Opt for presumptive scheme(44ad)

No issue in opting for sec. 44AD, provided eligible business & eligible assessee........ only issue is while opting out without 5 years of continuation.

No issues. You can opt for Persumptive taxation u/s 44AD. There will be issue only if you break the chain, that is you are filing u/s 44AD in AY 18-19 and if you go out of 44AD in AY 19-20 then you cannot opt for 44AD for next 5 FY's from AY 19-20.