Q 1: I calculate all my possessions, money and others, every year in the middle of each Ramadan to pay the annual Zakah (obligatory charity) - bearing in mind that
some of my income is from the rental of houses and some (Part No. 8; Page No. 343) other sources. This income is collected in different periods of the year until Ramadan and the last days of Shaban. Therefore, a Hawl (one lunar year calculated from the time a property reaches the minimum amount upon which Zakah is due) does not pass on most of the sources of my income.
However, I pay the Zakah (obligatory charity) due on them with exception of a small amount.
In sha’a-Allah (if Allah wills), what you are doing is permissible and discharges your obligation.