How to Calculate Fifo and Lifo Accounting

FIFO (First-In, First-Out) and LIFO (Last-In, First-Out) are two common inventory valuation methods used in accounting to determine the cost of goods sold (COGS) and inventory value. Understanding how to calculate these methods is essential for accurate financial reporting and tax purposes.

What Are FIFO and LIFO?

FIFO and LIFO are inventory accounting methods that determine the cost of goods sold and the value of inventory based on the order in which items are received and sold.

FIFO (First-In, First-Out)

FIFO assumes that the first items purchased or produced are the first ones sold. This method is commonly used in industries where products have a short shelf life or where inventory turnover is high.

LIFO (Last-In, First-Out)

LIFO assumes that the most recently purchased or produced items are the first ones sold. This method is often used in industries where inventory can be stored for long periods, such as manufacturing or real estate.

Both FIFO and LIFO are permitted under generally accepted accounting principles (GAAP) and are used by businesses to match costs with revenues and determine the value of inventory.

How to Calculate FIFO

Calculating FIFO involves tracking the cost of inventory in the order it was received. Here's a step-by-step guide:

Record the cost and quantity of each inventory purchase.
When goods are sold, deduct the cost of the oldest inventory first.
Calculate the cost of goods sold (COGS) by multiplying the quantity sold by the cost of the oldest inventory.
Update the inventory value by subtracting the cost of goods sold from the total inventory cost.

FIFO Formula:

Cost of Goods Sold (COGS) = Quantity Sold × Cost of Oldest Inventory

Inventory Value = Total Inventory Cost - COGS

Example Calculation

Suppose you have the following inventory purchases:

January 1: 100 units at $10 each
January 15: 50 units at $12 each

If you sell 75 units on February 1, the FIFO calculation would be:

First, sell 100 units from the January 1 purchase: 100 × $10 = $1,000
Then, sell the remaining 25 units from the January 15 purchase: 25 × $12 = $300
Total COGS = $1,000 + $300 = $1,300
Remaining inventory = 50 units at $12 each

How to Calculate LIFO

Calculating LIFO involves tracking the cost of inventory in reverse order. Here's a step-by-step guide:

Record the cost and quantity of each inventory purchase.
When goods are sold, deduct the cost of the most recent inventory first.
Calculate the cost of goods sold (COGS) by multiplying the quantity sold by the cost of the most recent inventory.
Update the inventory value by subtracting the cost of goods sold from the total inventory cost.

LIFO Formula:

Cost of Goods Sold (COGS) = Quantity Sold × Cost of Most Recent Inventory

Inventory Value = Total Inventory Cost - COGS

Example Calculation

Using the same inventory purchases:

January 1: 100 units at $10 each
January 15: 50 units at $12 each

If you sell 75 units on February 1, the LIFO calculation would be:

First, sell 50 units from the January 15 purchase: 50 × $12 = $600
Then, sell the remaining 25 units from the January 1 purchase: 25 × $10 = $250
Total COGS = $600 + $250 = $850
Remaining inventory = 100 units at $10 each

Comparison Table

Aspect	FIFO	LIFO
Definition	First items purchased are first sold	Most recent items purchased are first sold
COGS Calculation	Based on oldest inventory	Based on most recent inventory
Inventory Value	Lower than LIFO	Higher than FIFO
Tax Implications	Lower taxable income	Higher taxable income
Common Industries	Retail, food, perishable goods	Manufacturing, real estate

FAQ

Which method is more accurate for inventory valuation?

There is no single "more accurate" method. FIFO is often used when inventory turnover is high, while LIFO is used when inventory can be stored for long periods. The choice depends on industry standards and tax considerations.

Can I switch between FIFO and LIFO?

Yes, but switching methods can have significant tax implications. Consult with an accountant before making any changes.

How do FIFO and LIFO affect financial statements?

FIFO typically results in lower reported income and higher reported expenses, while LIFO can result in higher reported income and lower reported expenses. Both methods affect net income, COGS, and inventory values.