Fractional CFO | Denver, Colorado

Strategic Financial Leadership, Right-Sized for Your Business

Senior finance experience for small business owners and real estate investors, without the full-time hire. We build the cash flow forecasts, reporting, and models that show you what is actually happening and what to do next.

No pressure and no sales pitch. Just a conversation about your numbers.

Reviewing financial dashboards with small business clients

20+ years

In commercial real estate finance: lending, asset management, and private equity

Former CFO

Led the finance function for a Colorado university

UChicago

Economics degree from the University of Chicago

10+ years

As a hands-on residential real estate investor

What we do

Sharper numbers, stronger decisions.

Pick the level of help that fits. Some clients want an ongoing finance partner. Others need one model built right.

Fractional CFO reviewing reports with a business owner

Fractional CFO

Senior-level strategy and oversight without a full-time salary. Cash flow forecasting, budgets, board-ready reporting, and a second set of eyes on the big decisions.

Fractional CFO services

Financial forecast spreadsheet on a desk

Custom Spreadsheets and Dashboards

Models and dashboards built around how your business actually runs, so updating your numbers takes minutes instead of hours.

Spreadsheet consulting

Financial dashboard on a desktop computer

AI Integration and Training

Practical automation for reporting and back-office work, plus the training your team needs to keep it running without us.

AI integration and training

Business owner planning finances

On-Demand Workshops

Mastering Your Business Finances and From Controller to CFO, recorded and ready to watch on your schedule, each with the slide deck and an Excel toolkit.

See the workshops

Who we help

Two kinds of clients, one standard of rigor.

Small business owners

You are profitable on paper, but cash still feels tight. You want to know whether you can afford to hire, raise prices, or expand before you commit, not after.

  • Cash flow forecasts you can plan around
  • Monthly reporting a non-numbers person can read
  • Pricing, hiring, and budget decisions backed by real math

6 signs your business needs a fractional CFO

Real estate investors

You want to know whether a deal pencils before you make an offer, and how your portfolio is really performing once every expense is counted.

  • Deal analysis: cap rate, cash-on-cash, and cash flow
  • Portfolio tracking and landlord budgeting
  • One-on-one coaching from an active investor

Try the free calculators | Investor coaching

From the blog

Latest articles

Client stories

What clients say

“Erin took a complex reporting process that used to eat up hours of my time and built a spreadsheet that now takes mere minutes to update. What used to be one of the most tedious parts of my week is now practically effortless. She understood exactly what I needed and delivered a solution that just works.”

Mark Dally, Founder, Asset Accountant

“Simply Spreadsheets transformed how we manage our finances at GC Counsel. Erin took our budgeting and cash flow processes and turned them into clear, organized systems that actually make sense. She’s responsive, reasonable, and has a real gift for making complex financial data digestible for non-numbers people.”

Joe Whitehead, Esq., Owner, GC Counsel

Erin Onsager, founder of Simply Spreadsheets

“Numbers tell stories. We help you read them. With 20+ years in senior finance, from owner-operated small businesses to institutional real estate, we bring the same hands-on rigor whether you run a restaurant or a rental portfolio.”

Erin Onsager, Founder

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