German newspaper Sueddeutsche Zeitung reported on Thursday German government expects nearly influx of 3.6 million refugees by 2020.
Meanwhile, calculations are only based on internal estimates by the economy ministry in coordination with other ministries, the newspaper added.
Germany, which has a population of around 80 million, has welcomed more refugees than any other European country. Almost 1.1 million refugees came in 2015 and officials are keen to ensure that the numbers are lower this year.
Also, the Interior Ministry of Germany reported on Feb, 4 that 91,671 people were registered as refugees in the country in January, compared with 127,320 who arrived in December.
In order to project economic development, the economy ministry created "an internal, purely technical estimate on migration in coordination with other government departments."
German chancellor Angela Merkel said in January that Germany expected Syrian and Iraqi refugees would return home after Syrian civil war is over and the DAESH terrorist group is defeated.
Because of the huge influx of refugees to Germany, several anti-refugee protests took place in the beginning of February in eastern Germany.
"How cold-hearted, how coward one has to be to plant oneself in front of a refugee bus, to swear and to roar in order to scare the people sitting inside, among them several women and children," government spokesman Steffen Seibert said about the protests.
Only in January 35,822 Syrians arrived in Germany - the largest group arriving in the country. Iraqis and Afghans followed them with more than 18,000 from each country as well as much smaller numbers of Iranians and Moroccans.