What is a period cost?
A period cost is any cost that is expensed in the accounting period it is incurred — rather than being attached to inventory and recognised later when goods are sold. Period costs appear on the income statement immediately and reduce net income in the current period.
The defining characteristic is that period costs are not part of the manufacturing or production process. They are incurred regardless of how much the company produces or sells. Rent on a head office, the CEO's salary, and a national advertising campaign are all period costs — they happen in a period and are recognised in that period, full stop.
Period cost formula
Total period cost
Both categories flow directly to the income statement in the period incurred. Neither passes through Work-in-Process, Finished Goods, or COGS.
Expanded breakdown
Quick example
What counts as a period cost
The practical test: is this cost related to making the product, or to running and selling the business? If it is the latter, it is almost certainly a period cost.
Notice what is not on this list: direct materials, direct labor, factory rent, factory utilities, and manufacturing overhead. Those are all product costs — they flow into inventory and become COGS only when the goods are sold.
How to calculate period cost step by step
- Pull all operating expenses for the period. Gather every expense line from the income statement or trial balance for the month, quarter, or year you are analysing.
- Remove COGS and manufacturing overhead. Any cost that was part of producing goods — direct materials, direct labour, factory overhead — is a product cost. Set it aside.
- Classify remaining expenses as selling or G&A. Selling expenses relate to the revenue-generation process. G&A expenses relate to running the business as a whole.
- Sum the selling expenses. Add all costs in that category for the period.
- Sum the G&A expenses. Add all costs in that category.
- Add the two totals. Selling + G&A = total period cost for the period.
Worked examples
Example 1 — Small retailer (monthly)
Sales staff wages: $8,000 · Advertising: $2,500 · Office rent: $3,200 · Admin salaries: $5,500 · Accounting software: $300
All $19,500 hits the income statement this month
Example 2 — Manufacturer (quarterly)
Advertising: $32,000 · Sales commissions: $41,000 · CEO salary: $55,000 · Legal fees: $8,500 · Office depreciation: $4,200
Factory rent and wages are excluded — those are product costs
Example 3 — SaaS company (annual)
Sales & marketing: $1,200,000 · G&A: $850,000
Typical for SaaS — high S&M spend relative to G&A
Example 4 — Mixed cost classification
Total operating expenses: $280,000 · Manufacturing overhead included: $95,000 · Direct labor included: $60,000
Subtract product costs from total to isolate period costs
Full income statement showing period cost placement
This shows exactly where period costs land on a manufacturer's income statement — below gross profit, separate from COGS.
| Line item | Amount | Cost type |
|---|---|---|
| Revenue | $800,000 | — |
| Cost of goods sold (product costs) | ($480,000) | Product cost |
| Gross profit | $320,000 | — |
| Selling expenses | ($85,000) | Period cost ✓ |
| General & administrative expenses | ($95,000) | Period cost ✓ |
| Operating income | $140,000 | — |
| Interest expense | ($12,000) | Period cost ✓ |
| Net income before tax | $128,000 | — |
| Total period costs | ($192,000) | $85k + $95k + $12k |
Period cost vs product cost
This is the most tested distinction in managerial and cost accounting. The two categories follow completely different paths through the financial statements.
| Attribute | Period cost | Product cost |
|---|---|---|
| What it includes | Selling, G&A, interest expense | Direct materials, direct labour, manufacturing overhead |
| Flow through financials | Directly to income statement | Balance sheet (inventory) → income statement (COGS) when sold |
| Appears on IS in | Same period incurred | Period goods are sold (can be later) |
| Affects inventory? | Never | Yes — sits in WIP or finished goods first |
| Income statement position | Below gross profit (operating expenses) | In COGS — reduces revenue to gross profit |
| Common examples | Advertising, CEO salary, office rent, legal fees | Factory wages, raw materials, factory depreciation |
The key implication: product costs can be deferred — they stay on the balance sheet as inventory until the goods are sold. Period costs cannot be deferred — they hit the income statement immediately, regardless of whether any goods were produced or sold that period.
Grey areas and common classification traps
Some costs sit on the boundary and require judgement or policy decisions to classify consistently.
- Research and development (R&D): Under US GAAP, R&D is almost always a period cost — expensed immediately. Under IFRS, development costs meeting specific criteria can be capitalised as an intangible asset. Know which standard your entity uses.
- Shipping and freight: Inbound freight on raw materials is a product cost (part of material cost). Outbound freight to customers is a selling expense — a period cost. The direction of the shipment determines the classification.
- Mixed-use occupancy: If a building houses both a factory and administrative offices, the occupancy cost must be split. The factory portion is manufacturing overhead (product cost); the office portion is G&A (period cost). Allocation methods must be applied consistently.
- Depreciation: Depreciation on factory equipment is manufacturing overhead (product cost). Depreciation on office furniture, company cars, and administrative computer systems is a period cost (G&A). The asset's use determines the classification — not the depreciation method.
- Interest expense: Generally a period cost under both GAAP and IFRS, expensed as incurred. However, interest on borrowings to finance qualifying asset construction can be capitalised during the construction period — a narrow exception with strict criteria.
Common mistakes to avoid
- Including manufacturing overhead as a period cost. Factory rent, factory utilities, and indirect factory labour are product costs — they flow through inventory. Only non-factory overhead is a period cost.
- Treating all depreciation as a period cost. Depreciation on manufacturing equipment belongs in product cost (manufacturing overhead). Only depreciation on non-production assets is a period cost.
- Misclassifying inbound freight as a selling expense. Freight paid to receive raw materials into the factory is part of material cost — a product cost. Freight paid to ship finished goods to customers is a selling expense — a period cost.
- Confusing period costs with variable costs. Period vs product is a financial reporting classification. Variable vs fixed is a cost behaviour classification. They are orthogonal — a period cost can be either fixed (CEO salary) or variable (sales commission).
- Assuming all below-gross-profit expenses are period costs. Interest expense, income tax expense, and some extraordinary items also appear below gross profit but may need separate treatment depending on context.
Frequently asked questions
What is a period cost in accounting?
A period cost is any cost that is expensed immediately to the income statement in the period it is incurred — rather than being attached to inventory and recognised later. Period costs include selling expenses and general and administrative (G&A) expenses.
What is the formula for total period cost?
Total Period Cost = Selling Expenses + General & Administrative Expenses. Both categories are expensed in the period incurred and appear on the income statement below gross profit.
What is the difference between period costs and product costs?
Product costs (direct materials, direct labour, manufacturing overhead) are attached to inventory and only recognised as expense (COGS) when goods are sold — they can be deferred on the balance sheet. Period costs are expensed immediately regardless of production or sales volume — they cannot be deferred.
Is depreciation a period cost?
It depends on the asset. Depreciation on manufacturing equipment is a manufacturing overhead — a product cost that flows through inventory. Depreciation on office furniture, administrative computers, and company vehicles is a G&A expense — a period cost. The asset's use determines the classification.
Is factory rent a period cost?
No. Factory rent is manufacturing overhead — a product cost that is allocated to units produced and flows through inventory to COGS. Only non-factory rent (head office, sales offices, warehouses for finished goods distribution) is a period cost.
Can a period cost be fixed or variable?
Yes. Period cost (product vs period) and cost behaviour (fixed vs variable) are separate classifications. A CEO salary is a fixed period cost. Sales commissions are a variable period cost. They are both period costs, but one moves with revenue and one does not.