SEIS · Certificates

SEIS3 certificates for every backer.

Your SEIS investors need SEIS3 certificates to claim their 50% income tax relief. Mida OS prepares, validates and distributes these certificates so no investor is left waiting.

We extract investor details from your cap table, match them to HMRC’s requirements, and issue SEIS3 certificates with complete accuracy — so your backers can file their tax returns with confidence.

SEIS3 certificate drafting
Investor & cap table verification
HMRC SEIS1 statement alignment
Direct investor distribution
Amount & date accuracy checks
Complete record keeping

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.

Explore Mida OS tom@midacreek.com