A shop you've supplied for six years calls at 7:40 on a Monday. They're out of the pleated filters they buy by the case, a crew's parked on a job waiting for them, and they need a dozen today. You've got them on the shelf, so you save the day. Feels good. But that call didn't have to be a scramble.
Your regular accounts burn through the same stuff on a schedule they don't even think about. Filters, fittings, lubricants, gloves, whatever it is, it goes out their door at a steady pace. They notice only when the shelf is empty, and by then they're in a hurry. If you're on another line or out on a delivery when they call, they'll try the next supplier who picks up first. One slow morning can cost you an account you've had for years.
The fix isn't a fancy inventory system on their end. It's a quiet nudge from you, timed to when they usually reorder, that lands a few days before they run dry. Something like "looks like you might be getting low on the 20x25 filters, want me to set a case aside?" Nothing pushy. Just the counter guy remembering, done for every account at once.
Your invoice history already knows the cadence
You don't need to guess at any of this. The pattern is sitting in your invoicing or accounting software right now. For each regular account you're after two things: what they buy on repeat, and how many days usually pass between those orders.
Take one account and pull their last year of invoices. Sort by item. If they order the same case of lubricant every five or six weeks like clockwork, that's your interval. Some accounts wander more than that, and it's fine, you're after a rough window, not a precise date.
- Export the last 12 months of invoices for the account.
- Group by item or SKU, and keep the ones they bought three or more times.
- Note the average days between orders for each repeat item.
- Note the date of their most recent order.
- Add the interval to that last date, and you've got a rough "check in around here" date.
Do this for your top 20 or 30 accounts first. That's where the money is, and it's a couple hours of work, not a quarter-long project. A spreadsheet is plenty to start with. You can hand the pattern-watching off to software later, once you've seen it pay off once or twice.
Draft the nudge so it reads like your counter guy talking
The message matters more than the timing. A reorder reminder that sounds like a marketing blast gets ignored, or worse, it lumps you in with every other vendor cluttering their inbox. It should read like a text from the person they actually talk to when they call in.
- Name the specific item, not "your supplies." Saying "the 16x20x1 filters" tells them you're paying attention.
- Reference their pace lightly: "you usually grab a case about now."
- Make the yes easy: "want me to set one aside for pickup Thursday?"
- Sign it from a person, not from the company name.
Here's a plain version you can steal: "Hey Mike, it's Dave over at the counter. Looks like you're about due for another case of the 20x25 pleats, you usually come through around the first. Want me to have one ready to grab? Just say the word." That's the whole thing. No graphics, no coupon code, no five paragraphs of pleasantries.
This is where a little AI helps, and where it doesn't. A language model (the tech behind tools like ChatGPT) is good at taking your invoice data and your one good example message, then drafting 30 versions with the right name, item, and interval dropped into each. That's the tedious part gone. What it's bad at is judgment. It doesn't know that one buyer is touchy about being sold to, or that another guy would rather get a call than a text. You keep that part yourself.
Timing: land it before the shelf is empty
Send it too late and you're the reminder they read after they already called your competitor. Send it too early and it's just noise they'll forget by the time they actually need product. The sweet spot is a few days before their usual reorder date, enough lead time for them to say yes and for you to set product aside or get it on a truck.
For most supply items, three to five days ahead of the expected reorder works well. If you run delivery routes, tie the nudge to the run that serves their part of town, so a yes turns into a drop the same week instead of a special trip across the Loop. During the summer stretch when your HVAC accounts are chewing through filters faster than usual, tighten the window, because a five-week cadence in April might be running closer to four in August.
Which accounts to leave alone
Not every account wants a nudge, and sending one to the wrong customer costs you goodwill you can't easily buy back. Some buyers hear a reminder as you telling them how to run their shop. Others order on their own tight system, and your message just adds clutter to a busy morning.
- Accounts whose orders are all over the map with no real pattern (nothing there to predict).
- Buyers who've already told you they handle reordering on their own.
- One-off or project-based customers who aren't coming back on a cycle.
- Anyone who's bristled at follow-up before. You know who they are.
When you're not sure, ask once, in person or on the next call. "Want me to give you a heads up when you're getting close on the filters?" Most will say yes and thank you for it. The ones who say no just told you exactly who to skip, and that's worth knowing too.
Worth doing this week
You don't have to build the whole thing at once. Start small and let one won-back reorder prove it out for you.
- Pick your ten best repeat accounts and pull their last year of invoices.
- For each one, find the one or two items they reorder and the days between orders.
- Write a single honest reminder message you'd be fine receiving yourself.
- Send it by hand to the two or three accounts due in the next week, and see who bites.
- If it lands, that's when it's worth automating the drafting and the timing.
Get this running and the panic Monday call turns into a quiet Thursday pickup that was already boxed and waiting. If you'd rather not wire up the invoice pull and the drafting yourself, that's the sort of thing we set up for Houston suppliers at AI Agency Houston, but the spreadsheet version is yours to run today.