Delaware C Corp vs UK Ltd | A Guide for US Fundraising

US venture capital is the deepest pool of startup money in the world. In 2025, US companies raised about $274 billion, close to 64 percent of all global venture funding, according to Crunchbase. For UK and European founders, that pull is hard to ignore.

So at some point the same question lands. Do I raise into my UK Ltd, or do I need a Delaware C Corp first? We look at the timing side of that in do you need a US entity to raise investment, and at the wider funding market in our US venture capital guide.

This guide goes wider. It compares the two structures, sets out the UK and US tax picture, explains how a flip actually works, and covers the part most articles leave out: what running the US entity involves once you incorporate. That last piece is where founders lose time and money, and it is where we spend our days.

Delaware C Corp vs UK Ltd at a glance

Both are limited-liability companies. Both separate your personal assets from the business. The differences that matter for fundraising sit in investor familiarity, equity, tax, and admin. Here is the short version.

The rows that cause the most confusion are tax and timing, so we will unpack those below.

What a UK Ltd is

A UK private limited company is the default for British founders. You register it with Companies House, usually within a day or two, for a small fee. It suits UK investors and works with SEIS and EIS relief, which many UK angels expect.

Its corporation tax runs at a 25 percent main rate, with 19 percent on profits under £50,000 and marginal relief in between. Profits are taxed once. It is cheap to run and simple to file.

What a Delaware C Corp is

A Delaware C Corporation is the standard structure for US-backed startups. It issues shares and separates shareholders from directors and officers. It sits under Delaware corporate law, which is old, tested, and well understood by US investors and their lawyers.

It pays US federal corporate tax at 21 percent, plus state tax wherever it operates. More than two thirds of Fortune 500 companies are incorporated in Delaware, so the ecosystem around it runs deep. Our guide to incorporating in Delaware walks through the mechanics.

The tax picture: SEIS, EIS, and QSBS

Tax reliefs pull founders in opposite directions, so this is worth getting right.

On the UK side, SEIS and EIS are among the most generous investor incentives anywhere. SEIS gives investors 50 percent income tax relief. EIS gives 30 percent. Both only work for UK-incorporated companies. Form a US entity instead of a UK Ltd and you lose access to that pool of UK angels.

On the US side, the equivalent is QSBS, Qualified Small Business Stock. It applies to US C corporation shares, not UK companies. It lets founders, early employees, and investors exclude a large slice of their gain from US federal tax at exit.

QSBS changed in July 2025. For shares issued after 4 July 2025, the exclusion is tiered: 50 percent after three years, 75 percent after four, and 100 percent after five. The per-shareholder cap rose to $15 million or 10 times cost, and the company gross-asset ceiling rose to $75 million, as the AICPA’s Tax Adviser explains. That change made the C corp more attractive to US investors, not less.

Here is the tension. A UK Ltd keeps SEIS and EIS open. A Delaware C Corp opens QSBS. You cannot casually hold both, and a flip can put SEIS and EIS at risk unless it is handled with care. More on that below.

Why US investors prefer the Delaware C Corp

Most US venture funds are built to invest in Delaware C Corps. Some have it written into their fund terms. The reasons are practical, not snobbery:

• Their lawyers know Delaware law, so due diligence is faster and cheaper.
• Preferred shares, option pools, and SAFEs all work cleanly in a C Corp.
• QSBS gives US investors a real tax reason to want C corp stock.
• A US parent makes a future US sale or IPO simpler.

A US investor reading a strong deck may still say the same thing. We would invest, but we need you to be a Delaware C Corp first. That one sentence is what sends most founders looking for answers.

The real question is not which, but when

Here is the part most comparison articles skip. A Delaware C Corp does not make you more fundable on its own. Investors back companies, not structures.

Investors also tend to fund businesses in their own country. They know the market, they can meet the team, and they understand the local paperwork. So a UK Ltd is not a wall for every US investor, especially at seed stage, where some US funds invest internationally already.

The structure question is really about timing. Flip too early and you pay for admin and advisers you do not need yet. Flip mid-raise and you can add six to eight weeks and stall your momentum. Getting the timing right matters more than the structure itself.

Two ways founders reach a Delaware C Corp

There are two common paths:

• Start fresh. If you have not incorporated yet and know you are raising from US investors, you can form the Delaware C Corp from day one. There is nothing to unwind.
• The Delaware flip. Your existing UK Ltd becomes a subsidiary of a new Delaware parent. Shareholders swap UK shares for US shares, so the US company sits at the top of the cap table.

The flip rearranges ownership, not geography. Your UK team, contracts, and payroll can stay where they are. What changes is the entity investors put money into.

How a Delaware flip actually works

The flip is a share-for-share exchange. In plain terms:

1. You form a new Delaware C Corp, often called the parent, or “topco”.
2. Every shareholder in the UK Ltd is offered shares in the new US company.
3. They exchange their UK shares for US shares in the same proportions, so the cap table mirrors what came before.
4. The US company now owns the UK Ltd, which becomes a subsidiary.
5. Intellectual property is usually assigned or licensed to the US parent, and service agreements set out how the two entities work together.

Done well, the ownership split stays identical. A 25 percent UK shareholder holds 25 percent of the US parent. The business underneath does not move.

The UK tax traps on a flip

This is where founders get caught, and where most guides go quiet. The tax mechanics matter.

Capital gains tax. Swapping UK shares for US shares can be a taxable event for UK shareholders. With care, a flip can usually be structured without triggering a charge, but that is not automatic.

HMRC clearance. Where SEIS, EIS, or VCT investors are on the cap table, you apply for advance clearance under Section 138 of the TCGA 1992. HMRC has 30 days to respond, as Wilson Sonsini notes, so build that into your timetable.

Stamp duty. Transferring UK shares can attract stamp duty at 0.5 percent of value. Relief exists, but it is not automatic and must be claimed correctly.

Keeping SEIS and EIS alive. To preserve SEIS or EIS relief after a flip, the new Delaware parent generally has to maintain a UK permanent establishment during the qualifying period. That means a real UK presence, not just the old subsidiary sitting underneath.

Permanent establishment and transfer pricing. If the US company is really run from the UK, HMRC may treat it as UK tax resident. A transfer pricing policy between the two entities helps manage that risk. Get this wrong and you can face UK corporation tax you did not plan for.

None of this is a reason to avoid a flip. It is a reason to plan it, take specialist tax advice, and not attempt it in the middle of a raise.

What a flip costs, and how long it takes

Costs vary with your cap table and how much IP you hold. A simple flip with few shareholders is cheaper. A messy cap table, multiple share classes, or SEIS and EIS investors all add work and cost.

As a rough guide, commonly cited estimates put a simple flip in the region of £30,000 to £60,000 in combined legal and accounting fees. Timelines usually run two to three months. Trying to flip during a live raise tends to add six to eight weeks and real uncertainty.

You are also signing up to run two companies from then on. That means two sets of accounts, two tax filings, and higher ongoing admin. It is workable, but it is a cost founders routinely underestimate.

What actually changes once you have the Delaware C Corp

This is the ground nobody covers well, and it is where a US entity earns or loses you money. Incorporating is the easy part. Running the company is the work, and it starts on day one.

A registered agent and a US address

Every Delaware corporation must have a registered agent with a physical Delaware address. The agent receives legal and state mail for you. Expect $50 to $300 a year. You will also want a real US business address for banking and clients. Many of our clients pair entity setup with a US virtual office, so they have one from the start.

An EIN before you can do much

An EIN is your US federal tax ID. You need it to open a bank account, run payroll, and file taxes. It is free from the IRS. Getting one without a US Social Security number takes longer, though, and it trips up first-time founders. Our step-by-step guide to getting an EIN sets out the order to do it in.

A US bank account

No US bank account means no clean way to receive investment or pay US staff. Opening one as a foreign founder is harder than it sounds, and some banks want an in-person visit. Getting the EIN, address, and paperwork in the right order saves weeks. That sequencing is what our team does every week.

Registration in the states where you operate

Incorporating in Delaware does not let you operate everywhere for free. Hire staff or open an office in another state and you usually register there too, as a “foreign” entity. California charges $100 to qualify plus a yearly statement, New York $225, and Texas $750. Each state also wants its own registered agent. Sorting these registrations in the right order keeps you compliant as you grow, and it is easy to miss one.

Franchise tax and the annual report, every year

Delaware charges an annual franchise tax and an annual report, both due by 1 March, per the State of Delaware. The report fee is $50. The franchise tax minimum is $175 under one method and $400 under the other.

One trap catches nearly every new founder. Delaware’s default calculation, the Authorized Shares method, can produce an alarming bill. A startup with 10 million authorised shares can see a figure near $85,000. The fix is to file using the Assumed Par Value method, which usually brings it back to a few hundred dollars. Miss the 1 March deadline and you face a $200 penalty plus interest, and Delaware can void your company. We make sure clients file the right way, the first time.

Two sets of books, not one

If you flipped, the UK Ltd still exists as a subsidiary. That means two sets of accounts, two tax filings, and transfer pricing rules on how the entities charge each other. It doubles the bookkeeping and it is easy to let slip. Keeping both sets clean and in step is a large part of what we do for cross-border clients.

Payroll, benefits, and your first US hire

Employ someone in the US and a new layer begins: payroll tax, benefits, workers’ compensation, and state-by-state employment rules. Founders budget the salary and forget the rest. A $120,000 hire can cost well over that once employer costs are added, as we set out in our guide to hiring your first US employee.

You do not always need the entity in place to start. Many founders make their first US hires through an Employer of Record while the Delaware structure is being set up, then move staff across once it is ready. That keeps hiring moving during a raise.

Free download: The US Fundraising Readiness Checklist

Before you sit across from US investors, run your structure and operations through our founder self-audit. It covers the six areas investors examine in diligence: entity and structure, cap table, intellectual property, US employment, bookkeeping, and US presence. Tick what is already in place, and see where your gaps are.

Download the US Fundraising Readiness Checklist »

When a UK Ltd is still the right call

Not every founder needs to flip, and rarely as early as they fear. A few honest signals:

• Pre-seed and seed: pressure to flip is low. Some US funds back UK companies at this stage.
• Series A with a US lead: pressure rises, and a US lead investor may require Delaware.
• US-first revenue or US enterprise customers: a US entity often helps with contracts and procurement anyway.
• Mostly UK investors and UK operations: you may not need it yet at all.

There is also a one-way-door point. Once you flip into a US parent, reversing it is difficult and costly. Many advisers suggest waiting until the flip is clearly needed rather than doing it on spec. If you are weighing the raise itself, our piece on what US investors look for in European startups is worth reading alongside this.

And if you are unsure which US state even makes sense, Delaware is common but not automatic. Where you operate, and where you plan to hire, can point you elsewhere, so it is worth pressure-testing before you file.

Where Foothold America fits

We are not a law firm, and we will not pretend the flip itself is our job. What we do is the operational reality that follows, the part that decides whether your US entity runs smoothly or bleeds time.

That means US entity setup, your registered agent and US address, EIN and bank account support, bookkeeping across both companies, payroll, and benefits. We also help you hire your first US employees through an Employer of Record before the entity is even ready, so fundraising and hiring do not wait on each other.

We are real people who do this every week for UK and European founders. If you want the wider picture first, our guide to expanding to the USA from the UK is a good place to start.

Get the structure, the tax, and the operations right, in the right order, and the US entity stops being a distraction. It becomes the base your raise is built on.

Further reading

• US Company Registration Guide