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(1) Parties entitled to state funds must be granted installments on the amount established by the President of the German Bundestag. Such payments shall be calculated on the basis of the funds allocated to each party in the previous year. Installments shall be paid on 15 February, 15 May, 15 August, and 15 November; they must not exceed 25 percent of the total sum fixed for the party concerned for the preceding year. If there are signs that a party might be obliged to reimburse funds, the grant may be made dependent on a security deposit.
(2) Installments must be reimbursed by the parties immediately if they exceed the amount fixed or if a party has no entitlement to them. If the amount fixed shows that there was an over-payment, the President of the German Bundestag shall assess the amount that has to be reimbursed as part of the administrative act comprising the fixing and shall take this amount into account directly.
(3) Article 19a (6) shall apply mutatis mutandis.