If a company receives State Aid within the meaning of Article 2 of Commission Regulations (EC) No 1998/2006 such as grants, then these can reduce the amount of SEIS investment that can be claimed.
The amount of all SEIS investment, together with any other de minimis State aid received by the company in the 3 years to the date of the latest SEIS investment, must not exceed £150,000.
For example, a company receives a grant of £30,000 and this is considered by the EU regulations as de minimis aid, then the SEIS investment available is £120,000.
If the grant/fund documentation doesn’t specify whether its de minimis aid, the company should check with the provider or administrator of the grant/fun