Periodic inventory systems count stock at set times. Learn the formula, the steps, the pros and cons, and when a small warehouse should move on.
Book a callPeriodic inventory systems count stock at set times, such as monthly or yearly, not after every sale. The book balance stays flat between counts. Wholesalers, distributors and warehouses use a periodic inventory system most. Reviewed November 2026.
The law backs the count. IRS Publication 538 says, "To figure taxable income, you must value your inventory at the beginning and end of each tax year." Every business that holds stock owes that count. A periodic inventory system is the plainest way to pay it.
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Book a callA periodic inventory system runs in a cycle of 4 steps. Each step is simple, and the count is the one that matters.
Cost of goods sold, the price you paid for the stock you sold, is worked out after the count. Until then, the books show old numbers. Count day is the only day the books match the shelf.
The periodic inventory formula is beginning inventory plus buys minus ending inventory equals cost of goods sold. Here is a round example. You start the month with $10,000 of stock. You buy $6,000 more. The count at month end shows $8,000.
$10,000 + $6,000 - $8,000 = $8,000 cost of goods sold.
A bad count gives a bad cost of goods sold, so the count sets your profit number.
Periodic vs perpetual inventory comes down to when the numbers update. A perpetual system updates on every sale or receipt. A periodic system updates only at the count.
| Factor | Periodic | Perpetual |
|---|---|---|
| When stock updates | At each count | On every sale or receipt |
| How current the data is | Old between counts | Current all day |
| Daily effort | Low | Higher |
| Setup cost | Low | Higher |
Neither system is wrong. Pick periodic when volume is low, and pick perpetual when stale numbers cost you sales.
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Periodic inventory is cheap and simple, but its numbers go stale. Weigh both sides.
Pros:
Cons:
Small shops with low volume, low-value bulk goods, or no stock tracking yet fit the pros best. Busy warehouses feel the cons first.
A warehouse should move away from periodic counting when stale numbers cost it sales or trust. Four signs show it:
The FTC's mail, internet and telephone order rule holds sellers to the ship dates they state. An accurate count protects that promise. Two signs from the list mean it is time to act.
A physical inventory count is a hands-on tally of every item in the building. Plan the date first. Then name who counts what, and who signs off.
Good prep cuts count errors. Tidy the bins and label each location. Finish open receiving and shipping first. Pick a quiet window, such as a weekend. Print count sheets, or load them on a tablet, with one line per location. A clean room makes a clean count.
Careful counting needs a second pair of eyes. Use 2-person teams, or recount high-value items. Record each count by location. Mark every counted item with a tag or sticker so no one counts it twice. A marked shelf is a finished shelf.
Reconciling means you compare what you counted to what the books expect. Look into big gaps before you change anything. A gap can be a typo or a missed pallet. Once the cause is clear, post the adjustments in QuickBooks. Keep the signed count sheets with the entry. Never adjust a number you cannot explain.
Four mistakes cause most bad counts:
Save every sheet, because the records are your proof.
Off-the-shelf means fitting your process to the software. We do it the other way round, and the first look costs nothing.
Book a callCount at least once a year, and count more often when stock is fast or costly. Annual counts fit slow stock. Quarterly or monthly counts fit high-value goods. Each extra count costs labor. Take 3 people at 6 hours a week and $22 an hour. That is $20,592 a year. The Bureau of Labor Statistics lists pay for stock clerks if you want your own rate.
Cycle counting is a middle path. You count a small slice of stock each week. Start with fast movers and high-value items. The slices add up to the whole building, so you skip the full shutdown count.
Yes, you can run periodic inventory in QuickBooks. Many small distributors pair QuickBooks inventory with an Excel count sheet. The team counts, types the numbers in, and posts one adjustment at period end. The setup is cheap and familiar.
The cracks show fast. Copy and paste errors creep in. Several file versions float around. Printed sheets get lost or smudged. Different people write different units, and typos stay hidden until the next count. Manual steps are the weak point, not QuickBooks.
No, you do not need a big ERP (a large system that runs a whole company) to track stock in real time. A gradual path works for teams of 5 to 100 staff.
The Software Society builds custom tools around how your team already works. QuickBooks stays your accounting record. The custom layer handles counts, receiving and stock levels. Two examples fit a small shop. A count screen replaces printed sheets. A shared stock view replaces email threads. For vendor-neutral process guidance, see the NIST Manufacturing Extension Partnership. Wholesale firms also hold large stock; the Census Bureau tracks it each month.
Choose by checking five things: volume, SKU count, item value, cost of an error, and staff time. Low volume, few SKUs and cheap goods favor periodic. High volume, many SKUs and costly mistakes favor live tracking. If staff lose hours to counts, a live view pays back that time.
Not sure where your shop falls? Talk to The Software Society about a business review. We can map your manual steps and show which ones to replace first.
A periodic inventory system counts stock at set times, such as month end or year end. Buys go to a buys account. Cost of goods sold is worked out after the count.
A perpetual system updates stock on every sale or receipt. A periodic system updates only when you count. Perpetual data is current all day. Periodic data is old between counts.
Beginning inventory plus buys minus ending inventory equals cost of goods sold. With $10,000 start, $6,000 bought and $8,000 counted, cost of goods sold is $8,000.
Yes. Many small distributors count stock in Excel and post one adjustment in QuickBooks at period end. Manual entry is where errors creep in.
Count at least once a year. Fast or high-value stock needs quarterly or monthly counts. More counts cost more labor.
Cycle counting means you count a small slice of stock each week. Start with fast movers and high-value items. It reduces the need for a full shutdown count.
No. You can list your pain points, track only what matters live, and keep QuickBooks as the accounting record. A custom tool can replace just the manual parts.
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