Glossary
Outsourced Controller Services
An outsourced controller runs the accounting function of a business without being an employee of it. The work is the monthly close, the financial statements, cash flow forecasting and the governance around both. At Treewalk a dedicated team of CPAs does nothing else, acting as the back-end accounting manager for companies that need that capability but do not need it full time.
The definitions are genuinely unsettled
It is worth saying plainly: everyone’s definition of a fractional controller is different. Some firms use the term for what is really bookkeeping. Others use it interchangeably with fractional CFO. That ambiguity is the main reason buyers of this service end up with something other than what they expected.
Here is how we draw the lines.
| Bookkeeper | Controller | CFO | |
|---|---|---|---|
| Core job | Get the information in accurately | Turn it into reporting you can run the business on | Decide what to do with the business |
| Typical work | Journal entries, AP, AR, bank reconciliations | Month-end close, financial statements, cash flow forecasting, governance | Capital structure, fundraising, strategy, board |
| Question answered | Is it recorded correctly? | Is it right, and what does it say? | Where are we going? |
| Replaces | A bookkeeper | An accounting manager | A CFO |
The most useful way to think about fractional controllership is as replacing an accounting manager: somebody who produces the financial statements, does the cash flow forecasting, handles governance with you, and looks at the business as a whole.
Hands in the ledger, not just oversight
A common and reasonable fear is paying for a senior person who reviews but does not do, leaving you still needing someone to perform the work.
That is not how our team operates. They make the journal entries monthly rather than only reviewing them, and the output is a package at the end of each month showing what is happening with cash flow, the balance sheet and the profit and loss. The depth is the point. A reviewer who never touches the ledger cannot tell you much about it.
Because the same team works across a number of companies, the tooling tends to be better than a single in-house hire would build. We run automation on accounts payable and receivable across our client base, which is not something most businesses of this size would implement alone.
Capacity is deliberately limited. A fractional controller carries only a small number of clients at once, depending on how intensive each one is, because the role does not work at volume.
The most common trigger is an acquisition
The single most frequent reason a business needs this is that somebody just bought it.
An acquirer inherits a finance function built for the previous owner, often with more seniority than the business actually requires, or with key knowledge sitting in the head of someone who is leaving. Over the past year several of our diligence clients restructured after closing, released full-time roles that were not needed at that scale, and moved to fractional controllership and bookkeeping instead.
The economics are straightforward. A business of modest size frequently does not need a full-time person once you account for benefits, payroll and everything else that attaches to a permanent hire, and a fractional arrangement is generally the lighter option.
Where we have run the quality of earnings beforehand, we come into that conversation already knowing the business. We have seen how big it is, where the risks sit, how many people are in the accounting function and where the holes are. That means the recommendation can be specific rather than generic.
How we assess which level you need
Not everyone needs a controller. Recommending one to a business that needs a bookkeeper is a way to sell more work, not a way to solve the problem.
Bookkeeping is probably enough if the business is single-entity, domestic, and reasonably simple, and you have enough financial background to read the package yourself. The priority then is getting information in accurately and producing a clean monthly package.
Controllership tends to be warranted from day one if any of these are true:
- Multiple entities
- Manufacturing or inventory-heavy operations
- Cross-border activity
- Sales tax exposure across jurisdictions
- A carve-out with a transition services agreement you want to exit quickly
- No one internally who can interpret the numbers
A reasonable middle position is to start at the bookkeeping level and revisit if the business grows materially. We have made exactly that recommendation to clients who did not need more at the time.
Carve-outs and post-close transitions
Where a business is being separated from a parent, the accounting function usually has to be stood up quickly while a transition services agreement is running and expensive. We are often brought in to backfill that function while the finance and accounting team is restructured, with the aim of coming off the parent’s services as fast as is practical.
The specific advice we give acquirers on the books themselves is consistent: start your own set from day one rather than inheriting and continuing the seller’s, because carrying forward someone else’s errors creates more work than it saves. Run yours in parallel for a period, close theirs out, and move everything onto a cloud accounting system so access is not a bottleneck. See QuickBooks Online versus desktop for why the platform choice matters more than it looks.
Then set a firm monthly closing date and hold it. If the seller’s finance lead is staying for a transition period, that window is the single best opportunity to transfer what they know, and it closes quickly.
One engagement of this shape replaced an accounting manager, a senior finance leader and a CFO with our team acting as assistant controller with oversight, including the statutory reporting obligations of a European subsidiary. The function got smaller and the reporting did not suffer.
What we do not do
We have no audit or tax practice outside of the advisory work described here. Treewalk does not provide audit or attest services, and we are not your auditor. For tax we work alongside a specialist rather than taking it on.
That is a genuine constraint and also the reason the model works: the consulting and advisory side is the main business rather than a sideline to an audit practice, so the people doing your close are not being pulled onto something else in busy season.
Frequently asked questions
What does an outsourced controller actually do each month?
Closes the books to a set date, prepares the financial statements, reviews and makes the journal entries, maintains the reconciliations, produces a reporting package covering cash flow, balance sheet and profit and loss, and raises what needs attention. Forecasting and governance sit alongside that.
How is this different from hiring one fractional controller directly?
An individual is a single point of failure: they can be unavailable, leave, or simply not have seen your particular situation before. A firm brings a team, a documented process and a backstop, and the work continues when any one person does not.
Do we still need this if we already have a bookkeeper?
Often yes, and the two are complementary rather than alternatives. A bookkeeper records; a controller reviews, reports and forecasts. Businesses that have only ever had a bookkeeper frequently have accurate data and no usable reporting.
We just acquired a business. Should we set this up before or after closing?
Decide before, implement immediately after. The first month after close is when the seller’s staff are still reachable and the knowledge is still recoverable, and it is also when it is easiest to start your own books cleanly rather than inheriting.
Is a controller more senior than a bookkeeper?
Yes, in scope rather than in worth. The roles answer different questions and a business of any size usually needs both functions performed, whether by one person or several. Comptroller versus controller covers the terminology.
Can you take over from our existing team gradually?
That is the usual pattern. We commonly run alongside an existing arrangement while the close is stabilised, then take on more as the process proves out.
Where to next
If you have recently acquired a business, are coming off a transition services agreement, or have outgrown bookkeeping without needing a full-time controller, the practical first question is which level you actually need rather than how quickly you can hire. Our private company team runs this for businesses across that range. Read fractional controller for the narrower role, and the month-end close process for what a disciplined close looks like. To talk through your situation, email Avnit Sekhon at avnit.sekhon@treewalk.com.