Reorder Points and Safety Stock for a Türkiye Subsidiary

A purchasing clerk reorders a component when the shelf looks low. Three weeks later the same part is out of stock, the supplier's next shipment is six weeks out because it comes from overseas, and a production line sits idle waiting for a part that cost a few dollars. This is not a rare failure. It is the default outcome of reordering by eyeballing a shelf instead of by a calculated trigger point, and it is more expensive in Türkiye than in many markets because import lead times are longer and the Lira cost of holding excess safety stock moves with the exchange rate.

Why does "reorder when it looks low" fail predictably?

It fails because it ignores the two numbers that actually determine when to reorder: how fast the item is consumed, and how long it takes to get more. A fast-moving item with a short local lead time can run close to empty without risk. A slow-moving imported item with a ten-week lead time needs a much larger buffer, even though it sits on the shelf longer and ties up more capital while it waits. Eyeballing a shelf treats both cases the same, which is exactly backwards.

What is a reorder point, and how is it calculated?

The reorder point is the stock level at which a new purchase order should be triggered so the next shipment arrives before stock runs out. In its basic form:

Reorder point = (average daily usage × lead time in days) + safety stock

• Average daily usage comes from historical sales or consumption data, ideally a rolling average that adjusts as demand shifts, not a single month that might have been unusually slow or busy.
• Lead time is the real time from placing the order to the stock being usable, not just "in the country." For imported items this includes supplier production time, shipping, customs clearance, and internal receiving, each of which can add days that get missed if only the shipping leg is counted.
• Safety stock is the buffer that absorbs the variability in both usage and lead time. A supplier with a reliable six-week lead time needs less safety stock than one whose six weeks occasionally becomes nine.

Where does ERP add something a spreadsheet cannot?

A spreadsheet can hold this formula for a handful of items. It breaks down once a company carries several hundred SKUs, several suppliers with different lead times, and demand that shifts with seasonality, because someone has to remember to update it, and in practice nobody does after the first quarter.

In ERP, the calculation runs against live data instead of a snapshot:

• Average daily usage recalculates automatically as new sales transactions post, so a demand shift shows up in weeks, not at the next annual review.
• Lead time is tracked per supplier and per item, based on actual past purchase-order-to-receipt history rather than the number written on the supplier's price list.
• The reorder point is evaluated continuously against current stock, and a purchase requisition is generated automatically when the threshold is crossed, instead of depending on someone noticing.

How does currency volatility change the safety stock decision?

For a foreign-owned subsidiary, the reorder point calculation is not purely an operations question, since it has a working capital cost. Carrying six weeks of safety stock on an imported component means six weeks of Lira tied up in inventory, and the Lira value of that inventory shifts with the exchange rate the item was purchased at versus the rate at valuation date. Finance and operations end up wanting opposite things: operations wants more buffer to avoid a stockout, finance wants less capital sitting on a shelf. Neither side wins that argument with a gut estimate.

ERP resolves this by making the trade-off visible rather than settling it once and forgetting about it: the reorder point and safety stock level for each item are stored as data, not policy set once in a meeting three years ago. When a supplier's lead time changes, or when a component becomes critical enough that a stockout would halt a production line, the safety stock for that specific item can be adjusted without touching hundreds of other SKUs that do not carry the same risk.

Which items deserve a calculated reorder point first?

Setting this up for every SKU on day one is the same mistake as trying to configure every piece of equipment in a maintenance system at once: the project stalls under its own weight. A more workable sequence:

1. Items where a stockout stops production or a shipment: usually a small number of critical imported components or single-source materials. These get calculated reorder points first.
2. High-volume, high-turnover items: not critical individually, but frequent enough that manual reordering consumes real staff time every week.
3. Everything else: low-value, slow-moving, or easily substituted items can stay on simpler rules, or even periodic manual review, without meaningful risk.

How does this connect to the rest of the operation?

A reorder point that only exists in the inventory module is half the value. The purchase requisition it generates needs to flow into the same approval chain as any other purchase order, and the item's cost, including landed cost for imports, needs to post to the same cost accounting the rest of the business uses. In Birasyo, the inventory and purchasing modules share this data natively: a threshold crossing creates a requisition, the requisition follows the standard approval chain, and the resulting purchase order carries the same supplier lead-time history that produced the reorder point in the first place. The inventory module page has the setup details.

Key points

• Reordering by looking at a shelf ignores usage rate and lead time, the two inputs that actually determine when to reorder.
• Reorder point = (average daily usage × lead time) + safety stock; each input should come from actual historical data, not an estimate.
• ERP keeps this calculation current automatically as sales and receiving transactions post, which a spreadsheet cannot sustain past a few dozen SKUs.
• For a Türkiye subsidiary, safety stock is also a working-capital and FX exposure decision, not a purely operational one.
• Start with the small set of items where a stockout would stop production, then expand from there.

Sources: the reorder point formula and safety stock methodology referenced here follow standard inventory management practice (economic order quantity and safety stock theory as taught in operations management and used in common ERP inventory modules); no jurisdiction-specific regulatory figures are cited in this article. For company-specific lead time, demand variability, or working capital decisions, confirm figures against your own purchasing and finance records.

If you'd like to see how a calculated reorder point would work against your current item list, a demo is a good place to start.

Related reading:

• How Duplicate Vendor Records and Incomplete Item Masters Distort Group Reporting
• Supply Chain Resilience for Türkiye-Based Operations Across Currency, Logistics and Suppliers
• Landed Cost in Türkiye Imports: Calculating the True Unit Cost