Most US growth and crossover investors won't lead a round into a UK Ltd parent. They want a Delaware C-corp at the top of the cap table. The 'flip' — inserting a Delaware Inc as the new parent of your existing UK Ltd — is the standard solution. Done well, it unlocks US capital. Done badly, it creates a tax bill, kills your EMI options, and burns six months of legal cycles.
When to flip
- A US lead investor has signalled they will only invest into a Delaware parent.
- Majority of revenue, customers, or strategic partners are US-based.
- You are within 18 months of a planned US IPO or NYSE/Nasdaq dual-listing.
When NOT to flip
You're pre-Series A with no US lead in sight, your team and customers are UK-centric, or you have material EMI options that would lose qualifying status. The compliance overhead and double-jurisdiction tax filings rarely make sense below Series A.
Mechanics
A new Delaware Inc is incorporated, then existing UK shareholders exchange their UK shares for Delaware shares pro-rata via a share-for-share exchange. HMRC clearance under TCGA s.135/s.138 is critical to defer UK CGT. Typical timeline is 8–14 weeks if everything is clean.
Cost
- US legal: $40k–$80k for a clean flip, more if there are convertible notes or SAFEs to roll.
- UK legal and tax: £25k–£45k including HMRC clearance.
- 409A valuation for the new Delaware parent: $5k–$10k.
- Annual ongoing compliance overhead: roughly $25k per year of additional accounting, audit, and filing work.
EMI options after the flip
EMI options can usually be rolled into equivalent US options under TCGA s.135/s.136 if structured carefully — but the new options are no longer EMI-qualifying for HMRC purposes. This is the single biggest hidden cost of a flip and the one founders most often discover too late.
How we help
CloudFin Labs runs the financial workstream of a flip alongside your US and UK counsel: cap table modelling, 409A coordination, employee communications, and post-flip month-end close redesign. Most flips we run land inside ten weeks.