Types of inventories that exist in Mexico and how to manage them for growth

Inventory is much more than a simple list of products stored in a warehouse. For any SMB in Mexico, it is working capital in motion, the true financial engine that, if mismanaged, can choke operations.

Poor management translates into very tangible problems: cash tied up in slow-moving stock, frustrated customers who can't find what they are looking for (the famous stockouts), and direct losses from expired or damaged products. Understanding the different types of inventory that exist is, without a doubt, the first step to turning this challenge into a real competitive advantage.

What is inventory and why does it define the success of your SMB

Think of it this way: inventory is like the bloodstream of your business. If the flow becomes slow, blocked, or inefficient, the entire system suffers. In practical terms, inventory encompasses all goods and materials a company owns, whether to sell them directly or to use them in its own production process.

Let's take a coffee shop in Colonia Roma in Mexico City as an example. Its inventory isn't just Chiapas coffee beans. It also includes milk from local producers, disposable cups, lids, sugar packets, and even napkins. Each of these items has an associated cost and a direct impact on day-to-day profitability.

The fundamental classification of inventories

To bring order to this complexity, inventories are usually grouped into two major categories that answer very specific questions: What stage of production is this product in? and What do I strategically need it for?

As the diagram shows, inventory is not a uniform mass. The key lies in segmenting it to control and optimize it with precision.

Understanding this division is the starting point for any robust control system. For example, a barbershop in Tijuana, Baja California, needs to manage both its styling waxes and gels for sale (classified by stage) and a safety stock of its most frequently used razor blades (classified by purpose) so it never has to halt a service.

Good inventory control seeks the perfect balance between supply and demand. Managing it correctly not only cuts operating costs but also elevates the customer experience by ensuring they always find what they are looking for.

To help you better visualize these categories, we have prepared a summary table.

Quick classification of inventory types

This is a panoramic view of the main inventory categories according to their stage in the production chain and their strategic purpose. It will help you quickly identify which ones apply to your business model.

This conceptual map gives you the basis to start organizing your assets. If you want to dive deeper into the methods for registering and valuing these goods, we recommend consulting our complete guide on product inventory.

Inventories according to their stage in the value chain

One of the most common mistakes I see in SMBs is treating all their inventory as if it were a single thing. Thinking of "the warehouse" as a uniform pile of products is a view that oversimplifies reality and, in the long run, is very expensive. The key to effective control is to start by classifying it according to its phase within the production process.

Think of it this way: flour in the sack is not the same as dough fermenting, or bread already baked and ready on the counter. Each stage has its own rules, risks, and opportunities. Understanding this difference gives you tremendous visibility to make much finer decisions, from when to buy inputs to how to adjust your production.

Raw materials inventory

This is where everything starts, especially if your business manufactures or assembles. Raw materials are the basic inputs you buy to create your products. They are the building blocks of your operation; they don't have their final shape yet, but without them, there is simply nothing to build.

Let's take the case of an artisanal ice cream parlor in Mérida, Yucatán. Its reputation is based on the freshness and quality of its ingredients. Its raw materials inventory would include:

• Local seasonal fruits like mango, dragon fruit (pitahaya), or mamey.

• Milk and cream from nearby dairy farms.

• Sacks of sugar and vanilla beans from Veracruz.

A miscalculation here and production halts. Or worse, it forces you to buy emergency inputs of lower quality, affecting that flavor your customers love. Good control alerts you just in time to reorder and keep the machinery moving.

Work in process inventory (WIP)

Once you take those raw materials and start transforming them, they become work in process inventory, or WIP. These items are no longer raw inputs, but they are not ready for sale either. They are halfway there.

Imagine a bakery chain with several branches in the State of Mexico. Its WIP inventory is the dough that is proofing for the next day's bolillos or the conchas that are already shaped but waiting for their turn to go into the oven. You can't sell a raw concha, but that work-in-process inventory is a valuable asset that represents invested capital and effort.

Having visibility over your WIP is essential for detecting bottlenecks. Is too much dough accumulating before baking? Maybe you need another oven or to adjust times.

Finished goods inventory

This is the inventory we all know, the one on the display shelf, ready for the customer to take home. These are the items that have already gone through the entire production process and their respective quality control. For any retail business, this is the heart of its inventory.

A pharmacy in Cholula, Puebla, lives and dies by its finished goods inventory. Having high-demand medicines in stock, like cold remedies during the rainy season, is the difference between a loyal customer and one who goes to the competition at the first opportunity. Running out of a popular pain reliever over the weekend is not an inconvenience, it is a guaranteed lost sale.

Managing finished product inventory is critical, especially for retail SMBs. In regions like Nuevo León, data from INEGI suggests that for 65% of these companies, this inventory can represent up to 70% of the total value of their stock. This highlights the enormous importance of these inventories and the need for efficient rotation.

It is no wonder that this inventory represents your largest capital investment. That's why mastering its counting and management, as we explain in our guide on how to do a product inventory, directly impacts your cash flow.

Supplies or MRO inventory

There is one final category, often forgotten but just as critical: supplies inventory. It is also known as MRO (Maintenance, Repair, and Operations). These items are not part of the product you sell, but without them, your business paralyzes.

Let's think about a trendy barbershop in the Zona Rosa of Mexico City. The service it sells is a haircut or a beard trim, but to provide it, it needs:

• Disposable razor blades.

• Shaving creams and after-shave lotions.

• Cleaning products to disinfect tools and stations.

None of these supplies are sold directly to the customer, but if you run out of clean blades, the barber cannot work. It's that simple. Managing these supplies well ensures the continuity and quality of the service that sets you apart.

Strategic inventories to protect your operations

We've already seen the types of inventory according to their physical form, but now we go to a deeper layer: their strategic function. Because a well-thought-out inventory is not just for selling today; it is your main defense against unexpected events and the key tool to seize opportunities that arise.

Thinking this way is moving from putting out fires to building a bulletproof business. Instead of just counting boxes, you start to ask: how much do I need so a delay doesn't leave me at zero? How do I prepare for the high season without having too much or too little merchandise? This mindset is what distinguishes a business that survives from one that truly thrives.

Safety stock: your business's cushion

Safety stock, or reserve inventory, is that extra amount of product you keep "just in case." It is not meant for daily sales. Its sole mission is to be a cushion that protects you from blows: a supplier being late, demand spiking overnight, or a problem on your own production line.

Imagine a successful restaurant in San Pedro Garza García, Nuevo León, famous for its beef cuts. On a weekend, it fills up unexpectedly or a roadblock stops the supplier's truck. Without safety stock—those extra cuts kept frozen—it would run out of its star product, disappointing loyal customers and losing sales.

The goal of safety stock is simple: reduce risks and ensure the business keeps running. It's not there to generate immediate profits, but to prevent losses when things don't go as planned.

This cushion is vital in Mexico, where it is estimated that supplier delays are a reality for nearly 35% of supply chains. For an SMB, especially if it has several branches, this inventory can represent between 15% and 20% of its total stock, with the carrying cost that implies. You can read more about how logistics impacts the handling of different types of inventory to better understand its importance.

Seasonal inventory: to capitalize on demand

Unlike safety stock, which protects us from the unexpected, seasonal inventory (or anticipation inventory) is planned for demand peaks that we can predict. The strategy here is to build up stock of specific products long before their busy season arrives.

The classic example is a gift shop in downtown Mexico City. It knows perfectly well that Mother's Day, Valentine's Day, or Christmas will trigger the sale of certain items. What does it do? It starts buying chocolates, mugs, and flowers months in advance. This ensures it won't run out and, very often, secures better prices from suppliers by buying early and in larger volumes.

This approach is essential for businesses with cyclical sales:

• Ice cream parlors in Progreso, Yucatán: Accumulate bases and popular flavors before the spring and summer heat arrives in full force.

• Stationery stores in the State of Mexico: Stock up on notebooks and school supplies months before the back-to-school season.

• Barbershops on the Baja California coast: Increase their stock of sun protection products for beards during high tourism months.

The big challenge here is precision. If you buy too much, you are left with merchandise that will be a headache to sell out of season. If you buy too little, you leave money on the table. This is where analyzing your sales data from previous years becomes your best ally.

Obsolete inventory: the silent enemy

Finally, we come to what keeps any business owner awake at night: obsolete inventory. Also known as dead stock, these are all those products that simply no longer sell. Whether because they went out of style, their expiration date is near, or simply, the public didn't like them as you expected.

This type of inventory is a double problem: not only does it occupy valuable space in your warehouse, but it is also stagnant capital that generates absolutely nothing for you. It's like having bills stored in a box that lose value every day that passes. A pharmacy that didn't sell enough sunscreen at the end of summer in Cancún faces this problem as soon as autumn arrives.

The best defense is prevention. Analyzing your product turnover helps you detect those slow-moving items before they become an unsolvable problem. Good inventory software can alert you to this automatically. But if you already have obsolete stock, the key is to act fast. Run promotions, create bundles, or even donate it; the goal is to recover at least part of the investment and, above all, free up that space for products that do turn over.

How to choose the right inventory control method

Once you are clear on what types of inventory you handle, the next big step is deciding how you will measure and control them. Believe me, this is no minor decision. It defines the precision of your data and, above all, your agility to respond to what the market demands.

Basically, there are two main paths: periodic and perpetual control. The difference between them is like comparing a blurry photo you take every now and then with a live, high-definition broadcast of everything happening in your warehouse.

Control systems: periodic vs perpetual

The periodic inventory system is, so to speak, old school. It consists of doing physical counts of the entire warehouse on fixed dates: at the end of the month, quarter, or year. Only when you finish that massive count do you really know how much product you have and can calculate the cost of what you sold.

Imagine a small family hardware store in Tlalnepantla, State of Mexico, that closes one Sunday a month so everyone can count screws, nails, and bags of cement. It is a simple and straightforward method, yes, but it has a huge disadvantage: between one count and another, you are operating blind, relying purely on estimates.

On the other hand, the perpetual inventory system updates your stock in real-time with every movement. Every sale, every return, or every time you receive merchandise from a supplier, the system records it instantly. This is achieved with tools like point-of-sale (POS) systems and barcode scanners.

The perpetual system gives you continuous and precise visibility of your inventory. It's like having a drone monitoring your warehouse 24/7, alerting you to low levels, slow-moving products, and potential discrepancies instantly.

For a coffee shop with several branches in Monterrey, Nuevo León, this system is vital. It allows them to know exactly how many liters of milk are left in each location, when it's time to order more coffee beans, and which desserts are selling the most, all from a single screen. Although the initial investment in technology is higher, the benefit is quickly seen in fewer losses from stockouts and much smarter purchasing. If your goal is to grow, this control is indispensable.

Inventory valuation methods

Now, it doesn't only matter how you count your inventory, but also how you value it. This point is key for your accounting, as it directly affects the cost of goods sold (COGS) and, therefore, your real profit margin. For this, there are three main methods: FIFO, LIFO, and Weighted Average. If you want to dive deeper, there are several inventory control methods that adapt well to today's market.

These are the most used methods:

• FIFO (First In, First Out): This method assumes that the first products that entered your warehouse are the first ones sold. It is perfect for businesses with perishable products. Think of an artisanal ice cream parlor in Yucatán: it has to sell the batches of ice cream it prepared first to guarantee freshness and avoid spoilage.

• LIFO (Last In, First Out): Here the logic is reversed: the last products you bought are the first ones you sell. It is less common for food due to expiration risks, but it can be tax-advantageous in times of inflation. By recording the cost of sales at the most recent (and almost always higher) price, reported utility decreases, which can represent a tax benefit.

• Weighted Average: With this method, you simply calculate an average cost for all identical items you have in stock. Every time you buy a new batch at a different price, the average cost updates. A barista in Cholula, Puebla, who buys coffee beans from different producers at constantly changing prices can use this method to simplify accounting and maintain a stable cost for their drinks.

The right choice will always depend on the nature of your product and your financial goals. To simplify and automate this entire process, it is worth understanding well how a modern inventory registration system works.

Optimize your profitability with ABC inventory classification

Not all products in your warehouse carry the same weight. That's a fact. Some are your business's stars, the ones that really move the needle of your profits, while others simply play a supporting role. Treating them all equally is one of the most common and costly mistakes, as it drains resources and diverts attention from what truly matters.

Exactly to avoid this, there is the ABC classification method, a management technique based on the Pareto principle. The logic is quite straightforward: instead of viewing your inventory as a uniform block, you segment it into three categories (A, B, and C) according to their value and impact on revenue, not just by physical volume. This allows you to focus your energy and control where the return is greatest.

Understanding ABC categories

To make it clearer, let's imagine you run a pharmacy in Puebla. When applying the ABC method, your inventory could be organized as follows:

• Class A - The Vital Ones: These are relatively few products, but they represent the heart of your business. We are talking about approximately 20% of your items, which nevertheless generate about 80% of your revenue. In your pharmacy, these would be specialized, high-cost medicines with constant rotation. They demand tight, almost daily control, strategic negotiations with suppliers, and a well-calculated safety stock so you never run out of stock.

• Class B - The Important Ones: This is the next level in the hierarchy. They make up around 30% of your items and contribute 15% of your revenue. Here we might find vitamins, popular supplements, or skincare products from recognized brands. While they are important, control can be less intensive; weekly or bi-weekly reviews, supported by a perpetual system, are usually sufficient.

• Class C - The Necessary Ones: These products are the vast majority in terms of quantity, occupying about 50% of your inventory, but their contribution to revenue is minimal, just the remaining 5%. Think of cotton, bandages, or hand sanitizer. They are necessary to provide complete service, of course, but they do not justify exhaustive control. With a monthly count and a simple reorder system, their management is more than covered.

ABC classification is not just academic theory; it is an extremely widespread practice in Mexican logistics. In fact, its adoption among SMBs continues to grow, especially in commercial hubs like Monterrey. A recent study revealed that 72% of retail SMBs in LATAM already use this model, optimizing their operational costs by up to 35%.

How to implement ABC classification

The traditional, manual method consists of multiplying the units sold of each item by its unit cost to calculate its annual consumption value. Then, you sort the products from highest to lowest value and group them into categories A, B, and C according to the percentages that best fit your operation.

By applying ABC classification, you stop managing your stock as a homogenous whole and start treating it as an investment portfolio, allocating resources according to the return on each asset.

Fortunately, you no longer have to spend hours on spreadsheets. Modern tools, like POS and CRM systems, automate this analysis entirely. A good system processes your sales and cost data to classify your inventory instantly, eliminating manual labor and potential errors. This analysis is also key to understanding the true profitability of each product, a concept we detail in our guide on how cost of goods sold is determined.

Mastering this technique will not only help you optimize storage costs but also minimize the risk of running out of your star products and free up capital that was previously tied up in slow-moving inventory.

Frequently asked questions about inventory types

We've seen the theory, now let's go to practice. It is normal that after reviewing the different types of inventory that exist and their strategies, questions remain about how all this applies to the daily chaos of a business.

Let's solve the most common doubts so you can get to work without hesitating.

What are the most important inventory types for a restaurant?

In any food business, from a taco stand in the State of Mexico to a signature restaurant in Monterrey, control focuses on three inventories that are live and constantly moving:

1. Raw materials: These are your base ingredients, both perishable and non-perishable. Everything falls here: from avocados for guacamole and meat for tacos, to flour sacks and spices.

2. Work in process (WIP): Think of this as your mise en place on a large scale. These are the preparations you make ahead of time so the kitchen flies during service, like mother sauces, base broths, or already marinated pastor meat.

3. Finished goods: These are items you sell as is, without needing to cook them. Bottled drinks, craft beers you offer, or those desserts you buy from an external supplier are the perfect example.

Real control comes from linking raw materials to your recipes. That way, you know exactly how much each dish costs you (your COGS) and you can directly tackle waste from expiration.

If I use a perpetual system, do I need to do physical counts?

Yes, and it is non-negotiable. Although a perpetual inventory system is a marvel that updates your stock in real-time with every sale, daily reality is another thing. There will always be discrepancies.

Periodic physical counts, better known as cycle counts, are your safety net. They help you detect and correct those differences that arise from petty theft, products that got damaged and no one reported, or simple human errors when receiving an order.

Instead of paralyzing your business for a whole day for a massive count, cycle counting allows you to be more strategic. Review your star products (Class A) every week, those of medium importance (Class B) every month, and slow-moving ones (Class C) quarterly. This way, you maintain the accuracy of your data without sacrificing your sales.

What is inventory turnover and why is it important?

Inventory turnover is one of the most honest financial health indicators that exist. It tells you, bluntly, how many times you sell and replace your entire inventory in a specific period.

High turnover is almost always great news. It means the product flows, you don't have money stuck in boxes, and your sales strategy is working. Conversely, low turnover is a red flag that can point to weak sales or, worse, that you overbought.

For an ice cream parlor in the Riviera Maya, Yucatán, during the summer, for example, monitoring the turnover of certain flavors is key to not running short of the best seller or ending up with freezers full of a flavor that didn't catch on.

How does a CRM help me manage my inventory?

This is where things get interesting. A CRM, especially if integrated with your point of sale, creates a direct bridge between your warehouse and your customers. It stops being just "stock" and becomes "products people want."

It allows you to see with first and last name who buys what and how often. With that information, you can launch surgical marketing campaigns to move inventory smartly.

Imagine a barbershop in the Polanco area of Mexico City with an excess of seasonal beard oil. Instead of putting it on clearance, it can send an exclusive promotion via WhatsApp to all customers who have bought that product before. Not only do you liquidate stock that could become obsolete, but you also strengthen loyalty and trigger a new purchase.

Understanding and mastering the different types of inventory that exist is not just an administrative task, it is a pillar for your business to grow sustainably. With Swirvle, you have the tools to make this control simple and effective. We integrate your point of sale, precise stock control, ABC analysis, and a powerful CRM so your products and your customers are always connected.

Discover how we can help you transform your inventory into your best competitive advantage at https://swirvlehub.com.