Real scenario · United Kingdom × SaaS

B2B SaaS founder from the UK forming a Delaware LLC

A London-based B2B SaaS founder forms a Delaware LLC for US-enterprise contracting alongside the UK Ltd.

By Zawwad, Founder, DelewarellcPublished May 15, 2026 · Last updated July 5, 2026

B2B SaaS founder from the UK forming a Delaware LLC

The challenge

London SaaS founder with US enterprise pipeline. UK-US treaty is sophisticated; CFC and qualified-dividend rules apply.

Banking path

All major banks approve. Mercury typical primary.

Tax compliance path

UK-US treaty applies. Engage UK chartered accountant for intercompany planning.

Formation path with Delewarellc

Standard 8-10 day timeline. UK Ltd parent often retained for EU customers and team.

Outcome

UK founder operates US-LLC for US revenue, UK Ltd for EU operations, sophisticated cross-border structure.

Why a London SaaS founder reaches for a Delaware LLC

A B2B SaaS founder operating from London already has a UK limited company that customers in Europe recognise and trust. The friction starts when the pipeline shifts toward American enterprise buyers. Procurement teams at US companies ask for a US vendor of record, a US tax form, and a US bank account into which they can pay an invoice without an international wire fee. A UK Ltd can technically receive those payments, but the experience for the buyer feels foreign, and foreign vendors get routed into slower approval queues. A Delaware LLC removes that hesitation. It gives the founder a domestic-looking counterparty that signs a US-law contract, issues a US-format invoice, and presents a W-9 instead of a W-8BEN-E.

The structure most London founders land on keeps the UK Ltd as the operating and employment entity while the Delaware LLC becomes the contracting and collection vehicle for American revenue. The LLC is disregarded for US federal tax when it has a single foreign owner, so it does not pay US corporate tax on its own. Instead the income flows back to the owner, and the UK-US treaty governs how that income is finally taxed. This is not a scheme to avoid tax. It is a way to make American customers comfortable while keeping the founder fully compliant in both countries.

The cost of the formation itself is modest. The Delaware Certificate of Formation is $110, and the recurring obligation is a $300 flat franchise tax due each June 1. Against an enterprise SaaS contract, those figures are small, which is why the structure makes sense for this profile.

The realistic banking approval picture from the United Kingdom

The United Kingdom sits in the most favourable banking tier for non-US founders. Every fintech that serves Delaware LLCs treats a UK passport and a UK address as low risk, so a London SaaS founder rarely faces the documentation back-and-forth that founders from higher-risk jurisdictions encounter. Mercury is the typical primary account because it pairs a US routing and account number with a clean dashboard and good support for software businesses. Approval generally hinges on a working website, a clear description of the SaaS product, and the EIN confirmation, all of which a real B2B founder already has.

Beyond Mercury, the founder usually opens at least one backup. Wise gives multi-currency holding accounts and is useful when a customer insists on paying in pounds or euros, because it lets the founder hold those balances rather than converting at a bad moment. Relay suits founders who want multiple sub-accounts to separate operating cash, tax reserves, and payroll funding. Lili and Payoneer round out the options, with Payoneer being handy when a US marketplace or a partner platform only pays out through it. For a UK founder, the practical advice is to open Mercury first, then add Wise so that currency flexibility exists from day one.

Opening these accounts is remote. There is no need to fly to the United States, and no US Social Security Number is required. The applications ask for the LLC formation documents, the EIN letter, the founder's passport, and proof of the UK residential address, which a recent utility bill or bank statement covers.

How B2B SaaS earns revenue and where it gets taxed

B2B SaaS revenue is recurring subscription income, usually billed monthly or annually, often with usage-based components layered on top. For a London founder, the American customers pay the Delaware LLC, the cash lands in the US bank account, and the question becomes where that profit is taxed. The LLC, being disregarded, does not shield income from tax. The income belongs to the founder, and because the founder is a UK tax resident performing the work from London, the UK is where the income tax obligation primarily sits. The United States generally does not tax this income when the founder has no US office, no US employees, and no dependent agent concluding contracts inside the country.

This is where the UK-US treaty earns its reputation as a sophisticated instrument. The treaty defines permanent establishment carefully, and software delivered over the internet from London does not create a US taxable presence on its own. The founder should still document this position rather than assume it. A UK chartered accountant who handles cross-border technology businesses can confirm that the LLC's profits are reported on the founder's UK self-assessment or rolled into the UK Ltd through an intercompany arrangement, depending on the chosen structure.

The cleaner the separation of roles, the easier this is to defend. If the UK Ltd employs the engineers and the Delaware LLC merely collects US revenue, an intercompany services agreement should price the work the Ltd performs for the LLC. That agreement keeps profit attribution honest and gives the UK adviser a clear paper trail.

The Form 5472 duty that catches founders off guard

A single-member Delaware LLC owned by a non-US person is disregarded for income tax, but it is not invisible to the IRS. The LLC must file Form 5472 together with a pro forma Form 1120 every year. This is an information return, not a tax bill. Its purpose is to report transactions between the LLC and its foreign owner, which for a UK SaaS founder includes capital the founder puts into the LLC and money the LLC pays or distributes back. Many founders assume that because the LLC owes no US income tax, it has nothing to file. That assumption is the most expensive mistake on this list.

The penalty for failing to file Form 5472, or for filing it late or incomplete, is $25,000. It applies per form per year, and the IRS issues it on a fairly automated basis. A London founder who forms the LLC, opens Mercury, signs a few enterprise deals, and then forgets the filing can find a five-figure penalty waiting the following year. The filing is due on the same schedule as a corporate return, generally by mid-April, with an extension available, so the deadline arrives only a few months into the new year.

The good news is that the filing itself is mechanical for a clean SaaS business. The reportable transactions are usually just the founder's contributions and the distributions back. A US accountant familiar with foreign-owned single-member LLCs prepares this each year as a fixed annual cost alongside the $300 franchise tax.

The formation timeline seen from the London time zone

From London, the formation process runs comfortably alongside the business day rather than against it. Delaware sits five hours behind, so a filing submitted in the London morning reaches Delaware before its offices open, and the founder typically sees movement by the London afternoon or evening. The Certificate of Formation is the first step, and Delaware processes standard filings quickly. The whole sequence from filing to a fully bankable entity runs about eight to ten business days, with the EIN being the part that takes the longest.

The EIN is free directly from the IRS via Form SS-4. Because the founder has no US Social Security Number, the application cannot be completed instantly online and instead goes through the manual process, which takes roughly eight to ten business days. Founders sometimes pay third parties large fees for an EIN, but the IRS charges nothing, and a competent formation service includes the SS-4 handling. The five-hour offset actually helps here, because responses from US agencies and banks tend to arrive overnight London time, so the founder reviews progress with their morning coffee.

Across the whole timeline the founder pays the $110 Certificate of Formation fee, and the one-time formation service we charge is $297. There is no separate EIN charge to the government, and the franchise tax does not arrive until the following June 1. A London founder can realistically go from decision to signed US enterprise contract inside a fortnight.

Currency, repatriation, and getting money back to the UK

American SaaS customers pay in dollars, so the Delaware LLC accumulates a dollar balance. The London founder eventually needs some of that money in pounds to draw salary, pay UK suppliers, or fund the UK Ltd. The repatriation path is straightforward but worth planning. Money moved from the LLC to the founder personally is a distribution from a disregarded entity, which means it is not a separate taxable event in the United States, though it is a reportable transaction on Form 5472. The UK tax treatment depends on how the founder's adviser characterises the income, which is another reason to settle the structure early.

On the mechanics, Wise usually gives the most honest exchange rate for converting dollars to pounds, because it uses the mid-market rate and shows the fee openly rather than burying it in a marked-up rate. A founder who holds a dollar balance in Wise or Mercury can choose when to convert rather than being forced to take whatever rate applies on payment day. For larger sums, timing conversions across the month smooths out exchange-rate swings instead of betting everything on one transfer.

Holding a working dollar reserve in the US account also has a practical benefit. Cloud bills, API costs, and US contractor payments are denominated in dollars, so paying them straight from the dollar balance avoids a round trip through pounds and back. The founder converts to pounds only for the portion that genuinely needs to live in the UK.

BOI reporting and what changed in 2025

Beneficial ownership information reporting under the Corporate Transparency Act caused a lot of anxiety among non-US founders when it first appeared, because it seemed to require every LLC to disclose its owners to FinCEN. For a London founder forming a Delaware LLC, the situation changed materially. Under the FinCEN Interim Final Rule of March 26 2025, entities formed in the United States are exempt from the BOI reporting requirement. A Delaware LLC formed by a UK founder is a US-formed entity, so it falls within that exemption.

This means the typical London SaaS founder does not file a BOI report for their Delaware LLC. It removes a step that many older guides still describe as mandatory, and it removes a recurring worry about updating ownership information whenever circumstances change. It is worth stating plainly, because outdated articles and forum posts continue to tell founders they must file, which leads to confusion and sometimes to founders paying for a filing they no longer need.

The exemption does not change the Form 5472 obligation, which is a separate IRS requirement with its own purpose and its own $25,000 penalty. Founders should keep the two ideas distinct. BOI exemption is about FinCEN and beneficial ownership disclosure. Form 5472 is about the IRS and related-party transactions. A UK founder skips the former and must complete the latter.

Common mistakes for the London SaaS profile specifically

The first mistake is treating the Delaware LLC as a way to escape UK tax. It is not. A founder who lives in London and runs the business from London is a UK tax resident, and the income remains within reach of HMRC. The LLC is a contracting and banking convenience, not a tax shelter. Founders who misunderstand this either underpay at home and face a correction later, or they overcomplicate the structure trying to engineer an outcome the treaty does not support. The honest framing keeps everyone out of trouble.

The second mistake is mixing the UK Ltd and the Delaware LLC without documentation. When the same founder owns both and the engineers sit in the Ltd while the revenue lands in the LLC, profit needs to be attributed sensibly between them. Without an intercompany services agreement, the numbers look arbitrary, and that arbitrariness becomes a problem during a funding round or a tax review. Putting the agreement in place early, with a defensible price for the Ltd's work, prevents a scramble later.

The third mistake is forgetting the US compliance calendar. The $300 franchise tax is due June 1, and Form 5472 is due in the spring with its $25,000 penalty for non-filing. A London founder focused on shipping product and closing American deals can let these slip. Setting calendar reminders or handing both to a service the moment the LLC is formed avoids the only genuinely costly errors in the whole structure.

Contracting with US enterprise buyers under US law

A large part of the reason a London founder forms the Delaware LLC is to make enterprise contracting smoother. American companies prefer to contract with a US entity governed by US law, often Delaware or New York law, because their legal teams understand it and their procurement processes are built around it. When the vendor of record is a Delaware LLC, the master services agreement, the data processing addendum, and the order form all read as domestic documents. That alone can shorten a procurement cycle that might otherwise stall on the question of contracting with a foreign supplier.

The LLC also lets the founder present a W-9 rather than a W-8BEN-E. The W-9 is the form a US vendor provides, and it signals to the customer's accounts payable team that no foreign withholding analysis is required on their side. This removes a recurring point of confusion. A UK Ltd billing directly would hand over a W-8BEN-E and sometimes trigger questions about treaty positions and withholding that slow down the first payment. With the LLC in place, the customer experience matches what their systems expect.

None of this changes where the work is performed or where the founder pays tax. It changes the wrapper around the relationship. For B2B SaaS, where deals are won and lost partly on how easy the vendor is to buy from, that wrapper has real commercial value beyond the tax and banking benefits.

Keeping the UK Ltd and the LLC in the right roles

The two-entity structure works only if each entity has a clear job. The UK Ltd is the place where people are employed, where EU and UK customers contract, and where the founder's local relationships with payroll, pensions, and HMRC already live. The Delaware LLC is the place where US revenue is collected and where US customers contract. Trying to collapse everything into one entity tends to reintroduce exactly the friction the founder was trying to remove, so keeping the split deliberate is the point.

Equity and ownership should be mapped before the first US deal closes. If the founder owns both entities personally, the simplest version has the founder as sole member of the LLC and sole or majority shareholder of the Ltd, with an intercompany agreement linking them. If UK co-founders share equity in the Ltd, decide early whether they also hold membership in the LLC, because a multi-member LLC is taxed as a partnership rather than a disregarded entity and the US filing changes accordingly. For most single-founder SaaS businesses, a single-member LLC is the cleaner choice.

The aim is a structure that an investor's lawyer can read in a few minutes and a tax adviser in either country can sign off without a long conversation. Clear roles, documented intercompany pricing, and a single owner where possible deliver that. Complexity added without a reason is complexity that someone has to explain later.

Capital-raise readiness for a transatlantic SaaS

B2B SaaS founders in London often have one eye on raising from US investors, and the structure they choose at formation affects how easy that is. US venture investors are comfortable with Delaware entities, and many prefer to invest into a Delaware structure rather than directly into a UK Ltd. A founder who already operates a Delaware LLC has taken a first step toward a structure US capital understands, though a priced venture round usually involves converting to or sitting beneath a Delaware C corporation, because that is the form institutional investors expect to hold preferred stock in.

The practical point for the formation stage is to avoid creating a mess that has to be unwound later. Clean ownership, documented intercompany agreements, and tidy bank records make any future restructuring or flip far cheaper. A founder who has commingled personal and company money, skipped the intercompany agreement, or missed US filings will spend time and legal fees cleaning that up before an investor will wire funds. Doing it properly from the start is the cheaper path.

It is worth saying that not every SaaS founder raises, and many run profitable businesses that never take outside capital. For those founders the LLC structure is the destination, not a waypoint. The advice to keep records clean and filings current applies either way, because it serves both the bootstrapper and the founder who later decides to raise.

Working with a UK chartered accountant on the cross-border side

The single most valuable professional relationship for this profile is a UK chartered accountant who has handled technology businesses with US revenue. The US side of a clean single-member LLC is mechanical, but the UK side is where the real planning happens, because that is where the founder actually pays tax. The accountant decides how LLC income is reported, whether it flows through self-assessment or via the UK Ltd, and how the intercompany pricing is set so that profit lands in a defensible place.

This adviser also handles the interaction between the founder's personal position and the entities. Questions about how distributions from the LLC are characterised, how the UK treats a disregarded US entity, and how the treaty applies to specific income streams are all matters of UK professional judgement informed by the founder's full circumstances. Generic guidance can describe the shape of the answer, but only an adviser who knows the founder's numbers can give the actual answer.

On the US side, a smaller and more contained relationship suffices. A US accountant who prepares Form 5472 and the pro forma 1120 each year, plus the founder or a service handling the June 1 franchise tax, covers the American obligations. The division of labour is natural. The UK accountant owns the substantive tax planning, and the US preparer owns the annual US information filings, with the founder making sure neither deadline is missed.

A practical step-by-step for the London founder

Start by confirming the structure with a UK chartered accountant before filing anything. Decide whether the Delaware LLC sits alongside the existing UK Ltd as a single-member contracting entity, and confirm that a single-member disregarded LLC fits the ownership picture. With that settled, file the Delaware Certificate of Formation for $110 and choose a registered agent. Using a formation service that includes the SS-4 handling at the $297 one-time price keeps the EIN process straightforward, since the EIN itself is free from the IRS and takes roughly eight to ten business days for a non-US founder.

Once the EIN letter arrives, open Mercury as the primary account using the formation documents, the EIN letter, the passport, and proof of the London address. Add Wise next so you can hold dollars and convert to pounds on your own timing, and consider Relay or Payoneer if your workflow needs them. With banking live, present a W-9 to US enterprise customers and contract through the LLC. There is no BOI filing to make, because the US-formed LLC is exempt under the March 26 2025 FinCEN Interim Final Rule.

Finally, put the compliance calendar in place the day the LLC is formed. Mark the $300 franchise tax due June 1 and the Form 5472 filing due in spring, remembering the $25,000 penalty for missing it. Engage a US accountant for the annual 5472 and pro forma 1120, keep an intercompany services agreement between the LLC and the UK Ltd, and review the whole structure with your UK accountant once a year. That routine keeps a transatlantic SaaS business compliant in both countries with very little ongoing effort.

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