How Much Should You Buy Now, and How Much Should You Leave for Later?
Forward buying can protect you from rising commodity prices, but it comes with a bill. Inventory carrying costs, tied-up working capital and exposure if prices fall all land on the business.
- Forward buying can protect you from rising commodity prices, but it comes with a bill. Inventory carrying costs, tied-up working capital and exposure if prices fall all land on the business.
- Purchase timing depends on more than the price forecast. Demand plans, current stock, supplier lead times and financing costs all shape the right buying decision.
- Commodity price forecasting shows direction, and inventory data shows how much to commit. Price trends, supply-demand conditions and market disruptions help teams judge risk before they place an order.
- Buying too early and waiting too long both cost money. Excess stock drains cash, while a late purchase can raise costs or interrupt production.
- AI-powered forecasting speeds up the market view. It can process supply-demand, trade, logistics and geopolitical signals faster than manual research and refresh outlooks as conditions change, so teams can compare scenarios before committing. Forecasts remain assumption-based, not guarantees.
A Lower Price Today Can Become a Costly Decision Tomorrow
A procurement manager needs to decide whether to buy more raw materials as prices rise and suppliers warn of delays. At the same time, the CFO is concerned about how much cash the company can afford to tie up in inventory. The challenge is finding the right balance between securing materials at the right price and keeping inventory costs under control. The temptation is to buy more today. If prices keep rising, the business avoids higher purchasing costs and protects its margins. But if prices fall next month, the company is stuck with expensive stock, paying to store it long after the market has moved on. Waiting has its own risks. Prices could rise further, supply could tighten, and the material might not arrive when production needs it. That is the real problem behind forward buying in supply chain management. Early buying pays off only when the saving is bigger than the cost and risk of holding the extra stock. Answering it takes commodity price forecasting, procurement demand forecasting, inventory cost optimization and an honest look at the company’s finances.
The Hidden Cost of Forward Buying: What Extra Inventory Really Costs
Forward buying means purchasing more than you need right now to lock in a good price or protect against supply constraints. It can be a sound commodity procurement strategy, especially when lead times are long or price rises are likely. But the purchase price is only one part of the bill. Every extra unit brings storage, insurance, handling and financing costs, plus the risk of damage or obsolescence, and it ties up cash that could pay suppliers or keep production running. The effects can spread beyond one warehouse. Research in Management Science by Lee, Padmanabhan and Whang linked price swings and forward buying to the bullwhip effect, where small changes in orders grow larger as they move up the supply chain. And under IAS 2, stock bought at a high price may have to be written down if the market turns. A lower purchase price does not always mean a lower total cost of ownership. Count what the business pays to buy, finance, store and eventually use the stock.
Buy, Hold or Wait: How to Decide Purchase Timing
A good commodity purchasing strategy ties the market outlook to real inventory and demand. Back with our procurement manager, there are three honest options.
Buy when waiting costs more
If stock is thin and production is confirmed, securing part of the requirement early can reduce exposure. The case is stronger when the likely price benefit beats the carrying and financing cost. Fits when: forecasts point to upward pressure, supply risk is growing, lead times are stretching and demand is fairly certain. Main risk: excess stock and carrying cost if prices fall. Revisit when: the price or demand outlook changes.
Hold when your position gives you room
Know how many days current inventory supports and what would change the plan. Safety stock and supplier lead times matter here, because cutting stock too far can cause a stockout even when prices look attractive. Fits when: current stock covers near-term demand, the outlook is unclear and extra buying would squeeze working capital. Main risk: a stockout if cover is cut too far. Revisit when: stock cover drops below the agreed number of days.
Wait when buying early carries more risk than reward
Waiting protects working capital, but it needs limits. If availability worsens or prices pass a defined threshold, the cost of delay can overtake the benefit. Fits when: inventory is sufficient, demand is uncertain or market signals suggest prices could ease. Main risk: higher prices or tighter supply while you wait. Revisit when: prices pass the agreed threshold or lead times extend.
To the procurement manager, extra stock is protection. To the CFO, it is cash sitting on a shelf. Both are right, which is why the decision needs both of them. A January 2026 RELEX survey of 514 retail, manufacturing, wholesale and supply chain leaders found that 28% were increasing inventory or building strategic stockpiles, while 27% were returning to leaner models to control costs. The near-even split shows how differently businesses balance resilience against cost. H&Z’s 2026 Net Working Capital Study, which analysed nearly 300 manufacturing companies in the DACH region, found that median net working capital increased from 76 to 81 days between 2019 and 2024. Days inventory outstanding rose by nine days, and inventory was the main driver of the increase. Any saving from forward buying has to be weighed against financing costs, carrying costs and the risk that demand or prices change.
Connect Demand Forecasting With Inventory Decisions Before You Place the Order
A commodity price forecast becomes more useful when it is matched to the quantity the business will actually consume. Consider two manufacturers facing the same expected price rise. One has enough stock for the next production cycle. The other has a few weeks of cover. Same market information, very different purchasing decisions. That is why raw material inventory management and procurement demand forecasting belong alongside commodity market intelligence. Before committing to extra stock, check five things: expected demand, current inventory including open orders, supplier lead times, inventory carrying cost and financial flexibility. These checks separate a genuine sourcing opportunity from an unnecessary build-up, and they put procurement, operations and finance on the same page. Then compare the total expected cost of buying now with the cost of waiting, including likely price changes, supply continuity risk and the consequence of a stockout. There is no single carrying cost percentage that fits every business, so use your own cost data instead of an industry-wide benchmark.
Make Purchase Timing a Planned Decision, Not a Reaction
Many buying decisions turn urgent because a price rises or a supplier sends a warning. By then, the options have usually narrowed. A structured commodity procurement strategy sets out in advance how decisions will be reviewed: price thresholds that trigger a reassessment, materials that need closer monitoring and the right cover for critical items. Not every purchase needs a complex model. For commodities with big price swings or large budget impact, detailed commodity price forecasting and scenario planning are worth the effort. Ordering from expected demand, instead of reacting to every price rise, also avoids feeding the bullwhip effect. Before the next order goes out, run three checks this week: Cover: how many days of demand does current stock plus open orders cover for each critical material? Trigger: what price level or lead time would make you buy, hold or wait, and who signs off? Owner: who reviews the decision when the market moves, in procurement and in finance?
CommodityXO: AI-Powered Commodity Price Forecasting for Better Purchase Timing
Commodity prices rarely move on their own. Supply-demand shifts, geopolitical developments, trade policy and logistics constraints all shape the outlook, and tracking them by hand makes it hard to see which signals matter for a specific purchase. CommodityXO, STATXO’s AI-powered commodity price forecasting and intelligence platform, helps procurement teams assess price outlooks, interpret market signals and evaluate sourcing scenarios. For our procurement manager, that could mean checking whether the market points to upward pressure before securing part of the requirement early, or whether delaying a purchase is practical when prices may ease. It also gives procurement and finance one shared market view, which supports better decision intelligence on how much to buy and when. CommodityXO supports the market analysis behind these decisions. Teams still need to weigh internal demand forecasts, stock on hand, open orders, lead times and carrying costs, and it does not remove market uncertainty or guarantee a price outcome. Explore CommodityXO to learn more about AI-powered commodity price forecasting and market intelligence.
Back at the Buyer’s Desk: Buy Now, or Leave Room for Later?
Picture the procurement manager and the CFO in that corridor one more time. They do not need a perfect forecast to agree. They need their stock cover, the price level that would change the plan and a view of what the market is signalling. With that in front of them, a sensible answer is often a mix: buy part now, hold part in reserve and leave part uncovered until the picture clears. That is good purchase timing: a planned decision both teams can explain, whichever way the market moves.
Frequently Asked Questions
What is forward buying in supply chain management?
Forward buying is the practice of purchasing goods or raw materials ahead of immediate requirements, often to secure favourable prices, prepare for expected demand or reduce exposure to potential supply constraints. Its benefits depend on whether the expected savings outweigh inventory carrying costs and other risks.
What is the difference between forward buying and speculative buying?
Forward buying generally involves purchasing ahead to meet anticipated business requirements or manage future costs. Speculative buying involves taking a position primarily to benefit from expected price movements. The distinction depends on the purpose and quantity of the purchase, as well as the business’s actual demand and inventory needs.
How does commodity price forecasting improve purchasing decisions?
Commodity price forecasting helps procurement teams assess potential price movements and understand relevant market signals. When combined with demand forecasts, inventory levels and supplier lead times, it can support decisions about purchase timing, order quantities and sourcing alternatives.
What is inventory carrying cost?
Inventory carrying cost is the expense associated with holding stock over time. It can include financing, storage, insurance, handling and losses arising from damage, deterioration or obsolescence. Businesses should calculate these costs using their own financial and operational data rather than assuming one percentage applies to every industry.
How can businesses reduce raw material inventory costs without increasing stockout risk?
Businesses can improve raw material inventory management by aligning procurement demand forecasting with production requirements, monitoring inventory coverage, reviewing supplier lead times and setting appropriate safety stock levels. Commodity price forecasts can then help teams evaluate purchasing opportunities without allowing market expectations alone to drive excessive stock accumulation.