Fractional CFO Services for SaaS

CFO Services for SaaS Companies

Expert fractional CFO services for B2B and B2C SaaS startups. Monthly SaaS metrics dashboards (MRR, ARR, churn, CAC, LTV), Rule of 40 optimization, unit economics modeling, fundraising financial models, board presentation packages, and burn rate/runway forecasting.

$5K-$15K/mo
Fractional CFO Cost
40%
Rule of 40 Target
3:1
Ideal LTV:CAC Ratio
18 months
Recommended Runway

Comprehensive CFO Services for SaaS Startups

We provide the strategic financial leadership and operational rigor that SaaS companies need to scale efficiently, raise capital, and achieve sustainable growth.

Monthly SaaS Metrics Dashboard

Track the metrics that matter for SaaS: MRR, ARR, net revenue retention, churn, CAC, LTV, payback period, and more. Real-time visibility into business performance.

Key Metrics We Track:

Revenue Metrics:

  • • MRR (Monthly Recurring Revenue)
  • • ARR (Annual Recurring Revenue)
  • • New MRR vs. Expansion vs. Churn
  • • ARPU (Average Revenue Per User)

Growth Metrics:

  • • MRR Growth Rate
  • • Net Revenue Retention (NRR)
  • • Gross Revenue Retention (GRR)
  • • Logo Retention Rate

Customer Metrics:

  • • Customer Acquisition Cost (CAC)
  • • Lifetime Value (LTV)
  • • LTV:CAC Ratio
  • • CAC Payback Period

Efficiency Metrics:

  • • Rule of 40 Score
  • • Magic Number
  • • Sales Efficiency
  • • Burn Multiple

Deliverable:

Monthly dashboard (Google Sheets or Excel) with automated data pulls, trend analysis, cohort breakdowns, and commentary on key movements. Board-ready format.

Rule of 40 Optimization

The Rule of 40 (Growth Rate % + Profit Margin % ≥ 40%) is the gold standard for SaaS health. We help you optimize the balance between growth and profitability.

Rule of 40 Formula:

Revenue Growth Rate % + EBITDA Margin % ≥ 40%

Example: 60% growth + (-20%) EBITDA = 40% ✓

Example: 30% growth + 15% EBITDA = 45% ✓✓

Early Stage (Pre-$10M ARR):

Prioritize growth (60-100%+ YoY). Negative EBITDA is acceptable if Rule of 40 > 40%. Focus: land and expand, product-market fit.

Growth Stage ($10M-$50M ARR):

Balance growth (40-60%) with path to profitability. Target Rule of 40 > 50%. Focus: sales efficiency, unit economics, market expansion.

Scale Stage ($50M+ ARR):

Moderate growth (25-40%) with strong profitability (15-25% EBITDA). Rule of 40 > 60%. Focus: operational excellence, margin expansion, market leadership.

Unit Economics Modeling

Build detailed unit economics models showing LTV, CAC, payback period, and contribution margin by customer segment, pricing tier, and acquisition channel.

What We Model:

  • LTV (Lifetime Value): Average revenue per customer over their lifetime, accounting for churn, expansion, and gross margin
  • CAC (Customer Acquisition Cost): Fully-loaded cost including sales, marketing, onboarding, and allocated overhead
  • Payback Period: Months to recover CAC from gross profit dollars
  • Contribution Margin: Revenue minus variable costs (hosting, support, etc.)

Healthy SaaS Benchmarks:

  • • LTV:CAC ratio: 3:1 or higher
  • • CAC payback: <12 months
  • • Gross margin: >75%
  • • NRR: >100% (net expansion)

Warning Signs:

  • • LTV:CAC ratio: <2:1
  • • CAC payback: >18 months
  • • Gross margin: <60%
  • • NRR: <90% (net churn)

Fundraising Financial Models

Build comprehensive 3-5 year financial models for Series A/B/C fundraising. Scenario planning, sensitivity analysis, and investor-grade presentation.

Model Components:

  • • Revenue build-up (new bookings, expansion, churn by cohort)
  • • Headcount plan by department with loaded costs
  • • Marketing spend allocation by channel with ROI assumptions
  • • P&L, balance sheet, and cash flow statement
  • • Key metrics dashboard (MRR, CAC, LTV, Rule of 40)
  • • Use of proceeds and milestone tracking

Scenario Planning:

  • Base Case: 50% probability, realistic assumptions
  • Upside Case: 25% probability, accelerated growth
  • Downside Case: 25% probability, conservative growth
  • • Sensitivity tables for key assumptions (CAC, churn, pricing)

Why Investors Love Our Models:

Transparent assumptions, cohort-based revenue, realistic burn, clear path to profitability or next milestone. Answers investor questions before they're asked.

Board Presentation Packages

Monthly or quarterly board decks presenting financial performance, key metrics, strategic initiatives, and asks. Designed to keep your board informed and engaged.

Typical Board Deck Structure:

  1. Executive Summary: 1-slide overview (revenue, burn, runway, key wins/challenges)
  2. Financial Performance: P&L vs. budget, cash position, runway forecast
  3. SaaS Metrics: MRR/ARR, growth rate, churn, CAC, LTV, Rule of 40
  4. Customer & Product: New logos, expansion, churn analysis, product updates
  5. Team & Operations: Headcount, hiring plan, key roles, org changes
  6. Strategic Initiatives: Key projects, milestones, OKRs progress
  7. Asks & Discussion: Board input needed, intros, decision requests

Deliverable:

15-25 slide deck, presenter notes, supporting appendix with detailed financials. We can present on your behalf or coach you through presentation.

Burn Rate & Runway Forecasting

Monthly cash burn analysis, runway forecasting with scenario planning, and strategic guidance on extending runway or accelerating growth.

Key Burn Metrics:

Gross Burn:Total monthly operating expenses (OpEx)
Net Burn:Gross burn minus revenue (actual cash consumed)
Runway:Cash balance ÷ Net burn = months until $0
Burn Multiple:Net burn ÷ Net new ARR (efficiency metric)

Healthy Benchmarks:

  • • Runway: 18-24 months
  • • Burn Multiple: <1.5x
  • • Start fundraising at 12mo runway
  • • Revenue growth > burn growth

Red Flags:

  • • Runway: <12 months
  • • Burn Multiple: >2.5x
  • • Burn accelerating faster than revenue
  • • No clear path to profitability

Essential SaaS Metrics: Definitions & Calculations

MRR & ARR

Monthly Recurring Revenue (MRR):

The predictable monthly subscription revenue. Normalize annual contracts to monthly.

MRR = Σ (Monthly subscription value for all active customers)

Annual Recurring Revenue (ARR):

MRR annualized. Use for companies with primarily annual contracts or >$1M revenue.

ARR = MRR × 12

MRR Movement Breakdown:

  • New MRR: From new customers
  • Expansion MRR: Upsells/upgrades
  • Contraction MRR: Downgrades
  • Churned MRR: Cancelled customers

Churn & Retention

Logo Churn Rate:

Percentage of customers who cancel in a given period.

Logo Churn % = (Churned customers / Starting customers) × 100

Target: <5% monthly (<40% annually)

Net Revenue Retention (NRR):

Revenue retention including expansion, contraction, and churn. >100% = net expansion.

NRR % = (Starting MRR + Expansion - Contraction - Churn) / Starting MRR × 100

Target: >110% (best-in-class: >120%)

Gross Revenue Retention (GRR):

Revenue retention excluding expansion. Pure measure of stickiness.

GRR % = (Starting MRR - Contraction - Churn) / Starting MRR × 100

Target: >90%

CAC & LTV

Customer Acquisition Cost (CAC):

Fully-loaded cost to acquire a new customer (sales + marketing + allocated overhead).

CAC = (Sales & Marketing Expenses) / New Customers

Example: $100K S&M spend, 50 new customers → CAC = $2,000

Lifetime Value (LTV):

Total gross profit from a customer over their lifetime, accounting for churn.

LTV = (ARPU × Gross Margin %) / Churn Rate %

Example: $100 ARPU, 80% margin, 3% monthly churn → LTV = $2,667

LTV:CAC Ratio:

The efficiency of your business model. Higher is better.

LTV:CAC = LTV / CAC
  • • <1:1 = Unsustainable (losing money)
  • • 1:1-3:1 = Needs improvement
  • 3:1+ = Healthy SaaS business
  • • 5:1+ = Excellent, consider investing more in growth

CAC Payback Period

Definition:

Number of months to recover CAC from gross profit dollars. Critical for cash flow planning.

CAC Payback = CAC / (ARPU × Gross Margin %)

Example:
CAC = $2,000
ARPU = $100/month
Gross Margin = 80%
Monthly Gross Profit = $80
CAC Payback = $2,000 / $80 = 25 months

Healthy:

<12 months

Acceptable:

12-18 months

Concerning:

18-24 months

Problematic:

>24 months

Rule of 40: Calculation Example

High-Growth Startup (Series A)

YoY Revenue Growth:+150%
EBITDA Margin:-110%
Rule of 40:40% ✓

Burning cash but growing incredibly fast. Acceptable for early-stage raising capital.

Balanced Growth (Series B)

YoY Revenue Growth:+60%
EBITDA Margin:-10%
Rule of 40:50% ✓✓

Strong growth with improving efficiency. Ideal balance for scale-stage companies.

Profitable Growth (Late-Stage)

YoY Revenue Growth:+30%
EBITDA Margin:+25%
Rule of 40:55% ✓✓✓

Sustainable growth with strong profitability. IPO-ready metrics.

CFO CASE STUDY

How We Helped a $5M ARR SaaS Company Raise a $15M Series B

$15M
Series B raised
6 months
From engagement to close
52%
Rule of 40 achieved

The Company:

A B2B SaaS platform for sales teams. $5M ARR, 120% net revenue retention, 200+ customers, growing 10% month-over-month. Raised $8M Series A 18 months prior, now preparing for Series B.

The Challenge:

The company had strong product-market fit but lacked financial rigor. Investors in their Series A asked tough questions they couldn't answer:

  • • No cohort-based LTV:CAC analysis (couldn't prove unit economics)
  • • CAC payback was 22 months (too long for comfort)
  • • Burn rate accelerating faster than revenue (Rule of 40 = 25%)
  • • No financial model or clear path to profitability
  • • Board decks were inconsistent, missing key metrics
  • • Couldn't articulate how they'd use Series B capital efficiently

Our Approach:

  1. Financial Foundation (Month 1-2): Cleaned up books, built proper revenue recognition, implemented accrual accounting, created chart of accounts aligned with SaaS benchmarks.
  2. Metrics Dashboard (Month 2): Built automated monthly dashboard tracking MRR, ARR, churn, NRR, CAC, LTV, Rule of 40, and 15+ other key metrics. Integrated with Stripe, QuickBooks, and Salesforce.
  3. Unit Economics Deep Dive (Month 2-3): Analyzed cohorts by signup month, pricing tier, and acquisition channel. Discovered enterprise tier had 4.5:1 LTV:CAC vs. 2.2:1 for SMB. Recommended shifting focus to enterprise.
  4. Burn Optimization (Month 3-4): Identified $80K/month in wasteful spend. Reduced CAC payback from 22 → 14 months through improved sales efficiency. Improved Rule of 40 from 25% → 42%.
  5. Fundraising Model (Month 4-5): Built 5-year model with base/upside/downside cases. Showed path to $50M ARR in 4 years with 20% EBITDA margin. Clear use of proceeds and milestone plan.
  6. Board Package (Month 5-6): Created standardized monthly board deck. Practiced pitch with CEO/CFO. Prepared for investor diligence questions.

Results:

Financial Improvements:

  • • Rule of 40: 25% → 52%
  • • CAC Payback: 22mo → 14mo
  • • LTV:CAC: 2.8:1 → 4.1:1 (enterprise focus)
  • • Monthly burn: $350K → $270K
  • • NRR maintained at 120%

Fundraising Success:

  • • Raised $15M Series B (target: $12M)
  • • Led by top-tier VC, 2 strategic investors
  • • 8-week process, 3 term sheets
  • • Clean diligence, zero accounting issues
  • • 18-month runway → 30+ month runway
"SpryTax's CFO services transformed our business. They didn't just build models—they helped us understand our unit economics, optimize our burn, and tell a compelling story to investors. The financial rigor they brought was the difference between a maybe and a strong yes from VCs. $15M raised, and we're executing flawlessly against the plan they helped us build."

— CEO & Co-Founder

CFO Services Implementation Checklist

What to expect when engaging fractional CFO services for your SaaS company.

Month 1: Foundation & Discovery

Month 2: Metrics & Analysis

Month 3: Strategic Planning

Ongoing: Monthly & Quarterly Deliverables

Fundraising Support (When Needed)

Transparent Fractional CFO Pricing

Choose the engagement level that fits your stage and needs. All packages include core financial oversight and monthly metrics dashboards.

Foundation

For pre-seed and seed-stage startups

$5K/mo

Billed monthly, 3-month minimum

  • Monthly SaaS metrics dashboard
  • Financial statements review
  • Burn rate & runway tracking
  • Monthly 30-min strategy call
  • Email/Slack support
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Most Popular

Growth

For Series A/B companies scaling

$10K/mo

Billed monthly, 6-month minimum

  • Everything in Foundation, plus:
  • Quarterly board presentation decks
  • Unit economics & cohort analysis
  • Annual budget & quarterly forecasts
  • Weekly 1-hour strategy sessions
  • Board meeting participation (quarterly)
Get Started

Enterprise

For fundraising or complex needs

$15K+/mo

Custom engagement, flexible terms

  • Everything in Growth, plus:
  • Fundraising model & investor support
  • Diligence preparation & management
  • Custom financial modeling (M&A, pricing)
  • Dedicated CFO + analyst team
  • Unlimited strategic support
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