The report, which will be officially presented on Wednesday, also said that Germany's debt burden will probably fall to below 60 percent of gross domestic product (GDP) - in line with European Union rules.

It also said that Germany's fiscal policies must be geared to a normalisation of interest rates in the euro zone.

The public sector, which includes the federal government, regional states, municipalities and social funds, posted a record budget surplus of 38.4 billion euros (£33.8 billion) in 2017.

(Reporting by Gernot Heller; Writing by Joseph Nasr; Editing by Madeline Chambers)