If you plan to submit i-DEPOTs on a regular basis, it may be advantageous to open a credit account via My BOIP.
There is a once-off fee of 209 euro to open a credit account. You can then purchase i-DEPOTs according to a graduated scale of fees. The more i-DEPOTs you submit, the lower the rate. More about current fees
A credit account can only be used for an i-DEPOT. You cannot pay for trademark or design filings by means of credits.