Penalty and late fee for non audit

If you are not liabile to tax audit u/s 44B then you just need to file the ITR. Late fees u/s 234F will be applicable if you not a company or tax audit assessee.

If you are liable and not filing tax audit report u/s 44AB after filing the ITR then Section 276CC penal provisions will be applicable (Imprisonment and fines).

Section 271B is applicable when you do not get your accounts audited and fail to file 3CA3CD or 3CB3CD as the case may be eventhough you are liable under tax audit u/s 44AB.

Even if you file belated return then the section is not applicable.