Just got a letter from my accountant, so I thought I'd to a quick translation for your enlightenment, as Ex-Pats with accounts here will be affected.
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Automatic collation of capital returns and speculation profits from 01.04.2004 onwards.
due to various changes in law, all credit institutes are compelled by law to maintain files of all accounts, with names of holders and access entitled persons, and to make thes available to the Bundesanstalt für Finanzdienstleistungsaufsicht (BaFin).
From 01.04.05 onwards, the taxation authorities also have the possibility to access these files and to assess at which credit institute any tax-payer holds accounts or depots, also backdated for previous years.
Further, the banks have to collate all capital returns and speculation profits in a new, legally required yearly statement. Which can also be examined by the tax authorities.
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Now what does this mean, apart from the obvious declaration of investments etc. which might not have been declared before?
It means they can directly see when and how much money goes into and out of an account held at a german bank. They can also see where the money came from or went to.
If you are resident here, you are supposed to declare all accounts, including foreign ones. However, bank secrecy rules meant they could not access your account particulars, unless you were under investigation and they got a court order to do this. So, if you didn't tell them about any other accounts, they were none the wiser.
Now they can just look and see, and if they see money coming from and/or going to accounts in the same name as the account holder, they will ask for "clarification".
I don't know how international the empowerment is, but I do know that the german tax authorities will converse with inland revenue and, as they just want our best (money that is), you can bet the inland revenue will be helpful (I know of cases from colleagues, where the tax authorities have been very helpful to each other, even before these changes). I also expect this regulation will be quite universal in Europe, to catch the money "floating" between various EU countries outside the tax system.