The trade-off is straightforward but significant. An S corporation passes income and losses through to shareholders, who report everything on their own tax returns. A C corporation pays tax at the entity level first, and profits distributed as dividends may be taxed again at the shareholder level.
This guide walks through the mechanics, the tax consequences, and the strategic reasons businesses make this switch. We'll also cover outside investment, retained earnings, ownership changes, stock flexibility, transition-year filing quirks, and what Australian owners of US entities need to check separately.
Key Takeaways
- C corporation status suits businesses planning to raise institutional capital, issue preferred stock, or retain profits for growth
- Conversion triggers immediate planning questions around accumulated adjustments, shareholder basis, and short-period returns
- The right structure depends on projected profits, distributions, and exit plans, not a single headline tax rate
- Australian owners need separate advice on residency, CFC attribution, withholding, and treaty rules
Understanding S Corporation and C Corporation Status
Every US corporation starts life as a C corporation for federal tax purposes. It only becomes an S corporation once it files a valid election under IRC Section 1362(a). No election means no S status, by default.
The difference between the two comes down to where the tax bill lands.
- S corporations pass income, deductions, and credits straight through to shareholders, who report them on individual returns regardless of whether cash was actually distributed
- C corporations pay corporate-level tax on profits, and shareholders are only taxed again if and when the company distributes dividends
Why Not Every Business Can Be an S Corporation
S status comes with strings attached. The IRS sets clear eligibility limits:
- Caps ownership at 100 shareholders
- Restricts eligible owners to individuals, certain trusts, and estates (partnerships, corporations, and nonresident aliens generally don't qualify)
- Requires a single class of stock, though differing voting rights are permitted
C corporations face none of these restrictions. They can issue preferred and common stock with different economic rights, accept foreign or institutional investors, and grow ownership well beyond 100 people. That flexibility is often the deciding factor when a company starts courting outside capital.
Tax Implications of Converting from an S Corporation to a C Corporation
Revoking the S election changes the tax clock, not the company's legal existence. Once the revocation takes effect, the corporation files and pays tax as a C corporation going forward. Current IRS filing deadlines should always be verified before acting, since timing rules shift and the IRS's revocation guidance is the authoritative source.
The Double Taxation Question
C corporations face a potential two-layer tax structure. The corporation pays tax on its profits under federal corporate tax law, then shareholders pay tax again when those profits are distributed as dividends. Retained earnings sitting inside the company are not automatically taxed to shareholders as dividends simply because the company keeps them. Tax only applies when a distribution actually occurs.
Transition-Year Reporting Gets Complicated
If revocation happens midyear, the company effectively files two short-period returns: one as an S corporation, one as a C corporation. Income and deductions must be allocated between the two periods, typically on a pro-rata daily basis, though a closing-of-the-books method is available if every affected shareholder consents.
Before converting, review these items carefully:
- Accumulated adjustments account (AAA) balances, which affect how future distributions are taxed
- Shareholder stock and debt basis, which determines gain or loss on distributions and loss deductibility
- Suspended losses that may be limited once S status ends
- Accumulated earnings and profits, relevant to accumulated earnings tax exposure
Speak with a tax professional who can confirm current IRS authority on each point. The numbers depend entirely on your company's specific financial history.
Operational Changes Worth Flagging
Becoming a C corporation can shift several practical matters:
- Fringe benefit deductibility for shareholder-employees
- Charitable contribution limits
- Capital loss treatment
- Accounting methods
C corporations are generally barred from the cash method of accounting unless they fall under specific exceptions, such as meeting a gross-receipts threshold.
If the business has subsidiaries, including a Qualified Subchapter S Subsidiary, revocation can trigger deemed transactions or consolidated filing decisions. Groups with subsidiaries or meaningful liabilities should get specialist review before filing anything.
Benefits and Strategic Reasons to Convert to a C Corporation
The appeal of C corporation status usually comes down to one thing: access to capital and ownership flexibility that S corporations simply can't offer.
Investor Access
Venture capital funds, private equity firms, and many institutional investors are often structurally excluded from holding S corporation stock, or they simply prefer not to deal with pass-through tax reporting. Converting removes that barrier entirely.
Ownership and Equity Flexibility
Without the 100-shareholder cap and one-class-of-stock rule, a C corporation can:
- Issue preferred shares with liquidation preferences
- Differentiate economic rights between investor classes
- Build out employee equity plans at scale
- Prepare for a future public listing
Retaining Earnings for Growth
C corporations can retain profits inside the business to fund inventory, hiring, product development, or acquisitions without those profits flowing through as taxable income to shareholders each year. That said, retained earnings need a genuine business purpose.
Accumulating profits well beyond the reasonable needs of the business can trigger accumulated earnings tax exposure, and it doesn't eliminate corporate-level tax on the profits themselves.
When Pass-Through Tax Becomes a Cash-Flow Problem
Some S corporation shareholders end up owing tax on income they never actually received in cash, particularly when the company reinvests profits rather than distributing them. Converting can relieve that specific cash-flow pain. Treat this as cash-flow relief, not overall tax savings. Moving the tax burden to the corporate level does not necessarily cut total tax once dividends are paid out.
| Factor | S Corporation | C Corporation |
|---|---|---|
| Tax layers | Single (pass-through) | Potentially two |
| Shareholder count | Capped at 100 | Unlimited |
| Stock classes | One class only | Multiple classes allowed |
| Institutional investors | Often restricted | Generally accessible |
| Retained earnings | Taxed to shareholders regardless | Taxed only at corporate level until distributed |
How to Convert an S Corporation to a C Corporation and Manage the Transition
Revocation is a voluntary, shareholder-driven process rather than something the IRS initiates.
- Secure shareholder approval. More than 50% of outstanding shares, including nonvoting shares, must consent to the revocation.
- Prepare the written revocation statement. It needs the corporation's name, address, EIN, the revocation declaration, intended effective date, and shareholder consent details.
- File with the correct IRS service centre, specifically the one where the original S election was filed.
- Choose your effective date carefully, since timing drives which tax year the change applies to. Always verify current IRS procedures before filing, as deadlines can shift.
Building Your Transition Checklist
A clean transition relies on having records in order well before the effective date:
- Board and shareholder resolutions authorising the change
- Copies of IRS correspondence confirming the revocation
- Payroll records and distribution history
- Shareholder basis schedules, AAA, and earnings-and-profits records
- Updated financial statements and any required state registrations
Midyear Changes Add Complexity
A midyear revocation means two separate federal return periods, income allocation between them, adjusted bookkeeping, and coordination across payroll and estimated tax filings. This isn't a set-and-forget change; it touches nearly every part of the company's accounting calendar for that year.
Distributions During the Post-Termination Transition Period
After revocation, a post-termination transition period lets certain cash distributions reduce shareholder stock basis rather than trigger dividend treatment, provided they stay within AAA limits.
That window is not automatically tax-free and it has a defined end date. Model available cash, AAA balance, and distribution timing before you revoke, not after.
Before filing, build a written comparison of your current S corporation position against likely C corporation outcomes under several scenarios:
- Retained profits
- Regular dividend payments
- New investor funding
- A loss year
- An asset sale
- A stock sale
Running the numbers across these cases tends to surface issues a single projection would miss.
For Australian businesses with US entities, cross-border coordination matters as much as the US mechanics. VJM Global supports clients with cross-border tax, accounting, compliance, and financial reporting across US and Australian jurisdictions.
Any conversion decision should still involve advisers licensed in both countries, working from the same set of facts.
Is Converting to a C Corporation Right for Your Business?
Run through this checklist before deciding:
- Are you actively seeking outside investment from venture capital, private equity, or corporate investors?
- Do current or prospective shareholders fail S corporation eligibility tests?
- Do you need multiple stock classes with different economic rights?
- Does the business plan to retain profits rather than distribute them regularly?
- Are shareholders currently facing tax bills without matching cash distributions?
- Is an ownership change, acquisition, or exit on the horizon?
If most answers point toward growth capital and complex equity structures, C corporation status likely fits better.
Staying an S corporation often makes more sense for a closely held business that distributes profits regularly, benefits from passing through losses to shareholders, and has no near-term need for institutional investors or multiple stock classes.
A Separate Layer for Australian Owners
If you're an Australian resident who owns a US corporation, the US entity-classification decision and your Australian tax position are two distinct questions. Converting to a C corporation doesn't resolve, or create, Australian tax obligations on its own. You'll still need to separately review:
- Your Australian tax residency status
- Worldwide income reporting obligations
- Dividend withholding under the US-Australia treaty
- Controlled foreign company attribution rules, which can tax specified income to Australian residents even without an actual distribution, under ATO's CFC guidance
Coordinate advice from qualified US and Australian tax professionals rather than assuming one set of rules covers both sides.
Frequently Asked Questions
How do I know if I am an S or C corporation?
Check your formation documents, prior federal tax elections, past corporate tax returns, and any IRS notices confirming your election status. When in doubt, confirm directly with a tax professional before filing anything new.
How do I know if a basis computation is required for an S corporation?
Basis computations matter whenever you need to assess whether a distribution is taxable or whether a loss is deductible. The calculation tracks stock basis, debt basis, contributions, income, deductions, and distributions over time.
Can I use my S-Corp for more than one business?
One S corporation can legally run multiple activities under its single entity structure. However, separate legal entities often offer better liability protection, cleaner accounting, and clearer state registrations depending on the businesses involved.
What is the difference between an S corporation and a C corporation?
S corporations pass income through to shareholders but face strict ownership and stock-class restrictions. C corporations pay tax at the entity level, with fewer restrictions on ownership structure and stock flexibility.
How do I convert an S corporation to a C corporation?
Conversion involves voluntarily revoking the S election, obtaining the required shareholder consent, and filing with the appropriate IRS service centre. Effective-date planning and modelling of transition-year and distribution consequences should happen before filing.
Can I switch back to an S corporation after converting?
Re-electing S status after revocation can be restricted for a period under current IRS rules, and eligibility depends on your specific circumstances at the time. Review this possibility with your tax adviser before filing the initial revocation, not afterward.
