There's a slow week most trades hit right at the end of December. The phone quiets down, the schedule thins out, and for once you're not racing to the next job. It's the best shot you'll get all year to deal with the books, and it's also the week most of us spend doing anything but.
Here's what's waiting, though. A year of bank and card exports you've never opened, a camera roll full of blurry receipt photos, a pile of invoices in three different apps, and that one folder in the truck's center console. Come January your accountant or bookkeeper sends the usual text asking for "everything," and the scramble begins.
The good news is that the quiet weeks before year-end are exactly when AI earns its keep. Not for sorting one receipt at a time, you've got apps for that, but for turning twelve months of mess into clean, categorized summaries somebody can actually file from. Let's walk through how.
Start by getting everything in one pile
AI can't summarize what it can't see, so the first job is boring and human: gather the raw records in one place. Think of it as staging materials before the real work starts.
You're after four things, and most of them you can export in a couple of clicks:
- Bank statements for every business account, downloaded as CSV (a spreadsheet file) or PDF for the full year.
- Credit card exports for any card you run business charges through, same format, same twelve months.
- Receipt photos from your phone, the glovebox, the junk drawer. Even the faded ones.
- Invoices you sent, from whatever tool you quote and bill in.
Dump it all into one folder. Name it something dumb and obvious like "2025 taxes" so you find it again in ten minutes, not ten days. You don't need it perfect. You need it together.
Let AI draft your category totals
This is where the hours come back. Hand an AI tool your bank and card exports and ask it to group the transactions into the categories your accountant uses: materials, fuel, tools, subcontractors, insurance, vehicle, office, and so on. In a few minutes you get a draft summary with totals per category instead of a 400-line statement nobody wants to read.
A good prompt is plain. Something like: "Here's my business checking export for the year. Group these charges into expense categories, total each one, and list anything you're not sure how to categorize." That last part matters, and we'll get to why.
What you'll have at the end is the skeleton of the summary your bookkeeper actually wants. Totals that tie back to real transactions, sorted the way a tax return gets built.
Where it guesses wrong (check this before anything gets filed)
The tool is genuinely good at sorting obvious charges. Home Depot goes to materials, the gas station goes to fuel, your carrier goes to insurance. It's confidently wrong on the fuzzy ones, though, and you have to catch those yourself.
Watch these in particular:
- Big-box and warehouse stores. A Costco run might be shop supplies, might be the break-room coffee, might be personal. AI guesses, often wrong.
- Owner draws and transfers. Money you moved to yourself isn't an expense. It'll sometimes land in one anyway.
- Loan and equipment payments. The interest is deductible, the principal isn't, and AI rarely splits them right.
- Anything labeled just "payment" or a bare name. Those get a shrug and a guess.
Treat the draft as a first pass from a sharp but green apprentice. Fast, helpful, needs a look before it goes out. Spend your saved hour reviewing the flagged lines instead of keying in all 400.
Flag the subs who need a 1099
If you paid an unincorporated subcontractor or independent worker more than $600 across the year, you generally owe them a 1099-NEC form, and the deadline is the end of January. Miss it and you're looking at penalties that climb the longer you wait.
That's a chore AI handles well. Ask it to scan your payments and list everyone you paid more than $600 who looks like a contractor rather than a vendor or supplier. You'll get a short list in seconds.
Then do the human part. For each name on that list, make sure you've got a current W-9 (the form with their legal name, address, and tax ID) on file. If you're missing one, late December is a far better time to chase it than January 28th. Ask us how we know.
One honest limit: AI can't always tell a corporation from a sole proprietor, and corporations usually don't need a 1099. The W-9 settles it. So use the AI list to know who to ask, not as the final word on who gets a form.
Dig up the deductions you forgot
The expenses that cost you money at tax time aren't the big ones. Those you remember. It's the small, scattered, easy-to-forget charges that never make it onto the return, and there's a year of them buried in your statements.
Ask AI to comb your exports for commonly missed business deductions and list them with dates and amounts. It's good at surfacing things like:
- Software and app subscriptions that auto-renew so quietly you forgot you pay them.
- Phone and internet, where a share of the bill is usually deductible.
- Tools and small equipment bought in ones and twos across the year.
- Vehicle costs beyond fuel: registration, repairs, part of the insurance.
- Trade dues, licenses, continuing education, work boots and gear.
You still decide what's legitimately business and what isn't, and your accountant still has the final call on the rules. But a prompted list of real charges beats trying to remember in April what you bought last February.
Hand it off clean
Your accountant bills by time, or by how much cleanup your shoebox needs. Give them totals that tie to statements, a 1099 list with W-9s attached, and a note of anything you weren't sure about, and you've just made yourself the easy client. That tends to show up in the bill.
Package the handoff simply:
- The category summary, with your corrections already made.
- The raw exports behind it, so they can check anything.
- The 1099 list and the W-9s you collected.
- A short "questions" list of the charges you couldn't place.
One more honest limit worth saying out loud. AI drafts and sorts and flags; it doesn't know tax law, and it shouldn't file anything. The point isn't to replace your accountant. It's to stop paying them to untangle a mess you could've handed over clean.
Worth doing this week
You don't need the whole year sorted by Friday. You need to start while the shop's quiet.
- Make the folder. Export this year's bank and card statements into it, as CSV if you can.
- Run one month through an AI tool and ask for category totals plus a list of what it couldn't place. See how it feels before you do twelve.
- Ask for the list of subs you paid over $600, and start chasing any missing W-9s now.
- Have it pull commonly missed deductions from a single month, just to see what you've been leaving behind.
- Send your accountant a quick note that cleaner records are coming. They'll be glad, and it holds you to it.
If any of this feels like one more thing you don't have time to set up, that's the part we help with at Massachusetts AI Agency: building the handoff once so next December is twenty minutes, not a lost week.