The law
Income-tax Act 1961, Sec 43(5)
A contract settled without delivery is speculative, except eligible derivative transactions on a recognised stock exchange (and eligible commodity derivatives); intraday equity remains speculativeSource
Income-tax Act 1961, Sec 73 (now Sec 113)
Speculation loss is set off only against speculation profit and carried forward for at most 4 assessment yearsSource
Income-tax Act 1961, Sec 72 and 80 (now Sec 112 and 121)
Non-speculative business loss carried forward up to 8 years against business income, only if the return is filed in time under Sec 263 (old Sec 139(3))Source
Income-tax Act 1961, Sec 44AB (now Sec 63)
Tax audit if business turnover exceeds ₹1 crore, raised to ₹10 crore where cash receipts and cash payments are each not over 5%; also where a person who opted for Sec 58 (old Sec 44AD) declares lower profit within the 5-year lock-in and income exceeds the basic exemption limitSource
ICAI Guidance Note on Tax Audit under Sec 63 (old Sec 44AB; Revised 2023), para 5.10(b)
Derivatives turnover = total of favourable and unfavourable differences on squared-off trades; premium on options sold included unless already in net profit; reverse trade differences includedSource
Income-tax Act 2025, Sec 63 and Sec 263
From tax year 2026-27 tax audit moves to Sec 63 and return filing to Sec 263Source
Income-tax Act 2025, Sec 536(2)(m) and (n)
F&O and speculation losses from years before 1 April 2026 keep their character and are carried forward under the 2025 ActSource
Government fee
No government fee. Business income is taxed at slab rates. Source: https://www.incometax.gov.in/iec/foportal/help/individual/return-applicable-1
Late fee or penalty
Late return: Sec 428 (old Sec 234F) fee up to ₹5,000 and loss of carry forward for business and speculation losses. Sources: https://www.incometaxindia.gov.in/w/section-234f and https://www.incometaxindia.gov.in/w/section-80-7 . Late tax audit report from tax year 2026-27: reported penalty of ₹75,000 (delay up to 1 month) or ₹1.5 lakh. Source: https://www.businesstoday.in/amp/personal-finance/tax/story/itr-due-dates-revised-returns-and-audit-penalties-3-big-tax-changes-from-ay-2026-27-537295-2026-06-17