08/07/2026
Why LHDNM Made This Update
Comparing this against the earlier v4.5/v4.6 Guideline, this is a genuinely new addition — the field description has been substantively rewritten, not just reformatted.
In the old versions, the field simply read
"For businesses: Business registration number," with a footnote stating that SSM-registered taxpayers must use the new 12-digit BRN, and taxpayers registered with "other authority/body" must enter "the relevant registration number" — without specifying what that number is or how it should be obtained.
The blue text in v4.7 replaces that vague instruction with two concrete changes.
First, LHDNM formally defines "BRN" as a standardised term:
"the official registration number issued by the government, authorities or relevant bodies under which the taxpayer is registered, established or incorporated."
This broadens the field's scope beyond just SSM-registered companies — it now explicitly covers any government or statutory body that issues a registration number (cooperative societies, professional bodies, other regulators, etc.), with SSM's 12-digit format kept only as one illustrative example rather than the default assumption.
This brings consistency, since "BRN" as a defined term is now used identically across the Supplier's field, the Buyer's field (item 11), and the Shipping Recipient's field (Appendix 2) — a single definition governing all three parties instead of each section describing it slightly differently.
Second, and more importantly, LHDNM added an entirely new fallback provision:
"For taxpayers who does not possess a BRN, any identification number may be assigned by the IRBM as deemed appropriate."
This closes a real gap in the earlier guideline.
The old wording assumed every business supplier had either an SSM number or a registration number from "another authority" — it gave no answer for a supplier who has no formal registration number at all (for example, certain informal or micro businesses, some foreign suppliers, or entities operating without a statutory registration).
LHDNM is now addressing that scenario directly by giving IRBM discretion to assign a workable identification number.
Potential Impact
For system and API developers, the BRN field's validation logic needs to accommodate IRBM-assigned identification numbers, not just the fixed 12-digit SSM format — a supplier record could now legitimately carry a non-standard IRBM-issued number.
For businesses without a formal BRN — such as unregistered sole traders, certain professional practices, or foreign suppliers without local registration — this removes a previous ambiguity that could have caused rejected or inconsistent e-Invoice submissions; there is now a defined path to obtain a usable identifier from IRBM.
For all the accounting firms, this is particularly relevant when advising clients dealing with counterparties who fall outside SSM's registration net (foreign suppliers, individuals conducting business, or entities registered with non-SSM bodies) — the same defined "BRN" standard now applies consistently whether that counterparty appears as a Supplier, a Buyer, or a Shipping Recipient on the e-Invoice.
LHDNM为何作出此项更新
将此内容与早前的v4.5/v4.6版本指南比对后可确认，这确实是全新增加的内容，而非单纯的格式调整——该字段的说明文字经过了实质性改写。
旧版本中，该字段仅简单写明"企业：商业注册号码*"，并在附注中说明SSM注册的纳税人须使用新版12位数的BRN，而在"其他机构/团体"注册的纳税人则须输入"相关注册号码"——但并未具体说明该号码究竟是什么、应如何取得。
v4.7版本中的蓝色文字，将这段模糊的指示替换为两项具体变更。
第一，LHDNM正式将"BRN"定义为一个标准化术语：
"BRN是指纳税人注册、设立或成立所依据的政府、机关或相关机构所核发的官方注册号码。"
这将该字段的适用范围扩大到不仅限于SSM注册的公司——现在明确涵盖任何核发注册号码的政府或法定机构（例如合作社、专业团体、其他监管机构等），而SSM的12位数格式仅作为其中一个示例，而非默认假设。
这样一来，"BRN"作为一个统一定义的术语，如今在供应商字段、买方字段（第11项）以及收货人字段（附录2）中的用法完全一致——由单一定义统一规范三方，而不是每个部分各自略有不同的描述。
第二点也更为重要，LHDNM新增了一项此前完全不存在的兜底条款："对于没有BRN的纳税人，IRBM可视情况指定分配一个识别号码。"
这填补了旧版指南中一个实际存在的漏洞。
旧的措辞假设每一个企业供应商都持有SSM号码，或从"其他机构"取得的注册号码——但对于完全没有任何正式注册号码的供应商（例如某些非正式或微型企业、部分外国供应商，或未经法定注册的实体），旧版并未提供任何解决方案。
LHDNM如今直接针对这一情况作出规定，赋予IRBM酌情分配可用识别号码的权限。
潜在影响
对系统与API开发人员而言，BRN字段的验证逻辑需要调整，以支持IRBM分配的识别号码，而不仅限于固定的12位数SSM格式——供应商记录如今可能合法地带有一个非标准的、由IRBM核发的号码。
对于没有正式BRN的企业——例如未注册的个体商户、部分专业执业者，或没有本地注册的外国供应商——这项更新消除了此前的模糊地带，避免因此导致电子发票提交被拒或资料不一致；现在有了明确途径可向IRBM取得可用的识别号码。
对会计事务所而言，这一点在为客户处理不属于SSM注册范围的交易对手（例如外国供应商、以个人身份从事商业活动者，或在非SSM机构注册的实体）时尤为重要——无论该交易对手在电子发票上是作为供应商、买方，还是收货人，如今都适用同一套统一定义的"BRN"标准。
