I'm a native speaker of Finnish ([ ]) but I can tell you that no comma is needed in your sentence. A comma is usually not used if a subordinate clause follows the main clause . I'll go there if he asks me.
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The independent clause of the sentence contains "not"; therefore, comma is used before "if".
For the sake of clarity, comma is used; however, if the sentence read alike (Please contact us if you have any problem), there is no need of using comma before "if".
AnonymousI would really appreacite it if someone could clarify whether there should be a comma before "if" in the sentence below:--->Please do not hesitate to contact us if you have any other questions.
I would really appreciate... There is no need for a comma.
Please do not hesitate to contact us if you have any other questions.
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