How to Build a FinTech App in the UK — From Idea to FCA-Aware Launch (2025)

£35,000–£80,000 for a FinTech MVP. £80,000–£250,000+ for a full FCA-authorised platform. The largest cost drivers: FCA authorisation legal fees (£10,000–£50,000+), AML/KYC integration complexity, Open Banking API integration, and Consumer Duty UX testing. R&D Tax Credits may reduce effective development costs by up to 27%.

It depends on your regulated activities. Required for: AISP/PISP (payment services), e-money issuance, consumer credit, investment management, insurance distribution. Not required for: providing analytics tools to regulated firms, building technology for regulated clients, providing information-only services. The FCA Perimeter Guidance (PERG) is the authoritative reference.

FCA authorisation typically takes 6–12 months from application to approval. The FCA aims for 6 months but complex applications take longer. The FCA Regulatory Sandbox (for innovative firms) can provide temporary authorisation for testing. Start the authorisation process before you start building — you cannot operate without it.