"I filed my GST, so my taxes are done." We hear this more often than you would think. GST and income tax are two separate systems, with separate returns, separate deadlines and separate consequences.
The one-line difference
- GST is a tax on supply — on the value of goods and services you sell. You collect it from your customer and pass it to the government.
- Income tax is a tax on income — on the profit you actually earn after expenses.
Different returns, different calendars
- GST has monthly or quarterly returns (GSTR-1, GSTR-3B) plus an annual return.
- Income tax has advance tax instalments through the year and one return (ITR) after it ends.
- Being regular in one system says nothing about the other.
Where the two systems talk to each other
- Your GST turnover and your ITR turnover are matched by the department. Large unexplained gaps invite scrutiny.
- ITC claims affect your expense accounting, which affects taxable income.
A practical suggestion for small businesses
Treat compliance as one habit with two checklists, not two separate emergencies.
Keep one reconciled sales figure that flows into both your GST returns and your income tax computation. That single discipline removes most of the year-end stress we see in practice.