Building a corpus of over ₹1 lakh with an investment of ₹6,000 per month is achievable with systematic investment plan (SIP). At an annual return of 10%, a monthly SIP of ₹6,000 will take two years to become ₹1.6 lakh. Notably, ₹1 lakh target can be reached with a monthly SIP of ₹4,000 as well at same rate and time.