Scaling Overseas

The default for early-stage UK startups is to operate from the UK parent across all markets, hiring contractors or using EOR (employer of record) services in foreign markets until the local hiring volume justifies its own entity. Most UK startups can run this way to about £2-£5m revenue or 5-10 hires in any single foreign market.

The triggers to incorporate locally: payroll requirements (most countries require local payroll once you have 1-3 local employees, EOR aside), regulatory permissions (local financial-services licensing typically requires a local entity), customer expectations (large enterprise customers in some markets require contracting with a local entity), or tax-substance requirements (some VAT-recovery and treaty-protection arrangements require a local presence).

Specialist startup accountants run the trigger analysis quarterly during international expansion. Incorporating too early adds 6-figure operational cost without revenue benefit; waiting too long creates substance problems that turn into permanent-establishment exposure (where the foreign tax authority asserts the UK parent has a taxable presence locally without registering one).

The US is the most common first overseas entity for UK startups, particularly those raising US venture capital or selling enterprise software. The standard structure is a Delaware C-Corp parent with a UK operating subsidiary, established at the point a US-led round is anticipated. The flip, converting the existing UK company into a US-parented structure, is doable but creates capital gains crystallisation events for founders and investors that need careful management.

Before flipping, the alternatives: a US C-Corp subsidiary of the UK parent (simpler but limits US fundraising), keeping a UK-only structure and selling into the US through the UK entity (works for B2B SaaS up to ~£5m ARR, becomes hard above that for various reasons), or a Cayman or Singapore holding structure for international groups (rare for startup stage).

The right answer depends on the funding strategy. UK-VC-led startups stay UK-parent through Series A or B and consider flipping at later stages if US public-market exit becomes likely. US-VC-led startups frequently flip pre-Series A so the round closes into the standard US structure their LPs expect. Specialist startup accountants who handle international groups run this analysis with the founder before the first US-led conversation.

Post-Brexit, the UK is a third country to the EU for VAT and customs purposes. UK B2B services to EU businesses are typically zero-rated for UK VAT with the EU customer accounting under domestic reverse charge. UK B2C services to EU consumers (digital downloads, SaaS, streaming) need to be accounted for under either local VAT registration in each EU country or the One Stop Shop (OSS) scheme, which lets a UK supplier file a single quarterly return covering all EU-domestic VAT.

Physical goods are more complex. UK exports to the EU need customs declarations and zero-rate evidence. Imports from the EU pay UK VAT (typically deferred under Postponed VAT Accounting). Distance sales to EU consumers above the country-specific threshold trigger local VAT registration unless the supplier uses the IOSS scheme for low-value imports.

The decision matrix for an early-stage UK startup selling into the EU: B2B-only services suppliers can usually run on the standard reverse-charge framework with one VAT registration in the UK; B2C digital suppliers should register for OSS at registration to avoid scrambling once thresholds are exceeded; physical-product e-commerce typically needs an EU-based VAT solution (OSS plus IOSS plus a fulfilment centre or freight forwarder) from day one.

Transfer pricing is the regime that requires intercompany transactions (between the UK parent and any foreign subsidiary) to be priced at arm's length, what would be charged between independent parties. The rules apply to companies of any size; the documentation requirements scale up at SME thresholds (€50m revenue) but the underlying obligation to price intercompany transactions correctly applies from day one.

Common intercompany flows in early-stage groups: management charges (UK head-office costs allocated to the local sub), IP licensing (UK-developed IP licensed to the local sub for local exploitation), service fees (UK developers building product used by the local sub), and cost-plus arrangements (the local sub charges its costs plus a margin back to the parent).

The most common error: under-charging the foreign subsidiary so it loses money locally and the UK parent absorbs the cost. This shifts profit to the UK (where corporation tax is lower than many comparable jurisdictions) and creates transfer-pricing exposure when the foreign tax authority audits. Specialist international-tax accountants set up the intercompany framework at sub-incorporation and benchmark it annually.

An EOR (employer of record) service like Deel, Remote, or Oyster lets a UK startup hire foreign employees without incorporating a local entity. The EOR acts as the formal employer in the foreign jurisdiction, handles local payroll and benefits, and bills the UK startup monthly for the loaded cost. Total cost is typically 10-15% above the gross salary plus EOR fee (£500-£1500 per employee per month).

EORs work well for the first 1-5 hires in any market. Beyond that, the cost-benefit shifts toward incorporating a local entity and running payroll directly. The decision points: EOR cost approaching incorporation cost annualised, regulatory or contracting requirements that need a local entity, or strategic intent to build a substantial local team.

Foreign contractors (rather than employees) are a separate question. The UK off-payroll working rules (IR35) generally don't apply to foreign-resident contractors, but the foreign jurisdiction's worker-status rules will apply locally. Misclassifying a foreign worker as a contractor when local rules say employee creates substantive exposure, back-employment-tax, social security shortfalls, and labour-law claims.

Founder relocation is the highest-stakes individual tax decision in international expansion. Moving from UK to US tax residency in the run-up to an exit can trigger UK CGT on the unrealised gain (the deemed-disposal exit charge) and create US tax exposure on subsequent appreciation. The treaty position helps but doesn't eliminate the issue. Founders should run the personal-tax model 12-24 months before the relocation event.

Dual residency is more common than founders expect. Spending more than 183 days in another country in any tax year typically triggers tax residency there; some countries (US, Australia) have other tests too. Many UK founders building US-facing startups end up tax resident in both jurisdictions for at least some years, with tax-treaty tie-breakers determining the primary jurisdiction.

US ties are particularly punitive. Any US person (citizen, green-card holder, sufficiently long-resident) faces US worldwide tax obligation regardless of UK residency, with PFIC rules that severely tax investments in non-US funds and CFC rules that look through controlled foreign corporations. UK founders with US passports or green cards need to involve a US tax specialist on top of the UK accountant.