Growth
Cashflow Forecasting for Startups: Stop Guessing
Oct 25, 2025
Most founders treat cashflow like the weather: they look out the window every morning and hope it doesn’t rain.
Then one day the bank balance hits zero and they panic-raise, fire people, or kill the company.
We’ve seen it hundreds of times.
Here’s the better way — the exact system used by the fastest-growing startups on Tagihly (some now at $5M+ ARR) to never be surprised again.
The 3 Numbers That Actually Matter
Forget 50-tab spreadsheets. You only need to know three things every week:
Runway → How many weeks of cash left at current burn?
Trigger Date → Exact date you drop below 3 months runway (if nothing changes)
Decision Horizon → What you can safely commit to in the next 90 days
Everything else is noise.
The Dead-Simple Forecast Model (10 minutes setup)
Step-by-step — copy-paste this into Google Sheets or use Tagihly’s built-in version.
Month | Starting Cash | Revenue (collected) | Expenses | Ending Cash | Runway (weeks) |
|---|---|---|---|---|---|
Dec 2025 | $120,000 | $45,000 | $62,000 | $103,000 | 19.8 |
Jan 2026 | $103,000 | $52,000 | $65,000 | $90,000 | 16.6 |
Feb 2026 | $90,000 | $58,000 | $68,000 | $80,000 | 14.1 |
… | … | … | … | … | … |
Rules:
Revenue = money actually in the bank (not signed contracts)
Expenses = everything that will definitely leave (salary, rent, ads, etc.)
Update every Monday in 10 minutes
The AI Upgrade (what Tagihly does automatically)
Tagihly pulls your real invoices, payments, and bank transactions, then:
Predicts collection dates with 91% accuracy (based on client payment history)
Auto-adjusts revenue when a client pays early/late
Flags “risky” invoices that will probably push you past the trigger date
Sends you one Slack/email every Monday: “Runway = 17 weeks → hire now” or “Runway = 9 weeks → pause hiring”
Result from 1,200+ startups using it:
Average runway visibility: 94 days (vs 11 days before)
Zero surprise $0 days in the last 12 months
60% fewer “oh-shit” emergency raises
The 3-Month Rule That Saved 40+ Companies
If runway ever drops below 12 weeks → immediately:
Pause all non-essential spend
Shorten payment terms to net-15 on new deals
Turn on aggressive reminders for every overdue invoice
Do this early and you almost never actually run out.
Your 5-Minute Action Today
Open Tagihly → go to Cashflow → click “Turn on Forecast”
It pulls the last 90 days of data and builds the whole model for you.
No spreadsheets. No guessing. Just the truth.
→ Try it free: app.tagihly.com/cashflow
You’ll see your exact Trigger Date in under 60 seconds.
Never be surprised again.
Keep the lights on,
The Tagihly Team
