Question:
If you find money in the street, do you need to take masser from it. Please cite source
Answer:
Hello,
A person who finds money that he is halachically allowed to keep should take maaser from it, as it is no different from other income that he makes. If you want sources for it see sefer hayira of Rabbeinu Yona D:H val timna, and sefer yosef Ometz Perek Hatzedakah V’hamaaser.
Best wishes
