Building a Simple Financial Model

A financial model isn't a crystal ball — it's a structured way to think through whether your business makes sense financially before you spend a lot of money finding out.

Even a rough model forces you to answer questions you might otherwise avoid:

• ›How many customers do I need to break even?
• ›What happens to my margins if my costs go up 20%?
• ›When do I run out of cash?

A full financial model has three statements. Here's what each does:

1. Profit & Loss (P&L) / Income Statement — Shows revenue minus expenses = profit or loss over a period of time.

2. Cash Flow Statement — Shows actual cash moving in and out. A business can be "profitable" on paper but run out of cash — this statement shows you when.

3. Balance Sheet — A snapshot of what you own (assets), what you owe (liabilities), and what's left (equity). Less critical at the early stage.

For most early founders, focus on the P&L and cash flow.

Start with the simplest possible model:

Units × Price = Revenue

Example: If you sell 50 coaching sessions per month at $150 each, that's $7,500/month revenue.

Build monthly projections for 12 months. Start conservatively — it always takes longer to ramp than you think.

Ask yourself: "What does it take to achieve this number?" If you need 50 clients, how do you get them? This keeps your model honest.

Separate costs into two types:

Fixed costs — The same every month regardless of sales: rent, software subscriptions, insurance, loan payments, your own salary.

Variable costs — Change with your sales volume: materials, shipping, transaction fees, contractor pay, commissions.

Add them up for a monthly cost total.

Break-even is when revenue = total costs. Before break-even, you're losing money. After, you're profitable.

Formula: Break-Even Revenue = Fixed Costs ÷ Gross Margin %

Example: Fixed costs of $3,000/month, a product that sells for $100 and costs $40 to deliver (a 60% gross margin) breaks even at $3,000 ÷ 0.60 = $5,000/month revenue (50 units).

Now try it with your own numbers below.

Even if your P&L looks profitable, check your cash. Track:

• ›When does revenue actually hit your bank account? (customers may pay late)
• ›When are your big expenses due? (annual insurance, quarterly taxes)

A business can be profitable and still run out of cash. This is the #1 surprise for new founders.

• ›A simple P&L and cash flow projection is enough to start — build it in a spreadsheet
• ›Revenue projections should be conservative and tied to a plan to acquire customers
• ›Know your break-even number and work backwards to a sales goal
• ›Model "what if" scenarios: what if revenue is 30% lower than expected?
• ›Update your model every month with actual numbers