{"id":3962,"date":"2026-05-11T12:30:58","date_gmt":"2026-05-11T12:30:58","guid":{"rendered":"https:\/\/getw9.tax\/blog\/?p=3962"},"modified":"2026-05-11T12:30:59","modified_gmt":"2026-05-11T12:30:59","slug":"first-b-notice-vs-second-b-notice","status":"publish","type":"post","link":"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/","title":{"rendered":"First B Notice vs Second B Notice: What Businesses Should Know"},"content":{"rendered":"\n<p>A B Notice is not just another tax letter.<\/p>\n\n\n\n<p>It usually means the IRS found a problem with a payee\u2019s name or Taxpayer Identification Number, also called a TIN. This can happen when a business files an information return, such as a Form 1099, with a missing TIN, an obviously incorrect TIN, or a name\/TIN combination that does not match IRS records.<\/p>\n\n\n\n<p>The IRS may send a CP2100 or CP2100A notice to the payer. If you need a step-by-step response process, read our guide on the <strong><a href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/\" type=\"link\" id=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/\">CP2100 and B Notice process<\/a><\/strong>. A CP2100 is generally issued when there are 50 or more incorrect information returns, while a CP2100A is used when there are fewer than 50. The instructions are generally the same; the difference is the number of incorrect returns listed.<\/p>\n\n\n\n<p>This matters because a small vendor data issue can turn into a backup withholding problem if it is not handled properly.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#What_is_a_B_Notice\" >What is a B Notice?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#What_is_a_First_B_Notice\" >What is a First B Notice?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#What_is_a_Second_B_Notice\" >What is a Second B Notice?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#First_B_Notice_vs_Second_B_Notice_Simple_comparison\" >First B Notice vs Second B Notice: Simple comparison<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#How_quickly_should_businesses_act\" >How quickly should businesses act?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#Why_these_problems_happen\" >Why these problems happen<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#How_better_W-9_collection_helps\" >How better W-9 collection helps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/getw9.tax\/blog\/first-b-notice-vs-second-b-notice\/#Simple_takeaway\" >Simple takeaway<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_B_Notice\"><\/span>What is a B Notice?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A B Notice is a backup withholding notice sent by the payer to the payee.<\/p>\n\n\n\n<p>In simple terms, it tells the payee:<\/p>\n\n\n\n<p><em>\u201cThe name or tax ID we have for you may not match IRS records. Please help us correct it.\u201d<\/em><\/p>\n\n\n\n<p>The IRS has two types of B Notices:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First B Notice<\/li>\n\n\n\n<li>Second B Notice<\/li>\n<\/ul>\n\n\n\n<p>They are not the same. The steps are different, and businesses should not treat both notices like a normal W-9 follow-up.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_First_B_Notice\"><\/span>What is a First B Notice?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A First B Notice is usually the first formal notice connected to a name\/TIN mismatch for a specific account.<\/p>\n\n\n\n<p>For a First B Notice, the business generally sends the payee the First B Notice along with Form W-9. The payee is asked to complete and sign the W-9 with the correct legal name and TIN. This is also why businesses should know <strong><a href=\"https:\/\/getw9.tax\/blog\/when-to-request-a-new-w9\/\" type=\"link\" id=\"https:\/\/getw9.tax\/blog\/when-to-request-a-new-w9\/\">when to request a new W-9<\/a><\/strong> instead of relying on old vendor records.<\/p>\n\n\n\n<p>The goal is simple: correct the vendor record before the same issue appears again.<\/p>\n\n\n\n<p>For example, a mismatch may happen because:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the vendor used a DBA instead of the legal name<\/li>\n\n\n\n<li>the EIN or SSN was typed incorrectly<\/li>\n\n\n\n<li>the business name changed<\/li>\n\n\n\n<li>the W-9 on file is old<\/li>\n\n\n\n<li>the vendor record was entered manually with mistakes<\/li>\n<\/ul>\n\n\n\n<p>This is why W-9 collection should happen before payment, not after year-end reporting starts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_Second_B_Notice\"><\/span>What is a Second B Notice?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A Second B Notice is more serious.<\/p>\n\n\n\n<p>It can happen when the same account appears again on a CP2100 or CP2100A notice within a three-calendar-year period. IRS Publication 1281 explains that the Second B Notice is different from the First B Notice and tells the payee to contact the IRS or SSA to obtain the correct name\/TIN combination.<\/p>\n\n\n\n<p>Here is the key point businesses should not miss:<\/p>\n\n\n\n<p><strong>For a Second B Notice, the business should not simply send another Form W-9.<\/strong><\/p>\n\n\n\n<p>IRS guidance says the Second B Notice should not include Form W-9. Instead, the payee may need to provide stronger validation, such as a copy of their Social Security card or an IRS Letter 147C verifying the correct name and EIN.<\/p>\n\n\n\n<p>That is the big difference.<\/p>\n\n\n\n<p>A First B Notice usually asks for a signed W-9.<br>A Second B Notice may require official validation from the SSA or IRS.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"First_B_Notice_vs_Second_B_Notice_Simple_comparison\"><\/span>First B Notice vs Second B Notice: Simple comparison<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th>Topic<\/th><th>First B Notice<\/th><th>Second B Notice<\/th><\/tr><\/thead><tbody><tr><td>When it happens<\/td><td>First CP2100\/CP2100A listing for that account<\/td><td>Second listing within a three-calendar-year period<\/td><\/tr><tr><td>What the payer sends<\/td><td>First B Notice and Form W-9<\/td><td>Second B Notice, but not Form W-9<\/td><\/tr><tr><td>What the payee provides<\/td><td>Completed and signed W-9<\/td><td>SSA or IRS validation, depending on the TIN type<\/td><\/tr><tr><td>Why it matters<\/td><td>Corrects the vendor record<\/td><td>Shows the mismatch may have repeated<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_quickly_should_businesses_act\"><\/span>How quickly should businesses act?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Businesses should not ignore a CP2100 or CP2100A notice.<\/p>\n\n\n\n<p>IRS Publication 1281 says payers generally have 15 business days from the date of the CP2100 or CP2100A notice, or the date they received it if later, to send the required B Notice.<\/p>\n\n\n\n<p>Backup withholding may also apply. The IRS says backup withholding is currently 24% and may be required when a payee fails to provide a correct TIN.<\/p>\n\n\n\n<p>That is why the process should be tracked carefully. This is not something teams should manage through scattered emails and spreadsheets.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_these_problems_happen\"><\/span>Why these problems happen<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Most B Notice issues start with basic vendor data problems.<\/p>\n\n\n\n<p>Common examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>legal name entered incorrectly<\/li>\n\n\n\n<li>DBA used instead of legal business name<\/li>\n\n\n\n<li>EIN or SSN entered with a typo<\/li>\n\n\n\n<li>missing W-9<\/li>\n\n\n\n<li>outdated W-9<\/li>\n\n\n\n<li>incomplete vendor record<\/li>\n\n\n\n<li>vendor information stored across different inboxes or spreadsheets<\/li>\n<\/ul>\n\n\n\n<p>Some teams also use <strong><a href=\"https:\/\/getw9.tax\/blog\/irs-tin-matching-101-when-to-use-it-what-it-catches-what-it-doesnt-2026-guide\/\">TIN matching<\/a><\/strong> before filing information returns to catch name\/TIN issues earlier. The uncomfortable truth is simple: if your team collects W-9s manually, mistakes are easier to miss.<\/p>\n\n\n\n<p>A vendor may send the form. Someone may save it in an email thread. Another person may enter the details into a spreadsheet. Later, the information may be used for 1099 filing without anyone checking whether the legal name and TIN were captured correctly.<\/p>\n\n\n\n<p>That is how a small data issue becomes a compliance headache.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_better_W-9_collection_helps\"><\/span>How better W-9 collection helps<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A cleaner W-9 process helps businesses reduce avoidable name\/TIN problems.<\/p>\n\n\n\n<p>The goal is not just to \u201cget the form.\u201d The goal is to collect the right information, store it properly, and make it easy to find when needed.<\/p>\n\n\n\n<p>A better process should include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>requesting the W-9 before payment<\/li>\n\n\n\n<li>collecting the vendor\u2019s legal name and TIN clearly<\/li>\n\n\n\n<li>keeping the completed W-9 in one place<\/li>\n\n\n\n<li>tracking submission history<\/li>\n\n\n\n<li>avoiding scattered email attachments<\/li>\n\n\n\n<li>reviewing vendor records before 1099 season<\/li>\n<\/ul>\n\n\n\n<p>This gives accounting and AP teams a better chance of catching issues before they become IRS notices.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1778422565311\"><strong class=\"schema-faq-question\">What is the difference between a First B Notice and a Second B Notice?<\/strong> <p class=\"schema-faq-answer\">A First B Notice is usually the first notice sent to a payee when the name or Taxpayer Identification Number on file does not match IRS records. The payee is generally asked to complete and sign Form W-9. A Second B Notice is more serious and may happen when the same account has another mismatch within a three-calendar-year period. For a Second B Notice, the payer should not simply send another Form W-9. The payee may need to provide IRS or SSA validation.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778422711207\"><strong class=\"schema-faq-question\">What causes a B Notice?<\/strong> <p class=\"schema-faq-answer\">A B Notice is usually caused by a missing, incorrect, or mismatched Taxpayer Identification Number. Common causes include using a DBA instead of the legal name, typing the EIN or SSN incorrectly, using an outdated W-9, or filing a 1099 with incomplete vendor information.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778422727280\"><strong class=\"schema-faq-question\">Does a First B Notice require a new W-9?<\/strong> <p class=\"schema-faq-answer\">In most cases, yes. For a First B Notice, the payee is generally asked to provide a completed and signed Form W-9 with the correct legal name and Taxpayer Identification Number.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778422742322\"><strong class=\"schema-faq-question\">Does a Second B Notice require another W-9?<\/strong> <p class=\"schema-faq-answer\">No. A Second B Notice should not be handled by simply sending another Form W-9. IRS guidance says the Second B Notice should not include Form W-9. The payee may need to provide stronger verification, such as SSA or IRS validation of the correct name and TIN.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778422754275\"><strong class=\"schema-faq-question\">How quickly should a business respond to a CP2100 or CP2100A notice?<\/strong> <p class=\"schema-faq-answer\">Businesses should act quickly after receiving a CP2100 or CP2100A notice. IRS guidance generally gives payers 15 business days from the notice date, or the date received if later, to send the required B Notice to the payee.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778422779117\"><strong class=\"schema-faq-question\"><\/strong> <p class=\"schema-faq-answer\"><\/p> <\/div> <\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Simple_takeaway\"><\/span>Simple takeaway<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A First B Notice is usually the first warning that a payee\u2019s name and TIN may not match IRS records.<\/p>\n\n\n\n<p>A Second B Notice means the issue may have repeated. It is not handled the same way as the first notice. In many cases, another W-9 is not the right fix. The payee may need to provide IRS or SSA validation.<\/p>\n\n\n\n<p>That is why W-9 collection should not be treated as a January cleanup task.<\/p>\n\n\n\n<p>It should be part of vendor onboarding.<\/p>\n\n\n\n<p>GetW9 helps businesses request, collect, and store completed W-9s in one place, so teams are not relying on scattered emails, spreadsheets, and manual follow-ups when vendor data matters most.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A B Notice is not just another tax letter. It usually means the IRS found a problem with a payee\u2019s name or Taxpayer Identification Number, also called a TIN. This can happen when a business files an information return, such as a Form 1099, with a missing TIN, an obviously incorrect TIN, or a name\/TIN [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3964,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[155,39],"tags":[90,159,67,240,77],"class_list":["post-3962","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-backup-withholding","category-tax-compliance","tag-b-notice","tag-cp2100","tag-tin-matching","tag-vendor-data","tag-w-9"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>First B Notice vs Second B Notice: What Businesses Should Know<\/title>\n<meta name=\"description\" content=\"Learn the difference between a First B Notice and Second B Notice, what IRS CP2100\/CP2100A notices mean, 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