Break down your CTC into its different parts.
Basic salary is set as a percentage of CTC.
HRA is set as a percentage of basic.
PF and professional tax are deducted to arrive at take-home.
Basic: % of CTC
HRA: % of Basic
Take-home: Gross − employee deductions
Do all companies use the same salary structure?
No. The split between basic pay, HRA, and other allowances is different at every company. Change the percentages here to match your own offer letter, for an accurate breakdown.