Germany will collect taxes totalling €620.5bn in 2013 - an increase on its May forecast, which estimated tax revenues at €615.2bn.
In its revised figures, the German Finance Ministry expects to collect more tax in every year from 2013-2018, with the exception of 2015 and 2017.
German Finance Minister Wolfgang Schaeuble said in a statement that "fiscal leeway remains limited", despite the increased tax revenue estimates.
The country's tax revenue in 2012 was €600bn (£500bn, $803bn).
The German Government is looking to collect about €14bn more between 2013-2017 than had previously been predicted in May.