Taxation of Business and Professional Income: A Detailed Analysis

Every business or professional in India has to grapple with one central question come tax season: how much of what you earned is actually taxable? The answer lies in a carefully structured set of rules under the Income Tax Act, 1961, specifically Sections 28 to 44DA, which govern the taxation of income under the head “Profits and Gains of Business or Profession” (PGBP). This isn’t just about applying a flat tax rate to your revenue. It involves computing net income after legitimate deductions, adjusting book profits to align with statutory requirements, and navigating specific disallowances if you fail to comply with the Act. Whether you run a small shop, a consultancy firm, or a cooperative society, understanding this framework directly affects how much tax you owe.

What counts as income under PGBP? 🔗

Section 28 of the Income Tax Act is the starting point. It defines what qualifies as taxable income under this head. The most obvious item is the profit from any business or profession you carried on during the previous year (the financial year in which income was earned). But the section goes beyond that. It also includes:

Compensation received on termination of a management contract with an Indian company; income earned by a trade or professional association from specific services rendered to its members; profits from the sale of import licences; cash assistance received by exporters under government schemes; customs or excise duty repaid as drawback; and the value of any benefit or perquisite – whether in cash or kind – arising from a business or profession. If you are a partner in a firm, any salary, bonus, commission, interest, or remuneration received from the firm is also taxable in your hands under this head.

One important but often overlooked item: if inventory (stock-in-trade) is converted into a capital asset, the fair market value of that inventory on the date of conversion is treated as business income and taxed accordingly.

How taxable income is computed: book profits vs. taxable income 🔗

A business’s profit as shown in its books of accounts (book profit) is often not the same as taxable income. The Income Tax Act requires you to arrive at taxable income by starting with book profit and then making specific adjustments – adding back expenses that are disallowed and deducting only those expenses the Act expressly permits.

Section 29 makes this framework explicit: income under PGBP must be computed strictly in accordance with Sections 30 to 43D. Unlike salary income (where a standard deduction applies) or house property income (where a fixed percentage deduction is given), PGBP is computed on actual revenues minus actual expenses – but only those expenses that pass the tests laid down by the Act.

This is why two businesses with identical revenues and expenses in their books may end up with different taxable incomes, depending on how well they comply with the Act’s conditions.

Allowable deductions: what you can legitimately claim 🔗

Sections 30 to 37 lay out a detailed list of expenses that are allowed as deductions. These fall into two broad categories: specifically enumerated deductions (Sections 30-36) and general deductions (Section 37).

Rent, repairs, and insurance (sections 30 and 31) 🔗

Section 30 allows a deduction for rent, rates, taxes, repairs, and insurance for any building used for business or professional purposes. A key condition: if the assessee occupies a rented building, the full rent is deductible. If the building is owned, only current repairs (not capital improvements) are allowed. The distinction between a current repair (restoring something to its original condition) and a capital improvement (adding new capability or value) matters greatly here. Similarly, under Section 31, current repairs and insurance premiums for plant, machinery, and furniture used in business are deductible – but again, only current repairs, not capital expenditure.

Depreciation (section 32) 🔗

Depreciation is one of the most significant deductions available. Under Section 32, an assessee can claim depreciation on tangible assets (buildings, machinery, plant, furniture) and intangible assets (patents, copyrights, trademarks, know-how) at prescribed rates. Three conditions must be satisfied: the assessee must own the asset, the asset must be used for business or profession, and such use must have occurred during the previous year. Depreciation is calculated on the written-down value (WDV) of a block of assets, not on individual assets.

An important note for businesses operating under the new tax regime under Section 115BAC: depreciation under Section 32 is not available if the assessee opts into that regime. This is a significant trade-off that businesses must factor into their tax planning.

Expenditure on scientific research (section 35) 🔗

India’s tax law actively incentivises investment in research and development. Section 35 permits deductions for expenditure on scientific research – a term that covers any activity aimed at extending knowledge in natural or applied science, including engineering, technology, and social sciences.

The deduction operates differently depending on the type of expenditure. Revenue expenditure (such as salaries to research staff or purchase of raw materials for research) incurred in the year is fully deductible. It can even be deducted for expenses incurred during the three years immediately before the business commenced, provided they relate to the business. Capital expenditure on scientific research is also fully deductible in the year it is incurred – but, critically, the assessee cannot separately claim depreciation on the same asset under Section 32. No double-dipping is allowed.

Where a company makes a contribution to an approved research association, university, college, or institution, a deduction of 1.5 times the amount contributed is available (subject to DSIR approval). This weighted deduction is designed to encourage businesses to fund external R&D even if they do not conduct in-house research.

If a scientific research asset is sold without having been used for any other purpose, the lower of the sale proceeds or the cost originally deducted under Section 35 is treated as business income in the year of sale. Any amount above the original cost is separately liable to capital gains tax.

General deductions (section 37) 🔗

Section 37(1) functions as a catch-all provision. Any expenditure not covered by Sections 30-36 is deductible, provided it was incurred wholly and exclusively for the purposes of business or profession, it is not a capital expenditure, it is not a personal expense, and it was incurred in the relevant previous year. Common examples include legal fees, advertising expenditure, interest on business loans (other than those already covered under Section 36), and salaries paid to employees.

Two important exclusions apply. First, any expenditure that constitutes an offence or is prohibited by law – such as a bribe, protection money, or a penalty for violation of any law – is expressly not deductible. Second, expenditure on Corporate Social Responsibility (CSR) activities under Section 135 of the Companies Act, 2013 is not allowed as a deduction, even though such spending may be legally mandated for larger companies.

Disallowances for non-compliance: sections 40, 40A, and 43B 🔗

Even if an expense is genuinely incurred for business, it may be disallowed if the assessee fails to comply with specific requirements of the Act. This is where the law creates real teeth – and where many businesses inadvertently increase their tax liability.

Section 40: TDS non-compliance 🔗

Section 40(a) disallows deductions for certain payments where Tax Deducted at Source (TDS) has not been deducted or not deposited with the government by the due date. For payments made to non-residents – such as royalties, fees for technical services, or interest – the entire expense is disallowed if TDS is not deducted. For payments to residents (interest, commission, brokerage, rent, professional fees, etc.), 30% of the expenditure is disallowed if TDS has not been deducted or has been deducted but not deposited. Disallowance under this section is not permanent – if the TDS is subsequently deposited, the deduction is allowed in the year of such deposit.

Section 40A: cash payment limits and related-party payments 🔗

Section 40A(3) disallows any expenditure where payment exceeding ₹10,000 to a single person in a single day is made in cash (the limit is ₹35,000 for payments to transporters). The law requires that such payments be routed through account-payee cheques, drafts, or electronic banking modes. If cash is used beyond the prescribed limit, the expense is completely disallowed, even if it was genuinely incurred for business. Exceptions exist under Rule 6DD for payments to government bodies, banks, producers of agricultural goods in villages not served by banking facilities, and a few other categories.

Section 40A(2) targets payments made to related parties – such as a director’s spouse, relatives, or associated concerns – where the expenditure is considered excessive or unreasonable having regard to the market rate for the same goods or services. The portion that exceeds fair market value is disallowed.

Section 43B: actual payment as a condition for deduction 🔗

Certain statutory dues – such as employees’ contributions to provident fund, ESI, gratuity fund, and similar welfare funds; employer’s contribution to such funds; taxes, duties, and cess – are only deductible on an actual payment basis, not on accrual. This means that even if an expense has been accounted for in the books during a financial year, the deduction is denied unless the payment is actually made on or before the due date for filing the income tax return. If the payment is made late, the deduction is shifted to the year in which payment is actually made.

The gap between book profit and taxable income: why it matters 🔗

The combined effect of allowable deductions and disallowances means that a business’s taxable income routinely differs from its book profit. A business that paid ₹15,000 in cash to a vendor has booked an expense but lost its deduction entirely. A firm that forgot to deduct TDS on professional fees paid to a consultant finds that 30% of that expense is added back to taxable income. Similarly, a company that charged depreciation at its own internal rate rather than the rate prescribed by the Income Tax Rules will find that its book profit and taxable income diverge accordingly.

This gap is not merely an accounting technicality. It has direct cash-flow consequences. Disallowed expenses increase taxable income, increasing the tax liability – sometimes significantly. For co-operative societies and small businesses with thin margins, a large disallowance can push a business into a higher effective tax rate than anticipated.

Maintaining proper records – receipts, invoices, TDS certificates, bank statements, and documentation for all scientific research approvals – is not optional. Accurate record-keeping is the only reliable defence against disallowances and the adverse adjustments that follow a tax audit.

Key compliance practices for businesses and professionals 🔗

For anyone earning income under the PGBP head, the following practices significantly reduce the risk of disallowances. Always route payments above ₹10,000 through banking channels – this single habit eliminates the risk of disallowance under Section 40A(3). Ensure TDS is deducted on every payment that triggers TDS liability, and deposit it before the due date; a single missed deposit can cost 30% of the entire expense as a disallowance. For scientific research expenditures, confirm that the research association or university receiving contributions is approved by the prescribed authority and that the deduction claim is supported with Form 3CK documentation. Finally, pay all statutory dues – provident fund contributions, ESI, gratuity fund contributions, and relevant taxes – before the income tax return filing due date to protect their deductibility under Section 43B.

The PGBP framework under the Income Tax Act ultimately operates on a straightforward principle: deductions are earned through compliance, not just through spending. Every allowable expense must satisfy the conditions the law lays down, and every prohibited payment or procedural lapse has a price in terms of higher taxable income.

What do you think? If a business records a legitimate expense in its books but fails to deduct TDS on the payment, should the entire expense be permanently disallowed – or is the current system of allowing deduction in the year TDS is eventually deposited a fair approach? And given how significantly book profits can diverge from taxable income, should businesses routinely prepare a tax computation alongside their financial statements to get a clearer picture of their actual tax liability?

References

1. https://indiankanoon.org/doc/555776/
2. https://cleartax.in/s/section-28-of-income-tax-act
3. https://incometaxmanagement.in/chargeability-scope-meaning-of-income-section-28-profits-and-gain-of-business-and-profession/
4. https://disytax.com/business-profession-income/
5. https://www.taxmann.com/post/blog/income-from-profits-and-gains-of-business-and-profession/
6. https://cleartax.in/s/section-35-of-income-tax-act
7. https://www.bajajfinserv.in/investments/section-35-of-income-tax-act
8. https://tax2win.in/guide/section-37-of-income-tax-act
9. https://www.indiafilings.com/learn/section-37-of-the-income-tax-act/
10. https://cleartax.in/s/section-40-of-income-tax-act
11. https://margcompusoft.com/m/section-40-a-ia-of-the-income-tax-act-1961/
12. https://paytm.com/blog/income-tax/section-40a3-income-tax-cash-payment-limit-exceptions-disallowance/
13. https://incometaxindia.gov.in/Tutorials/46.Disallowance%20of%20certain%20payments.pdf