Glossary
What Does a Controller Do?
A controller owns the accuracy of a company’s financial reporting. They close the books each month, produce the financial statements, maintain the reconciliations and controls behind them, and forecast cash. The simplest framing: a bookkeeper gets the information in, a controller turns it into reporting you can actually run the business on, and a CFO decides what to do with it.
Titles in this area are used loosely, which is the main reason companies end up with something other than what they expected. Financial controller, controller and comptroller usually describe the same function. Whether a given role is really controllership or really bookkeeping depends on the work, not the title.
What a controller does day to day
The month-end close is the core of it, and it follows a recognisable rhythm. This is how the process runs across the companies our own controllership team supports.
- The close kicks off on the first of the month. Not whenever there is time, which is the single most common failure of an unmanaged close.
- Transactions get categorised. Every bank and credit card transaction from the prior month is coded.
- Unknowns go back to the business. Anything that cannot be identified is collected into one list and sent to the owner or manager to explain, rather than guessed at.
- Accounts are reconciled once the statements close, bank and credit cards both. See the bank reconciliation process.
- The balance sheet and profit and loss get reviewed month by month, looking for anything that does not line up structurally against prior periods.
- A reporting package is issued, covering cash flow, the balance sheet and the profit and loss.
Around that sit the things that are not monthly but are still the controller’s: the accounting policies, the controls, who has access to what, cash flow forecasting, and the governance conversations with ownership about what the numbers mean.
The monthly versus annual difference
This is the part worth understanding if you are deciding whether you need one, and it is rarely explained.
In a business with bookkeeping but no controller, the adjusting journal entries that make the financials correct often only happen once a year, when the external accountant comes in to prepare the year-end. Everything in between is uncorrected. The monthly numbers you have been running the business on all year were never quite right, and you find out in month fourteen.
A controller makes those entries monthly. The reporting is usable when you get it rather than retrospectively. For a business making decisions off its own numbers, that difference matters more than any org chart question.
Controller, bookkeeper, CFO
| Bookkeeper | Controller | CFO | |
|---|---|---|---|
| Core question | Is it recorded correctly? | Is it right, and what does it say? | Where are we going? |
| Typical work | Categorising transactions, AP, AR, bank and card reconciliations | Month-end close, financial statements, reconciling review, controls, cash flow forecasting | Capital structure, fundraising, strategy, board and investor relations |
| Output | Clean underlying data | A monthly reporting package you can act on | Direction and capital decisions |
| Seniority | Foundational | Senior, owns the reporting | Executive |
A useful way to think about the controller specifically is as the accounting manager of the business: the person responsible for the financial statements, the forecasting and the governance, looking at the company as a whole rather than at individual transactions.
Controller versus comptroller is almost entirely a naming convention rather than a difference in the work, with comptroller more common in government and non-profits. Comptroller versus controller covers it.
Is a controller more senior than an accountant or a CPA?
In scope, yes. A controller sits above the accounting and bookkeeping function and is accountable for its output. That is a question of responsibility rather than of worth, and most businesses need both functions performed regardless of how many people perform them.
A CPA designation is not strictly required to hold the title, and it is common, because the role carries responsibility for the integrity of reported numbers. What matters more in practice is whether the person actually works in the ledger. In our experience a controller who only reviews, and never touches the accounts, tends not to catch much.
Common misconceptions
“A controller is just an expensive bookkeeper.”
They answer different questions. We routinely see businesses whose books are accurate and who still cannot tell where cash is going or whether a month was genuinely good. That is bookkeeping without controllership.
“We have a CFO, so we do not need a controller.”
These are complementary, and the gap is common in smaller companies. A CFO without a controller frequently ends up doing the close personally, which is an expensive way to reconcile a bank account.
“It is a full-time role.”
Below a certain size it usually is not, which is why fractional arrangements exist. The work is real but it does not require a permanent salaried hire at every scale.
“They are a finance person.”
The good ones are accounting-heavy rather than finance-heavy. The role lives in general ledgers and accounting systems, not in models and decks.
How we approach controllership
Treewalk runs this as a dedicated team of CPAs who do nothing else. They are deliberately hands-on: they make the journal entries monthly rather than only reviewing someone else’s, and they work inside your accounting system rather than at a distance from it.
Capacity is kept deliberately low per person, because the role does not work at volume. Because the same team works across many companies, the tooling tends to be better than a single in-house hire would build, including automation across accounts payable and receivable.
We have no audit or tax practice attached to this work. Treewalk does not provide audit or attest services, and for tax we work alongside a specialist. That means the people running your close are not being pulled onto an audit in busy season.
This is frequently the right answer for businesses that have recently been acquired, are coming off a transition services agreement, or have outgrown bookkeeping without needing a full-time hire. See outsourced controller services for how that engagement works.
Frequently asked questions
What is the difference between a controller and a CFO?
A controller is accountable for the accuracy of the reporting. A CFO is accountable for the decisions made with it, plus capital structure, financing and strategy. A company can need both, one, or neither depending on size and complexity.
Do we need a controller if we already have a bookkeeper?
Often yes, and they are complementary rather than alternatives. Businesses that have only ever had a bookkeeper commonly have accurate data and no usable reporting, and no one making the monthly adjusting entries that would make the financials correct as you go.
Is a controller the same as a financial controller or a comptroller?
Generally yes. The terms describe the same function, with comptroller more common in government and non-profit settings.
Do you need to be a CPA to be a controller?
Not strictly, and many are. The designation signals the technical accounting depth the role demands, but practical experience owning a close matters just as much.
How much do controllers get paid?
It varies widely by region, company size and whether the role includes staff management, so any single figure would be misleading. The more useful comparison for a smaller business is the total cost of a permanent hire, including benefits and payroll burden, against a fractional arrangement.
Can a controller take on a business whose books are behind?
Yes, and cleanup work is a common starting point. Where the books are in poor shape, hands-on controllership is usually what is needed in the short term rather than high-level oversight, precisely because someone has to get into the ledger and fix it.
How long does it take to bring a fractional controller in?
The usual pattern is running alongside the existing arrangement while the close is stabilised, then taking on more as the process proves out. It is a transition rather than a switch.
Where to next
If you can get accurate numbers but not useful ones, or your financials are only really correct once a year when your accountant fixes them, that is a controllership gap rather than a bookkeeping one. Our private company team runs this function for businesses that need it without needing it full time. Read outsourced controller services for how the engagement works, and the month-end close process for what a disciplined close should look like. To talk through your situation, email Avnit Sekhon at avnit.sekhon@treewalk.com.
