Your shelves are full. Where did the cash go?

Stock can make a business feel prepared. You have the sizes customers ask for, ingredients for a busy weekend, or spare parts that keep work moving. Yet a full stockroom can sit beside a bank account that is steadily shrinking.

Inventory is money committed to goods before those goods have produced a customer payment. Some stock protects service. Some is waiting longer than expected. Some may never sell at the planned price. Looking at one total hides those differences.

What this means for your business

The useful question is not whether inventory is good or bad. It is how much of each item you need, how long it will take to use or sell, and what happens if your expectation is wrong.

A retail shop, repair business and restaurant have different reasons to hold stock. A critical spare part may be worth keeping despite infrequent use. A perishable ingredient cannot wait indefinitely for demand. Judge the purchase against the job it does and the cash it occupies.

Distinguish stock value from money available

Your accounts may show inventory as an asset. That does not mean the same amount is available to pay rent. Converting stock into cash may require finding a buyer, delivering the product, accepting a markdown and waiting for payment.

The SEC's financial-statement guide explains the difference between assets on a balance sheet and cash movements. For an owner, the practical implication is to connect inventory records with the dates and amounts in the cash forecast.

Start with a reliable count. Separate available stock from damaged, expired, reserved or otherwise unusable units. A system showing twelve units cannot support a promise to a customer if four are damaged and six are already committed.

A bulk discount can use more cash than it saves

Imagine a shop using 40 units a month. It can buy 40 units at $10 each, spending $400 now. A supplier offers 200 units at $9 each, requiring $1,800 now. The larger order saves $200 across 200 units compared with buying all of them at $10, if every unit would otherwise be needed at that price.

It also uses $1,400 more cash today than the 40-unit purchase. At the expected usage, 200 units represent five months of supply. If usage falls to 25 units a month, that becomes eight months.

The discount might still be worthwhile. But include storage, damage, obsolescence, financing and the possibility that the product changes before you use it. A unit-cost saving is conditional on what happens to the units.

Read the stock by age and purpose

Look at recent sales or usage, the last receipt date, quantities on order and the reason for holding each important item. Group the stock into things you use regularly, things needed for a specific upcoming commitment, and things whose purpose is no longer clear.

Then ask why slow stock exists. Demand may have changed. A minimum order may be too large. Staff may have substituted another product. Duplicate purchasing may have occurred because no one could see what was already on order.

The response should match the cause. Simply telling the buyer to purchase less can cause shortages if the underlying problem is an inaccurate count or an unreliable supplier. Selling slow stock cheaply may recover cash, but check what it costs to sell and whether the offer displaces sales that would have happened anyway.

Decide when to reorder

A basic starting point is expected usage while waiting for the next delivery, plus a buffer for uncertainty. For example, using ten units a day with a reliable three-day lead time suggests 30 units of expected demand during that wait. A separate buffer depends on variation in demand, delivery reliability and the consequence of running out.

Lead time is the wait between placing an order and having usable stock available. If the goods need inspection or preparation after arrival, include that time. Also distinguish stock on the shelf from stock already ordered. With 25 usable units on hand, 20 confirmed to arrive in time and ten reserved for customers, there are 35 units available for other needs across that period. That does not mean 35 are available today: a late delivery could still leave an immediate shortage. Count reserved demand either here or in the demand forecast, not both.

Do not present the buffer as a universal percentage. Compare actual delivery times and usage, and consider open orders and customer commitments before placing another purchase. For perishable goods, shelf life and storage capacity also limit what a buffer can usefully achieve.

In a restaurant, an event booking may change demand more than last week's average. In a repair shop, one rarely used part may prevent a costly delay. The numbers need the commercial context.

Check whether the change improves the business

Try a revised order quantity or frequency on a manageable group of items. Track cash committed, shortages, emergency purchases, waste and service consequences together. Lower stock is not a success if emergency delivery charges and lost orders outweigh the saving.

For your next review, choose the items tying up the most cash and the items most likely to stop service. Count them, check what is already on order, compare realistic usage and decide the next purchase date. Record what changed so the next buyer does not have to reconstruct the reasoning.

Sources and further reading

The SEC's financial-statement guide provides the asset and cash-flow context; consulted September 20, 2026. Purchasing examples and reorder calculations are Black Lentil teaching material. Accounting valuation and tax treatment need separate advice. Continue with why cash can be tight despite sales and the 13-week cash workbook.