• Seems to be called Taxpayer's Identification Number (TIN), and is 12 digits long according to http://bdlaws.minlaw.gov.bd/act-672/section-34615.html
• Sometimes referred to a Electronic Taxpayer's Identification Number (e-TIN)
• https://www.incometax.gov.bd/TINHome
• https://royandassociates.com.bd/how-to-register-for-e-tin-certificate-in-bangladesh/

  Tin means Tax Identification Number or Taxpayers Identification Number (Tin). Through a Tin Number a tax payer can be easily identified. It’s a 12 digit Number. National Board of Revenue, Bangladesh (NBR) is the authority who provide the Tin Certificate to the Tax Payers. Previously Tin Certificate was issued by NBR only through manual system and it was a 10 digit Number. Thereafter to speed up the whole process NBR has introduced an online system for obtaining Tin Certificate, which is known as e-Tin Certificate.

• https://unb.com.bd/category/Bangladesh/e-tin-online-registration-process-in-bangladesh/102907
• https://tin-check.com/en/bangladesh/

  The TIN consists of 10/12 digits

  • When looking for examples, when a TIN of 10 digits shows up it is usually besides its 12 digit e-TIN. The 10 digit TIN seems to be an older incarnation.
• It is 12 digits long according to https://pocl.portal.gov.bd/sites/default/files/files/pocl.portal.gov.bd/page/1f5f9eb9_aa22_4791_88ad_b1d6d48e53e4/ETIN_CERTIFICATE0001.pdf

Examples:

• 224187378587 from https://cevappealkhulna.gov.bd/uploads/citizen-charter/nbr_tin_certificate_224187378587.pdf
• 135055865054 from https://www.ificbank.com.bd/aboutus
• 738330325591 from https://aird.com.bd/aird-legal-entities/
• 277916626006 from https://www.sdnf.org.bd/sdnf_isp/
• 681988811545 from https://cse.buet.ac.bd/common/files/29-cseofficescan0003.pdf
• 267962119864 from https://www.cddl.gov.bd/file/certificate/2022/TIN%20Certificate.pdf
• 339698563430 from https://training.ossbscic.gov.bd/uploads/serviceForms/tin.pdf
• 520540168296 from http://services.nu.edu.bd/nu-app/upload/examination/36736/TIN.pdf
• 165536913384 from http://www.alphatech.com.bd/wp-content/uploads/2018/04/2.-Alpha-eTIN-Certificate_2017.pdf
• 316174170274 from https://www.cevrajshahi.gov.bd/files/citizen_info_content/17931532504192.pdf
• 131551835650 from http://badc.gov.bd/sites/default/files/files/badc.portal.gov.bd/go_ultimate/f8259d38_34ff_41a6_97cc_2c146d52e681/2020-02-17-14-45-f6d4fcc52475d9e848365b95b53cea01.pdf
• 481375629149 from https://gmarket.com.bd/users/registration
• 767520992761 from http://pbs.thakurgaon.gov.bd/site/files/d27f9cdc-30ce-4242-8577-3052fdc65609/PBS-TIN-Certificate
• 651069864924 from https://www.ieatery.com.bd/company-profile/TIN_Certificate.pdf
• 183780859375 from https://www.gus.org.bd/images/policy/3__nbr_tin_certificate_183780859375(2)GUS.pdf
• 532529995018 from https://evomart.com.bd/wp-content/uploads/2022/04/[email protected]
• 176564302526 from ftp://ho.aranya.com.bd/Aranya-NAS/AJIT/Essential%20product%20Vendor%20details/Neo-farmers%20Product%20list/Docouments/Tin_certificate_Ltd.pdf
• 832273574406 from https://shop.alpha.net.bd/image/tin.pdf
• 637043541293 from https://rupalibank.com.bd/corporate_profile.php
• 653402788766 from https://www.iu.ac.bd/public/images/teacher/ab2657a2c8182d989c7965836eea0d14.pdf
• 259574727994 from https://www.icc.com.bd/about
• 160874128026 from https://berc.portal.gov.bd/sites/default/files/files/berc.portal.gov.bd/page/ebe71a3b_fffe_41a6_812e_58d08c95fa5f/2021-09-22-09-19-944a53d2d52ff5aa15b3510d89de76f7.pdf
• 284120567875 from http://www.supremecourt.gov.bd/resources/bulletin/11_SCOB_HD_8.pdf
• 193190124102 from https://basis.org.bd/public/files/company_profile/5ff7084be3cbc__Voltsmith%20_Company%20Profile%20dated%2016%20DEC%202020.pdf
• 431261923476 from https://www.cse.com.bd/upload_ipo/2b2031cd50e16d3df6a743cb136a866b.pdf
• http://www.icml.com.bd/draft_prospectus_of_amulet_pharmaceuticals_ltd.pdf

  646693455577
  166768321166
  777596901240
  414877819850
  635337482532
  619068451149
  723377852860
  570789269501

• 165536913384 from http://www.alphatech.com.bd/wp-content/uploads/2018/04/2.-Alpha-eTIN-Certificate_2017.pdf
• 365777579468 from https://www.siloti.com.bd/about
• 797905950605 from https://ebook.com.bd/copyright_policy
• 295475338492 from https://training.ossbscic.gov.bd/uploads/serviceForms/etin.pdf
• 439442745537 from https://sec.gov.bd/ipoprospectus/SHASHA_DENIMS_LTD..pdf
• A couple dozen examples at https://cse.buet.ac.bd/common/files/19-cseofficescan0003.pdf (attached here just in case)
• 164533974718 from https://www.linkhost.com.bd/terms-conditions/
• 118701528309 from https://carnival.com.bd/company-doc/
• http://www.supremecourt.gov.bd/resources/bulletin/8_SCOB_HD_9.pdf

  129369223588
  114403298089
  198060384543
  661881651462
  757699520135
  350175670404
  544218590837
  639216748212
  350175670404
  727126527155

• 738330325591 from https://aird.com.bd/aird-legal-entities/
• 694411411108 from https://oberon.com.bd/workshop/
• Hundreds of examples at https://nbr.gov.bd/uploads/irc/IRC.pdf (attached here just in case). Copied here only the first page of them:

  344847223347
  394777319395
  193602721035
  443583654331
  123562770715
  581975497462
  172342737380
  427058738130
  621606361842
  836773433583
  723775721753
  229193339950
  518389342914
  599652154463
  499508441184
  854716207710
  827328109457
  530068670685
  448245442372
  185171632448
  150261504838
  441133295537
  314917396858

• 446381915223 from https://sterlinggroup.com.bd/assets/Profile_Unicorn%20Sweater%20Ltd.pdf
• 834323463643 from http://www.gshs.edu.bd/view_teacher.php?id=1328
• 232954564554 from https://www.aegis.com.bd/pages_detail.php?id=2
• 453961956038 from http://www.pegasus.com.bd/product-detail/26
• 592394697235 from https://dpdc.org.bd/library/document/Billing_Cycle_Schedules/bill_schedule_feb171491106512.pdf
• 320623792282 from https://ssl.du.ac.bd/fontView/assets/faculty_cv/cv_2584.pdf
• 272768451190 from https://www.piarabazar.com.bd/product/3-in-1-manual-can-openers-cordless-tin-opener-with-lids-off-jar-opener-4hlce
• 277916626006 from https://www.sdnf.org.bd/sdnf_isp/
• 431117397300 from https://basis.org.bd/public/files/company_profile/fff4a73fc3895296b691b0fd4b9708ee-16032022034107.pdf
• 161231359425 from https://systembuilder.com.bd/about-us
• 134518668890 from https://www.cbc.gov.bd/images/Handicraft.pdf
• 160951299512 from https://kodu.com.bd/Tin-Number
• 132006154756 from https://www.bestaid.com.bd/
• 181118834634 from http://axisint.com.bd/about/
• 297396592589 from https://www.saffroncorporation.com.bd/UserFile/AttachFile/CompanyProfile/20210704092706Saffron_Corporation_Ltd_-_Company_Profile.pdf
• 473613974848 from https://gem.com.bd/about-us/
• 333983392178 from http://www.holoplus.com.bd/
• 465337943663 from https://www.sonalibank.com.bd/PDF_file/annualreport/2018/annual_report_2017.pdf
• 286937923024 from http://smhgroup.com.bd/wp-content/uploads/2014/12/SMH-Engg-Ltd-Profile.pdf
• 496902985207 from https://www.tradebangla.com.bd/business/dialmelimited
• 143462765792 from http://suspace.su.edu.bd/bitstream/handle/123456789/252/Internship%20Report%20BBA1801013111%20md%20shajadur%20rahaman%20akash.pdf?sequence=1&isAllowed=y
• 763686958372 from https://www.gpit.com.bd/GPIT-Tax-Identification-Number-(TIN)
• 864865842903 from http://www.firetech.com.bd/license.php
• 630477546927 from http://dspace.bracu.ac.bd/xmlui/bitstream/handle/10361/13805/11104042_BBA.pdf?sequence=1
• 144050147394 from http://dspace.daffodilvarsity.edu.bd:8080/bitstream/handle/123456789/4711/162-11-338%2033%25.pdf?sequence=1&isAllowed=y
• 481375629149 from https://gmarket.com.bd/category/garments_accessories
• 733743131344 from https://sherpurit.com.bd/pdf/nbr-tin-certificate.pdf
• 768947979306 from http://badc.portal.gov.bd/sites/default/files/files/badc.portal.gov.bd/page/17ad9481_b7f7_44f7_91c4_5efbc5b223db/2331.pdf
• 457158218470 from https://www.badc.gov.bd/sites/default/files/files/badc.portal.gov.bd/go_ultimate/1468bb4b_d447_4e84_8af8_36dd64b93a7d/1083.pdf
• 820797987002 from https://mofood.gov.bd/sites/default/files/files/mofood.portal.gov.bd/notices/6d8a6d29_8bb3_471f_a6c1_d9c4b3f7c282/nothi_81_2021_09_26_81632633208.pdf
• 299334919055 from https://nameage.comillaboard.gov.bd/documents/name/0034264936f19bac40ff62d2cea47b34.pdf
• 149986200224 from https://www.teachers.gov.bd/shared//images/achievement/e8zyaQ4Voe15rW9Q2YprOfFfmGuMsQC96hAZjCkK.jpeg