S Corporation to C Corporation conversion tax consequences

Quick answer: The documents provided don't directly address the tax consequences of converting an S corporation to a C corporation (i.e., revoking or terminating the S election). I can't give you a reliable answer to that specific question from the materials on hand, but I can flag what I do and don't have, and offer very brief general orientation.

What the documents cover (and don't)

None of the uploaded excerpts — IRS Publications 550 (investment income), 544 (asset dispositions), 946 (depreciation), 527 (rental property), or 541 (partnerships) — discuss S corporation elections, terminations, or the tax effects of switching from S corp to C corp status. The closest related material is Publication 541's discussion of partnership terminations and conversions of partnerships into LLCs, but that concerns a different entity type entirely and doesn't extrapolate to S-corp-to-C-corp conversions.

For example, Publication 541 explains that the conversion of a partnership into an LLC classified as a partnership for federal tax purposes doesn't terminate the partnership, is not a sale, exchange, or liquidation of any partnership interest, the partnership's tax year doesn't close, and the LLC can continue to use the partnership's taxpayer identification number (TIN).¹ That's a useful illustration of how entity-conversion rules can work, but it's specific to partnership-to-LLC conversions, not S-to-C corporation status changes, so it shouldn't be relied on as an analogy for your situation.

General background (not from these documents — for orientation only)

Converting from S corp to C corp status generally involves revoking the S election with the IRS, which typically:

• Ends the S corp's tax year and requires a short-period S return plus a separate C corp return for the remainder of the year
• Triggers double taxation going forward (corporate-level tax, then shareholder-level tax on dividends)
• Can affect shareholder basis, accumulated adjustments account (AAA) treatment, and built-in gains rules if you later wanted to convert back
• Has a 5-year waiting period before re-electing S status in most cases

This is general background only — I don't have IRS Publication 589 (S Corporations) or the relevant Code sections (like §1362) in the documents to verify specifics, dollar thresholds, or current-year procedural details.

What it depends on

• Why you're converting (e.g., raising capital, adding disqualified shareholders, changing ownership structure)
• Your corporation's accumulated earnings, basis, and any built-in gains
• Whether Public Law 119-21 (OBBBA, enacted July 2025) changed any relevant corporate provisions since older guidance was written

Because this involves entity elections, potential double taxation, and possibly irreversible timing decisions, this is a good time to sit down with a CPA who can review your specific corporate structure and shareholder situation before you act.