Bookkeeping · Close · Tax Small businesses, startups & ecommerce Updated September 2026

Excello Services

“Excelled People For Excellent Services”

Ecommerce CFO services that show which sales are worth making.

Excello's ecommerce CFO services give online stores and brands part-time senior finance help: profit per order after ad spend, margin by product and channel, a rolling cash forecast and a budget, all built on books closed monthly.

Sales tell you what customers bought. A CFO tells you which of those sales paid, working from the books inside your own QuickBooks, Xero or Odoo.

A telescope on a tripod pointed at a star An ink drawing of a brass-style telescope on a three-legged stand, aimed at a single star in the corner.


What is an ecommerce CFO?

Looking ahead

An ecommerce CFO is a senior finance professional who plans an online store's numbers forward: which products and channels make money, what an order earns after ads, and how much cash the next months need.

A bookkeeper records what happened and closes the month. CFO services for ecommerce start from those closed books and turn them into decisions about prices, ad budgets and spending.

Most growing stores don't need that full-time. A fractional CFO for ecommerce does the same work part-time, which is how Excello provides it.

Profit per order, after ad spend

Contribution margin

Contribution margin is what an order leaves after the costs that come with it. Measured after ad spend, it is the clearest test of whether growth is paying.

One order, from price to profit (illustrative)
LinePer order
Average order value$60.00
Landed cost of the goods($21.00)
Fulfillment and shipping($8.00)
Payment and marketplace fees($3.00)
Contribution before ads$28.00
Ad spend per order($18.00)
Contribution after ads$10.00

Break-even ROAS is the return on ad spend at which an order neither makes nor loses money: the price divided by the contribution before ads.

Break-even ROAS = $60 ÷ $28 = 2.14

Here, ads bring back $3.33 in sales for every dollar spent, above the 2.14 break-even, so each order still leaves $10. A campaign running below 2.14 loses money on every order it wins, however good the sales look.

Try your own numbers in the break-even calculator.

Pricing and margin by product

Which products pay

The product that sells most is not always the one that earns most. Once ad spend is shared out by product, the picture often changes.

Profit per order by product, after ad spend (illustrative)
ProductPriceLanded costFulfillment and feesAds per orderLeft per order
Bestseller, most units sold$45($18)($10)($15)$2
Mid-range product$60($20)($11)($9)$20
Low-price add-on$30($9)($8)($14)($1)

In this example the bestseller leaves $2 an order, the mid-range product $20, and the add-on loses $1. The decisions follow: a price change, less ad spend on the add-on, or selling it only as part of a bundle. The same view works channel by channel.

Ecommerce cash flow and the financial model

The months ahead

Why ecommerce cash flow is tight

Stock is paid for weeks or months before it sells. Ad platforms charge as you go. Marketplaces hold part of your money before they pay it out. A store can be profitable and still run short of cash.

A rolling cash forecast puts the payouts on the way, the stock orders you have planned and your ad budget in one view, so a short month shows up while there is still time to act.

An ecommerce financial model

The model links price, landed cost, fees, ad spend and payout timing to profit and cash, then tests the cases you are weighing: a price rise, a bigger season, a new channel or a new hire.

Starting on your own? The free cash flow forecast template and financial model template are good first versions.

What Excello's ecommerce CFO services include

Full scope

Take the parts you need. Each is built on books closed monthly, whether Excello keeps them or your current bookkeeper does.

Ecommerce CFO services scope
WorkWhat you get
Profit per order after ad spendBy channel, with the break-even ROAS for each
Pricing and margin by productWhich products and channels earn, and where prices should move
Rolling cash forecastPayouts on the way, planned stock orders and ad budgets in one view
Financial model and scenariosA model built on your ledger, with the cases you want to test
Budget against actualEvery month, from the closed books
Unit economicsWhat a customer and an order are worth, channel by channel
Hiring and capital planningWhat the business can afford, and when
Working capitalCash tied up in stock and in marketplace balances

How the CFO service works for any business, and how to choose a provider, is on the fractional CFO page.

When an online store needs CFO services

The signs

  • Sales are growing, but the bank balance is not.
  • Ad spend is rising faster than profit.
  • You sell on several channels and can't say which one pays.
  • A bestseller might be losing money once ads are counted.
  • A big season, a price change or a new hire needs a decision now.
The question is never how much you sold. It is how much of it you kept.

What ecommerce CFO services cost

Pricing

Excello quotes CFO work before it starts, based on which parts of the scope you want, how complex the business is and the state of your books.

CFO work can be taken on its own or alongside bookkeeping, which starts from $150 a month on the bookkeeping plans.

Frequently asked questions

What does an ecommerce CFO do?

An ecommerce CFO plans an online store's numbers forward. That means working out what each order earns after ads, which products and channels make money, where prices should move, and how much cash the coming months need, all from closed, reconciled books.

What is contribution margin in ecommerce?

Contribution margin is what an order leaves after the costs that come with it: the landed cost of the goods, fulfillment, shipping and fees. Measured before and after ad spend, it shows whether growth is making money or only making sales.

How do you work out profit per order?

Start with the order value and take off the landed cost of the goods, fulfillment, shipping and fees, then the ad spend behind the order. In the example on this page, a $60 order leaves $28 before ads and $10 after them.

When does an online store need a fractional CFO?

Usually when sales grow but cash does not, when ad spend rises faster than profit, or when several channels make it unclear which one pays. A fractional CFO for ecommerce answers those questions part-time, without the cost of a full-time hire.

Can I use Excello as my ecommerce CFO and keep my bookkeeper?

Yes. CFO work can be taken on its own. The analysis is only as good as the books under it, so your ledger is reviewed first, and anything behind can be fixed by your bookkeeper or with Excello's catch-up work.

How much do ecommerce CFO services cost?

Excello quotes CFO work before it starts. The quote depends on which parts of the scope you want, how complex the business is and the state of your books. Bookkeeping, if you want it too, starts from the plans on the pricing page.

Book a call

Tell us where you sell, what you spend on ads each month and the decision you are weighing. We'll come back within one business day with a time for a call.

  • Profit per order and break-even ROAS
  • Pricing and margin by product
  • Built on books in your own QuickBooks, Xero or Odoo

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