Mida OS

SEIS Compliance · UK

Apply for SEIS compliance, the right way.

SEIS unlocks generous tax relief for your investors — but only if the compliance is done correctly. Mida OS manages the full SEIS compliance process for UK startups.

After your raise, we prepare and file the SEIS1 compliance statement with HMRC and issue SEIS3 certificates to your investors, so the relief they were promised actually lands.

One managed stack for your startup’s back office.

Mida OS handles legal, accounting, compliance and payroll for UK founders — one price, everything included. £350/month.