# Article 4 — Procedure for calculation **Commission Delegated Regulation (EU) 2017/592 · superseded — not in force · OJ L 87, 31.3.2017 · dated 1 Dec 2016 [no longer in force]** *No longer in force · Commission Delegated Regulation (EU) 2017/592, OJ L 87, 31.3.2017 · Checked against EUR-Lex on 26 Oct 2026 · [Official source](https://eur-lex.europa.eu/eli/reg_del/2017/592/oj/eng)* 1. The calculation of the size of the trading activities and capital referred to in Articles 2 and 3 shall be based on a simple average of the daily trading activities or estimated capital allocated to such trading activities, during three annual calculation periods that precede the date of calculation. The calculations shall be carried out annually in the first quarter of the calendar year that follows an annual calculation period. 1. For the purpose of paragraph 1, an annual calculation period means a period which starts on 1 January of a given year and ends on 31 December of that year. 1. For the purpose of paragraph 1, the calculation of the size of trading activities or estimated capital allocated to trading activities taking place in 2018 shall take into account the three preceding annual calculation periods, starting on 1 January 2015, 1 January 2016 and 1 January 2017, and the calculation taking place in 2019 shall take into account the three preceding annual calculation periods, starting on 1 January 2016, 1 January 2017 and 1 January 2018. 1. By derogation to paragraph 3, the reference period for the calculation of daily trading activities or estimated capital allocated to such trading activities shall comprise only the most recent annual calculation period when the following conditions are met: **(a)** daily trading activities or estimated capital allocated to such trading activities declines by more than 10 %, when comparing the earliest of the three preceding annual calculation periods with the most recent annual calculation period; and **(b)** daily trading activities or estimated capital allocated to such trading activities in the most recent of the three annual calculation periods is lower than in the two preceding calculation periods.