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Tachinidae usually are much more bristly, yours is covered in soft hairs. This is a member of Syrphidae, and I bet it's genus Eristalis. To tell the many species apart a lot more details are needed, i.e. a good view of the wings (dark markings present? size of the pterostigma?), the antenna (how long are the hairs on the arista?) and the face (is there a black median stripe, and how broad?). One picture isn't enough, sorry.
Regards, Sundew