All out versus using all allotted overs
An innings can finish before all its allotted overs are used, or it can use the full allocation. Read the scorecard status to distinguish the two.
Look at wickets and status
An all-out innings has ended because the batting side cannot continue under the applicable rules. A team that reaches its allotted overs can finish with wickets still available. The same run total does not tell you which occurred.

Compare examples carefully
An illustrative 140 all out in 18.2 overs differs from 140/5 after 20 overs. Both show 140 runs, but the wickets and time used describe different innings. Do not treat the remaining overs as extra runs.
Read the chase separately
Once a chase reaches its target, the match can finish without using every over. Revised match conditions can also change the allocation. Use the official status and target rather than applying one formula to every final total.
A useful next step
Use the IPL guide to combine innings status with the score line.
Explore IPL score and fixture reading