job, project, or batch is distinct enough to warrant its own cost record.
When a construction company builds a house, they need to know exactly what that house cost to build — not an average across all houses. When a law firm handles a case, every hour billed and every expense incurred must be tracked to that specific client matter. When a custom furniture maker builds a bespoke dining table, the cost of that table must be captured separately from every other piece in the shop.
Job order costing creates a separate cost record — the job cost sheet — for every unique job. It's the accounting equivalent of a receipt that accumulates the DM, DL, and applied overhead for one specific order from start to finish.
The Job Cost Sheet: The Core Document
The job cost sheet is the central record in job order costing. One sheet per job. It accumulates all costs until the job is complete.
JOB COST SHEET — ABC COFFEE SHOP
Job #: 2026-047
Customer: Downtown Hotel Chain
Description: Custom cold brew concentrate — 200-liter batch
Start Date: March 3, 2026 · Completion: March 5, 2026
DIRECT MATERIALS:
| Date | MR # | Description | Amount |
|---|---|---|---|
| 3/3/2026 | MR-1041 | Cold brew coffee | $84.00 |
| 3/3/2026 | MR-1042 | Filtered water | $12.00 |
| 3/4/2026 | MR-1043 | Custom bottles (200) | $62.00 |
| 3/4/2026 | MR-1044 | Branded labels | $18.00 |
| Total DM: | $176.00 | ||
DIRECT LABOR:
| Date | Employee | Hours | Rate | Amount |
|---|---|---|---|---|
| 3/3/2026 | J. Torres | 3.0 | $14/hr | $42.00 |
| 3/4/2026 | J. Torres | 2.5 | $14/hr | $35.00 |
| 3/5/2026 | M. Chen | 1.0 | $14/hr | $14.00 |
| Total DL: | 6.5 hrs | $91.00 | ||
MANUFACTURING OVERHEAD APPLIED:
POHR: $17.09/direct labor hour
Applied: 6.5 hrs × $17.09 = $111.09
TOTAL JOB COST: $176.00 + $91.00 + $111.09 = $378.09
Cost per liter: $378.09 ÷ 200 = $1.89/liter
Selling price to customer: $600.00
Gross profit on job: $600.00 − $378.09 = $221.91 (37%)
The Job Order Costing System: Full Flow
STEP 1: JOB OPENED
A new job is received. A job cost sheet is created. The job begins as Work in Process (WIP).
STEP 2: DIRECT MATERIALS CHARGED
Materials are requisitioned from the warehouse. Materials Requisition Form specifies: Job #, materials, quantity, cost.
DR Work in Process (Job #047) $176.00 · CR Raw Materials Inventory $176.00
STEP 3: DIRECT LABOR CHARGED
Workers track their time on time tickets specifying Job #.
DR Work in Process (Job #047) $91.00 · CR Wages Payable $91.00
STEP 4: OVERHEAD APPLIED
At the end of the period (or as work progresses): POHR × actual labor hours on this job.
DR Work in Process (Job #047) $111.09 · CR Manufacturing Overhead Applied $111.09
STEP 5: JOB COMPLETED
Job cost sheet is totaled. Costs move to Finished Goods.
DR Finished Goods Inventory $378.09 · CR Work in Process $378.09
STEP 6: JOB DELIVERED / SOLD
Costs move to Cost of Goods Sold. Revenue is recorded.
DR Cost of Goods Sold $378.09 · CR Finished Goods $378.09 · DR A/R $600.00 · CR Revenue $600.00
The WIP Ledger: Multiple Jobs Simultaneously
In real operations, many jobs are open at the same time. The WIP account in the general ledger represents ALL open jobs combined. The individual job cost sheets are the subsidiary ledger — together they reconcile to the WIP balance:
WIP SUBSIDIARY LEDGER (all open jobs):
Job #045 (large catering): DM $240 + DL $120 + MOH $204 = $564
Job #046 (office order): DM $48 + DL $28 + MOH $48 = $124
Job #047 (hotel chain): DM $176 + DL $91 + MOH $111 = $378
Total WIP balance: $1,066
WIP GENERAL LEDGER BALANCE: $1,066 ✓
Every dollar in the WIP account is accounted for on a specific job's cost sheet. This is the essential integrity check in job order costing.
Overhead: Actual vs. Applied
Overhead is applied during the year at the predetermined rate. At year-end, actual overhead is compared to applied overhead:
OVERHEAD RECONCILIATION — ABC COFFEE SHOP
Actual overhead incurred: $37,500 (unexpected repair costs in Q4)
Overhead applied (POHR): $36,305 ($17.09 × 2,125 actual hrs)
Underapplied overhead: $1,195
CAUSE: More overhead than expected was incurred. Every job had costs slightly understated.
DISPOSITION (small amount):
DR Cost of Goods Sold $1,195 · CR Manufacturing Overhead Applied $1,195
(COGS increases slightly — jobs were undercosted)
Large amount: Prorate across WIP, Finished Goods, and COGS
OVERAPPLIED: Applied > Actual → COGS was overstated → close to COGS with credit (reduces COGS)
REMEMBER: Underapplied → COGS UP (DR COGS) · Overapplied → COGS DOWN (CR COGS)
Job Order Costing in Service Industries
Job order costing is not just for manufacturers. Service firms use it extensively — they just call it differently:
Law Firm
Job = Client matter/case
DM ≈ Filing fees, research databases, travel
DL ≈ Attorney/paralegal hours × billing rate
OH ≈ Support staff, office, tech ÷ billable hours
"Bill" to client = job cost × markup factor
Advertising Agency
Job = Campaign or project
DM ≈ Media buys, printing, photography
DL ≈ Creative team hours, account manager hours
OH ≈ Studio rent, software, administrative support
Each campaign tracked as a separate job
Custom Home Builder
Job = One house (lot + plans + specs)
DM ≈ Lumber, concrete, fixtures, finishes
DL ≈ Carpenters, electricians, plumbers
OH ≈ Equipment, project management, site office
Total job cost vs. contracted price = profitability
Job Profitability Analysis
The real power of job order costing is the ability to analyze which jobs are profitable and which are not:
| Job # | Customer | Revenue | Job Cost | Margin | % |
|---|---|---|---|---|---|
| 045 | Corporate A | $850 | $564 | $286 | 33.6% |
| 046 | Office Park | $175 | $124 | $51 | 29.1% |
| 047 | Downtown Hotel | $600 | $378 | $222 | 37.0% |
| 048 | Event Catering | $320 | $271 | $49 | 15.3% |
| 049 | Law Firm Acct | $480 | $298 | $182 | 37.9% |
| 050 | Tradeshow | $190 | $195 | ($5) ← LOSS | -2.6% |
| TOTAL | $2,615 | $1,830 | $785 | 30.0% | |
Job #050 (Tradeshow) is unprofitable — but would have been invisible without job-level cost tracking.
ACTIONS FROM THIS REPORT:
- → Investigate why Job 050 lost money (underquoted? overrun on labor?)
- → Job 048 has thin 15.3% margin — review pricing or scope control
- → Jobs 047 and 049 at ~37% margin are the sweet spot — pursue more
- → Without job costing, the 30% average hides the 2.6% loss
Interactive Tool
Build your own job cost sheet — enter DM, DL hours and rate, apply overhead via POHR, and see total job cost and profitability instantly.
Job Cost Sheet Calculator
Pre-filled with ABC Coffee Shop Job #047 (hotel cold brew batch). Enter DM, DL hours/rate, and POHR to build a complete job cost sheet with applied overhead.
JOB COST SHEET
Job #: 2026-047
Customer: Downtown Hotel Chain
Description: Custom cold brew concentrate
Direct Materials
Direct Labor
Manufacturing Overhead Applied
Cost per liters: $1.89/liters
DM + DL + MOH
$378.09
$176.00 + $91.00 + $111.09
Cost / liters
$1.89
$378.09 ÷ 200
Gross Profit on Job
$221.92
37.0% margin
JOURNAL ENTRIES (on completion & sale)
DR Finished Goods Inventory $378.09
CR Work in Process $378.09
DR Cost of Goods Sold $378.09
CR Finished Goods Inventory $378.09
DR Accounts Receivable $600.00
CR Revenue $600.00
Common Mistakes
Mistake 1: Forgetting to Update the Job Cost Sheet in Real Time
❌ Wrong
Waiting until job completion to record all costs. If a job overruns on materials or labor, no one knows until after the customer has been quoted or invoiced — by then, the job may already be a loss.
✅ Right
Update the job cost sheet as costs are incurred. Run a "job-to-date" cost vs. estimate report regularly. Flag any job tracking 15%+ over budget before it becomes unrecoverable.
Mistake 2: Using the Same POHR for Very Different Jobs
❌ Wrong
Applying a single $17.09/DLH overhead rate to a simple 30-minute job AND a complex 10-hour job. The complex job may use significantly more machine time, supervision, and QC — a single rate may under-cost the complex job.
✅ Right
Consider multiple overhead rates (by department or activity) or Activity-Based Costing for operations where job complexity varies significantly.
Mistake 3: Treating Bids as Job Costs
❌ Wrong
Using the job cost sheet total as both the cost record AND the bidding basis without understanding whether POHR reflects true capacity utilization.
✅ Right
Bids are forward-looking estimates using expected costs. Job cost sheets are backward-looking records of actual costs. Compare them post-job to refine future estimates — never confuse the two.
Key Takeaway
Job order costing assigns manufacturing costs (DM, DL, and applied MOH) to individual jobs using a job cost sheet as the subsidiary ledger record. Costs flow: Raw Materials → WIP (job cost sheet) → Finished Goods → COGS. Overhead is applied using a POHR and reconciled to actual overhead at year-end; the difference (over/underapplied) is closed to COGS. The power of job order costing is job-level profitability visibility — every job's margin is known, unprofitable jobs are exposed, and pricing decisions can be refined based on actual cost data.
Test Your Understanding
Job cost sheets, overhead application, WIP reconciliation, and profitability — check your answers below.
Question 1: A job uses $450 DM, $280 DL (20 hrs at $14/hr), and POHR = $18/DLH. What is the total job cost?
Question 2: Actual overhead = $85,000. Applied overhead = $78,000. What is the result?
Question 3: True or False: In job order costing, all open jobs' individual cost sheets must total to the Work in Process general ledger balance.
Ready to Practice?
Build job cost sheets, apply overhead with POHR, and analyze job-level profitability in the Practice Lab.
Try the Practice LabWhat's Next?
Process Costing — When products are identical and produced in continuous flows, a different system is needed. Process costing averages costs across all units produced in a period.
Process Costing
Average costs across identical units
Manufacturing Costs
DM, DL, and overhead foundations