FIFO: The First In First Out Inventory Method


Brendan Tuytel


Reviewed by


October 27, 2020

This article is Tax Professional approved


What is First In, First Out (FIFO)?

First In, First Out is a method of inventory valuation where you assume you sold the oldest inventory you own first. It’s so widely used because of how much it reflects the way things work in real life, like your local coffee shop selling its oldest beans first to always keep the stock fresh.

What's Bench?
Online bookkeeping and tax filing powered by real humans.
Learn more
Friends don’t let friends do their own bookkeeping. Share this article.
Tired of doing your own books?
Try Bench

Under FIFO, your Cost of Goods Sold (COGS) will be calculated using the unit cost of the oldest inventory first. The value of your ending inventory will then be based on the most recent inventory you purchased.

How FIFO works (an example)

Bertie’s Breakfast Bars bought 3 batches of their signature bars ahead of a trade show:

  • She bought batch 1 first for 100 bars at $2.00 a bar
  • She bought batch 2 second for 300 bars at $1.00 a bar
  • She bought batch 3 last for 200 bars at $1.75 a bar

While at the trade show, Bertie does gangbusters and sells 300 breakfast bars. Before kicking back and relaxing, she wants to figure out what her net income was for the trade show. To do this, Bertie uses the FIFO method to figure out her Cost of Goods Sold.

The oldest bars in her inventory were from batch 1 so she will count 100 at the unit cost of batch 1, $2.00. For the remaining 200 she sold uses the unit cost of batch 2, $1.00. To calculate her COGS for the trade show, Bertie will count 100 bars at $2.00 and 200 at $1.50.

Bertie’s Cost of Goods Sold = (100 bars x $2.00) + (200 bars x $1.00)

Bertie’s Cost of Goods Sold = $400

FIFO method and inventory valuation

Bertie also wants to know the value of her remaining inventory—she wants her balance sheet to be accurate. To do this, she counts up the value of her remaining inventory.

• She has 100 bars left from batch 2 at $1.00 a bar

• She has the full 200 bars left of batch 3 at $1.75 a bar

Bertie’s ending inventory = (100 bars x 1.00) + (200 bars x 1.75)

Bertie’s ending inventory = $450

Bertie had 300 bars left over—the same amount she sold. But when using the first in, first out method, Bertie’s ending inventory value is higher than her Cost of Goods Sold from the trade show. This is because her newest inventory cost more than her oldest inventory.

Why is choosing a method of inventory valuation important?

Your inventory valuation method will affect two key financial statements: the income statement and balance sheet.

If your inventory costs are increasing over time, using the FIFO method and assuming you’re selling the oldest inventory first will mean counting the cheapest inventory first. This will reduce your Cost of Goods Sold, increasing your net income. You will also have a higher ending inventory value on your balance sheet, increasing your assets. This can benefit early businesses looking to get loans and funding from investors.

But if your inventory costs are decreasing over time, using the FIFO method will increase your Cost of Goods Sold, reducing your net income. This can benefit businesses looking to decrease their taxable income at year end.

If your inventory costs don’t really change, choosing a method of inventory valuation won’t seem important. After all, if the first piece of inventory you bought was the same value as the last piece of inventory, there will be no difference in the calculation of your Cost of Goods Sold or ending inventory.

But regardless of whether your inventory costs are changing or not, the IRS requires you to choose a method of accounting for inventory that’s consistent year over year. You must use the same method for reporting your inventory across all of your financial statements and your tax return. If you want to change your inventory accounting practices, you must fill out and submit IRS Form 3115.

Choosing—and sticking to—an inventory valuation method to measure these amounts is essential in keeping tax-ready books. If you want tax ready books to be a worry of the past, try Bench. We reconcile, review, and repeat until your finances are CPA ready so you don’t have to.

Further reading: Inventory Management for Small Business: A Simple Guide

Alternatives to the FIFO method

There are three other valuation methods that small businesses typically use.

Last In, First Out (LIFO)

The opposite to FIFO, is LIFO which is when you assume you sell the most recent inventory first. This is favored by businesses with increasing inventory costs as a way of keeping their Cost of Goods Sold high and their taxable income low.

Average cost inventory

The average cost method is the simplest as it assigns the same cost to each item. The average cost is found by dividing the total cost of inventory by the total count of inventory.

Specific inventory tracing

If you’re a business that has a low volume of sales looking for the most amount of detail, specific inventory tracing has the insight you’ll need. But it requires tracking every cost that goes into each individual piece of inventory.

How to track inventory

Whether you need an eagle eye into the hundreds of items you sell or if you just want to stay on top of your stock, there’s an inventory management solution that’s right for you. If you sell online, most POS systems like Shopify will track inventory for you. If you’re wanting to try it for yourself, there are free templates available online. If you’re ready to try out a dedicated inventory system, Zoho Inventory is free to start.

Additional resources

For more bookkeeping basics:

For more software solutions:

This post is to be used for informational purposes only and does not constitute legal, business, or tax advice. Each person should consult his or her own attorney, business advisor, or tax advisor with respect to matters referenced in this post. Bench assumes no liability for actions taken in reliance upon the information contained herein.
Friends don’t let friends do their own bookkeeping. Share this article.

Join over 140,000 fellow entrepreneurs who receive expert advice for their small business finances

Get a regular dose of educational guides and resources curated from the experts at Bench to help you confidently make the right decisions to grow your business. No spam. Unsubscribe at any time.