Most Series A and B startups pay between $5,000 and $20,000 per month for fractional CFO services in 2026. The range is wide because the work is — a $5K engagement and a $20K engagement are doing very different jobs for very different companies. This post walks through what each tier actually delivers, what changes the price, and what is explicitly not part of a fractional CFO retainer at any level.
The three pricing tiers
Fractional CFO retainers cluster into three bands. The bands aren’t arbitrary — they correspond to how much active time the CFO spends embedded in your operations.
$5,000/month — Light operating CFO. This is the entry-level retainer most Series A startups need when they first realize their bookkeeper can’t build a board package. At this tier, you get:
- A monthly board reporting package built on top of your existing books
- KPI dashboards and variance commentary
- A working operating model (light scenario planning, not investor-grade)
- One or two strategic check-ins per month
- Availability for one-off questions via email or Slack
What you don’t get at this tier is active fundraise support, in-person board attendance, or daily operational involvement. The retainer assumes you have a controller or accounting partner closing the books on time, and that your business model isn’t in flux.
$7,500–$10,000/month — Active operating CFO. This is the tier most Series A companies move to within six months of starting an engagement, and the default tier for Series B companies not actively raising. At this band, the CFO is:
- Building and maintaining a defensible bottoms-up operating model
- Running scenario planning across multiple raise sizes, hiring plans, and burn profiles
- Joining board meetings as a finance presence and presenting the package directly
- Sitting in on strategic calls — pricing changes, hiring decisions, M&A consideration
- Supporting active fundraise prep: data room, investor diligence, model defenses
Most engagements that include active fundraising activity land somewhere between $7,500 and $10,000 per month. If your board cadence is monthly rather than quarterly, you’re at the upper end of this band.
$15,000–$20,000/month — Deep operator / interim CFO. This tier is reserved for companies with one of three profiles: a Series B+ company without a full-time CFO and not yet ready to hire one, a company actively in a Series B or C process with weekly investor touchpoints, or a company in the middle of a complex operational event (acquisition, restructuring, founder transition).
At this tier, the CFO is functionally embedded — multiple touchpoints per week with the founder, weekly leadership presence, direct involvement in pricing decisions, hiring panels, and investor calls. This is interim CFO work, billed by retainer.
What changes the price
Four variables move pricing within the tiers above. None of them are negotiable mysteries — they’re operational realities.
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Board cadence. A company with quarterly board meetings runs a different cadence than one with monthly meetings. Monthly board packages, especially with formal pre-reads and post-meeting follow-ups, add real time. Expect to be in the upper third of whichever tier you’re in if your board meets monthly.
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Fundraise activity. Active raises pull the CFO into investor calls, diligence Q&A, and constant model updates. A retainer that covers “fundraise support” for a 6-month process is structurally different from one that covers occasional model tweaks. Most firms either charge a different retainer rate during raise windows or scope raise support as a separate engagement with its own fee.
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Team and entity complexity. A 30-person, single-entity US-only company is a different operation than an 80-person, multi-entity, multi-state company with international contractors. The latter generates more board questions, more reporting requirements, and more operational decisions that route through finance.
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Reporting complexity. SaaS metrics, R&D capitalization, multi-product revenue recognition, deferred revenue at scale — these add hours every month. A company with a single product line and simple revenue recognition is a lower-touch engagement than one running enterprise contracts with custom terms.
What’s NOT included at any tier
This is where most founders get tripped up in scoping conversations. A fractional CFO retainer at any price is not:
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Bookkeeping or transactional accounting. Closing the books, processing AP, running payroll, reconciling bank accounts — none of these are CFO work. If you don’t have a bookkeeper or accounting partner doing this work, your fractional CFO will spend half their retainer cleaning up bad data instead of doing strategic work. Most CFO firms (including Pegacorn) will either decline the engagement or insist on adding an accounting retainer alongside.
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A full-time CFO. A fractional CFO is 1–4 days per month of deeply skilled time. A full-time CFO is 22 working days per month, plus availability for ad-hoc decisions and operational emergencies. Past a certain operational complexity, you need the full-time version. The fractional model is a bridge — typically two to three years — not a destination for a mature company.
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A magic fix for bad financial data. A CFO can identify the gaps and structure the cleanup, but the cleanup itself is bookkeeping work. Companies that come to a fractional CFO expecting their financials to suddenly become reliable without doing the underlying accounting work get disappointed quickly.
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A guaranteed close on a fundraise. A CFO can build a great model and defend it well. They can prepare the data room and run diligence cleanly. They cannot force investors to believe in your market or your team. Fundraise outcomes are a function of the business, not the finance package.
What a Pegacorn engagement actually looks like
Pegacorn fractional CFO retainers start at $5,000/month. Most Series A and B clients engage in the $5,000–$10,000 range, with the specific number determined by board cadence, fundraise activity, and reporting complexity. We do not have setup fees or long-term contracts — every engagement is month-to-month, and we’d rather scope down to what you actually need than oversell.
If you’re trying to figure out where your company sits in the tiers above, tell us what you need and we’ll scope an engagement that fits.