Germany's "fat years" of higher-than-expected revenue from tax receipts are over, Finance Minister Olaf Scholz warned on Sunday, signaling that Europe's top economy is set to lose momentum in the next few years.

"The good times in which the state kept taking in more taxes than expected are coming to an end," Scholz told the Bild am Sonntag newspaper. That, he said, restricted the government's capacity for passing new tax cuts or increasing public investment.

Germany was, however, expected to post another budget surplus in 2018, Scholz said, after it posted a €36.6 billion ($41.7 billion) surplus in 2017.

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Read more: Germany's boom and Europe's problems

The German government has spent less than it has received in tax revenues in every fiscal year since 2014 as a result of strong economic growth, high wages and record-low unemployment.

Scholz, a Social Democrat (SPD), cited the predicted fall in tax revenue as a reason for why he opposed abolishing the "Solidarity Surcharge," a controversial tax designed to help finance development projects in eastern states that were part of communist East Germany.

The SPD's coalition partners, the conservative Christian Democratic Union (CDU) and its Bavarian sister party, the Christian Social Union (CSU), have called for ending the surcharge by 2021.

Economic contraction in 2018

Germany's economic outlook appears fragile after the economy contracted for the first time in more than three years in the third quarter of 2018. In response, the government cut its growth forecast for 2018 to 1.5-1.6 percent, down from the 2.2 percent expansion registered for 2017.

Ongoing trade tensions between the United States and China, problems in the German car industry and uncertainty about the United Kingdom's planned exit from the European Union have all contributed to the slow down.

Scholz, who succeeded veteran CDU finance chief Wolfgang Schäuble in early 2018, has vowed to uphold his predecessor's "black zero" policy of maintaining a balanced federal budget.

That policy has angered Germany's European peers and some international organizations, which have called on Berlin to increase public investment to help rectify the country's massive trade surplus with the rest of the world.

jcg/amp (AFP, dpa)Each evening at 1830 UTC, DW's editors send out a selection of the day's hard news and quality feature journalism. You can sign up to receive it directly here.