{"id":3844,"date":"2025-11-08T08:23:50","date_gmt":"2025-11-08T08:23:50","guid":{"rendered":"https:\/\/getw9.tax\/blog\/?p=3844"},"modified":"2025-11-08T08:23:51","modified_gmt":"2025-11-08T08:23:51","slug":"cp2100-b-notice-backup-withholding-checklist","status":"publish","type":"post","link":"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/","title":{"rendered":"CP2100\/CP2100A &amp; \u201cB\u201d Notices: Your 15-Day and 30-Day Action Plan"},"content":{"rendered":"\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\/cp2100-b-notice-backup-withholding-checklist\/#What_this_notice_means\" >What this notice means<\/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\/cp2100-b-notice-backup-withholding-checklist\/#The_plan_at_a_glance\" >The plan at a glance<\/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\/cp2100-b-notice-backup-withholding-checklist\/#Step-by-step_plain_language\" >Step-by-step (plain language)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/#1_Match_the_IRS_list_to_your_records_Day_0%E2%80%932\" >1) Match the IRS list to your records (Day 0\u20132)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/#2_Send_the_right_B_Notice_by_Day_15_business_days\" >2) Send the right B Notice (by Day 15  business days)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/#3_Beginstop_backup_withholding_by_Day_30_business_days\" >3) Begin\/stop backup withholding (by Day 30 business days)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/#4_If_mail_comes_back_%E2%80%9Cundeliverable%E2%80%9D\" >4) If mail comes back \u201cundeliverable\u201d<\/a><\/li><\/ul><\/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\/cp2100-b-notice-backup-withholding-checklist\/#Annual_TIN_solicitations_so_you_avoid_penalties\" >Annual TIN solicitations (so you avoid penalties)<\/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\/cp2100-b-notice-backup-withholding-checklist\/#Quick_FAQ\" >Quick FAQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/#How_to_reduce_CP2100s_next_season_and_stress\" >How to reduce CP2100s next season (and stress)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/#Disclaimer\" >Disclaimer<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/#Sources\" >Sources<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_this_notice_means\"><\/span>What this notice means <span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A <strong>CP2100 or CP2100A<\/strong> notice means the IRS found some 1099s with <strong>missing<\/strong> or <strong>incorrect<\/strong> Name\/TIN details. You compare the IRS list to your vendor list, then take action. The IRS sends <strong>CP2100<\/strong> when there are <strong>50+<\/strong> returns with errors and <strong>CP2100A<\/strong> when there are <strong>&lt;50<\/strong> the steps are the same. <a href=\"https:\/\/www.irs.gov\/individuals\/understanding-your-cp2100-or-cp2100a-notice\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/p>\n\n\n\n<p>If a TIN is <strong>missing<\/strong> or <strong>obviously wrong<\/strong> (not 9 digits or not numbers), <strong>begin backup withholding right away<\/strong> while you ask for the TIN. <a href=\"https:\/\/www.irs.gov\/individuals\/understanding-your-cp2100-or-cp2100a-notice\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_plan_at_a_glance\"><\/span>The plan at a glance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Within 15 business days:<\/strong> send the correct <strong>\u201cB\u201d Notice<\/strong><br>\u2013 <strong>First B Notice<\/strong> (include <strong>Form W-9<\/strong>) if this is the first time in 3 years for that account<br>\u2013 <strong>Second B Notice<\/strong> (<strong>no W-9<\/strong>) if you\u2019ve received a second notice for the same account within 3 years<br>\u2013 Mark the envelope: <strong>\u201cIMPORTANT TAX INFORMATION ENCLOSED\u201d<\/strong> (or <strong>\u201cIMPORTANT TAX RETURN DOCUMENT ENCLOSED\u201d<\/strong>) <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n\n\n\n<li><strong>By 30 business days:<\/strong> if no response, <strong>start backup withholding<\/strong> on payments to that payee (you may start sooner).<br>\u2013 Current rate: <strong>24%<\/strong><br>\u2013 When they send what\u2019s required, <strong>stop within 30 calendar days<\/strong> (W-9 for First B; SSA\/IRS validation for Second B). <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS+1<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step-by-step_plain_language\"><\/span>Step-by-step (plain language)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Match_the_IRS_list_to_your_records_Day_0%E2%80%932\"><\/span>1) Match the IRS list to your records (Day 0\u20132)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sort vendors into <strong>Missing TIN<\/strong> vs <strong>Incorrect TIN<\/strong>.<\/li>\n\n\n\n<li>If the issue was <strong>your typo<\/strong>, just fix your records\u2014<strong>do not<\/strong> send a B Notice. <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Send_the_right_B_Notice_by_Day_15_business_days\"><\/span>2) Send the right B Notice (by Day 15  business days)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>First B Notice<\/strong>: send within <strong>15 business days<\/strong> and <strong>include Form W-9<\/strong>. Envelope must show the required wording above. <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n\n\n\n<li><strong>Second B Notice<\/strong>: send within <strong>15 business days<\/strong> but <strong>do not<\/strong> include a W-9. The payee must get <strong>SSA\/IRS validation<\/strong> (e.g., SSN card or <strong>IRS Letter 147C<\/strong>). <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n\n\n\n<li>If you receive two CP2100\/CP2100A notices <strong>in the same calendar year<\/strong>, you <strong>don\u2019t<\/strong> have to mail a Second B Notice. Track which one is first vs second for each account. <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Beginstop_backup_withholding_by_Day_30_business_days\"><\/span>3) Begin\/stop backup withholding (by Day 30 business days)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If the payee doesn\u2019t respond in time, <strong>start backup withholding<\/strong> <strong>no later than 30 business days<\/strong> after you got the notice (you can start earlier).<\/li>\n\n\n\n<li><strong>Rate is 24%<\/strong>. <strong>Stop<\/strong> within <strong>30 calendar days<\/strong> after you receive a valid <strong>W-9<\/strong> (first notice) or <strong>SSA\/IRS validation<\/strong> (second notice). <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS+1<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_If_mail_comes_back_%E2%80%9Cundeliverable%E2%80%9D\"><\/span>4) If mail comes back \u201cundeliverable\u201d<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Begin backup withholding<\/strong>, try to get the correct address, and <strong>keep the returned mail for 3 years<\/strong> to track the \u201ctwo-in-three-year\u201d rule. <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Annual_TIN_solicitations_so_you_avoid_penalties\"><\/span>Annual TIN solicitations (so you avoid penalties)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Missing TINs<\/strong>:<br>\u2013 Ask at onboarding\/transaction (<strong>initial<\/strong>)<br>\u2013 <strong>First annual<\/strong> by <strong>Dec 31<\/strong> (or <strong>Jan 31<\/strong> if the account opened the prior December)<br>\u2013 <strong>Second annual<\/strong> by <strong>Dec 31<\/strong> of the next year if still missing <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n\n\n\n<li><strong>Incorrect TINs<\/strong>:<br>\u2013 Sending a <strong>B Notice<\/strong> on time <strong>counts<\/strong> as the annual solicitation for penalty relief on that return. <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n<\/ul>\n\n\n\n<p>For penalty relief based on <strong>reasonable cause<\/strong> (you acted responsibly, had mitigating factors, etc.), see <strong>Publication 1586<\/strong>. <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1586.pdf?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quick_FAQ\"><\/span>Quick FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>When does the IRS send these notices?<\/strong><br>Typically <strong>twice a year<\/strong> <strong>October<\/strong> and the following <strong>April<\/strong>. <a href=\"https:\/\/www.irs.gov\/individuals\/understanding-your-cp2100-or-cp2100a-notice\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/p>\n\n\n\n<p><strong>What\u2019s the difference between CP2100 and CP2100A?<\/strong><br>Only the <strong>number of returns with errors<\/strong>: CP2100 (50+), CP2100A (&lt;50). Steps are the same. <a href=\"https:\/\/www.irs.gov\/individuals\/understanding-your-cp2100-or-cp2100a-notice\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/p>\n\n\n\n<p><strong>What payments are subject to backup withholding?<\/strong><br>Many 1099-type payments can be subject if a TIN is missing\/incorrect or the IRS instructs you to withhold. <strong>Rate is 24%<\/strong>. <a href=\"https:\/\/www.irs.gov\/businesses\/small-businesses-self-employed\/backup-withholding?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">IRS+1<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_reduce_CP2100s_next_season_and_stress\"><\/span>How to reduce CP2100s next season (and stress)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Collect W-9s upfront<\/strong> with automatic reminders.<\/li>\n\n\n\n<li><strong>Save W-9 PDFs with a submission history<\/strong> (tamper-evident record).<\/li>\n\n\n\n<li><strong>Optional:<\/strong> If you use QuickBooks, connect it to auto-import vendors.<\/li>\n\n\n\n<li>Use <strong>USPS Address Validation<\/strong> to cut returned mail; watch <strong>audit-trail flags<\/strong> for early fixes.<\/li>\n\n\n\n<li>Keep clean exports for smooth 1099 prep.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>With <strong>GetW9<\/strong>, this is turnkey: fewer notices, less chasing, better records.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Disclaimer\"><\/span>Disclaimer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>This article is informational and not tax or legal advice. Please consult your CPA for guidance on your situation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sources\"><\/span>Sources<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IRS: <strong>Understanding your CP2100\/CP2100A Notice<\/strong> (what it is, timing, differences, 24% reference). <a href=\"https:\/\/www.irs.gov\/individuals\/understanding-your-cp2100-or-cp2100a-notice\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n\n\n\n<li>IRS: <strong>Publication 1281<\/strong> (15-day B-Notice, envelope wording, 30-day start\/stop, annual solicitation &amp; tracking). <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1281.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n\n\n\n<li>IRS: <strong>Backup Withholding<\/strong> (current <strong>24%<\/strong> rate + overview) and <strong>Topic 307<\/strong>. <a href=\"https:\/\/www.irs.gov\/businesses\/small-businesses-self-employed\/backup-withholding?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">IRS+1<\/a><\/li>\n\n\n\n<li>IRS: <strong>Publication 1586<\/strong> (reasonable-cause penalty relief). <a href=\"https:\/\/www.irs.gov\/pub\/irs-pdf\/p1586.pdf?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">IRS<\/a><\/li>\n<\/ul>\n\n\n\n<p>Avoid CP2100 headaches next season <strong>automate W-9 collection with GetW9<\/strong>: requests, reminders, USPS-validated addresses, and tamper-evident W-9 PDFs with a submission history. <strong><a href=\"https:\/\/getw9.tax\/?utm_source=blog&amp;utm_medium=blog_article&amp;utm_campaign=blog#pricing\">Start free \u2192 getw9.tax<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What this notice means A CP2100 or CP2100A notice means the IRS found some 1099s with missing or incorrect Name\/TIN details. You compare the IRS list to your vendor list, then take action. The IRS sends CP2100 when there are 50+ returns with errors and CP2100A when there are &lt;50 the steps are the same. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3846,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[215,216,39],"tags":[225,222,218,62,159,217,219,223,224,220,133,221,77],"class_list":["post-3844","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-information-returns-1099","category-irs-notices-backup-withholding","category-tax-compliance","tag-24-rate","tag-972cg","tag-b-notice-2","tag-backup-withholding","tag-cp2100","tag-cp2100a","tag-first-b-notice","tag-publication-1281","tag-publication-1586","tag-second-b-notice","tag-tin","tag-tin-solicitation","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>CP2100\/CP2100A &amp; B Notices: What to Do Now<\/title>\n<meta name=\"description\" content=\"Got a CP2100\/CP2100A? Use this simple 15-day and 30-day plan for B-Notices and backup withholding and learn how to prevent notices next year.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/getw9.tax\/blog\/cp2100-b-notice-backup-withholding-checklist\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CP2100\/CP2100A &amp; B Notices: What to Do Now\" \/>\n<meta property=\"og:description\" content=\"Got a CP2100\/CP2100A? 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