Small Business Tax in India: The Complete 2026 Guide to Income Tax, GST, TDS and Advance Tax

India's income tax base has grown to 9.19 crore filers in FY 2024-25, and a large share of them are proprietors, professionals and small firms filing business returns (CBDT, 2025). India also has over 1.4 crore active GST registrations as of 2025 (GSTN/PIB, 2025). If you run a small business, the tax you actually owe depends on your structure, your turnover and the regime you pick. This guide covers every tax an Indian small business pays for FY 2025-26 (AY 2026-27), the presumptive schemes that cut your paperwork, the right ITR form, and the deadlines that carry penalties if you miss them.

What taxes does a small business pay in India?

An Indian small business can owe up to five separate taxes depending on its size and activity: income tax on business profits, Goods and Services Tax (GST), Tax Deducted at Source (TDS), advance tax, and state professional tax (Income Tax Act; CGST Act, 2017). Not every business pays all five - it depends on turnover, structure and whether you hire or pay vendors.

• Income tax on business profits: Levied on your net profit (revenue minus allowable expenses). The rate depends on your structure - individual slabs for proprietors, flat rates for firms, LLPs and companies.
• GST: Registration is mandatory once turnover crosses ₹40 lakh for goods (₹20 lakh for services; ₹20 lakh/₹10 lakh in special-category states). GST is collected from customers and remitted monthly or quarterly (CGST Act, 2017).
• TDS: If you pay salaries, rent above ₹2.4 lakh a year, contractor fees or professional fees, you must deduct tax at source and deposit it, then file quarterly TDS returns (Income Tax Act, Chapter XVII-B).
• Advance tax: If your total tax liability for the year exceeds ₹10,000, you must pay it in instalments during the year, not at filing time (Income Tax Act, s.208).
• Professional tax: A state-level tax (up to ₹2,500 a year) levied in states like Maharashtra, Karnataka, West Bengal and Tamil Nadu on businesses and employees.

The common mistake first-year owners make is treating GST as their money. It isn't. GST you collect is a pass-through liability owed to the government - only the income tax on your actual profit is your own cost. Keeping the two mentally separate from day one prevents cash-flow shocks at filing time.

How is tax different for proprietorship, partnership, LLP and Pvt Ltd?

Business structure decides your tax rate. A proprietorship's profit is taxed as the owner's personal income at individual slab rates; partnership firms and LLPs pay a flat 30% plus surcharge and cess; private limited companies pay 22% or 25% depending on the option chosen (Income Tax Act; Budget 2025). This single choice can change your effective rate by 10 percentage points or more.

For a proprietor, the advantage is simplicity: one PAN, one ITR, and the basic exemption limit of ₹4 lakh (new regime) applies before any tax is due. But once profits climb past roughly ₹15-20 lakh, the flat 22-25% company rate can beat the 30% top individual slab. That's why many growing small businesses eventually incorporate.

A key detail: firms and LLPs can deduct partners' remuneration and interest on capital before arriving at taxable profit, within limits set under Section 40(b). Budget 2024 raised the allowable remuneration limits, which helps small partnerships lower the firm-level tax burden legitimately.

What is presumptive taxation under Section 44AD?

Section 44AD lets a resident individual, HUF or partnership firm with business turnover up to ₹2 crore declare a deemed profit of 8% of turnover (6% for digital receipts) without maintaining audited books (Income Tax Act, s.44AD). It removes the biggest compliance burden for small traders and manufacturers - detailed accounting and tax audit.

• Turnover limit: Up to ₹2 crore. Budget 2023 extended this to ₹3 crore where cash receipts are 5% or less of turnover.
• Deemed profit: 8% of turnover received in cash; 6% of turnover received digitally (cheque, UPI, bank transfer, card).
• Who cannot use it: LLPs, companies, commission/brokerage agents, and businesses running agency work are excluded.
• Lock-in rule: Once you opt in, you should continue for 5 years. Exit early and you're barred from presumptive taxation for the next 5 years, and must maintain books plus get audited if income exceeds the exemption limit.

The trade-off is honesty about your real margin. If your business genuinely earns 20% net margin, declaring 6% under 44AD understates income and invites scrutiny; if you earn only 3%, you still pay tax on the deemed 6-8%. Presumptive taxation suits businesses whose real margins sit near or below the deemed rate, and who value the paperwork savings.

How does Section 44ADA work for professionals?

Section 44ADA lets specified professionals - doctors, lawyers, architects, engineers, accountants, consultants and technical professionals - with gross receipts up to ₹50 lakh declare 50% of receipts as taxable income, with no books or audit required (Income Tax Act, s.44ADA). Budget 2023 raised the limit to ₹75 lakh where cash receipts stay within 5% of turnover.

A freelance software consultant billing ₹40 lakh a year declares ₹20 lakh as income under 44ADA and pays tax on that, regardless of whether actual expenses were higher or lower. For most solo professionals with low overheads, this is a genuinely favourable deal - real costs rarely reach 50% of receipts, so the scheme often taxes less than actual profit would.

Which ITR form does a small business use?

A small business uses ITR-4 (Sugam) if it opts for presumptive taxation under Section 44AD, 44ADA or 44AE and total income is up to ₹50 lakh; otherwise it files ITR-3, which is for individuals and HUFs with income from a proprietary business or profession maintaining regular books (CBDT, 2025). Firms and LLPs use ITR-5, and companies use ITR-6.

Watch the ITR-4 eligibility limits closely. If you have capital gains (say you sold shares or property), own more than one house property, earn foreign income, or hold directorship in a company, you're pushed out of ITR-4 into ITR-3 even if your business uses presumptive taxation. Picking the wrong form triggers a defective return notice under Section 139(9), giving you just 15 days to correct it.

Is the new tax regime default for small business in FY 2025-26?

Yes. The new tax regime is the default for FY 2025-26 (AY 2026-27), and proprietors pay tax on business profit at these slab rates unless they actively opt for the old regime (Budget 2025). The new regime raised the basic exemption to ₹4 lakh and the Section 87A rebate now makes income up to ₹12 lakh effectively tax-free for individuals.

There's a catch for business owners choosing the old regime. A proprietor with business income who opts out of the new regime must file Form 10-IEA before the ITR due date, and can switch back to the new regime only once in their lifetime. Salaried individuals can switch freely every year, but business owners are locked in far more tightly - so the choice deserves real calculation, not a guess.

Note that these slabs apply only to proprietors and professionals whose profit is taxed as personal income. Firms, LLPs and companies ignore the slabs entirely and pay their flat rates from the first rupee of profit.

When is advance tax due and what are 234B/234C interest charges?

Advance tax is due in four instalments during FY 2025-26 for anyone whose total tax liability exceeds ₹10,000 in the year (Income Tax Act, s.208). Miss the instalments and you pay interest: 1% per month under Section 234C for deferred instalments, plus 1% per month under Section 234B if you've paid less than 90% of your tax by year-end.

Businesses under presumptive taxation (44AD/44ADA) get a concession: they pay their entire advance tax in a single instalment by 15 March 2026, instead of four (Income Tax Act, s.211). This is one of the quieter benefits of the presumptive scheme - it collapses four deadlines into one.

Section 234C penalises shortfall in any specific instalment, while Section 234B penalises overall underpayment across the year. Both run at 1% per month. For a business owing ₹3 lakh in tax, skipping advance tax entirely can add ₹15,000-₹20,000 in interest before you even file - a needless cost that careful quarterly estimates avoid.

What are the key ITR and audit deadlines for AY 2026-27?

For AY 2026-27, non-audit business returns are due 31 July 2026, while businesses requiring a tax audit must file by 31 October 2026, with the audit report itself due by 30 September 2026 (CBDT, 2025). Tax audit under Section 44AB applies once turnover crosses ₹1 crore, extended to ₹10 crore if at least 95% of receipts and payments are digital.

There's an important interaction between presumptive taxation and audit. If you opt out of Section 44AD after using it, or declare profit lower than the deemed 6-8% while your income exceeds the exemption limit, you're forced into a tax audit even below the ₹1 crore turnover mark. This trap catches owners who abandon presumptive taxation without understanding the consequences.

Missing the deadline carries a Section 234F late fee of ₹5,000 (₹1,000 if total income is under ₹5 lakh), plus loss of the right to carry forward business losses and unabsorbed depreciation from that year. For a loss-making early-stage business, that carry-forward is often more valuable than the fee.

What records must a small business keep?

A business not under presumptive taxation must maintain books of account under Section 44AA once income exceeds ₹1.2 lakh or turnover exceeds ₹10 lakh in any of the three preceding years, and must retain them for at least 6 years from the end of the assessment year (Income Tax Act, s.44AA; Rule 6F). GST records must be kept for 72 months from the annual return due date (CGST Act, 2017).

• Cash book and ledger: Daily record of receipts, payments, sales and purchases.
• Invoices and bills: Sales invoices issued and purchase bills received, including GST tax invoices with GSTIN.
• Bank statements: All business bank accounts, reconciled with your books.
• TDS records: Challans, deduction certificates (Form 16/16A) and quarterly return acknowledgements.
• Fixed asset register: For depreciation claims under Section 32.
• Payroll and professional tax records: Salary registers, PF/ESI challans where applicable.

Even presumptive-scheme businesses that are legally exempt from formal books should keep basic records - bank statements, invoices, and a turnover log. If the tax department queries your declared turnover under 44AD, you need evidence of the ₹2 crore figure. "Presumptive" removes the audit, not the need to prove your numbers if asked.

Frequently Asked Questions

Does a small business have to register for GST?

Only above the threshold. GST registration is mandatory once turnover crosses ₹40 lakh for goods or ₹20 lakh for services (₹20 lakh/₹10 lakh in special-category states), or immediately if you sell inter-state or through e-commerce platforms (CGST Act, 2017). Below the threshold, registration is voluntary. Many small businesses register anyway to claim input tax credit and to supply GST-registered customers who demand tax invoices.

Can a proprietor use both Section 44AD and the new tax regime?

Yes. Presumptive taxation and the tax regime are two separate choices. Section 44AD determines how your business profit is computed (6%/8% of turnover), while the regime determines the slab rates applied to that profit. A proprietor can declare income under 44AD, file ITR-4, and be taxed under the default new regime slabs - this is in fact the most common combination for small businesses in FY 2025-26.

Is GST separate from income tax for a business?

Completely separate. GST is an indirect tax on the supply of goods and services, collected from customers and paid to the government (CGST Act, 2017). Income tax is a direct tax on your net profit (Income Tax Act). A business can owe GST while making a loss, and pay income tax while collecting GST - the two are computed, filed and paid independently, on different portals and different schedules.

What is the tax audit turnover limit for FY 2025-26?

The Section 44AB tax audit threshold is ₹1 crore turnover for businesses, raised to ₹10 crore where at least 95% of both receipts and payments are made digitally (Income Tax Act, s.44AB). For professionals, the limit is ₹50 lakh in gross receipts. Businesses under presumptive taxation who declare profit below the deemed rate while exceeding the exemption limit also fall into mandatory audit.

Do I pay advance tax if I use presumptive taxation?

Yes, but only once. Businesses under Section 44AD or 44ADA pay 100% of their advance tax in a single instalment by 15 March 2026, rather than the four instalments applicable to regular taxpayers (Income Tax Act, s.211). If your total tax liability for the year exceeds ₹10,000, this single payment is mandatory; miss it and Section 234B/234C interest at 1% per month applies.

Getting small-business tax right for FY 2025-26 comes down to three decisions: your structure, whether presumptive taxation fits your margins, and which regime you elect. If you'd rather have those choices modelled against your actual numbers, a tax and compliance consultation can map the lowest-cost path in one sitting. For the deadline-by-deadline view, see our ITR filing deadlines guide for small businesses, and if the GST-versus-income-tax split still feels blurry, start with our GST vs income tax explainer before you file.