"The principle which applies for the German government is: we entered together, we will leave together," she told the Bundestag.
Members of the Nato military alliance are to meet in Chicago on 20-21 May and Afghanistan will be on the agenda.
Merkel said that the summit will confirm “in a concrete way the timetable fixed in 2010 in Lisbon for a withdrawal by the end of 2014".
Despite widespread fears that Afghan forces will not be capable of maintaining security, Merkel insisted that “handing over responsibility is progressing as we planned”.
- There are 130,000 foreign troops in Afghanistan at the moment.
- Germany’s4,800-strong contingent is the third largest after the US and the UK.
- France’s 3,400-strong contingent is the fifth largest, Italy being the fourth.
- The US plans to keep about 20,000 troops in Afghanistan after the Nato withdrawal.
The proposal to withdraw French troops this year was one of Hollande's few high-profile foreign policy commitments during the election. Incumbent Nicolas Sarkozy had promised to bring them home in 2013.