The Excel tax: what mid-market planners are actually paying to stay stuck

There’s a spreadsheet open on someone’s screen right now with 47 tabs, a VLOOKUP that breaks every Friday, and a forecast that’s already three weeks out of date. And somewhere nearby, a demand planner is manually reconciling it against a report they pulled from their ERP — because that’s the process.

This isn’t a story about bad planners. It’s a story about the wrong tool for the job.

Mid-market companies have been running supply chain planning out of Excel for years, and for a long time, it worked well enough. The business was smaller. The SKU count was manageable. One or two people could hold the plan in their heads and keep things moving.

That was then.

What is the Excel Tax really costing you?

Excel doesn’t send you a bill for the time your team spends maintaining it. That’s what makes it so easy to underestimate. The cost doesn’t show up as a line item — it shows up as a planner who spends Monday rebuilding last week’s forecast instead of analyzing it. It shows up as a stockout you didn’t see coming because the demand signal was buried in a tab nobody updated. It shows up as a markdown you had to take on inventory that was ordered three months ago, based on a number that was already wrong.

Call it the Excel Tax. It’s not a fee you pay once — it’s a recurring charge on your team’s time, your inventory accuracy, and your ability to respond when the plan meets reality. And it’s compounded by a problem most teams don’t want to admit: 94% of spreadsheets used in business decision-making contain errors — meaning the plan your team is working from may already be wrong before the week starts.

For mid-market companies growing faster than their planning process can keep up with, the tax compounds every quarter.

Is your spreadsheet load-bearing infrastructure?

To be clear: Excel isn’t a bad tool. It’s an extraordinary tool for a lot of things. Forecasting at scale, across a growing product catalog, with multiple channels and shifting demand patterns, isn’t one of them.

The problem isn’t that planners use Excel — it’s that Excel has become load-bearing infrastructure. When one person’s workbook is the system of record for your inventory position, your demand plan, and your replenishment decisions, you don’t have a planning process. You have a single point of failure with a password.

And when that person is out sick, onboarding someone new, or just trying to get through quarter-end, the whole plan gets shaky.

What does better supply chain planning actually look like?

Dedicated supply chain planning software isn’t about replacing your team’s judgment — it’s about giving them a foundation they don’t have to rebuild every week.

When your demand forecast is pulling from live data instead of a manually updated file, your planners spend their time on decisions, not maintenance. When inventory signals are connected to your replenishment process, you’re reacting to what’s actually happening in the market — not to what someone captured in a spreadsheet two weeks ago.

Deposco’s supply chain planning solution is built for mid-market companies that need to move fast without a multi-year implementation or a dedicated admin to keep things running. It connects to your existing systems, gets your team productive quickly, and starts returning value before the novelty wears off.

The Excel Tax is real — but it’s also optional. The question is how long you’re willing to keep paying it.