German term (edited): Abrechnungszeitraeume

...is my first thought, "fiscal periods" or "invoice / invoicing periods" (?) my second and third.
:-)

German term (edited): Abrechnungszeitraeume

hth

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Note added at 24 mins (2005-04-06 21:46:01 GMT)
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I did not mention accounting period although it is listed in Eichborn as well, because:
http://www.investopedia.com/terms/a/accountingperiod.asp:
1. In general, the time period reflected by a set of financial statements.
2. In terms of taxation, it is the 12-month period a taxpayer uses to determine their income tax.

Billing period is the period after that a company pays its bills. E.g. they collect all invoices for a week and then pay all of them in a single batch job

you'd say in the US, but Abrechnungszeiträume sind abgerechnet is totally senseless. Why not show us the courtesy of a complete sentence?