What a fractional CFO does for an ecommerce business
An online store can grow revenue by 80 percent and still run out of cash. Inventory is paid for months before it sells, ad spend is paid today and returns arrive later, and marketplaces hold back payouts. A bookkeeper records all of this correctly and still cannot tell you whether the business is making money on each order. That gap is the job of a fractional CFO.
The work usually covers six areas:
- Contribution margin by channel and SKU. Revenue minus product cost, shipping, payment fees, returns, and ad spend, so you know which products and channels deserve more budget.
- Inventory cash planning. A purchase and cash forecast that shows how much stock you can afford to order, and when cash gets tight before a peak season.
- Financing. Preparing the package for an inventory loan, a line of credit, or revenue based financing, and negotiating terms with a clear picture of your borrowing base.
- Sales tax and multi-state exposure. A review of economic nexus by state, coordination with your tax preparer, and a plan to register before a notice arrives.
- Accounting quality. Clean revenue recognition across Shopify, Amazon, and wholesale, payout reconciliation, and a monthly close that finishes in days.
- Exit and investor readiness. Normalized earnings, a data room, and the metrics a buyer or investor will ask for.
The CFO does not replace your bookkeeper or file your taxes. They turn the books into decisions about what to buy, what to promote, and how to fund growth.
Signs your online store needs a fractional CFO
Owners usually look for one when the numbers stop answering their questions. These are the situations leaders describe most often.
- Revenue is growing but the bank balance is not, and nobody can say why.
- You are placing inventory orders based on gut feel and last year sales.
- You are doing $2M to $50M a year and the books are reviewed once a quarter, if at all.
- A lender, investor, or acquirer has asked for financials you cannot yet produce.
- You sell in many states and have never reviewed sales tax registration.
- Gross margin looks healthy, but returns, shipping, and ad spend eat most of it.
If you only need monthly books and a tax filing, a fractional controller costs less and fits better. Brands in earlier stages can start with the broader fractional CFO for small business page.
How much does a fractional CFO for ecommerce cost
Experienced fractional CFOs on Side.work charge $175 to $300 an hour. Monthly cost equals hourly rate times hours a week times 4.33, rounded to the nearest dollar. The $225 column is a planning example in the middle of the band.
| Hours a week | At $175 an hour | At $225 an hour | At $300 an hour |
|---|---|---|---|
| 5 | $3,789 | $4,871 | $6,495 |
| 8 | $6,062 | $7,794 | $10,392 |
| 10 | $7,578 | $9,743 | $12,990 |
| 12 | $9,093 | $11,691 | $15,588 |
The platform fee of 12, 8, or 5 percent and the plan subscription are added on top. Invoices follow approved hours, so a quiet month costs less. Many brands run 10 to 12 hours a week during a financing or a peak season and drop to 5 to 6 afterward. The full breakdown is in the fractional CFO cost guide.
Fractional CFO vs controller vs an ecommerce accounting firm
Each option solves a different problem, and many brands end up with two of them.
| Option | Typical cost | Best for | Watch out for |
|---|---|---|---|
| Fractional CFO | $3,800 to $15,600 a month at 5 to 12 hours a week | Margin analysis, cash forecast, financing, board or lender reporting | Needs a bookkeeper or controller to keep the books current |
| Fractional controller | Lower hourly rate, 4 to 10 hours a week | Clean monthly close, reconciliations, audit and tax prep | Less strategy, no financing work |
| Ecommerce bookkeeping or accounting firm | Fixed monthly package | Books and tax filing at a predictable fee | Reporting is backward looking and advice is limited |
| Full time CFO | Salary, bonus, equity, and benefits, typically a large six figure package | Brands above roughly $75M with complex operations | Cost and hiring time before the need is proven |
A common setup is an accounting firm or controller for the books and a fractional CFO for the decisions.
A typical week, Fractional CFO
10 hours a week
- Hourly rate
- $175 to $300
- Monthly cost
- $7,600 to $13,000
What the first 90 days look like
Month one finds out where the money goes
The CFO reviews the chart of accounts, channel reports, payout reconciliations, inventory records, and open liabilities. By the end of the month you have a contribution margin report by channel and the three or four findings that matter most, such as a product line that loses money after returns.
Month two builds the forecast
The CFO builds a 13 week cash forecast and a purchase plan tied to sell-through. If you need financing, the lender package is drafted now, while there is time to fix gaps.
Month three sets the rhythm
You get a monthly report with margin, cash, inventory turns, and a short list of actions. Sales tax gaps have an owner, and the next peak season has a funding plan.
How hiring a fractional CFO works on Side.work
Choose the fractional CFO role, enter weekly hours and budget, and describe your channels, revenue range, and the decision you need help with. Side.work ranks verified profiles by fit and shows live availability. You can open conversations with several candidates, compare how each would approach your first 90 days, and sign a contract with a weekly hours cap. One invoice covers all hours.
Questions to ask a fractional CFO before you hire
- Which ecommerce brands have you worked with, and what were their channels and revenue ranges?
- How do you calculate contribution margin when returns and ad spend arrive on different dates?
- Tell me about an inventory financing you arranged and what the lender asked for.
- How would you review our sales tax exposure, and who do you work with on the filing?
- What would you look at in the first two weeks, and what access do you need?
- How many hours do you expect each month, and how do you report them?