There is no specific investment level. 

The IPA may, however, pursuant to Section 28(7) of the Investment Promotion Act require an applicant for Certification to deposit the prescribed amount prior to a Certificate being issued.  The prescribed amounts are per Section 6B of the Investment Promotion Regulation

  (a) in the case of an individual – K50, 000.00
  (b) in the case of partnership – K50, 000.00 per partner
  (c) in the case of a corporate body – K100, 000.00.

However, the requirement is usually made a Condition of Certification to be complied with within six (6) months from the date of Certification.