A fractional executive with four clients should expect a small stack of tax forms every January, one from each company that paid enough during the year. Here is what arrives, what might not, and why your own books matter more than any of it.
The 1099-NEC from each client over $600
When a business pays an independent contractor $600 or more in a calendar year for services, it must file a 1099-NEC reporting the total and send you a copy by January 31. Fractional CFO, CMO, and COO retainers squarely count as nonemployee compensation, so each client relationship above the threshold generates its own form. Early in an engagement your client's finance team will usually send you a Form W-9 to collect your legal name, entity type, and taxpayer identification number; fill it out promptly, because a missing W-9 can trigger backup withholding on your invoices.
One wrinkle matters for incorporated practices: payments to corporations, including an LLC taxed as an S corp, are generally exempt from 1099-NEC reporting. So the year you elect S corp status, some clients will correctly stop sending you the form. Your income did not become invisible to the IRS, it simply gets reported through your corporate return instead.
Payments through processors and the 1099-K question
If a client pays your invoices by credit card or through certain payment platforms, the reporting duty shifts to the payment processor, which issues a 1099-K instead. The 1099-K dollar threshold has moved around in recent years as Congress and the IRS have adjusted the rules, so check current IRS guidance rather than relying on an old number. The practical risk is double counting: if a client sends a 1099-NEC for an invoice that a processor also captured on a 1099-K, naive bookkeeping can make your income look larger than it was. Reconcile the forms against your actual deposits before filing.
Your books, not the forms, are the record
Every dollar of fractional income is taxable whether or not a form shows up. A client that paid you $500 sends nothing, a disorganized startup might send nothing even when it owed you a form, and board fees or foreign clients often fall outside the reporting rules entirely. None of that changes what goes on your Schedule C.
The forms are the IRS's cross-check, not your source of truth. The clean workflow is to invoice from one system, track every payment as it lands, and then compare January's 1099s against your own totals. If a client's 1099-NEC overstates what they actually paid you, ask them to correct it before you file, because the IRS matches those forms against your return. If it understates, report your real number anyway. Multi-client income is exactly where tidy books earn their keep.