Delivered by our partner, Infinite Five

A senior finance leader for your business — part-time, fixed fee.

Brimston & Co. builds and structures businesses. Accounting, bookkeeping, tax, and fractional CFO advisory are handled by our partner firm, Infinite Five Accounting & Advisory — so the numbers stay with a dedicated accounting practice while we handle the foundation.

What is a fractional CFO?

Strategic financial leadership without a full-time executive.

A fractional CFO serves your business part-time — typically a few days per month — and owns the questions a bookkeeper can't answer. Where should we spend the next dollar? Can we afford this hire? How much runway do we have? What does the lender need to see?

If that's what you need, we'll introduce you to Infinite Five directly. If you're still forming or restructuring the business itself, that part stays with us.

Capabilities

What a fractional CFO delivers.

Forecasting & Budgeting

Rolling 13-week cash forecasts, annual operating budgets, and scenario planning for the decisions that matter.

KPIs & Board Reporting

The five numbers your business actually runs on, packaged into a monthly board deck investors can trust.

Fundraising & Debt

Investor-ready models, data rooms, and lender packages — plus a seasoned voice in the room during diligence.

Operational Finance

Pricing, unit economics, margin analysis, and hiring plans grounded in the numbers, not the vibes.

When to hire

Six signals it's time.

Most SMBs bring in a fractional CFO between $1M and $30M in revenue — when a bookkeeper isn't enough, but a full-time CFO isn't justified yet.

  • Revenue between $1M and $30M
  • Raising capital or refinancing debt
  • Multi-entity or multi-state structure
  • Preparing for an acquisition or exit
  • Bookkeeper in place, but no financial strategy
  • Founder still owns the model in a spreadsheet

Our accounting partner

Infinite Five Accounting & Advisory

Bookkeeping, cleanup, tax preparation, controller support, and fractional CFO advisory — all in one accounting practice. Tell us what you need and we'll make the introduction, or reach out to them directly.