GST and Income Tax Interaction Under ITA 2025: Turnover, TDS & Reconciliation

GST and Income Tax explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.

1. GST and Income Tax: Different Systems, Same Taxpayer

GST and income tax are two separate tax systems with different bases: GST is on consumption (transactions), income tax is on profits (income). However, they interact significantly for businesses — particularly around turnover definitions, deductibility of GST costs, and the risk of department comparing GSTR data with ITR data.

2. GST Collected is NOT Income

GST collected from customers is a liability — it belongs to the government, not to the business. It must NOT be included in business income. Business receipts for income tax = Gross receipts EXCLUDING GST collected. GSTR-1/GSTR-3B turnover includes GST; ITR turnover should EXCLUDE GST collected. Always maintain a reconciliation statement showing GST turnover vs net turnover.

3. GST Input Credit: Also NOT Income

GST input tax credit (ITC) is a reduction in GST liability — not income. ITC should not be included in income in the ITR. However, if ITC was claimed and later reversed (due to non-payment to vendor, blocked credits etc.), the reversal amount is NOT a deductible expense for income tax either.

4. GST Paid is Deductible Under Section 37

GST paid on business inputs (purchases, services) where ITC is NOT available (blocked credits — like GST on personal use assets, food, vehicles for personal use) is deductible as a business expense under Section 37. Similarly, GST paid on exempt supplies where ITC is reversed is deductible as a cost. GST where ITC is claimed is NOT deductible — you would be double-counting.

5. Section 44AD/44ADA Turnover: Excluding GST

The Rs 3 crore limit for Section 44AD and Rs 75 lakh limit for Section 44ADA are based on gross professional receipts EXCLUDING GST collected. So a consultant billing Rs 75 lakh + 18% GST = Rs 88.5 lakh total invoices — their Section 44ADA limit comparison is Rs 75 lakh (ex-GST), which is within the limit. This distinction is important for determining eligibility.

6. GSTR Vs ITR Mismatch: Department Notices

The IT Department compares GSTR-3B/GSTR-9 annual turnover with income declared in ITR. Significant differences generate notices. Common legitimate differences: GST turnover includes exempt supplies not in ITR income; GST includes branch transfers; timing differences. Always maintain a written reconciliation statement explaining the difference — this is the first document an AO will ask for.

7. Tax Audit Threshold: GST-Inclusive or Exclusive?

The Section 162 tax audit threshold (Rs 1 crore for non-digital, Rs 10 crore for 95%+ digital) is based on turnover excluding GST collected. This has been clarified by CBDT. So a trader with Rs 9.5 crore net turnover (ex-GST) but Rs 11 crore GST-inclusive billing does NOT cross the Rs 10 crore audit threshold.

8. Why TaxClue

GST-IT reconciliation is increasingly scrutinised. TaxClue maintains reconciliation statements and explains differences in ITR. Contact us for GST-IT compliance under ITA 2025.