Almost every Australian founder who talks to a US fund hits the same question early: are you a Delaware C-Corp? For most Australian companies the answer is no, and the follow-up is whether you’d be willing to flip.

A Delaware flip, also called a flip-up, is the restructure that puts a US parent company over your Australian business. It’s the standard path for Australian startups chasing serious US capital, and it’s not a form you fill in on a Friday afternoon. It carries real legal complexity, significant tax consequences and ongoing costs that are worth understanding before you commit.

In this article, we walk through what a flip actually involves, why US investors push for it, the tax issues that need real advice, what it costs, and how to know if it’s the right move for your company.

What a Delaware flip actually is

A flip inserts a new holding company, almost always a Delaware C-Corp (the US TopCo), above your existing Australian company (the AusCo). The mechanics are straightforward in outline. You incorporate the US TopCo. Your existing AusCo shareholders then transfer their shares to the US TopCo and receive new US TopCo shares in the same numbers and proportions, with no cash changing hands. The AusCo becomes a wholly owned subsidiary. And any options, ESOP, SAFEs, convertible notes or warrants on issue in the AusCo are cancelled and reissued as equivalent instruments over the US TopCo.

The key thing to hold onto is that this is not a relocation of your business. The AusCo keeps operating with the same ABN, the same team, the same customers and the same IP. You’ve simply added a US company on top and moved the cap table up to it. Delaware specifically, because it’s the default home of US corporate life: the large majority of venture-backed US startups are incorporated there, its corporate law is flexible and predictable, and every US investor, lawyer and court already understands it.

Why US investors want it

Two reasons: familiarity and tax. US funds have spent decades investing through standardised Delaware structures. Their SAFEs, convertible notes, preferred-equity terms and governance expectations are all built on Delaware law. Asking them to invest directly into an Australian Pty Ltd means asking their lawyers to get comfortable with the Corporations Act and ASIC compliance, and most won’t bother when the next deal in their pipeline is already a Delaware C-Corp. A flip doesn’t improve your odds of raising. It’s table stakes for being considered at all.

The tax pull is QSBS. Under Section 1202 of the US tax code, investors in qualifying small business stock issued by an eligible US C-Corp can exclude a large slice of their US federal capital gains, and the 2025 reforms made it more generous still. For stock acquired after 4 July 2025, investors get a 50% exclusion after a three-year hold, 75% after four years and 100% after five, with the per-investor cap lifted to the greater of US$15 million or ten times their cost base, and the company able to hold up to US$75 million in gross assets and still qualify. An Australian company offers none of that. Some accelerators, Y Combinator among them, also require US incorporation, so for founders targeting those programs a flip is simply a precondition.

The tax considerations, where you need real advice

This is the part to take to a specialist rather than a blog. At a high level, here are the areas that matter.

Capital gains tax and rollover relief

When your shareholders swap AusCo shares for US TopCo shares they’re technically disposing of a CGT asset, which can trigger a tax bill even though no cash has changed hands. Relief is usually available to defer it. The rollover normally used is Division 615 of the Income Tax Assessment Act 1997, the top-hatting provision designed precisely for inserting a new company above an existing one. Broadly, it requires every shareholder to participate, the US TopCo to end up owning 100% of the AusCo, the US TopCo to be a nominal-value shell beforehand, and the ownership proportions to be mirrored afterwards. Subdivision 124-M scrip-for-scrip rollover is the alternative, used mainly where the US TopCo already exists or a merger is involved, and it needs the US TopCo to acquire at least 80% of the voting shares. Relief is not automatic, and confirming eligibility sometimes calls for a private binding ruling from the ATO.

The tax-residency trap

A company can be an Australian tax resident if its central management and control sits in Australia, regardless of where it’s incorporated. If every US TopCo director is in Australia and every board decision is made from Melbourne or Sydney, the ATO may treat the US parent as Australian-resident, which defeats much of the point of the flip. The fix is genuine US governance: at least one US-resident director and board decisions actually made outside Australia, not just on paper. The flip side is an exit-tax risk if the US TopCo later stops being an Australian resident, so this needs deliberate design from the start.

Intellectual property

The AusCo normally keeps ownership of the IP and licenses it within the group rather than selling or transferring it, which avoids an upfront tax charge on the IP itself. Moving IP or assets out of the AusCo before the flip is exactly the kind of step that can create double tax, so it shouldn’t be done casually.

Your employee share scheme

AusCo options are cancelled and replaced with options over the US TopCo. That can have tax consequences for participants under Division 83A, particularly if the replacement is treated as a fresh grant rather than a continuation of the original scheme. Restructure relief may be available, again sometimes via a private ruling. There’s also a knock-on for valuation: once a US parent exists you need a 409A valuation, which usually becomes the group-wide number and lifts strike prices for future Australian grants. We cover that in detail in our piece on what a US hire does to your employee share scheme.

Australian incentives

The R&D Tax Incentive is the big one here. It usually survives a flip, but only if the AusCo keeps developing and owning the IP rather than becoming a contract developer for the US parent. How the money flows matters too: it’s normal for the US TopCo to raise the capital and pass it down to the AusCo, and a genuine loan or equity injection is fine, but having the parent reimburse or pay for the R&D is what puts the incentive at risk. Even when all of that is right, the worldwide group turnover test can still cost you the cash refund as your US sales scale. It matters enough that we’ve written it up on its own: see our piece on keeping your R&D Tax Incentive when you expand to the US.

One smaller point: Australian shareholders will no longer receive franking credits on dividends paid by a US parent, though for most startups that’s years away.

Cost and timeline

A clean flip with a simple cap table typically takes four to six weeks, or six to eight if it runs alongside a funding round. Cost estimates vary with adviser and complexity, from roughly US$30,000 at the simple end up to around AUD$40,000 to $80,000 once you add coordinated Australian and US legal, tax and accounting advice. Expect ongoing costs too, in the order of AUD$10,000 to $20,000 a year, covering US federal and state filings, a modest Delaware franchise tax, a Delaware registered agent and the overhead of reporting across two jurisdictions. Where the flip runs with a raise, these costs are usually funded from the round.

What you give up

A flip is close to irreversible. Unwinding it later is hard and expensive, so you’re committing to the US parent structure for the foreseeable future. You take on dual-jurisdiction compliance, two sets of corporate obligations and higher ongoing legal costs, and you sit in a more litigious environment.

There’s also an ASIC wrinkle: once the AusCo is controlled by a foreign company, it generally has to prepare and lodge audited financial statements with ASIC regardless of its size, because foreign-controlled small proprietary companies lose the usual small-company reporting exemption. Relief is available where the company is small and not part of a large group, but it’s not automatic and the directors have to claim it.

When it’s right, and when to wait

Flip when there’s a concrete reason: a US fund whose term sheet requires it, a primary market and real operations in the US, a US accelerator that mandates it, or an exit path pointing at a US trade sale or listing. Don’t flip on aspiration. “We might raise from the US one day” doesn’t justify the cost and complexity. “We have a US term sheet that requires it” does.

And the timing rule almost everyone agrees on is to flip early or in parallel with the raise, not late, because a simpler cap table and a lower valuation make the restructure cleaner, cheaper and less risky.

Getting it done

A flip touches corporate, tax, employment and securities law across two countries, so you want coordinated Australian and US corporate lawyers plus Australian and US tax and accounting advisers, ideally working as one team.

Before you start, get your AusCo registers, cap table history and constituent documents in order, and bring your shareholders along early, because every one of them has to participate and a single holdout can stall the process. Afterwards, the housekeeping includes getting a US EIN, opening a US bank account, and migrating your ESOP and cap table onto the US parent, often using a platform such as Carta or Cake.

Done well, it’s table stakes. Done poorly, it’s expensive

Done well, a flip puts you in front of the deepest pool of venture capital in the world. Done poorly, it creates tax bills, governance headaches and a structure that’s expensive to run and nearly impossible to reverse. Treat it as a deliberate, well-advised decision, not a default.

Disclaimer: This article is for general informational purposes only and does not constitute financial, legal or tax advice. Please speak with a qualified adviser (hey, that’s us!) before making decisions based on your specific circumstances.