Income Tax · Business & Profession Taxability · Updated August 2026

Income Tax for Diagnostic Centres & Pathology Labs in India 2026: ITR, Business Code, Presumptive Tax, GST & Expenses

Diagnostic businesses may be owned by medical professionals, companies, firms or entrepreneurs and can collect fees directly or through hospitals/aggregators. Sample collection, referral payments and outsourced tests need transparent accounting.

What counts as taxable receipts?

Start with the full commercial picture, not just the amount that finally reaches the bank after TDS, platform deductions, refunds or reimbursements. Typical receipts for this activity include:

• pathology test fees
• diagnostic/imaging receipts
• sample-collection charges
• corporate health-check packages
• hospital/aggregator settlement receipts

Whether a reimbursement is excluded from revenue depends on the contract and whether the taxpayer is acting as a pure agent or as principal. Keep customer invoices and settlement statements so gross receipts can be reconstructed.

Which ITR should be filed?

For an individual/HUF with income from the Diagnostic Centres & Pathology Labs activity computed under normal business/professional provisions, ITR-3 is generally the relevant AY 2026-27 return. ITR-4 is a simplified return only for eligible resident taxpayers whose business/professional income is computed under sections 44AD, 44ADA or 44AE and who satisfy the form’s other conditions, including the ₹50 lakh total-income ceiling shown on the official AY 2026-27 download page. Entity form, capital gains, foreign assets/income and other exclusions can change the return choice.

Presumptive taxation: 44AD, 44ADA or 44AE?

Medical profession is a specified profession for the professional presumptive regime, but the availability of 44ADA for AY 2026-27 must be tested against the exact professional activity, taxpayer type, residence and gross receipts. A clinic or diagnostic business cannot automatically copy the position of an individual medical practitioner. Under the Income-tax Act, 2025, medical profession is expressly included in section 62(4), with presumptive computation in section 58 where conditions are met.

A presumptive scheme is a computation method, not an exemption from maintaining evidence of turnover, banking receipts, GST data or TDS credit. Before choosing it, compare eligibility, lock-out/lower-profit consequences and the interaction with books/tax audit.

Expenses under regular computation

When income is computed under normal provisions, common business costs can include the following when they are genuinely incurred for earning the receipts and are properly documented:

• reagents and consumables
• technician/staff salaries
• lab/equipment depreciation
• rent and utilities
• quality-control/accreditation costs
• sample logistics
• software/LIS costs
• outsourced test charges

Personal expenditure, capital assets, cash payments subject to statutory restrictions, unpaid statutory liabilities and expenses lacking a business nexus need separate review. Capital assets are generally dealt with through depreciation rather than an automatic 100% deduction.

GST position

Diagnostic/investigative services forming part of health care by a qualifying clinical establishment are generally covered by the health-care exemption. Non-health-care testing, product sales or services outside the exemption can be taxable. The lab should retain evidence supporting exemption classification.

Always reconcile income-tax turnover with GST turnover after explaining legitimate differences such as exempt supplies, exports, advances, credit notes, pure-agent items, sale of capital assets or taxes collected. A mismatch is not automatically wrong, but it should be explainable.

TDS, AIS and Form 26AS

Hospitals, corporates and aggregators may deduct TDS. Referral or professional payments made by the lab can create withholding obligations in the opposite direction.

Never report only the amount received after TDS. The payer normally deducts tax from the gross payment; the gross income is reported and the TDS is claimed separately as credit, subject to reconciliation.

Books of account and tax audit

For the tax year beginning 1 April 2026, section 62 of the Income-tax Act, 2025 deals with maintenance of books and section 63 deals with tax audit. Section 63 retains the ₹1 crore business threshold, increased to ₹10 crore where both cash receipts and cash payments stay within the statutory 5% conditions, and a ₹50 lakh profession threshold, subject to the detailed rules. Presumptive-declaration rules can create separate audit consequences. For AY 2026-27, apply the corresponding 1961-Act provisions applicable to FY 2025-26.

Worked example: Diagnostic Centres & Pathology Labs

Assume a resident individual has ₹65 lakh diagnostic receipts with ₹37 lakh reagents, staff, rent and equipment-related costs during FY 2025-26. Under the normal method, a simplified first-pass computation is:

This is deliberately not a final tax computation. Depreciation, disallowances, personal-use apportionment, GST treatment, timing differences and presumptive-tax choices can alter taxable profit. If presumptive taxation is legally available, compare the deemed-profit route with regular books before filing rather than selecting the lower number automatically.

Documents to keep

• sales/service invoices and credit notes
• bank, UPI, card and payment-gateway statements
• customer and vendor ledgers
• Form 26AS, AIS and TDS certificates
• GST returns/e-invoices/e-way bills where applicable
• contracts, engagement letters or marketplace/franchise settlement statements
• asset register and depreciation support
• expense invoices and payment evidence
• inventory/stock records where goods are involved

Common mistakes to avoid

• netting aggregator payouts instead of booking gross revenue/contract deductions properly
• treating every laboratory service as GST-exempt
• weak chain between sample revenue and outsourced-test cost
• assuming professional presumptive treatment for a large lab business
• capitalising/expensing major diagnostic equipment incorrectly

Practical filing checklist

1. Identify whether each income stream is salary, business, profession, commission, trading or another category.
2. Select the Nature-of-Business code from the official AY 2026-27 schema based on actual dominant activity.
3. Test presumptive eligibility before selecting ITR-4.
4. Reconcile gross receipts with bank/UPI/platform statements, GST and TDS data.
5. Separate capital assets, inventory and personal expenditure from normal expenses.
6. Check books/tax-audit requirements and advance-tax exposure.
7. Retain a short source file showing the law/rate/form version used for the return.

Frequently asked questions

Relevant Finin2min tools

• ITR Form Selector
• Tax Audit Checker
• GST Registration Checker
• TDS Calculator
• Income Tax Calculator
• GST Calculator
• Income Tax by Business & Profession hub

Primary sources

Disclaimer: This guide is general educational information, not personalised tax, GST, legal or investment advice. Business-code selection, presumptive eligibility, GST registration/rate, TDS and deductions depend on the actual contracts, entity, State, turnover, payment pattern and applicable law for the relevant period. Verify the current official form/notification before filing.