Sarkozy did not attend the sentencing of the court in Paris.
The court allowed him to serve his sentence at home, with an electronic surveillance bracelet.
Sarkozy has firmly denied that his 2012 election campaign for a second term was organized on a much larger scale than his successful 2007 presidential campaign, whose funding has not been called into question.
After several scandals, French law from 1990 strictly limited spending on political campaigns.
The trial took place less than three months after Sarkozy was convicted of corruption and trading in influence in another case. He appealed the verdict.
Sarkozy withdrew from active politics in 2017, and he still has a lot of influence behind the scenes, especially within the Republican Party ahead of next year’s presidential election.