Are there fees for deposits or withdrawals with the pillar 3a?

Deposits are always free of charge. 

Ordinary payouts such as drawing your 3a assets at retirement age or transferring to another 3a provider also cost you absolutely nothing. This includes the payout of assets to beneficiaries in the event of death. 

Extraordinary withdrawals, such as payouts for self-employment, owner-occupied property, or emigration, are charged according to the fee regulations.