{"id":1900,"date":"2026-09-08T13:14:14","date_gmt":"2026-09-08T07:44:14","guid":{"rendered":"https:\/\/cajdshah.com\/blog\/?p=1900"},"modified":"2026-09-08T13:14:14","modified_gmt":"2026-09-08T07:44:14","slug":"tax-planning-2026-september-advance-tax-guide","status":"publish","type":"post","link":"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/","title":{"rendered":"September Advance Tax Planning 2026:Turn Your Cash-Flow Forecast into a Defensible Tax Estimate"},"content":{"rendered":"<section class=\"wpb-content-wrapper\"><p>[vc_row css=&#8221;.vc_custom_1765522538490{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<p>The 15 September 2026 deadline is the second advance-tax checkpoint for FY 2026\u201327. By that date, cumulative advance tax should generally reach at least 45% of the estimated annual advance-tax liability. For businesses, professionals, investors, and taxpayers with irregular income, the right number cannot be produced by simply dividing last year\u2019s tax by four. It should be built from current books, a realistic forecast, eligible tax credits, and documented assumptions.<\/p>\n<p>A reliable September estimate starts with actual taxable income and expenses, supported by cash-flow information. This approach helps reduce avoidable interest exposure and gives you a clear record of how the estimate was prepared.<\/p>\n<p>[\/vc_column_text][vc_separator][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#1_Why_the_September_Instalment_Trips_People_Up\" >1. Why the September Instalment Trips People Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#2_Start_with_Your_Books_Supported_by_Cash_Flow\" >2. Start with Your Books, Supported by Cash Flow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#3_Where_These_Estimates_Usually_Go_Wrong\" >3. Where These Estimates Usually Go Wrong<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#4_Building_an_Estimate_You_Can_Actually_Defend\" >4. Building an Estimate You Can Actually Defend<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#5_Handling_Capital_Gains_and_One-Off_Income\" >5. Handling Capital Gains and One-Off Income<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#6_What_It_Costs_You_If_the_Estimate_Is_Off\" >6. What It Costs You If the Estimate Is Off<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#7_A_September_Advance-Tax_Checklist\" >7. A September Advance-Tax Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/cajdshah.com\/blog\/tax-planning-2026-september-advance-tax-guide\/#8_How_JD_Shah_Associates_Can_Help\" >8. How JD Shah Associates Can Help<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1_Why_the_September_Instalment_Trips_People_Up\"><\/span>1. Why the September Instalment Trips People Up<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>By 15 September, cumulative advance tax should generally reach at least 45% of the estimated annual liability, compared with at least 15% by 15 June. September is more difficult because many businesses do not yet have complete visibility through March, and income rarely arrives evenly across the year.<\/p>\n<p>A large invoice, a delayed receivable, a property transaction, or a seasonal change in business can materially alter the annual estimate. The calculation should therefore reflect current facts rather than a simple quarterly average.<\/p>\n<p>[\/vc_column_text][vc_separator][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"2_Start_with_Your_Books_Supported_by_Cash_Flow\"><\/span>2. Start with Your Books, Supported by Cash Flow<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Dividing last year\u2019s total tax by four is an easy shortcut, but it can be unreliable if the business has grown, contracted, lost a major client, or incurred unusual expenses.<\/p>\n<p>Start with the books: review taxable income and deductible expenditure recorded from April through August. Then use bank movements and the cash-flow forecast as cross-checks. Adjust the estimate for accruals, receivables, advances, non-cash deductions, disallowances, depreciation, and other tax-specific items. Bank receipts alone are not a substitute for the taxable-income computation where an accrual-based method applies.<\/p>\n<p>For the balance of the year, use signed contracts, pending invoices, known seasonal patterns, expected expenses, and other reasonable assumptions. Record the basis for each significant assumption.<\/p>\n<p>[\/vc_column_text][vc_single_image image=&#8221;1906&#8243; img_size=&#8221;large&#8221; style=&#8221;vc_box_shadow_border&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_separator][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"3_Where_These_Estimates_Usually_Go_Wrong\"><\/span>3. Where These Estimates Usually Go Wrong<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Common omissions and errors in September advance-tax working papers include:<\/p>\n<ul>\n<li>Accrued revenue or other taxable income omitted because it has not yet been received in cash<\/li>\n<li>Bonus, commission, interest, dividend, or other income missed in the projection<\/li>\n<li>TDS credits assumed without reconciling them with Form 26AS<\/li>\n<li>AIS information not reviewed for possible mismatches or additional income indicators<\/li>\n<li>Expenses estimated too conservatively, or expenses included without checking their tax allowability<\/li>\n<li>Depreciation, brought-forward losses, or other permitted deductions forgotten in the rush<\/li>\n<li>Capital gains, ESOP vesting, or other lumpy income excluded from the estimate<\/li>\n<\/ul>\n<p>Several small errors can either cause an unnecessary cash outflow or create a shortfall that may lead to interest under the applicable advance-tax provisions.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"4_Building_an_Estimate_You_Can_Actually_Defend\"><\/span>4. Building an Estimate You Can Actually Defend<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u201cDefensible\u201d does not mean perfect. It means you can explain how the number was calculated and support the material assumptions if the estimate is later reviewed. Keep a simple working file containing:<\/p>\n<ul>\n<li>Actual income and expenses recorded from April through August<\/li>\n<li>The assumptions supporting the September-to-March projection, written in plain language<\/li>\n<li>Large one-time transactions included or excluded, with the reason documented<\/li>\n<li>The tax computation after applicable deductions, disallowances, and depreciation<\/li>\n<li>The TDS and other tax-credit reconciliation using Form 26AS, together with a review of AIS<\/li>\n<li>A record of tax already paid and the cumulative amount required by 15 September<\/li>\n<\/ul>\n<p>If the estimate later changes because a client delays payment, a contract is cancelled, or another reasonable assumption changes, this record shows that the calculation was prepared in good faith and updated as new information became available.<\/p>\n<p>[\/vc_column_text][vc_separator][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"5_Handling_Capital_Gains_and_One-Off_Income\"><\/span>5. Handling Capital Gains and One-Off Income<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Property sales, mutual-fund redemptions, securities transactions, and ESOP vesting do not necessarily occur evenly across the year. They should be reviewed when the income accrues and should not be forced into an artificial quarterly pattern.<\/p>\n<p>Capital gains and other specified one-off income should generally be included in the next remaining advance-tax instalment after the income accrues. The law also provides exceptions from instalment-interest consequences for certain specified income, subject to payment of the related tax through the remaining instalments immediately due after accrual. The exact treatment depends on the transaction, the timing, and the applicable provisions, so a transaction-specific review is advisable for substantial or complex events.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=&#8221;1905&#8243; img_size=&#8221;large&#8221; style=&#8221;vc_box_shadow_border&#8221;][vc_separator][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"6_What_It_Costs_You_If_the_Estimate_Is_Off\"><\/span>6. What It Costs You If the Estimate Is Off<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Section 424 concerns failure to pay advance tax or payment below the statutory 90% threshold, while Section 425 concerns deferment or short payment of specified advance-tax instalments. The applicable interest period, amount, and statutory exceptions depend on the final assessed tax, payment history, income type, and other facts.<\/p>\n<p>The amount may be material where the tax liability is substantial or a shortfall continues across instalments. A revised estimate should be prepared before the next due date rather than waiting until the end of the financial year.<\/p>\n<p>[\/vc_column_text][vc_separator][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"7_A_September_Advance-Tax_Checklist\"><\/span>7. A September Advance-Tax Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Update the books through 31 August.<\/li>\n<li>Estimate full-year taxable income, not only cash receipts.<\/li>\n<li>Include business income, salary, interest, dividends, capital gains, ESOP income, and other one-off income where applicable.<\/li>\n<li>Review eligible expenses, depreciation, brought-forward losses, disallowances, and the applicable tax regime.<\/li>\n<li>Reconcile TDS and other tax credits with Form 26AS and review AIS for mismatches.<\/li>\n<li>Reduce tax already paid and calculate the cumulative amount required by 15 September.<\/li>\n<li>Document significant assumptions and unusual transactions.<\/li>\n<li>Revisit the estimate before 15 December and 15 March.<\/li>\n<\/ul>\n<p>[\/vc_column_text][vc_separator][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765522550472{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"8_How_JD_Shah_Associates_Can_Help\"><\/span>8. How JD Shah Associates Can Help<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.linkedin.com\/company\/jdshahassociates\" target=\"_blank\" rel=\"noopener\"><strong>JD Shah Associates<\/strong><\/a> <a href=\"https:\/\/cajdshah.com\/contact-best-ca-in-mumbai.html\" target=\"_blank\" rel=\"noopener\"><strong>helps businesses<\/strong><\/a>, professionals, and NRIs review advance-tax estimates, reconcile TDS and AIS data, assess capital gains and other one-off income, and document the assumptions supporting each instalment. The team also provides <a href=\"https:\/\/cajdshah.com\/direct-tax-services.html\" target=\"_blank\" rel=\"noopener\"><strong>direct-tax advisory<\/strong><\/a> and compliance support from its Borivali, Mumbai office.<\/p>\n<p><strong>Disclaimer: <\/strong>This article is for general information only and is not tax, legal, or investment advice. Advance-tax treatment depends on the taxpayer\u2019s facts, accounting method, tax regime, income type, and applicable law. Please obtain professional advice before making a payment.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1900\" class=\"pvc_stats all  \" data-element-id=\"1900\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/cajdshah.com\/blog\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" =0 title=\"\"><\/p>\n<div class=\"pvc_clear\"><\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>[vc_row css=&#8221;.vc_custom_1765522538490{margin-top: 20px !important;margin-bottom: 20px !important;}&#8221;][vc_column][vc_column_text] The 15 September 2026 deadline is the second advance-tax checkpoint for FY 2026\u201327. By that date, cumulative advance tax should generally reach at least 45% of the estimated annual advance-tax liability. For businesses, professionals, [&hellip;]<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1900\" class=\"pvc_stats all  \" data-element-id=\"1900\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/cajdshah.com\/blog\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":1,"featured_media":1908,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,5,6,11,12],"tags":[57,23,33],"class_list":["post-1900","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-business","category-company","category-finance","category-gst","category-ipo","tag-gst-consultant","tag-income-tax","tag-tax-audit"],"_links":{"self":[{"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/posts\/1900","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/comments?post=1900"}],"version-history":[{"count":5,"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/posts\/1900\/revisions"}],"predecessor-version":[{"id":1907,"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/posts\/1900\/revisions\/1907"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/media\/1908"}],"wp:attachment":[{"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/media?parent=1900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/categories?post=1900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cajdshah.com\/blog\/wp-json\/wp\/v2\/tags?post=1900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}