December is a strange month inside a startup. Sales is sprinting to close the quarter, product is shipping one last thing, and finance — if there is a finance person — is trying to keep up with all of it. The books get pushed to January. Then January arrives with payroll, tax forms, and a fresh budget to build, and the whole thing compounds.
A better plan: spend a few focused hours in December cleaning up what you already have. Reconcile the accounts, collect the documents, and set next year's budget while this year's numbers are still fresh in your head. Here is a checklist that works whether you're a team of five or fifty.
Reconciliation is not glamorous, but it's the foundation for everything else on this list. If your ledger doesn't match your bank, every number you build on top of it is a guess.
Work through them in order of activity. Start with the operating account, because that's where the volume is and where surprises hide. Then credit cards, then your payment processor payouts — those are the trickiest because of processing fees, refunds, and chargebacks that never quite line up on the first pass. Payroll and savings accounts come last.
When a balance doesn't match, ask two questions. Is the difference a timing issue, like a check that cleared after the statement date? Or is it a transaction you never recorded? Nine times out of ten it's the second one.
If you run accrual accounting, close the loop on December obligations. Did anyone do work for you in December that you won't be invoiced for until January? Log the expense now, not when the bill shows up. Your accountant will thank you, and your January numbers won't lie to you.
Every chart of accounts develops a few categories that slowly become meaningless. "Software" swallows hosting, design tools, and that analytics subscription nobody remembers approving. "Miscellaneous" is a confession, not a category. "Professional services" hides legal, accounting, and contract engineering in one unhelpful pile.
Spend an hour splitting these. Then fix duplicate vendor names — if Amazon Web Services, AWS, and Amazon Web Svcs all exist as separate vendors, your spend report is fiction. Merge them.
While you're in there, scan for personal expenses that ran through the company card. Coffee, a flight, a new monitor for the home office. Whether these become owner distributions, reimbursements, or something else depends on your entity structure and where you're based, so flag them and check with your accountant rather than guessing.
Recurring charges are where startup budgets quietly leak. Pull every recurring payment from the last twelve months and put it in one list. Then work through it:
Downgrading to a free tier during a quiet period is a legitimate move. So is pausing a tool for two months while the team is heads-down on a launch.
January is a bad time to discover that a contractor never sent you a W-9. Collect paperwork now, while people are still answering email and before the holiday slowdown turns every request into a three-week wait.
In the U.S., businesses generally need to issue 1099-NEC forms to contractors paid $600 or more during the year, and W-2s to employees, with deadlines falling in late January. Rules vary by country, entity type, and how your workers are classified — confirm the specifics with your accountant rather than relying on a blog post, including this one.
While you're at it, assemble the records your tax preparer will eventually request:
Drop everything in one shared folder. The goal isn't a perfect archive — it's not spending three days in March hunting for a document you had in December.
Before you plan next year, look honestly at this one. Gross margin, burn, and runway, calculated from actuals rather than from the model you built last winter. If you have customers, look at acquisition cost and churn. If you don't, look at how fast the team is spending relative to what's been built.
Runway is simple arithmetic: cash on hand divided by your average net burn over the last three months. If that number is lower than you expected, December is a much better time to know than March. You still have options — cutting a tool, delaying a hire, starting a raise early. Those options shrink as the number does.
Most startup budgets fail in the same way: revenue is budgeted optimistically and costs realistically. Flip it. Be conservative about what comes in, and give yourself permission to spend when it actually does.
Build three versions. A base case, a lean case where revenue lands late and you cut discretionary spend, and a growth case that assumes the round closes or the pipeline converts. The base case should be the one you hire against.
Then make it real. Assign an owner to each major line — someone who actually watches it. Schedule a monthly review and put it on the calendar now, before the year fills up. A budget nobody owns is a wish with a spreadsheet attached.
You don't need to finish everything. You need to finish the things that get harder in January. In the final week, do these four:
That's it. Not a transformation, just a clean handoff to the version of you who shows up in January with a full inbox. Give that person accurate books, a folder of documents, and a budget with a name next to it. It's a small gift, and it pays for itself before the first payroll run.
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