Income Tax Return (ITR) Filing for Businesses and Professionals: A Complete Guide

Which ITR Form Does Your Business Need?

Choosing the wrong ITR form leads to defective return notices from the Income Tax Department. Here's a quick guide:

Business Type	Applicable ITR Form
Sole proprietor / Individual with business income	ITR-3 (regular) or ITR-4 (presumptive)
Partnership Firm / LLP	ITR-5
Private Limited / OPC / Company	ITR-6
Trust / AOP / BOI	ITR-7

Presumptive Taxation Scheme (Section 44AD / 44ADA)

Small businesses and professionals can opt for presumptive taxation — declare a fixed percentage as income without detailed books of accounts:

Section 44AD (Business): 8% of turnover (6% for digital receipts) presumed as profit, for businesses with turnover up to ₹3 crore
Section 44ADA (Professionals): 50% of gross receipts presumed as profit, for professionals with receipts up to ₹75 lakh

If you opt out of presumptive taxation, you must maintain proper books and get them audited if the loss declared is higher than the presumptive income.

Tax Audit Under Section 44AB

A Chartered Accountant must audit your accounts and file Form 3CA/3CB + 3CD if:

Business turnover exceeds ₹1 crore (₹10 crore if > 95% digital transactions)
Professional receipts exceed ₹50 lakh
You claim income below the presumptive limit but your turnover exceeds the prescribed threshold

Key ITR Due Dates (FY 2024-25 / AY 2025-26)

Category	Due Date
Individuals / Firms / HUF (no audit)	31st July 2025
Companies / Tax audit cases	31st October 2025
Transfer pricing cases	30th November 2025
Belated / Revised return	31st December 2025

Important Deductions for Businesses

80C: LIC, PPF, ELSS — up to ₹1.5 lakh
80D: Health insurance premium — up to ₹25,000 (₹50,000 for senior citizens)
Depreciation (Section 32): On plant, machinery, computers, vehicles
Section 37: All business expenditures wholly and exclusively for business are deductible
Section 43B: Statutory dues (PF, ESIC, tax) deductible only on actual payment — not on accrual

Penalties for Late/Non-Filing

Late filing fee: ₹5,000 (₹1,000 if total income ≤ ₹5 lakh)
Interest: 1% per month on unpaid tax under Section 234A
Interest on advance tax shortfall: Section 234B and 234C
Penalty for concealment of income: 100% to 300% of tax evaded

Advance Tax — Don't Miss It

If your estimated annual tax liability exceeds ₹10,000, you must pay advance tax in four instalments:

15 June — 15% of liability
15 September — 45% of liability
15 December — 75% of liability
15 March — 100% of liability

Missing advance tax instalments attracts 1% interest per month on the shortfall (Section 234C).