Inventory Aging & Slow-Mover Report: Stop Cash From Rotting on the Racks
Turn your on-hand inventory with receipt or last-movement dates and cost into an age-bucketed report — 0-30/31-60/61-90/90+ days — that ranks your slowest movers and biggest aged-dollar piles, then emails a monthly aging summary after a manager approves the snapshot.
A logged-in tool where you import on-hand inventory with cost and dates, the agent buckets every line by age, computes aged dollars, ranks the slowest movers, a manager reviews and approves the snapshot, and you email a monthly aging summary and export a clean CSV.
Before you start
- A Supabase account (free)
- A Vercel account (free)
- A Resend account (free)
- An on-hand export with SKU, quantity, cost, and a receipt or last-movement date (CSV or Google Sheet is fine)
- Claude Code or any AI coding agent
The problem this kills
Cash doesn't only leak through bad purchases — it sits quietly on your racks. A pallet received nine months ago that nobody has touched is money you already spent, frozen in a box. Multiply that across a few hundred SKUs and the "aged" pile can be a serious chunk of working capital. But most warehouses can't see it. They know what's in stock; they don't know how old it is, or which slow movers are tying up the most dollars.
When someone finally tries to answer "how much of our inventory is dead?", it's a one-off spreadsheet heroics project: pull the on-hand report, VLOOKUP in the receipt dates, hand-build the age buckets, sort by value, and email a screenshot. It takes a day, it's never repeated the same way twice, and last month's number is gone — so nobody can tell whether aged value is rising or falling.
An inventory aging report should be a standing, governed report that runs every month, ranks the worst offenders by aged dollars, and shows the trend — so finance and category managers can act before the markdown gets ugly.
What you'll build
A simple internal web app for your inventory, finance, and category teams. You import your on-hand inventory — each line with a SKU, the quantity on hand, the unit or extended cost, and a date that tells the tool how old the stock is (either the receipt date or the last-movement date, whichever your business uses).
The tool buckets every line into age ranges — 0-30, 31-60, 61-90, and 90+ days — computes the aged dollar value in each bucket, and ranks your slowest movers so the biggest piles of frozen cash rise to the top. It compares this month's aged value against last month's snapshot and flags categories where aged value is climbing. A manager reviews the snapshot, sanity-checks it, and approves it before it goes anywhere. Once approved, the tool emails a monthly aging summary to finance and category managers and exports a clean CSV.
What's inside the Implementation Plan
The downloadable plan is a step-by-step file you paste into an AI coding agent. It opens by interviewing you about your business — whether you age by receipt date or last-movement date, how your on-hand export is actually shaped and named, whether you track lots, what your bucket boundaries should be, what counts as a "slow mover," and the messy exceptions (consignment stock, in-transit, zero-cost items, negative on-hand). It reflects a short tailored spec back to you and gets your thumbs-up before it builds anything, so the report matches how your warehouse really works — not a generic template.
From there it walks the agent through the data model, the on-hand import with duplicate guards, the aging-bucket engine, the slow-mover ranking, the rising-aged-value trend, the manager approval gate, the Resend monthly email, and the CSV export. Every step ends with a ready-to-copy prompt. There's a full "No API yet?" path that uses a Google Sheet / CSV as the data source and produces a clean CSV export — so you can build and run the whole thing this afternoon regardless of which WMS or ERP you're on.
The governance it includes (this is the point)
This report drives markdown and write-off decisions, so the controls aren't optional. The plan builds in login so only your team can use it, row-level security so you only ever see your own organization's inventory, a complete audit trail of who imported which snapshot and who approved which report, a hard human-approval gate so no aging snapshot is circulated to finance or category teams until a manager signs off, and duplicate guards so the same SKU/lot can't be counted twice within a snapshot.
Who it's for
Inventory managers, warehouse leads, finance and FP&A staff, and category managers — anyone responsible for working capital tied up in stock who's tired of rebuilding an aging spreadsheet by hand and wants a repeatable monthly view of where cash is rotting. If you can export your on-hand with a date and a cost, you can build this.
You've got this — start with the plan, paste the first prompt, and answer the interview. You'll have your first aging snapshot on screen this afternoon.