Sales and Operations Planning: A Practical Guide to S&OP

9 min read

1. September 2026

The plan always looks solid in the spreadsheet. Growth is broken down by customer, product group, and quarter. The pipeline looks promising. Campaigns are scheduled. The target is clear.

Then the plan hits your supply chain, and the questions start. Can your suppliers keep up? Does the warehouse hold the right products? Is there capacity when demand arrives? And what does the plan mean for capital tied up in inventory, margin, and cash flow?

That's where sales and operations planning comes in. Not as another meeting on the calendar, but as a fixed process where you match expected demand with what the business can actually deliver.

Without a shared planning process, you quickly end up with several versions of the future. Sales looks at pipeline and campaigns. Supply chain leans on historical consumption. Purchasing weighs lead times, supplier terms, and minimum order quantities. Finance watches budget, inventory value, and working capital.

Every department needs its own perspective. But you need one shared plan to make decisions from.

Why does S&OP matter?

S&OP matters because most companies don't lack plans. The problem is that those plans don't fit together.

Sales has one expectation. Purchasing has another. Supply chain works from a third. Finance sees a fourth consequence. And leadership only spots the gap once inventory climbs, customers face stockouts, or margins get squeezed.

A disciplined S&OP process surfaces those disagreements earlier. If the sales plan requires more inventory, that has to come up. If suppliers can't keep pace, it needs discussing. If growth is tying up too much capital, finance shouldn't be the last to find out.

S&OP doesn't just mean more meetings. It requires a shared data foundation where you can see customers, products, suppliers, and inventory together.

The S&OP process: From forecasts to a shared decision

An S&OP process typically starts with demand and ends with an approved plan. But it can't become a linear exercise where each department simply hands off its own numbers.

The process should bring the plan together, challenge assumptions, and force decisions when sales targets, inventory, capacity, and suppliers don't add up.

It typically consists of five parts:

1. Data and baseline

What do historical data, open orders, inventory, forecasts, and performance tell you?

2. Demand review

What do sales, marketing, and product management expect?

3. Supply review

What can inventory, purchasing, production, and suppliers actually deliver?

4. Pre-S&OP

Where are the gaps, conflicts, and decision points?

5. Executive S&OP

What does leadership decide, and which plan applies going forward?

It sounds structured. And it should be. But the value isn't in the process itself — it's in the decisions the process forces.

What happens in an S&OP meeting?

An S&OP meeting shouldn't just be a round of status updates. If the meeting mostly involves each department reporting what has happened since the last meeting, the process gets heavy fast. You end up with more coordination — not necessarily better decisions.

A focused S&OP meeting is about deviations, opportunities, and choices. It brings together the places where the plan doesn't hold up yet: sales plans that diverge clearly from historical demand, products or customers that need extra inventory or a higher service level, suppliers that can't keep up, risks of backorders or delayed shipments, and products tying up capital without supporting growth or customer commitments.

The meeting should end with direction, not just information. That might mean increasing inventory on critical items, adjusting service levels, renegotiating supplier terms, changing the sales plan, or phasing out products that no longer fit.

Sales and supply chain planning: What needs to come together?

Sales ambitions become useful to supply chain when they are translated into concrete consequences. A target of 15% growth isn't enough to act on. What matters is where the growth is coming from, which customers and product groups are driving it, and when that demand is expected.

Only then can you assess the plan properly. Growth doesn't just affect sales — it can change service requirements, inventory needs, capacity, lead times, supplier agreements, and how you prioritize customers.

Sales contributes customer knowledge, pipeline, campaigns, and market signals. Supply chain assesses inventory, capacity, delivery capability, lead times, and risk. Finance translates the plan into margin, cash flow, and working capital consequences.

Put those three perspectives together, and the plan becomes both more realistic and more useful.

S&OP guide: What data should be included?

An S&OP guide should start with data — not because data alone produces better decisions, but because poor data turns the whole process political.

If sales and supply chain don't trust the same numbers, meetings quickly become arguments about the data itself. Then S&OP stops being a decision process. It becomes a debate about who's right.

Focus on the data that has the biggest impact on the plan: historical sales, forecasts, and open orders; inventory levels, backorders, and service levels; supplier performance, lead times, and minimum order quantities; capacity, production, and any picking constraints; campaigns, new products, and discontinuations; and inventory value, margin, and working capital.

Bring those data points together, and you have a much stronger basis for understanding what the plan means for customers, products, suppliers, and inventory across the business.

Demand review: What does the market expect?

Demand review is the part of the process where you assess expected demand. This is where sales, marketing, product management, and sometimes customer service contribute knowledge that historical data alone can't provide — new customers, campaigns, lost deals, price changes, new markets, seasonal swings, or products being phased out.

Demand review can't turn into an optimistic sales pitch. For supply chain to act on the plan, changes in demand need to be translated into concrete consequences.

Campaigns need expected volume and timing. New customers need to be linked to relevant product groups. Products on the way out need a plan for remaining inventory, final purchases, and phase-out.

Product management matters here because the product portfolio is often one of the biggest reasons a demand plan is difficult to translate into inventory requirements.

Supply review: Can you deliver the plan?

A supply review tests whether you can actually meet the expected demand. This is where the plan meets reality.

Ask yourself: Is there enough stock? Can suppliers keep up? Are lead times realistic? Are there capacity constraints? Are minimum order quantities or batch sizes a problem? And where does the service level need protecting?

Supply review should be closely tied to inventory optimization and supplier performance management. Otherwise, you risk judging the plan against old habits instead of current constraints.

If a supplier has low OTIF (On Time In Full), a growth plan for that product group might require earlier purchasing, extra safety stock, a new supplier — or a scaled-back sales ambition.

That needs to surface before the customer feels the problem.

Pre-S&OP: Where are the decisions made?

Pre-S&OP is where conflicts are brought together and turned into clear choices. It's not just about confirming that the plan doesn't add up — it's about deciding what can be resolved within sales, supply chain, and the other functions involved, and what needs to be escalated.

Typical decision points include whether the growth plan requires higher inventory for a period, whether service levels should be adjusted on selected items, whether sales should prioritize some customers over others, whether supplier terms need renegotiating or alternatives need to be found, and whether the product portfolio needs cleaning up before you build more inventory.

Sometimes the problem isn't inventory at all.

It might be an assortment that's grown too wide, products tying up capital without supporting the plan, or suppliers that can't support the growth ambition.

Pre-S&OP and executive S&OP don't necessarily need to be separate meetings. If the people involved have the authority to make the required decisions, they can make them there. The important part is that unresolved trade-offs reach the people who have the authority to resolve them.

Executive S&OP: One plan, one owner

Executive S&OP is the point where decisions that require broader authority are made.

That might include choices around growth, risk, capital tied up in inventory, supplier strategy, capacity, customer commitments, or priorities within the product assortment. In some companies, these decisions happen in a separate leadership meeting. In others, the right decision-makers are already part of the S&OP process.

What matters is not another meeting. It's clear decision rights and ownership.

S&OP shouldn't end with "let's follow up next time." It should end with a decision and clear ownership: which sales targets apply, which products and customers get priority, where you accept risk, where you choose to tie up capital, and who is responsible for acting on those decisions.

A shared plan only works if someone is accountable for the choices behind it.

What's the difference between S&OP and forecasting?

A forecast is a projection of future demand. S&OP is the process where you decide how you'll act on that projection.

A forecast can show that demand is expected to rise. S&OP assesses whether you can actually meet that increase, what it requires from inventory and suppliers, what risks come with it, and whether the plan still makes financial sense.

The forecast is input. S&OP is the decision process.

If the forecast isn't considered alongside inventory, capacity, the product portfolio, suppliers, and finance, you'll still struggle to turn expectations into action.

S&OP and capital tied up in inventory

S&OP directly affects how much capital gets tied up in inventory. If the sales plan increases, inventory can rise. If forecasts are uncertain, safety stock grows. If suppliers are unreliable, buffers get built. If the product assortment widens, inventory gets more complex.

Without S&OP, finance often only sees the consequences afterward. With S&OP in place, you can discuss capital tied up in inventory before it happens.

That doesn't mean inventory should always be kept low. Sometimes higher inventory is a deliberate and sensible decision if it protects growth, customers, or production.

The problem is when capital gets tied up without anyone actually deciding that it should. That's why S&OP should make the trade-off between inventory, working capital, and business priorities explicit.

How to get started with S&OP

Start small. Pick a product group, business area, or part of the company where the gap between sales and supply chain is already causing problems — high levels of capital tied up in inventory, backorders, campaigns, new products, unstable suppliers, or forecasts that rarely match reality.

Then build a fixed rhythm:

Bring together one shared dataset for sales, inventory, suppliers, products, and finance.
Run a demand review with a focus on changes, not just historical data.
Run a supply review, testing the plan against inventory, capacity, and suppliers.
Use pre-S&OP to spell out the choices leadership needs to make.
Close with executive S&OP, where one plan gets approved.
Follow up on deviations so the process learns from month to month.

The goal isn't to build a perfect S&OP process from day one. The goal is to stop letting each department plan on its own.

S&OP creates value when the plan becomes shared

S&OP isn't valuable because you hold more meetings. It creates value when sales and supply chain start managing against the same plan.

When you translate sales ambitions into consequences for inventory, suppliers, capacity, and finance, decisions become more concrete. You can see where growth requires investment. Where inventory is getting too heavy. Where suppliers can't keep up. Where the product assortment is creating unnecessary complexity.

That makes the plan more honest. And far more useful.

Because it's not only about forecasting demand.

It's about deciding what you're going to do about it.

Frequently asked questions about sales and operations planning

Sales and operations planning, or S&OP, is a cross-functional planning process that brings sales, supply chain, purchasing, inventory, finance, product management, and leadership into a single shared plan.

The purpose of S&OP is to balance expected demand with the business's ability to deliver. The process helps reconcile sales targets with inventory, capacity, supplier constraints, and financial trade-offs.

A typical S&OP process includes data preparation, demand review, supply review, pre-S&OP, and executive S&OP. The process ends with one approved plan the business can manage against.

An S&OP meeting should focus on deviations, risks, opportunities, and decisions — not just status updates. The goal is to clarify where the plan requires action across sales, supply chain, finance, and leadership.

Forecasting is a projection of future demand. S&OP is the process where you decide how to respond to that forecast through decisions about inventory, capacity, suppliers, the product portfolio, and finance.

Sales, supply chain, purchasing, inventory, finance, product management, and leadership should all be involved. Not everyone needs to attend every meeting, but their data and decisions need to feed into the process.

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