Filing of Income Tax Return (ITR) is mandatory under Section 139(1) of the Income-tax Act, 1961 in two distinct categories of situations: (A) Income-based mandatory filing, and (B) Transaction-based mandatory filing — irrespective of income. (A) Income-based threshold for individuals — ITR mandatory if total income before Chapter VI-A deductions exceeds the basic exemption limit: ₹2,50,000 for individuals below 60 years (old regime); ₹3,00,000 for senior citizens (60-80 years, old regime); ₹5,00,000 for super senior citizens (80+ years, old regime); ₹3,00,000 / ₹4,00,000 for new regime (Sec 115BAC) depending on year. For HUF, AOP, BOI — ₹2.5 lakhs old regime. For partnership firms, LLPs, AOPs, BOIs, companies, charitable trusts — ITR mandatory regardless of income (i.e., even nil-income or loss). (B) Transaction-based mandatory filing — under Section 139(1) Seventh Proviso (effective from FY 2019-20) and CBDT Notification, an individual must file ITR even if income is below threshold, if any of these conditions are met: (i) Deposited aggregate amount exceeding ₹1 crore in one or more current accounts; (ii) Incurred aggregate expenditure of more than ₹2 lakh on foreign travel for self or any other person; (iii) Incurred aggregate expenditure exceeding ₹1 lakh on electricity consumption; (iv) Holds any asset (including financial interest) located outside India OR is a signing authority on any account located outside India OR is a beneficiary of any asset located outside India — regardless of income; (v) Total sales / turnover / gross receipts in business exceed ₹60 lakhs; (vi) Total gross receipts in profession exceed ₹10 lakhs; (vii) TDS + TCS aggregate during the year is ₹25,000 or more (₹50,000 for senior citizens); (viii) Deposits in savings bank accounts aggregate to ₹50 lakhs or more in a year. Additional reasons to file even when not strictly mandated: (1) Refund claim — TDS / TCS / advance tax exceeds actual liability; (2) Loss carry-forward — Sec 80 mandates timely Sec 139(1) ITR for carry-forward of business / capital / speculation losses (except house property); (3) Loan / visa / financial document — banks, embassies, financial institutions routinely require last 2-3 years' ITR copies as income proof; (4) Capital gains transactions — even if exempt under Sec 54 / 54F / 54EC, ITR filing required to claim the exemption; (5) Compliance for high-value transactions — to provide proper trail for AIS / TIS reported transactions and avoid Sec 143(2) scrutiny / Sec 148 reassessment; (6) For NRIs — to claim refund of excess Sec 195 TDS deducted by buyers / payers, claim DTAA benefits, and file Form 67 for foreign tax credit. Penalty for non-filing — Sec 234F late fee (₹5,000 / ₹1,000), Sec 234A interest 1% per month, Sec 80 loss-carry-forward forfeit, Sec 143(2) scrutiny risk, Sec 148 reassessment, Sec 276CC prosecution (3 months to 7 years for wilful default with tax > ₹10,000). Best practice — file ITR every year regardless of strict mandate, both to maintain financial record and to avail refund / loss / compliance benefits. Our practice maps each client's situation to the mandatory triggers and recommends timely filing aligned with their full tax position.

India has seven ITR forms — ITR-1 through ITR-7 — each designed for specific taxpayer profiles. Choosing the wrong form is a common error that triggers Sec 139(9) defective return notices and processing delays. ITR-1 (Sahaj) — for resident individuals (NOT NR / RNOR / HUF) with: total income up to ₹50 lakhs; income from salary, one house property, other sources (interest / dividends), and agricultural income up to ₹5,000. NOT for: capital gains, business income, multiple house properties, foreign income / assets, director in a company, holding unlisted shares, brought-forward losses. ITR-2 — for individuals and HUFs without business / professional income. Suitable for: salaried with capital gains; NRIs / RNORs; multiple house properties; foreign assets / income; director in company; unlisted shares; income from lottery / horse racing. NOT for: business / profession income. ITR-3 — for individuals / HUFs with business or professional income (no presumptive). Required for: self-employed professionals, sole proprietors with regular books, partner in a firm receiving profit / interest / remuneration, business with audit. ITR-4 (Sugam) — for resident individuals / HUFs / firms (other than LLP) with presumptive income under Section 44AD (small business with turnover up to ₹2cr / ₹3cr digital), Section 44ADA (specified professionals up to ₹50L / ₹75L digital), or Section 44AE (goods carriage operators up to 10 vehicles); total income up to ₹50 lakhs. NOT for: regular business / profession (use ITR-3), capital gains (use ITR-2 or ITR-3), foreign assets, more than one house property. ITR-5 — for partnership firms, LLPs, AOPs (Association of Persons), BOIs (Body of Individuals), Investment Funds, Estate of Deceased / Insolvent, Business Trust (REITs / InvITs as applicable), Co-operative Societies. NOT for: companies (ITR-6), charitable trusts (ITR-7), individuals / HUFs. ITR-6 — for companies (Private Limited, OPC, Public Limited) other than companies claiming exemption under Section 11 (charitable). Mandatory e-filing with DSC. ITR-7 — for persons including companies required to furnish return under Section 139(4A) (charitable / religious trusts), 139(4B) (political parties), 139(4C) (research / educational / news / hospital institutions), 139(4D) (universities / colleges). Due dates for AY 2025-26 (FY 2024-25): (1) 31 July 2025 — non-audit cases (most salaried, presumptive ITR-4 filers, individual ITR-2 with no audit); (2) 31 October 2025 — audit cases under Sec 44AB; companies (ITR-6); LLPs subject to audit; (3) 30 November 2025 — entities with international transactions / specified domestic transactions requiring transfer pricing report (Form 3CEB / Sec 92E). For ITR-7 trusts, due dates align with their audit applicability (31 October typically). After due date: (a) Belated return under Sec 139(4) — until 31 December 2025 with Sec 234F fee + Sec 234A interest; (b) Updated return ITR-U under Sec 139(8A) — until 31 March 2030 (48 months after end of AY 2025-26) with additional tax 25%-70%. AY-AY note — Assessment Year (AY) 2025-26 covers Financial Year (FY) 2024-25 (i.e., income earned 1 April 2024 – 31 March 2025 is reported in ITR for AY 2025-26). Belated and Revised Return distinction — Belated u/s 139(4): missed the original due date entirely; Revised u/s 139(5): correcting an earlier-filed return; both filed by 31 December of AY. Our practice maps each client to the correct ITR form considering their full income profile, residential status, and asset / business position.

Section 115BAC introduced an alternative "new tax regime" for individuals and HUFs offering lower slab rates in exchange for surrendering most exemptions and deductions. Effective FY 2023-24 (AY 2024-25), the new regime became the DEFAULT — taxpayers must actively opt for the old regime if they wish to use it. Old regime — slab rates (FY 2024-25): up to ₹2.5L (₹3L senior, ₹5L super senior) — nil; ₹2.5-5L — 5%; ₹5-10L — 20%; above ₹10L — 30%; surcharge above ₹50L; cess 4%. Allows: HRA, LTA, Standard Deduction ₹50K (salaried), Sec 80C (₹1.5L), 80D, 80E, 80EE, 80G, 80TTA / 80TTB, 80U, home loan interest u/s 24, leave encashment, gratuity, medical expense, professional tax, all Chapter VI-A. New regime (Sec 115BAC, FY 2024-25) — slab rates: up to ₹3L — nil; ₹3-7L — 5%; ₹7-10L — 10%; ₹10-12L — 15%; ₹12-15L — 20%; above ₹15L — 30%; surcharge applies but capped at 25% (vs 37% old regime); cess 4%. Allows: Standard Deduction ₹75K (salaried, increased from ₹50K), Standard deduction on family pension ₹25K (increased from ₹15K), Sec 80CCD(2) employer NPS contribution, Sec 80JJAA additional employee deduction, Sec 24(b) home loan interest only for let-out property (NOT self-occupied), agniveer fund 80CCH. Disallows: HRA, LTA, Sec 80C investments, 80D, 80E, 80G, 80TTA / 80TTB, 80U, self-occupied home loan interest, Chapter VI-A deductions other than 80CCD(2) / 80JJAA / 80CCH. Decision framework: (1) Compute tax under both regimes — at the gross income level, factor in all eligible deductions / exemptions in old regime; (2) Compare final tax — choose the lower; (3) Break-even analysis — for most salaried taxpayers, the breakeven is around ₹15-17 lakhs gross with ₹3-4 lakhs of deductions; below that level, new regime usually wins; above that with substantial deductions (home loan interest + 80C maxed + HRA + 80D), old regime may save more. Practical illustration — Salary ₹15L, HRA exempt ₹2L, Sec 80C ₹1.5L, 80D ₹50K, home loan interest ₹2L: Old regime taxable income ₹15L - ₹50K STD - ₹2L HRA - ₹2L home interest - ₹1.5L 80C - ₹50K 80D = ₹8.5L; tax = ₹47,500 + ₹49,400 surcharge / cess + slabs = approximately ₹85,000 (rounded). New regime taxable income ₹15L - ₹75K STD = ₹14.25L; tax (FY 24-25 slabs) = approximately ₹1,12,500 + cess. Old regime saves ₹27K in this example. Same person without home loan / HRA / 80C usage → new regime wins. Choosing the regime: (a) Salaried (no business income) — can choose between old and new EVERY year by ticking the option in ITR; default new from FY 2023-24+; (b) Business / professional income (ITR-3 / ITR-4) — once opted out of new regime via Form 10-IEA, can opt back into new only one more time in future; the "switching" is more restricted; (c) Form 10-IEA — to opt OUT of new regime (i.e., into old regime) for business income filers; must be filed before due date of ITR; failure to file Form 10-IEA = stuck with new regime by default; (d) For salaried — no Form 10-IEA needed; just select old regime in ITR; (e) Multiple income sources — same regime applies to all heads in a year. Common errors: (1) Choosing regime based on slab rates alone without computing deductions; (2) Failing to file Form 10-IEA timely for business income filers and being stuck with default new regime; (3) Selecting new regime then realising mid-year that old regime would have saved more — irreversible for that year; (4) Senior citizens — new regime does NOT extend the higher exemption limit benefit (only ₹3L, not ₹3L / ₹5L); seniors with substantial Sec 80TTB and 80D often prefer old regime. Our practice runs both-regime computations for every ITR client and recommends the optimal choice for the year, including Form 10-IEA filing for business filers when needed.

Form 26AS, AIS, and TIS are the three statutory data statements issued by the Income-tax Department that compile financial transactions and tax credits associated with a taxpayer's PAN — and are the foundation of any accurately-filed ITR. Reconciling ITR figures with these statements before filing is no longer optional — mismatches automatically trigger Sec 143(1)(a) communications and can escalate to Sec 143(2) scrutiny. Form 26AS — the original Tax Credit Statement, available since 2008. Contents: (a) Part A — TDS deducted by deductors (employer salary TDS, bank FD interest TDS, mutual fund / dividend TDS, contractors / professionals / rent TDS); (b) Part B — TCS collected; (c) Part C — advance tax / self-assessment tax / regular assessment tax payments via challans; (d) Part D — refund details; (e) Part E — high-value transactions reported by banks / SROs (since merged into AIS); (f) Part F — TDS on sale of property under Sec 194-IA (now also in AIS); (g) Part G — defaults processing details. Access — through e-filing portal "View 26AS" link, or directly from TRACES. AIS (Annual Information Statement) — introduced from FY 2021-22 (AY 2022-23) onwards as a comprehensive transaction view, going far beyond Form 26AS. Contents: (a) All Form 26AS data (TDS / TCS / advance tax / refund); (b) Salary information from Form 16; (c) Interest from savings accounts, fixed deposits (banks report); (d) Dividend income (companies / RTAs report); (e) Securities transactions — equity shares, mutual fund units, derivatives, debentures (depository / RTA report); (f) Sale and purchase of immovable property (registrar reports); (g) Foreign remittances (Form 15CC / 15CA reporting); (h) Off-market debits / credits in demat accounts; (i) Cash deposits / withdrawals above thresholds; (j) Credit card payments above thresholds; (k) GST turnover (cross-feed from GSTN); (l) Expenditure on foreign travel / electricity / education / etc. above thresholds. Access — e-filing portal "AIS" tab. TIS (Taxpayer Information Summary) — a simplified summary of AIS, presenting aggregated values per category (e.g., total interest income, total dividend, total securities purchase / sale) — meant for quick taxpayer review. Access — e-filing portal alongside AIS. Critical role in ITR filing: (1) Pre-filling — the e-filing portal auto-populates ITR with data from Form 26AS / AIS — taxpayer must verify and correct; (2) Reconciliation — every income head in the ITR should match the corresponding AIS / 26AS entries, and discrepancies must be either corrected in ITR or feedback-flagged in AIS portal; (3) Sec 143(1)(a) prevention — ITR figures lower than AIS-reported income trigger automated processing communication asking the taxpayer to either pay differential tax or explain; (4) Risk profiling — AIS data feeds into the Department's risk parameters for scrutiny selection under Sec 143(2). Common reconciliation issues: (a) AIS shows interest reported by bank that taxpayer hasn't fully captured — e.g., bank FD interest, savings account interest above ₹10K (Sec 80TTA limit) creates apparent under-reporting; (b) Bonus shares / corporate actions reflected in securities purchase / sale data — taxpayer must explain non-taxable nature in ITR; (c) Stock split / merger / demerger transactions appearing as multiple sale / purchase entries — need accurate aggregation; (d) Joint account transactions reported in PAN of one holder — taxpayer must apportion correctly; (e) Pre-filled HRA / 80C from employer Form 16 may be different from actual eligible amounts — needs adjustment. AIS feedback mechanism — taxpayers can submit feedback on incorrect AIS entries through the AIS portal: "information is correct", "information is duplicate", "information relates to other PAN", "information is incorrect", "information is partially correct", "information is denied". Submitted feedback is reviewed by source reporter; aligned data flows back to Form 26AS / AIS. Our practice begins every ITR engagement with a comprehensive AIS / TIS / Form 26AS reconciliation — identifying every reportable transaction, raising AIS feedback where data is incorrect, and ensuring the ITR figures are fully aligned with the Department's pre-existing data view. This single step prevents the majority of post-filing 143(1) intimations.

Filing ITR after the due date or failing to file altogether triggers a cascade of financial, procedural, and prosecutorial consequences under the Income-tax Act, 1961. The severity scales with the period of delay and the quantum of tax involved. (1) Late filing fee under Section 234F: A flat fee of ₹5,000 if ITR is filed after the due date but on or before 31 December of the relevant assessment year; ₹1,000 if total income does not exceed ₹5 lakhs. The fee applies regardless of whether tax is payable, refund is claimed, or income is below taxable threshold (where filing is mandatory due to seventh proviso transactions). (2) Interest under Section 234A: Charged at 1% per month (or part of month) on the amount of tax payable (after TDS / advance tax / self-assessment tax credit), from the day after the due date to the date of actual filing. Even partial delay attracts a full month's interest. (3) Loss-carry-forward forfeiture under Section 80: Business loss (8 years), capital loss (8 years for STCL / LTCL), speculation loss (4 years), specified business loss (Sec 35AD — indefinite) — ALL forfeited if Sec 139(1) due date is missed. The ONLY exception is house property loss (Sec 71B), which can be carried forward for 8 years even with a belated return. This is one of the most expensive consequences for businesses with current-year losses. (4) Refund delay / interest reduction: Sec 244A interest on refund is computed only from 1 April of AY (or actual date of payment) to date of refund — but for belated returns, interest may be reduced or denied for the period of delay. (5) Sec 143(2) scrutiny risk: Non-filers and late filers are flagged in the Department's risk-profiling system and face higher likelihood of scrutiny selection. (6) Sec 148 reassessment: Income escaping assessment due to non-filing can be reopened — within 3 years if escaped income up to ₹50 lakhs; up to 10 years if ₹50 lakhs+ from undisclosed sources. (7) Sec 276CC prosecution: Wilful failure to furnish ITR where tax payable (after credit) exceeds ₹10,000 is punishable with: (a) Rigorous imprisonment from 6 months to 7 years and fine where tax sought to be evaded exceeds ₹25 lakhs; (b) Rigorous imprisonment from 3 months to 2 years and fine in other cases. The prosecution is triggered after specified delays and notices, and Department's threshold has lowered over the years. (8) Sec 271F penalty (pre-2018): Replaced by Sec 234F; not applicable to current-year filings. (9) Compliance burden — banks / lenders / embassies require recent ITR copies; non-filers face friction in: home loan applications (most lenders require ITR-V of last 2-3 years); business loan / OD / credit card applications; visa applications (especially USA, UK, Schengen — embassies routinely request 2-3 years' ITR + Form 26AS); rental agreements with corporate landlords; tendering / professional registration. Belated return option (Sec 139(4)): Available till 31 December of AY (for FY 2024-25 / AY 2025-26 = until 31 December 2025). Loss-carry-forward forfeit; otherwise ITR validly filed. Updated return ITR-U (Sec 139(8A)): Available for up to 48 months from the end of the relevant AY (extended from 24 months by Finance Act 2025). Additional tax payable: 25% (within 12 months from end of AY), 50% (12-24 months), 60% (24-36 months), 70% (36-48 months) on the tax + interest that would otherwise be payable. ITR-U cannot be used to: reduce tax / increase refund / increase loss / increase carry-forward / claim depreciation / reduce business income — i.e., only permits payment of additional tax on under-reported income. ITR-U is therefore best for: missed income disclosure where the taxpayer wants to pay before being caught; remediating missed Schedule FA disclosure with Black Money Act risk mitigation; addressing AIS-flagged items where there is a clear under-reporting. ITR-U is NOT for: revising deductions, regime selection, or other tax-saving claims. Best practice — file Sec 139(1) ITR on time every year; if missed, file belated under Sec 139(4) before 31 December; if material under-reporting discovered later, file ITR-U with proper additional tax. Our practice handles late, belated, and ITR-U filings with full risk-mitigation focus, especially for clients with prior-year disclosure gaps.

E-verification is a CRITICAL step in the ITR filing process — without it, the ITR is treated as NOT FILED, and all the work and tax payment can be wasted. The statutory framework: ITR uploaded on the e-filing portal must be verified within 30 days of filing (reduced from 120 days by CBDT Notification dated 29 July 2022, effective for ITRs filed on or after 1 August 2022). If not verified within 30 days, the ITR is treated as invalid / non-filed, and the taxpayer loses the benefits of timely filing — late fee under Sec 234F, loss carry-forward forfeit, Sec 234A interest from original due date — even though the ITR was technically uploaded on time. Methods of e-verification: (1) Aadhaar OTP — most common; PAN-Aadhaar must be linked and Aadhaar-linked mobile must be active; OTP sent to Aadhaar mobile; entered on e-filing portal; one-click verification; (2) Net Banking — login to selected bank's net banking; navigate to "income tax e-filing" link; click verify ITR; redirected and verified instantly; supported by SBI, ICICI, HDFC, Axis, Bank of Baroda, PNB, and most major banks; (3) Bank Account-based EVC (Electronic Verification Code) — requires pre-validated bank account on e-filing portal; generate EVC; enter on portal; verified; (4) Demat Account-based EVC — similar process via demat account validation; (5) ATM-based EVC — generated through ATM of select banks (declining usage); (6) DSC (Digital Signature Certificate) — mandatory for: companies filing ITR-6, audit cases under Sec 44AB, taxpayers with total income above ₹5 crore (for whom DSC is increasingly mandatory), and all entities under transfer pricing audit. DSC must be Class 2 / Class 3 from a Certifying Authority; registered on e-filing portal; sign at filing. (7) Physical ITR-V — alternative for those without e-verification means; print ITR-V (acknowledgement); sign in BLUE INK; mail to "Centralised Processing Centre, Income Tax Department, Bengaluru – 560500" via Speed Post / Ordinary Post (not courier); must reach CPC within 30 days. The 30-day rule applies regardless of method — even ITR-V by post must REACH CPC within 30 days, not be merely posted within 30 days. Verification status: After successful verification, taxpayer receives confirmation email and SMS; status changes from "Successfully filed" to "ITR Verified"; available on e-filing portal under "Filed Returns". CPC begins processing only after verification — no verification = no processing. Consequences of not verifying within 30 days: (1) ITR treated as not filed — original filing date is wiped; (2) If 30-day window expires before due date — taxpayer can still file fresh ITR before due date; (3) If 30-day window expires after due date — taxpayer must file belated return under Sec 139(4) by 31 December with Sec 234F + Sec 234A; (4) If 31 December also passed — only ITR-U option with additional tax 25%-70%; (5) Loss-carry-forward — if original ITR was filed within Sec 139(1) due date but verification missed 30-day window after the Sec 139(1) due date, loss-carry-forward forfeited; (6) Refund — refund processing halted until verification; if verification window expires entirely, refund forfeited. Common verification mistakes: (a) Mobile not linked to Aadhaar / mobile out of service — Aadhaar OTP fails; (b) PAN-Aadhaar not linked — Aadhaar OTP and most EVC methods fail; PAN-Aadhaar linking is itself mandatory now — non-linked PAN is treated as inoperative under Rule 114AAA; (c) Bank account not pre-validated — EVC fails; (d) DSC expired or not registered — fails for audit / company / TP cases; (e) ITR-V sent to wrong address or via courier (CPC accepts only Speed Post / Ordinary Post); (f) Multiple verification attempts on same day — system may temporarily block; (g) ITR uploaded but wallet-attention diverts — passes 30 days unverified. Our practice ensures e-verification is completed at the time of ITR filing itself — Aadhaar OTP or EVC instantly invoked; verification status confirmed on the same session; for clients with linkage / DSC issues, alternative methods deployed before the 30-day window expires; periodic check on "ITR Verified" status until processing.

Section 143(1) of the Income-tax Act provides the framework for the initial automated processing of every filed ITR by the Centralised Processing Centre (CPC), Bengaluru — and the issuance of an "Intimation under Section 143(1)" communicating the outcome. This is NOT a scrutiny notice — it is the system's automated computation result. Almost every ITR filer receives a 143(1) intimation; understanding what it says and how to respond is essential. Process: (1) ITR filed and verified — enters CPC processing queue; (2) CPC software performs automated checks: (a) Arithmetical errors — addition, totalling errors in the ITR; (b) Incorrect claims — patently inadmissible deductions, e.g., 80C above ₹1.5L; (c) Disallowance of loss claims — where ITR is filed beyond Sec 139(1) due date for loss-carry-forward; (d) Disallowance of expenditures indicated in audit report but not in ITR; (e) Addition of income shown in Form 26AS / AIS but not in ITR; (f) Mismatch with Form 26AS TDS / TCS / advance tax. (3) Pre-Sec 143(1)(a) communication — for items (b)-(e) above, CPC sends a Sec 143(1)(a) "communication of proposed adjustments" with 30 days for the taxpayer to respond agreeing or disagreeing with reasons; if no response, the adjustment is made automatically. (4) Sec 143(1) intimation — final processing result issued generally within 9-12 months of filing, and statutorily within 9 months from end of FY in which ITR was filed (so for ITR filed FY 2024-25, intimation by 31 December 2026). Three possible outcomes: (A) "Intimation u/s 143(1)" with NO mismatch — return accepted as filed; refund (if any) released; no further action needed. (B) Intimation showing REFUND — different from filed amount? Compare; if reduced, check the working; investigate adjustments. (C) Intimation showing TAX DEMAND — ITR processed at higher tax than filed; reasons given (e.g., income added from AIS, deduction disallowed, TDS not credited). Comprehension of intimation: (1) The intimation has two columns — "As Filed" and "As Computed" — with each line item compared; (2) Differences between columns are the system's adjustments; (3) Reasons for adjustments listed as "Reason Codes" with descriptions; (4) Refund / demand / no-change shown in summary; (5) Bank account for refund credit / payment instructions for demand. Response options: (1) AGREE with intimation: (a) Refund — no action needed; refund credited to pre-validated bank account; (b) Demand — pay within 30 days using Sec 156 challan (using outstanding-demand link on e-filing portal); after payment, demand cleared automatically. (2) DISAGREE with intimation — multiple options: (a) "Agree with addition / disallowance" but pay later; (b) "Disagree with intimation" — file response within 30 days on e-filing portal explaining the disagreement; CPC reviews and may revise; (c) Sec 154 rectification application — if there is an apparent mistake (e.g., TDS clearly reflected in Form 26AS but not credited by CPC), file Sec 154 application on portal; (d) Sec 246A appeal to CIT(A) — if disagreement persists and demand stands; appeal filed in Form 35 with fee within 30 days. Common 143(1) issues: (1) TDS mismatch — TDS shown in ITR not matching Form 26AS due to deductor's late filing or wrong PAN; usually resolved by waiting for Form 26AS update or through Sec 154; (2) Deduction disallowance — Sec 80C / 80D claimed beyond cap; intimation auto-restricts; usually correct, taxpayer should verify; (3) Loss carry-forward — if ITR filed late, loss carry-forward disallowed; legitimate; (4) AIS-based additions — income shown in AIS but not in ITR; if AIS data is genuinely wrong, file feedback on AIS portal AND respond to 143(1)(a) communication; (5) Foreign tax credit — Form 67 not filed timely or amounts mismatched; FTC denied; partial remedy via Sec 154; (6) Bank account validation — refund failed; pre-validate bank account and respond. Time limits: (a) Response to Sec 143(1)(a) communication — 30 days from date of communication; (b) Sec 154 rectification — within 4 years from end of FY in which the order was passed; (c) Sec 246A appeal — within 30 days from receipt of intimation. Our practice handles 143(1) intimation reconciliation on every ITR client's behalf — checking the intimation upon receipt, identifying agreement / disagreement items, filing Sec 154 rectification or appeal where warranted, and ensuring refund credit or demand discharge is completed cleanly.