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F4: Financial Architecture

The question: Do your unit economics support growth, and is your cash flow structured to survive long enough to reach it?

Why this step matters

Most service businesses that fail do not fail because they have no clients. They fail because they run out of cash while waiting for deals to close, or because the economics of their service model cannot support the overhead of a growing team.

F4 establishes the financial architecture that determines whether your business can survive growth -- not just generate revenue. It covers unit economics, cash flow management, and capital allocation priorities.

Unit Economics

The five numbers every B2B service founder must know cold:

CAC (Customer Acquisition Cost): Total cost to acquire one new client. Includes sales time, marketing spend, tools, referral fees. Most founders dramatically undercount this because they do not include founder time.

LTV (Lifetime Value): Total revenue a client generates across their full engagement. For retainer models: monthly fee x average client tenure. For project models: average deal size x repeat purchase rate.

LTV:CAC Ratio: The health metric for your revenue model.

  • Below 3:1: You are buying revenue unprofitably. Every new client costs more to acquire than they return. Do not scale.
  • 3:1 to 5:1: Minimum viable. You can grow carefully.
  • Above 5:1: Healthy economics. Scaling is appropriate.

Gross Margin: Revenue minus direct delivery costs, as a percentage. The portion of each dollar that funds growth.

  • Below 40%: Too thin to build a team or invest in marketing.
  • 40-60%: Acceptable but constrained.
  • 60-75%: Good. Typical for productized services.
  • Above 75%: Excellent. Typical for knowledge-based or methodology-led services.

Payback Period: Months to recover the cost of acquiring one client. Under 6 months is excellent. Over 18 months is dangerous -- you are permanently in cash-negative territory on new clients.

Unit Economics Benchmarks

Metric Poor Acceptable Good Excellent
LTV:CAC <2:1 2-3:1 3-5:1 >5:1
Gross Margin <40% 40-60% 60-75% >75%
Payback (months) >18 12-18 6-12 <6
Monthly Churn >10% 5-10% 2-5% <2%
Revenue per Employee <$100K $100-200K $200-300K >$300K

Cash Flow Rules

Cash flow kills service businesses faster than any other factor. Revenue on paper does not pay salaries.

Collection rules:

  • Invoice on delivery, not at project close. Do not wait.
  • Day 1: Invoice sent
  • Day 7: Friendly reminder if unpaid
  • Day 14: Direct follow-up with escalation to decision-maker
  • Require 50% upfront on new client engagements. Non-negotiable.

Payment rules:

  • Pay your own bills on the date due, not early. Keep cash working.
  • Negotiate net-30 with all vendors.
  • Never use accounts payable to fund operations. If you are delaying vendor payments to make payroll, there is a structural cash problem to address.

Reserve targets:

  • 3 months cash reserve: Minimum viable. One bad quarter or one large client exit will not kill you.
  • 6 months reserve: Stable. You can make growth investments without existential risk.
  • 12 months reserve: Strong. You are running the business, not surviving it.

Weekly cash forecasting: Every week, update a simple forecast: Starting cash + Expected in (this week) - Expected out (this week) = Ending cash. Extend 4 weeks. If any week goes negative, that is the problem to solve now, not at month end.

Capital Allocation Framework

When you have cash available to invest, the priority order:

  1. Delivery quality and reliability: Fix anything that causes client churn. Losing a client to poor delivery is the most expensive thing that can happen -- you lose the LTV and bear the replacement CAC.

  2. Revenue-generating systems: Invest in the Growth pillar bricks (G1, G2, G3) that most constrain pipeline. Revenue solves almost every other problem.

  3. Operational leverage: Automation and systems that reduce hours required to deliver the same revenue. This is how margin expands without cutting.

  4. Team expansion: Only after delivery quality is secured and revenue systems are working. Hiring before systemizing multiplies chaos.

  5. Strategic bets: New products, new markets, major infrastructure. Only from surplus after priorities 1-4 are funded.

Questions to answer in writing

  1. What is your LTV:CAC ratio today -- honest estimate using founder time in CAC?
  2. What is your gross margin on your primary service?
  3. How many months of cash reserve do you currently hold?
  4. What would happen to the business if your two largest clients left in the same month?
  5. What are you investing in first -- and does that match the capital allocation priority order?

F4 Summary Template

F4: FINANCIAL ARCHITECTURE

Unit Economics:
- CAC (including founder time): $[amount]
- Average LTV: $[amount]
- LTV:CAC ratio: [ratio]
- Gross margin: [%]
- Payback period: [months]

Cash Position:
- Current cash reserve: [months of runway]
- Collection process: [invoice terms, upfront % required]
- Weekly cash forecast: [in place / not in place]

Capital Allocation (current priorities):
1. [what you are investing in first]
2. [second priority]
3. [third priority]

Gaps to fix before scaling:
- [if LTV:CAC < 3:1: fix business model or CAC first]
- [if gross margin < 40%: fix delivery cost structure first]
- [if runway < 3 months: fix cash collection first]

F4 Assessment

Five questions. Score each 1-10. Total out of 50.

# Question Score
1 Do you know your unit economics (CAC, LTV, margins) cold? /10
2 Do you have 3+ months cash reserves? /10
3 Do you forecast cash weekly? /10
4 Is your LTV:CAC ratio 3:1 or better? /10
5 Do you know your break-even point exactly? /10
F4 TOTAL /50

Below 35: Financial architecture unstable. Fix before scaling.