ARAI CPA Norio Arai CPA Office
ARAI CPA  /  Fractional CFO
Fractional CFO

Answering the "why" in the numbers,
and deciding the "what next" together.

Keep your existing accounting firm. On a monthly retainer, we bring finance, accounting and tax together into a single view and sit beside management as decisions are made. The work is done by a Japanese CPA and tax accountant whose strongest ground is investment modeling and valuation, with experience in listed company audit and IPO support, oversight of a major corporation's U.S. subsidiaries, and building internal control, management accounting and costing for a listed company's subsidiary.

Situations

Situations we see

Most fractional CFO engagements start the same way: the tax filings are done, but the numbers are not being used to run the business.

01

The monthly figures arrive, but nobody knows what to look at

The accounting firm sends a trial balance. It does not say which products make money, how much fixed cost the company can carry, or whether next month's cash is enough. What management needs are numbers for decisions, not numbers for filings.

What a fractional CFO doesMakes the numbers visible and separable: contribution margin by product and division, break-even, a forward view of cash. One page a month, read together in the management meeting.
02

A capital investment or new line of business needs a decision in numbers

The outlay is known. What management wants to test, in numbers rather than instinct, is the payback period and how much the company can absorb if it fails. The bank will want the same.

What a fractional CFO doesSeveral scenarios, with payback, cash impact and the worst case. A business plan built on direct costing, and the material the bank will ask for.
03

A subsidiary of a listed group is asked for parent-company standards

The parent wants internal control, management accounting, costing and monthly reporting to its standard. Nobody in the subsidiary can build it, and the tax accountant's specialty is filings.

What a fractional CFO doesBuilds the full set, internal control, management accounting, costing and monthly close, to the standard the parent expects, drawing on listed company audit and IPO experience, and acts as the contact for the parent's finance team and auditors.
04

A Japanese subsidiary of a foreign company needs a finance lead in Japan

Head office needs someone in Japan who understands both the local rules and the group's reporting, and can explain the Japanese numbers in the group's language.

What a fractional CFO doesServes as the finance lead for the Japan entity: local close and reporting in the group format, coordination with the Japanese tax accountant and auditors, and a single point of contact for head office, in English.
05

Preparing the company's finances for a succession or an exit

A succession or sale is possible in five or ten years. The company's finances should be shaped now so that its value is recognized when the time comes.

What a fractional CFO doesMeasures enterprise value and shows which levers raise it. The approach favors long-term improvement over short-term profit, and draws on practice in share valuation and Japan's business succession tax rules.
06

The CFO function is needed before a CFO can be hired

It is too early, or too hard, to hire a full-time CFO, but fundraising, bank relations and board-level financial reporting are needed now.

What a fractional CFO doesCovers the CFO function until a full-time hire, then helps define the role and hand it over.
Finance, accounting and tax, applied together to a manager's problem. Make the numbers visible, take them apart, and give the best answer to "why" and "what next". That is what we mean by serving as the management's chief of staff for finance.From the office's mission statement
What we do

What we do

We do not split finance, accounting and tax. A management question gets one answer. Bookkeeping and filings stay with your existing firm; we concentrate on the material for decisions and on being the person management talks to before deciding.

Monthly management meetings

The month's numbers on one page, read with management. The "why" explained with numbers and facts, the "what next" set out as the next move.

Management accounting and costing

Contribution margin by product and division, break-even, profit per unit of constraint. Numbers for decisions, not fully-allocated cost.

Investment modeling (our strongest area)

DCF, economic profit, ROIC decomposition, scenario and sensitivity analysis, Monte Carlo: the full toolkit of McKinsey's Valuation, applied to capital investment, new business, M&A and exit decisions. Payback and worst-case cash impact, written into a plan the bank or parent company can follow.

Banks, parent companies and shareholders

The substance behind the financial statements, delivered first and in writing. We join meetings with lenders and coordinate with the parent's finance team and auditors.

Internal control and monthly close

Listed-group standards scaled to the company: faster close, approval workflow, fraud prevention.

Group and overseas subsidiary oversight

One view across domestic and overseas entities, linking local accounting firms with the Japanese parent or head office.

FAQ

Common questions

Do we have to change our accounting firm?
No. Bookkeeping and tax filings stay with your current firm. We concentrate on the numbers for decisions and on advising management. The division of roles is put in writing at the start, and we work with your firm as needed.
How often are you involved?
The standard is one management meeting a month, prepared by a monthly analysis. In periods that need concentrated work, such as an investment decision or a parent-company review, the frequency increases.
How does this compare with hiring a CFO?
A full-time CFO in Japan costs several hundred thousand dollars a year and is hard to find. A fractional CFO is a fixed monthly fee for the scope you need, and we help define and hand over the role when a full-time hire makes sense.
Is the fractional CFO responsible for cash flow outcomes?
The fractional CFO advises; decisions and responsibility remain with management. Our responsibility is to present the numbers and the options accurately and in full.
Which companies are a good fit?
Companies with revenue from a few million to around $150 million that have a tax accountant but no finance counterpart; subsidiaries of listed groups asked for parent-company standards; Japan entities of foreign companies; companies with overseas subsidiaries; and owners preparing for a succession or exit.
How are fees set?
A fixed monthly fee, based on frequency and scope. We confirm the situation in the first consultation and quote in writing.
Related

Related writing and talks

  • Lecture, September 2026, Fukushima SME AssociationUsing Accounting for Decision-making
  • Zeimu Koho, October 2026The Residual Income Model in Share Valuation: Practical Implications of the Expert Panel's Findings
Contact

The first hour
is free.

We organize your situation, identify the issues, and tell you plainly whether we can help. We reply within two business days.

  • Emailinfo@araicpas.com
  • Tokyo5-5-17-303 Kugayama, Suginami-ku, Tokyo 168-0082, Japan
  • KoriyamaCorpo Bldg. 301, 1-5-1 Tsurumidan, Koriyama, Fukushima 963-8861, Japan
  • MeetingsIn person / Online (Zoom, Teams), scheduled around U.S. time zones

← Back to home