Short answer: Name every job folder like 2601-Smith-AC-install — a job number, the customer's last name, and two or three words of scope. One job, one name, no exceptions. Three months from now, that name still tells you exactly which job a receipt belonged to.
Your Receipts Live Everywhere Except Where They Belong
Ask any small contractor where their receipts are and you'll hear the same list: the truck dashboard, the glovebox, jacket pockets, a group chat with the crew, an envelope somewhere at home. One construction receipt guide describes exactly that scene, and every contractor reading this just nodded.
The same guide points at the real problem: the gap between the day something was bought and the day it gets written down. Everything a receipt doesn't say lives in your memory — and memory has a shelf life of about a week. A receipt tells you $47.32 at the supply house. It doesn't tell you which job. That part lived in your head, and your head cleared it out weeks ago.
So the fix isn't a better envelope. It's giving every job a name so clear that a receipt filed today still makes sense in April. Here's the naming system working contractors actually use — and the five mistakes that break it.
The Formula: Number, Customer, Scope
Every job folder gets one name, built the same way every time:
2601-Smith-AC-install
- 2601 — a job number. One contractor on a woodworking forum summed up the habit well: give every job a number, and put that number on everything connected to the job. The number is the one part that can never be ambiguous, misspelled, or duplicated.
- Smith — the customer's last name, exactly as it appears on the invoice. This is the part your tech recognizes at a glance.
- AC-install — two or three words of scope, copied from the quote or invoice. Not a novel. Just enough to tell this job apart from the customer's other jobs.
This isn't invented theory. One remodeler on the Fine Homebuilding forum described running his whole business off a board with three columns — Name, Job #, Description — with invoices and receipts filed into the matching job folder. Customer, number, scope: three identifiers for one job. The discipline is collapsing them into a single name and using it everywhere.
Two refinements from contractors who've run this for years. First, start the number with the year — 2601 means the first job of 2026. One company that documents its folder system this way notes that searching by job number stays the most reliable method, because street names and spellings vary far more than numbers do. Numbers don't get misspelled. Names do. Second, keep the whole name under about 30 characters so it reads cleanly in a text message.
5 Naming Mistakes That Lose Receipts
Mistake 1: Naming the folder after the customer only
"Mike's bathroom" feels friendly, and even QuickBooks' own community suggests giving each project a "memorable name." It works right up until Mike calls you back. In March you replaced his bathroom fan; in September you're remodeling the whole bathroom. Which folder gets the new receipts? Customer names repeat. Job numbers don't. Keep the customer name as the middle of the folder name, never the whole thing.
Mistake 2: Naming the folder after the work only
"AC install" describes the job perfectly — and describes three other jobs this summer just as well. When your tech is standing at the supply house counter deciding where a $200 receipt goes, "AC install" versus "AC install" is a coin flip. The number at the front is what makes each folder one of a kind.
Mistake 3: The "misc" folder
Every shop has one: the folder where receipts go when nobody can figure out the job in ten seconds. It's where job costing goes to die, because a receipt in "misc" is a receipt assigned to no job at all. Here's the rule that kills it: if you can pin a receipt to one job, it goes in that job's folder. If you can't, it doesn't belong in a job folder at all. A tank of gas that served four jobs isn't "misc" — it's overhead, and it gets its own folder like TRUCK-2026. Forced attribution is worse than none: it makes one job look expensive and the rest look cheap.
Mistake 4: Everyone invents their own numbers
"1042," "Job 12," "#87" — when numbering is improvised, two techs eventually create the same number and receipts for different jobs land in one pile. The number has to exist before the first receipt, not after. One person — usually the owner or dispatcher — hands out the next number when the job is booked. An accounting guide for trades makes the same point about job codes generally: the system works only if the code is applied when the cost is created, because that's the one moment everyone touches the job.
Mistake 5: Finished jobs never leave the list
Forty folders, thirty of them done months ago, all still sitting in the choice list. Techs keep filing new receipts into dead jobs because the dead jobs are still there to pick. When a job wraps, mark its folder completed. It drops out of the active list while every receipt inside stays unchanged and searchable. A naming system without retirement is just a slower mess.
The System on One Card
- Format: 2601-Smith-AC-install — number, customer last name, two or three words of scope.
- Numbering: sequential, never reused. Start with the year (26 = 2026) if you want.
- Wording: customer name and scope match the invoice, so office and field say the same thing.
- Ownership: one person hands out numbers when jobs are booked.
- Length: under about 30 characters.
- One invoice, one folder. Bill it separately, number it separately.
- Done means completed. Finished folders leave the active list.
- Can't attribute it? Don't force it. Overhead gets its own folder — TRUCK-2026, OFFICE-2026 — never "misc."
How This Works With Folder AI
Setup takes under 10 minutes. Then the naming system runs on a simple loop. The first time a job needs a folder, type the full name — 2601-Smith-AC-install — when Receipt AI asks where the receipt goes. That creates the folder. Every receipt after that, you just reply with the folder's number from the list. You type the name once per job; the number does the work hundreds of times.
Because your folder names are readable, the numbered choice list is readable too: "1. 2601-Smith-AC-install, 2. 2602-Johnson-furnace-repair." Your tech picks the right one in seconds, standing at the counter. When the job is done, mark the folder completed and it leaves the choice list — the receipts stay right where they are, searchable any time.
Before and After: One Week at Dan's HVAC Shop
Before. Dan's folder list reads: "Mike's bathroom," "AC install," "Johnson furnace," "misc," "thermostat." Friday afternoon, his tech texts a photo of a capacitor receipt. The choice list is a riddle — which "AC install"? Is the capacitor for Mike's March fan job or the September remodel? He guesses. Sunday night Dan spends an hour re-sorting, and one $87 receipt can't be placed with confidence, so it lands in "misc." His month-end job costs are fiction with confident formatting.
After. Same week, new names: 2601-Smith-AC-install, 2602-Johnson-furnace-repair, 2603-Davis-bathroom-fan. The capacitor receipt arrives, the choice list reads like a menu, the tech replies "2." Ten seconds. Sunday night Dan watches football. Every receipt sits in a folder whose name still explains itself in April.
Frequently Asked Questions
I manage rentals — one client, twenty units. The customer name doesn't help.
Swap the middle segment for the address: 2604-123MainSt-AC-install. The rule isn't "always the surname" — it's "whatever tells you which job at a glance." For a landlord's portfolio, that's the property.
The scope changed mid-job. Do I rename the folder?
No. Renaming breaks the link between the folder's old receipts and its name. Name it from the invoice at the start; if something meaningful changed, add a memo to the new receipts describing it. The folder name is an address, not a diary.
Who hands out the job numbers?
One person — usually the owner or the dispatcher — when the job is booked. The number should exist before the first receipt arrives, because the first receipt is often filed from a supply house parking lot by someone who shouldn't be inventing numbering schemes.
Where does truck fuel go? It's kind of job-related.
Usually not. One tank of gas serves several jobs, so assigning the whole fill-up to one folder makes that job look expensive and the others look cheap. Fuel, insurance, and repairs go in TRUCK-2026. The exception: a cost you can pin to exactly one job — a part bought for that job, equipment rented for that job — belongs in that job's folder.
Do I really need the year in the number?
It's optional, but cheap. It keeps numbers short year after year and makes tax-time filtering obvious. If you'd rather run one endless sequence, that works too — the non-negotiable part is that numbers never repeat.
Start Naming Every Job Today
Receipt AI works over text, WhatsApp, and email — no app to download, and your first 10 receipts are free. Set up your folders with the number-name-scope format, text your next supply house receipt, and reply with the folder number when asked. Owners who file receipts by job number save up to 97% of their bookkeeping time, and if you have QuickBooks Online or Xero, everything syncs cleanly when you're ready.
