A GST return reports the tax your business collects on sales and remits to the government, filed monthly or quarterly with the GST authorities. An income tax return reports your total annual earnings to the Income Tax Department and is filed once a year. The two go to different agencies, follow different schedules, and measure different things, which is why most business owners in India end up filing both. Understanding the GST return vs income tax return distinction matters most when you cross a threshold that pulls you into one system without pulling you into the other.
What Each Return Actually Reports
Income tax is a direct tax on what you earn. Salary, business profits, rental income, investment gains, and interest all feed into your taxable income. You calculate what you owe and pay it from your own pocket. Rates rise with income through progressive slabs.
GST is an indirect tax on what gets bought and sold. When a business sells goods or provides services, it charges GST to the buyer as part of the price, then remits that collected tax to the government. The consumer bears the cost; the business is the collector. Because GST obligations are driven by sales volume rather than profit, a business running at a loss still files GST returns if it crossed the registration threshold.
Who Has to File Which One
Income Tax
Under the new tax regime for FY 2025–26 (AY 2026–27), which is now the default for individuals, the basic exemption limit is ₹4,00,000. If your gross total income exceeds that amount before deductions, you need to file an income tax return.1Income Tax Department. Salaried Individuals for AY 2026-27 Salaried employees with tax deducted at source often file even when their income falls below the threshold, to claim a refund or maintain clean financial records. Companies and firms file regardless of whether they turned a profit.
A rebate under Section 87A effectively means resident individuals with income up to ₹12 lakh (₹12,75,000 for salaried people after the ₹75,000 standard deduction) pay no income tax at all. The old regime remains available as an option and preserves deductions under Section 80C, Section 80D, and others; you choose between the two when you file.
GST
GST registration becomes mandatory when your aggregate turnover crosses ₹40 lakh for goods suppliers in most states, or ₹20 lakh for service providers. Special category states have lower thresholds: ₹20 lakh for goods and ₹10 lakh for services.
Put the two side by side and the gap becomes clear. A freelancer earning ₹15 lakh from consulting might have to file income tax returns but no GST returns. A trader doing ₹50 lakh in sales usually has to file both. Operating without GST registration when you’re required to have one triggers a penalty of ₹10,000 or the amount of tax evaded, whichever is higher.2CBIC-Tax Information. CGST Act 2017 Section 122
How Often You File
This is where the two systems diverge most sharply. Income tax is a once-a-year exercise. GST filing is a recurring monthly or quarterly obligation that never really stops.
Income Tax Deadlines
For individuals and businesses not requiring a tax audit, the income tax return for FY 2025–26 is due by July 31, 2026. Businesses that need an audit get until October 31, 2026, and those with international transfer pricing cases have until November 30, 2026. The tax audit report itself is due one month before the ITR deadline.3Income Tax Department. Income Tax Returns
Self-employed individuals and those without sufficient TDS coverage also pay advance tax in quarterly installments during the financial year (by June 15, September 15, December 15, and March 15), so payment obligations are not truly annual even though the return is.
GST Deadlines
GST-registered businesses with turnover above ₹5 crore file GSTR-1 (outward supplies) by the 11th of the following month and GSTR-3B (summary return with tax payment) by the 20th. Businesses with turnover up to ₹5 crore can opt for the QRMP scheme and file both returns quarterly instead: GSTR-1 by the 13th, and GSTR-3B by the 22nd or 24th of the month after the quarter, depending on the state.
On top of monthly or quarterly filings, every regular GST-registered taxpayer must file GSTR-9, the annual return, by December 31 of the following financial year.4GST Tutorial Portal. FAQs – About Form GSTR-9 Businesses under the Composition Scheme, available to those with turnover up to ₹1.5 crore for goods (₹50 lakh for service providers), file a simplified quarterly return in Form CMP-08 instead of GSTR-1 and GSTR-3B.5CBIC GST. Frequently Asked Questions on Composition Levy
What Goes Into Each Return
Income Tax Returns
The Income Tax Department prescribes different forms based on income type and amount. The most common is ITR-1 (Sahaj), available to resident individuals with total income up to ₹50 lakh from salary, one house property, and other sources like bank interest. You report gross income, claim applicable deductions, compute the tax, and subtract any TDS already deducted by your employer or bank.6Income Tax Department. File ITR-1 (Sahaj) Online User Manual
You’ll need your PAN, Form 16 from your employer if you’re salaried, bank statements, and details of any investments or insurance premiums if you’re claiming deductions under the old regime. Business owners and professionals use ITR-3 or ITR-4, which require profit and loss accounts and balance sheets. After submission, you must e-verify the return within 30 days for it to be legally valid.7Income Tax Department. How to e-Verify
GST Returns
GSTR-1 is essentially a detailed sales register. You report every invoice issued to registered buyers, along with summary data for sales to unregistered consumers. Your buyers rely on this data to claim their input tax credit, so accuracy matters. Errors in your GSTR-1 directly affect someone else’s tax position.
GSTR-3B is a self-assessed summary in which you declare total sales, GST collected, and the input tax credit you’re claiming on purchases. The difference between collected GST and claimed credit is what you actually pay. You’ll need your GSTIN (a 15-digit identification number that incorporates your state code and PAN), purchase invoices, and complete records of all sales for the period.
Input Tax Credit and Why GST Filing Depends on Your Suppliers
Input tax credit is the feature that makes GST fundamentally different from income tax. When you buy raw materials or services for your business, you pay GST on those purchases. When you sell your finished product or service, you collect GST from buyers. Input tax credit lets you offset the GST paid on purchases against the GST collected on sales, so you only remit the difference.
If you collected ₹450 in GST on your sales and paid ₹300 on your purchases, you deposit ₹150. The chain works because each seller’s GSTR-1 populates the buyer’s GSTR-2B, which shows how much credit is available to claim.
Mismatches cause real problems. If your supplier files GSTR-1 late or reports incorrect invoice details, the credit won’t appear in your GSTR-2B, and claiming it anyway in your GSTR-3B can trigger automated notices in Form DRC-01C. Failing to respond can block your own GSTR-1 filing for the next period and potentially lead to demand and recovery proceedings. Your GST compliance depends partly on your suppliers’ compliance, something income tax never requires you to worry about.
Penalties for Late Filing
Income Tax
Filing after the July 31 deadline triggers a late fee under Section 234F: ₹5,000 if your income exceeds ₹5 lakh, reduced to ₹1,000 if your income is ₹5 lakh or less. On top of the flat fee, Section 234A charges simple interest at 1% per month (or part of a month) on any unpaid tax from the due date until you actually file.
Criminal prosecution is reserved for deliberate evasion. If the amount you attempted to evade exceeds ₹1,00,000, you face imprisonment ranging from six months to seven years plus a fine. Below that threshold, the imprisonment range is three months to three years.8Indian Kanoon. Section 276C in The Income Tax Act, 1961
GST
Late GST filing carries a per-day fee. The statutory rate under Section 47 of the CGST Act is ₹100 per day, capped at ₹5,000.9CBIC-Tax Information. CGST Act 2017 Section 47 In practice, the government has reduced this through notifications to ₹50 per day (₹25 CGST plus ₹25 SGST) for returns with tax liability, and ₹20 per day for nil returns. Small amounts individually, but they compound quickly when you’re filing monthly. Missing three or four months of GSTR-3B filings can easily produce late fees of several thousand rupees before you’ve even addressed the actual tax owed.
More serious penalties under Section 122 apply to offences like operating without registration, issuing invoices without supplying goods, or filing fraudulent returns. The base penalty is ₹10,000 or the amount of tax involved, whichever is higher. For fraud or deliberate suppression, the penalty equals the full amount of tax due.2CBIC-Tax Information. CGST Act 2017 Section 122
If you’re handling both obligations, calendar reminders for the 11th, the 20th, and July 31 are what separate routine compliance from an escalating pile of late fees and interest.