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Your Spreadsheet Can't Tell You the Month You'll Run Out of Cash. This Can.

#smallbusiness #productivity #excel #automation

Small businesses don't die because they stop making money. They die because the cash runs out before the money arrives — payroll on Friday, invoice paid next month, supplier due Tuesday. The spreadsheet tells you what happened. It won't tell you the month you run dry.

The blind spot: your P&L is a rearview mirror

Income statements and spreadsheets are hindsight. They sum up what already happened. But the question that actually keeps you alive is forward-looking: given my planned income and expenses, which month does my balance go negative?

That's a different calculation — a rolling projection, month by month, with seasonality and one-time costs. It's simple enough to do by hand, tedious enough that nobody does it, and critical enough that missing it kills companies.

What I built: a cash-flow forecaster that yells before you hit zero

A single-file Python tool (pure standard library, zero dependencies) that takes a plain CSV of your income/expense plan and does three things:

  • 12-month rolling forecast — opening balance, income, expenses, net, closing balance for every month
  • Cash-gap alarm — automatically finds the lowest-balance month; if it goes negative you get a 🚨 CASH GAP alert and exit code 1, so you can hang it on a cron and get warned the day it's about to happen
  • Three-scenario simulation — optimistic (income ×1.2), base, pessimistic (×0.8) so you see the range, not one lucky number
  • What-if analysis — --what-if "hire_contractor,-2000,3" to see exactly what a big expense does to your curve before you commit 
# Forecast 12 months from your plan.csv
python cashflow_forecaster.py --data plan.csv --months 12

# See what hiring someone in month 4 does to the cash curve
python cashflow_forecaster.py --data plan.csv --what-if "contractor,-2000,month4"
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Output is Markdown for humans, JSON for your own automation. No cloud, no subscription, no uploading your numbers to someone else's server — your financial plan never leaves your machine.

Why this beats a SaaS dashboard

The market is full of beautiful cash-flow SaaS products. They're $30–100/month, they require onboarding, and they're usually optimized for finance teams that have someone whose job this is. Most independent founders and shop owners just need one honest answer every month: will I run out of cash, and where?

A local tool answers that in 10 seconds, for a one-time price, with your data staying yours.

If you've ever had a "wait, we're low on cash" moment that caught you by surprise, the full kit (forecaster + three-scenario engine + what-if + docs) is at AgentChip.

The spreadsheet is your past. The forecast is your future. Know which month matters.

Originally published on the AgentChip blog.

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