another zakat question

Re: another zakat question

you have to fix a date for calculating zakat. Most people calculate zakat on 1st Ramadan. so, the amount in your account on 1st Ramadan (even there was a major fluctuation inflow / outflow in the account a day before Ramadan) is subject to zakat. Its not necessary that each single penny in your account had remained in your account for a year to be subjected to zakat.