India Tax Series
India’s New Income Tax Act 2025: What the Structural Overhaul Means for Business Owners Who Also File GST
June 2026 | 14 min read | India Tax | GST
The Warm-Up: Two Laws, One Business, Zero Margin for Error
India’s tax system just ran a 60-year overhaul in one legislative session. The Income Tax Act 2025 [the new law that replaces the old Income Tax Act 1961, governing how income tax is calculated and collected in India] received presidential assent in August 2025 and came into force on 1 April 2026. Over 800 sections have been restructured into 536. Centuries of legal language have been simplified. The dual-year labelling system that confused every first-time taxpayer has been eliminated.
For a salaried employee, this is mostly a terminology exercise. For a business owner who simultaneously files GST [Goods and Services Tax — the single indirect tax applied on the sale of goods and services in India, replacing a patchwork of older taxes like VAT and service tax] returns, runs ITR-4 [the income tax return form designed for small business owners, traders, and freelancers who use the simplified presumptive tax scheme instead of maintaining full accounts] on the presumptive scheme [a simplified income tax option where instead of calculating your exact profit, the government lets you declare a fixed percentage of your turnover as profit — no detailed books required], employs staff subject to TDS [Tax Deducted at Source — where tax is cut from a payment before it reaches you, so the government collects it upfront rather than waiting for your annual return], and procures goods under reverse charge [a GST rule where the buyer, not the seller, is responsible for paying the GST directly to the government — common in services like legal fees or goods from unregistered suppliers], this is a structural event with live compliance implications right now.
Think of the old system as a cricket team that trained for decades under a single head coach but with no written playbook. Everyone improvised based on experience. The new Act is the written playbook. The coach has not changed. The rules of the game have not changed. But the documentation, the language, and the cross-referencing system has been rebuilt from scratch. If you keep playing from memory without reading the new document, you will miss a delivery that you did not see coming.
This post breaks down the changes that matter specifically to business owners operating under both the Income Tax Act 2025 and the GST framework simultaneously.
The Income Tax Act 2025 governs direct tax [tax paid directly by you on your own income — income tax is a direct tax]. The CGST Act 2017 [Central Goods and Services Tax Act — the central government law that governs how GST works in India] governs indirect tax [tax collected by sellers from buyers and passed on to the government — GST is an indirect tax because the business collects it on behalf of the government], meaning GST on the supply of goods and services. These are separate laws administered by separate authorities. Changes to one do not automatically change the other. However, because both laws use turnover [your total annual sales or receipts from business, before any deductions] as a key threshold and both sets of returns are now cross-matched by the department using data analytics, they interact with each other in practice in ways that most business owners do not anticipate.
Section 1: The Tax Year — Why One Terminology Change Matters More Than You Think
Under the Income Tax Act 1961, India used a dual-year reference system. Income earned in Financial Year [FY — the 12-month period from 1 April to 31 March in which you earn income and run your business] 2025-26 was assessed in Assessment Year [AY — the year following the Financial Year, in which the income tax department formally examines and assesses your income. So income earned in FY 2025-26 was assessed in AY 2026-27] 2026-27. Every ITR [Income Tax Return — the annual form you file with the income tax department declaring your income, deductions, and tax paid] form, notice, and demand order referred to the year after the one in which income was earned. This caused systemic confusion. First-time filers regularly selected the wrong assessment year on the portal, triggering defective return notices.
The Income Tax Act 2025 eliminates this entirely. From Tax Year [the new single-year reference introduced by the Income Tax Act 2025, replacing both Financial Year and Assessment Year. Income earned in Tax Year 2026-27 means April 2026 to March 2027 — both earning and assessment now carry the same label] 2026-27 onwards, there is only one year. Income earned in the 12-month period from 1 April 2026 to 31 March 2027 is declared and assessed as Tax Year 2026-27. The year of earning and the year of filing reference are the same.
2026 Effective date of the Income Tax Act 2025
What This Means for GST-Registered Business Owners
The GST financial year runs April to March and has never changed. GSTR-9 [the GST Annual Return — a yearly summary return that every regular GST-registered business must file, consolidating all sales, purchases, tax collected, and tax paid for the full year] is filed for the same April-March period. Under the old income tax system, the same April-March period was called Financial Year for GST purposes and Previous Year for income tax purposes, and then Assessment Year in the filing that followed. Three labels for the same window of time.
This mismatch created a practical problem during scrutiny [when the income tax department examines your return in detail, comparing it against other data sources to check for inconsistencies]. When the department cross-matched GSTR-9 turnover with ITR declared turnover, the document headers referred to different year labels for the same accounting period. A business owner filing without professional help regularly filed forms with mismatched year references, triggering automated notices.
From Tax Year 2026-27 onwards, the ITR header and the GSTR-9 header will both refer to the same year in the same language. This is a genuine improvement for the business owner who manages their own filings.
For income earned between 1 April 2025 and 31 March 2026, the old Act provisions still apply. You are filing ITR for AY 2026-27 under the 1961 Act. The Tax Year concept applies only from 1 April 2026 onwards. Do not apply the new terminology to any return or notice that relates to income earned before that date.
Section 2: Section 58 — The New Presumptive Taxation Framework
This is the structural change with the most direct commercial impact on small and mid-size business owners.
Under the Income Tax Act 1961, presumptive taxation for businesses was spread across three separate sections. Each had its own eligibility rules, turnover thresholds, computation methods, and lock-in conditions [rules that require you to stay in the presumptive scheme for a minimum number of years — under the old law, if you opted out early, you were barred from re-entering for five years]. Cross-referencing between them was complicated and error-prone.
The Income Tax Act 2025 consolidates all three into a single Section 58 [the new single section in the Income Tax Act 2025 that covers all presumptive taxation — for businesses, professionals, and transport operators — replacing the old Sections 44AD, 44ADA, and 44AE]. The framework is now table-based and codified. The core logic, the percentage rates, and the threshold figures remain largely the same. What has changed is the structural architecture and one important clarification on the actual versus deemed profit [a fixed percentage of your turnover that the government treats as your profit for tax purposes, without requiring you to prove actual expenses or maintain detailed books] rule.
The Turnover Thresholds Under Section 58
| Category | Standard Threshold | Enhanced Threshold (if cash receipts <5% of total) | Deemed Profit Rate |
|---|---|---|---|
| Eligible Business (individuals, Hindu Undivided Families [HUF — a legal entity unique to India where a family jointly owns property and income; it files its own tax return separately from individual members], and partnership firms — LLPs [Limited Liability Partnerships — a business structure where partners have limited personal liability; excluded from the presumptive scheme under Section 58] excluded) |
Rs 2 crore | Rs 3 crore | 8% of turnover (cash receipts); 6% (digital receipts) |
| Specified Professions (doctors, lawyers, architects, engineers, accountants, and similar licensed professionals) |
Rs 50 lakh | Rs 75 lakh | 50% of gross receipts |
| Transport Operators | Per-vehicle computation | Per-vehicle computation | Per vehicle weight-based rates |
The Critical Clarification: Actual vs Deemed Profit
Under the old law, a long-standing ambiguity existed. If your actual profit was higher than the deemed percentage of turnover, were you required to declare the actual profit or could you declare the lower deemed figure? The Income Tax Act 2025 resolves this under Section 58 with explicit language: you must declare 6 percent or 8 percent of turnover, or actual profit, whichever is higher.
This matters directly to business owners who have been using the presumptive scheme as a profit-capping tool rather than a simplification tool. A trader with Rs 1.8 crore turnover and Rs 40 lakh actual profit cannot declare Rs 10.8 lakh (6 percent) under Section 58. The actual profit of Rs 40 lakh is higher, and that is what must be declared. The section is now an explicit legal requirement, not an area of interpretive flexibility.
This is the equivalent of a marathon course that previously allowed runners to take an unofficial shortcut on a congested stretch. The race organisers have now placed marshals at that point. The route is the same. The distance is the same. But the shortcut has been closed. Those who trained honestly are unaffected. Those who built their race strategy around the shortcut need to recalibrate now, not on race day.
Section 3: Where Income Tax Thresholds and GST Thresholds Intersect — and Diverge
This is the section that most mainstream tax content completely misses. The Income Tax Act 2025 and the CGST Act 2017 both use the word turnover as a threshold trigger, but they define it differently and use it for entirely different compliance purposes. A business owner operating near any of these thresholds needs to understand both simultaneously.
The Four Turnover Lines Every Business Owner Should Know
| Threshold | Amount | Law | Consequence of Crossing |
|---|---|---|---|
| GST Registration (goods, most states) | Rs 40 lakh aggregate turnover [your total annual sales across all business activities and all states, added together under your single PAN number — includes taxable sales, exempt sales, and exports] | CGST Act 2017 | Mandatory GST registration required. You must start filing GSTR-1 [a monthly or quarterly return where you list every sale you made, so the government knows how much GST your customers owe credit for] and GSTR-3B [a monthly summary return where you calculate your net GST dues and make the payment to the government] |
| GST Composition Scheme exit | Rs 1.5 crore aggregate turnover | CGST Act 2017 | You must exit the Composition Scheme [a simplified GST option for small businesses that lets you pay a flat low rate — 1% for traders, 5% for restaurants — instead of standard GST rates, in exchange for not being able to collect GST from customers or claim input tax credit on purchases] and move to regular GST registration, which means you can now charge GST on your sales, claim input tax credit on purchases, and file full monthly returns |
| Presumptive Tax exit (IT Act 2025) | Rs 2 crore / Rs 3 crore (if <5% cash) | Income Tax Act 2025, Section 58 | Cannot use presumptive scheme; must maintain full books of accounts and a tax audit [a formal review of your financial accounts by an independent chartered accountant, certifying that your income and expenses are correctly recorded] may apply |
| Tax Audit trigger | Rs 1 crore turnover (regular), extended to Rs 10 crore if less than 5% of transactions are in cash | Income Tax Act 2025 | Mandatory tax audit required — an independent review of your accounts by a chartered accountant — before you can file your income tax return |
The Mismatch Problem: GST Aggregate Turnover vs Income Tax Turnover
Under GST, your aggregate turnover includes both taxable sales [sales on which GST is charged to your customer at the applicable rate] and exempt sales [sales of goods or services that are legally not subject to GST — for example, fresh unprocessed food, healthcare services, and basic educational services]. It also includes export sales and sales made in other states, all added up across every GST registration you hold under the same PAN [Permanent Account Number — a unique 10-character identifier issued by the income tax department that links all your financial and tax activity across India]. Under the Income Tax Act, turnover for presumptive purposes refers only to income from the specific eligible business activity. Certain receipts counted under GST aggregate turnover may be excluded from your income tax turnover calculation.
A real-world example: a trader sells both taxable goods at 18 percent GST and exempt goods like rice. For GST, both categories count toward aggregate turnover. For income tax, both categories also count toward business turnover. So far, the two figures align. But if the same trader earns interest income on a trade deposit — say a fixed deposit maintained with a supplier as security — that interest is taxable as income under income tax, but it does not factor into the GST goods-supply threshold. Result: the two turnover figures diverge by the interest amount, and the automated cross-matching system will notice.
When the tax department’s data analytics system compares your GSTR-9 against your ITR and finds a gap in the turnover figures, it generates an automated notice. The gap is legitimate and explainable, but only if you have documented it correctly and understand which provision creates it. A business owner who has simply been declaring whatever their accountant entered without understanding the numbers is completely unprepared for this situation.
Cross-matching of GST data with income tax data is not a future development. It is live right now. The GSTN [GST Network — the government-owned technology platform that processes and stores all GST filings across India] was integrated with the government’s financial intelligence framework in July 2023. This means the income tax department has real-time access to your GST filing data. If your GST annual return and your income tax return tell inconsistent stories about the same business, the system will flag it. Your job is to ensure every difference between the two figures is documented, explained, and defensible before any question is asked.
Section 4: Input Tax Credit — The Income Tax Scheme You Choose Has No Effect on This
One of the most common questions from business owners is this: if you opt for the presumptive taxation scheme under Section 58 and declare deemed profit rather than maintaining detailed books of accounts, does that affect your ability to claim input tax credit under GST?
The answer is no. These are entirely separate legal frameworks administered by separate authorities. Input Tax Credit (ITC) [the mechanism under GST that allows a business to reduce its GST payment by the amount of GST it has already paid on its own purchases. For example, if you paid Rs 18,000 as GST when buying raw materials, you can offset that against the GST you collect from your customers, and only pay the difference to the government] is governed entirely by GST law. Your eligibility to claim this credit depends on whether you are a regular GST registrant, whether the purchase is for business use, and whether the GST paid on that purchase reflects in your GSTR-2B [a system-generated monthly statement that shows all the input tax credit available to you, based on what your suppliers have reported in their own GST returns — you cannot claim credit that does not appear here]. None of these conditions have anything to do with how you file your income tax return.
What does interact with your income tax choice, however, is the GST Composition Scheme [explained above in the thresholds table — a simplified flat-rate GST option for small businesses that completely bars input tax credit, regardless of income tax method]. If you are registered under the Composition Scheme, you cannot claim ITC regardless of how you file your income tax return. This is a GST rule, not an income tax rule.
| Business Owner Category | Income Tax Method | GST ITC Eligibility |
|---|---|---|
| Regular GST registrant, turnover < Rs 2 crore | Presumptive (Section 58, IT Act 2025) | Yes, ITC available on eligible purchases |
| Regular GST registrant, turnover > Rs 2 crore | Regular books, Section 62 | Yes, ITC available on eligible purchases |
| GST Composition Scheme registrant | Any income tax method | No ITC available under any circumstance |
| Below GST registration threshold, unregistered | Presumptive (Section 58, IT Act 2025) | Cannot claim ITC (not registered under GST) |
Section 5: The New Regime vs Old Regime Decision — What It Actually Affects for a Business Owner
The new tax regime [a simplified income tax option introduced in 2020 and made the default from 2023 onwards, offering lower tax rates in exchange for giving up most deductions and exemptions — the idea is lower rates, less paperwork, fewer tax-planning decisions] offers lower slab rates [the income tax system divides income into bands or slabs, each taxed at a different rate — the more you earn, the higher the rate on the income in that band] in exchange for giving up most deductions [amounts you are allowed to subtract from your total income before calculating the tax you owe, reducing your tax bill — for example, investing Rs 1.5 lakh in a PPF account lets you deduct that amount from your taxable income under Section 80C] and exemptions. The old regime [the original income tax system under the 1961 Act, which allowed a wide range of deductions and exemptions in exchange for higher base rates — still available as an option but no longer the default] retains the full range of these deductions, including 80C investments, home loan interest deductions, HRA [House Rent Allowance — a tax exemption available to salaried employees who pay rent, allowing them to exclude a portion of their rent from taxable income], and LTA [Leave Travel Allowance — a tax exemption for travel costs incurred during leave, available to salaried employees].
For a salaried employee, this is a straightforward optimisation exercise. For a business owner who also has GST obligations, the regime choice has downstream effects that are less obvious.
The New Tax Regime Slabs (Applicable from Tax Year 2025-26 and Continuing for 2026-27)
| Income Slab | New Regime Rate |
|---|---|
| Up to Rs 4 lakh | Nil |
| Rs 4 lakh to Rs 8 lakh | 5% |
| Rs 8 lakh to Rs 12 lakh | 10% |
| Rs 12 lakh to Rs 16 lakh | 15% |
| Rs 16 lakh to Rs 20 lakh | 20% |
| Rs 20 lakh to Rs 24 lakh | 25% |
| Above Rs 24 lakh | 30% |
Note: A tax rebate [a full reduction of your tax bill to zero — different from a deduction, which reduces income before tax is calculated; a rebate wipes out the tax itself] under the new regime effectively makes income up to Rs 12 lakh tax-free for most individuals. For salaried employees, a flat standard deduction [a flat Rs 75,000 deduction from salary income available to all salaried taxpayers under the new regime, no receipts or proof required] of Rs 75,000 extends this zero-tax ceiling to Rs 12.75 lakh. Business income does not get this standard deduction under the new regime.
The Working Capital Interaction
A sole proprietor or small business owner who opts for the new regime gives up deductions on business-related expenses that sit under the old regime exemption categories. More importantly, they give up deductions on investments that function as working capital management tools, such as certain deposits and instruments that previously reduced taxable income while maintaining liquidity.
If that same business owner has GST obligations, their monthly GST outflow is not deductible under either regime because GST is a pass-through tax [GST collected from your customers is not your income — you collect it on behalf of the government and pass it on. It sits in a separate liability, not in your profit and loss]. But the cash flow timing matters: GST liability is payable by the 20th of the following month. Advance tax [income tax paid in instalments during the year itself, before your return is filed — required if your annual tax liability exceeds Rs 10,000; paid in four tranches in June, September, December, and March] is payable quarterly. A business owner managing both payment schedules needs to model their monthly cash flow more precisely than before.
Section 6: The Audit Trigger — When Section 58 and GST Together Create a Risk Exposure
The tax audit threshold under the Income Tax Act 2025 is Rs 1 crore in regular business turnover. This extends to Rs 10 crore where cash receipts and payments both remain below 5 percent of respective totals. Businesses opting for Section 58 presumptive taxation and declaring the deemed profit rate are generally exempt from audit, but only if they remain within the turnover threshold and declare income at or above the deemed rate.
The risk scenario that is now playing out regularly is this: a business owner files their GSTR-9 showing Rs 2.8 crore in total turnover for the year. The same business owner files their ITR-4 under the presumptive scheme, declaring turnover of Rs 1.9 crore and deemed profit of Rs 11.4 lakh (6 percent).
The Rs 90 lakh gap between the two figures may be entirely legitimate. It may represent exempt sales that are included in the GST turnover count but fall outside the business income calculation under Section 58. However, the automated system does not know that. It generates a notice. The business owner who cannot explain the gap with documentation is now in a time-consuming scrutiny process that could have been entirely avoided with correct initial filing.
This is not a hypothetical. These notices are being issued. The volume of cross-match scrutiny cases has increased materially since the GSTN data integration was activated.
Section 7: The Business Owner’s Compliance Playbook for Tax Year 2026-27
- Compare your GST annual return figures with your income tax return figures before filing either Your GSTR-9 and your ITR both report your annual turnover for the same business. They will almost always show different numbers because the two laws count turnover differently. Before you file either, sit down with both figures and write out exactly why they differ. Exempt sales, interest income, and export sales are the most common sources of difference. This written explanation must exist in your records before the returns are filed — not after a notice arrives.
- Check your Section 58 eligibility against the actual vs deemed profit rule Pull your actual profit figure before deciding to file under the presumptive scheme. If actual profit exceeds 8 percent of cash turnover or 6 percent of digital turnover, you must declare the actual figure. Filing the deemed rate when actual profit is higher is now an explicit violation under the 2025 Act, not an ambiguity.
- Verify that your digital receipts percentage is accurately calculated before claiming the enhanced Rs 3 crore threshold The enhanced threshold applies only where cash receipts do not exceed 5 percent of total turnover. Non-account payee cheques [cheques that are not crossed and marked with the payee’s name — they can be transferred to anyone and are treated as equivalent to cash by the income tax department for this purpose] are treated as cash under Section 58. If you are near the standard threshold and relying on the enhanced limit, calculate this percentage from your bank statements before filing. A miscalculation here pushes you out of Section 58 eligibility entirely.
- Model your new regime vs old regime decision against your GST cash flow schedule Do not make the regime decision based on income tax liability alone. Map your monthly GST outflow, your quarterly advance tax schedule, and your annual working capital cycle together. The optimal direct tax position may not be the optimal cash flow position for a business with significant monthly GST obligations.
- Make sure the person filing your income tax return has seen your GST annual return first The most common source of turnover mismatches is the income tax return being prepared without sight of the GSTR-9. Whether you prepare your own returns or use a tax professional, the two returns must be prepared with full visibility of each other. The person preparing your ITR must know your GST turnover figure before they start, and the person preparing your GSTR-9 must know your income tax declared turnover. If different people handle each, they need to be looking at the same numbers before either file is submitted.
Frequently Asked Questions
Does the Income Tax Act 2025 change GST registration thresholds?
No. GST registration thresholds are governed by the CGST Act 2017 and remain at Rs 40 lakh for goods and Rs 20 lakh for services in most states. The Income Tax Act 2025 is a direct tax law and does not alter any GST threshold.
What is the presumptive taxation turnover limit under Section 58 of the Income Tax Act 2025?
For eligible businesses, the threshold is Rs 2 crore, extended to Rs 3 crore if cash receipts do not exceed 5 percent of total turnover. For specified professionals, the threshold is Rs 50 lakh, extended to Rs 75 lakh under the same condition.
What does the new Tax Year concept mean for a GST-registered business?
The Tax Year replaces both Previous Year and Assessment Year for income tax purposes. For GST-registered businesses, the financial year for GSTR filings remains unchanged at April to March. The change affects income tax terminology only. From Tax Year 2026-27 onwards, ITR forms, notices, and assessments will use Tax Year instead of Assessment Year, eliminating the year-label mismatch between GST and income tax documents for the same accounting period.
Can a business owner claim GST input tax credit if they opt for the presumptive taxation scheme?
Yes. Choosing the presumptive taxation scheme under Section 58 is purely an income tax decision. It has no effect on your GST input tax credit eligibility. ITC — your ability to offset the GST you paid on purchases against the GST you collect on sales — is governed entirely by GST law. The one exception is if you are registered under the GST Composition Scheme, which bars ITC regardless of your income tax method. If you are a regular GST registrant, your ITC eligibility is unaffected.
What happens if my GSTR-9 turnover and my ITR declared turnover do not match?
A mismatch between your GST annual return and your income tax return turnover is one of the most common triggers for automated scrutiny notices. The department’s system cross-matches both figures. The difference is often legitimate — for example, exempt sales counted in GST turnover but not in income tax turnover — but you must be able to explain and document every rupee of difference before any notice arrives, not after.
The Final Lap: Two Laws, One Filing Window, One Preparation
The Income Tax Act 2025 is not a disruption for most business owners. Tax rates are unchanged. The fundamental logic of how income is computed is unchanged. The presumptive scheme thresholds and rates are largely unchanged. What has changed is the precision of the framework, the codification of rules that were previously ambiguous, and the enforcement infrastructure that cross-references your direct tax and indirect tax data simultaneously.
An elite athlete does not treat the strength gym and the track as separate disciplines. The power built in the gym shows up in the speed on the track. The endurance developed on the road shows up in the recovery after a heavy training block. Everything feeds everything else.
Your GST returns and your income tax returns are not two separate filing exercises. They are two reports about the same business, filed under two different laws, and now read together by the same authority. The business owner who treats them as one integrated compliance obligation, managed from the same data and prepared with full cross-visibility, is the one who does not get surprised by the starting pistol.
Continue Reading: The Tax Athlete Series
Sources and Verifications
Income Tax Department, Government of India: Official text of the Income Tax Act 2025, confirming Tax Year definition under Section 3 and transitional provisions. Available at incometax.gov.in.
Income Tax Department, ITR-4 (Sugam) FAQs: Confirmed turnover thresholds under Section 58 for eligible businesses (Rs 2 crore / Rs 3 crore) and specified professions (Rs 50 lakh / Rs 75 lakh). Available at incometax.gov.in.
Central Board of Indirect Taxes and Customs, CGST Act 2017: GST registration thresholds and Composition Scheme eligibility limits confirmed as unchanged for Tax Year 2026-27.
Finance Act 2025 and Union Budget 2026-27: New tax regime slab rates confirmed as applicable for Tax Year 2025-26 and unchanged for Tax Year 2026-27.