Buy stock before a supplier price rise: how many weeks is worth holding?

Your supplier has told you prices lift from 1 February. The obvious move is to fill the storeroom now. Sometimes that’s smart. Often it trades a few hundred dollars of saving for thousands of dollars of cash tied up on a shelf. The way to tell the difference is a break-even in weeks, and it takes about five minutes.

How many weeks of stock should I buy before a price rise?

Buy cover only up to your break-even point: the price rise as a percentage, divided by what it costs you each week to hold stock, also as a percentage of its value. A 6% rise and holding costs of half a percent per week give 12 weeks. Anything you’d still hold after 12 weeks costs more than it saves.

“Holding cost” is everything the extra stock costs you while it sits:

• Storage: extra shelving, a container, a rented unit, or the floor space you’d otherwise use.
• Shrinkage: damage, theft, expiry, and lines that go out of fashion.
• Insurance and handling: more stock to count, move and cover.
• Funding: the total dollar cost of whatever pays for it, whether that’s a facility or cash that would otherwise have been working elsewhere.

Add those up in dollars for a typical month, divide by the value of stock you’d hold, and you have a weekly figure. If you can’t estimate it closely, use a pessimistic number. Owners nearly always under-count shrinkage.

Why is the biggest pre-buy usually not the best one?

Because each extra month of cover saves the same dollars but costs more to hold. The saving per month of stock is fixed: the rise times the month’s purchases. The cost isn’t, because stock bought for April sits on the shelf for three months longer than stock bought for February, and the older it gets, the more of it is damaged, marked down or tied up in cash you could have used.

Here is the effect with invented numbers.

Illustrative example: a gift shop and a 6% rise

Illustrative only: invented figures, no real business.

A gift and homewares shop buys about $12,000 of stock a month from one main supplier. A notice arrives in December: prices rise 6% from 1 February. The owner can buy in January at the old price. Each month of extra cover is worth 6% of $12,000, or $720, in avoided price rise.

Months of extra cover bought in January	Stock bought	Saving	Holding cost (storage, shrinkage, funding)	Net
1 (February’s needs)	$12,000	$720	$400	$320
2 (to March)	$24,000	$1,440	$1,100	$340
3 (to April)	$36,000	$2,160	$1,950	$210
4 (to May)	$48,000	$2,880	$3,000	-$120

The net peaks at two months of cover, and only just beats one month. The third month adds $720 of saving and $850 of cost. The fourth loses money outright. The owner who bought four months because “the price was going up anyway” paid $120 for the privilege and tied up $48,000 of cash during the quietest trading weeks of the year.

Now add a seasonal catch. If some of those lines are summer-themed and the next big sales window is Christmas, the shrinkage figure for the later months should be worse, and the best answer shifts toward one month. The method doesn’t change. The numbers do.

If you want to test your own figures, our cost of waiting calculator lets you put the saving next to the holding cost and the total dollar cost of any finance.

Is the rise a real list price change or a surcharge?

Check the wording of the notice before you commit cash. A list price change is usually permanent. A freight, fuel or “cost recovery” surcharge can move again, up or down, so buying ahead locks in a saving against something that might ease.

The latest ABS figures show why surcharges are a live issue. The consumer price index rose 4.3% in the year to September 2026, and the ABS reported transport up 8.7% over the year, with automotive fuel up 9.4% in September alone. Those are household prices, not your supplier’s price list, but they show that fuel-driven freight costs are moving. If your supplier’s notice cites freight or fuel, ask whether the surcharge is reviewed regularly and when. The answer changes how far ahead you should buy.

Can I lock the old price without paying for everything now?

Often, yes, and it’s the cheapest move on the table. Instead of buying months of stock up front, ask for a blanket or standing order: today’s price held on an agreed quantity, with deliveries released monthly. Suppliers who want to keep your account will often agree, particularly if you commit to a volume you were going to buy anyway.

Expect one of three answers:

1. Yes, price held, staged deliveries. You get the saving with almost no holding cost. Take it.
2. Yes, but with a deposit or a minimum. Compare the cash tied up with the saving, the same way as above.
3. No. You’re back to the table.

Get any agreement in writing, with the price, the quantity, the delivery dates and what happens if you take less. If your supplier’s quote is expiring while you sort funding, our guide on what to do when a quote expires before finance is approved covers the same trade-offs.

Does buying stock early save tax?

Not reliably, and a large pre-buy can make your tax admin heavier. Stock you still hold at the end of the income year is generally counted rather than deducted, because trading stock rules are about what you’ve sold, not what you’ve bought.

The ATO’s simplified trading stock rules let eligible small businesses skip the year-end stocktake and the stock valuation, but only while the value of your stock has changed by $5,000 or less over the year. A pre-buy of $24,000 or $36,000 that’s still on the shelf at 30 June will usually take you past that, and the general rules apply. So the pre-buy doesn’t create a deduction, it creates a stocktake. The rules have conditions and exceptions, so check how they apply to you on the ATO’s trading stock page and with your accountant.

GST is a smaller point, but it affects cash. GST credits come back to you through your BAS, not at the till, so a large purchase means you carry the GST until the credit is claimed. For a $36,000 buy, that’s an extra $3,600 of cash out the door in the meantime. If you want the wider picture on the June question, see our guide on EOFY stock purchases.

What about buying ahead with borrowed money?

A short facility can make sense if the stock will sell quickly, the saving clearly exceeds the total dollar cost of funding it, and the repayments line up with the sales. It makes much less sense when the stock is slow, or when the borrowing would be repaid from the same cash you need for wages and BAS.

Do the sum with the total dollar cost over the period you’d really hold the stock, not the headline amount. In the gift shop example, the funding cost is already inside the “holding cost” column. If that holding cost were twice as high, even the one-month pre-buy would lose money. Check the sum before you borrow, not after.

When is buying as you need it the smarter call?

Plenty of times. This site would rather say so than push a purchase. Wait and buy as needed when:

• The line is seasonal or fashion-driven. Summer stock bought in January for April carries markdown risk.
• It’s perishable or dated. Food, chemicals, cosmetics and anything with a use-by date.
• It sells slowly. If you have 12 weeks of cover already, the new rise starts to bite on stock you haven’t sold yet.
• A new model or range is due. You’d be pre-buying the thing about to be replaced.
• You’re short of cash. If the pre-buy would crowd out wages, super or tax payments, the cost of that squeeze beats the saving.
• The supplier price isn’t the problem. If your margin is thin, a review of your own pricing may do more than a stock-up. Our guide on when waiting is smarter covers that call.

Waiting also keeps your options open. Prices can move the other way, a supplier can match a competitor, and a notice sometimes gets softened after customers push back.

How do I decide in five minutes?

Work these five numbers out, in this order:

1. The price rise, as a percentage and in dollars on your normal monthly purchase.
2. Your weekly holding cost, including storage, shrinkage and the dollar cost of funding.
3. Your break-even in weeks (rise ÷ weekly holding cost).
4. How many weeks of cover you already hold. Subtract those from the break-even.
5. Whether the supplier will stage deliveries at the old price.

If the answer to the last one is yes, stop there and take it. If it’s no, buy the number of weeks that leaves you comfortably inside your break-even, usually one or two months, and keep the rest of your cash for the business. For more on how supplier price notices play out, see what to do when a supplier price increase notice lands and how bulk discounts work in bulk-buy discounts: are they worth borrowing for?.

Want a second opinion on whether the pre-buy pays?

If the numbers say buying ahead is worth it and you’d rather not drain your working cash, we can help you look at funding that matches the sell-through. The 60-second enquiry at apply takes no credit check, so asking won’t leave a mark on your credit file. We won’t send your details to a pile of lenders. A real person reads your answers, looks at your individual situation and calls you to talk through the options, including whether it’s better to hold off. Please fill in the form accurately, including the stock you plan to buy and when it should sell, so we can point you toward the right option first time.

Check your options →