Mr. Chen, a client of Qi Cai Ying, had originally decided to register for an RFC tax ID on his own. He searched online for ”How to register for an RFC in Mexico,” looked at some tutorials, and concluded that the process wasn’t too complicated—after all, wasn’t it just a matter of filling out a form on the SAT website? So he began preparing the required documents and submitted his application.

My first submission was rejected. The reason given was that ”the articles of incorporation had not been notarized and authenticated in Mexico.”

This was the second submission, and it was rejected. The reason given was ”the proof of tax registration address was non-compliant.”

This was the third submission, and it was rejected again. The reason given was that ”the activity code classification on the RFC registration application form did not match the actual business operations.”

After three rounds of submissions—a process that dragged on for 45 days—the RFC still hadn’t been issued. General Manager Chen realized that Mexico’s tax registration system was far more complex than the online tutorials described—those tutorials covered only the most basic procedures, while the details that were most prone to errors were scarcely mentioned in any Chinese-language resources.

In the end, Mr. Chen turned to Qicaiying, and the entire process—from preparing the materials to receiving the RFC number—was completed in 20 days.

What pitfalls did we run into during these 45 days of detours? Today, we’ll break them down one by one.

跨境电商采购、物流、报关、平台订单、海外仓、境外收款、对外付汇、出口退税……每一个环节，都可能成为税务核查时的证据链。
Cross-border sellers—especially those who operate through multiple entities, use overseas warehouses, settle transactions through overseas companies, and rely on overseas logistics services on a long-term basis—need to re-examine their business operations.

老周（化名）做美客多墨西哥站跨境店快两年了，生意不算大，月销差不多10万比索。每次看月度账单，他都会盯着“预扣税”那一栏皱眉头——平台直接扣走了36%，一个月3.6万比索，一年下来四十多万比索就这么没了。

他在卖家群里问了一圈，有人说“注册RFC就能退”，有人说“退不了，那就是墨西哥的税”。越问越糊涂。

老周的困惑不是个例。大量做美客多墨西哥站的跨境卖家，每个月被预扣36%的税，但很少有人真正搞明白这笔税的来龙去脉——它到底是什么税、能不能退、怎么退、退多少。

2026年8月1日，全国数电票全面推广进入新阶段——多地税务局发布通告，正式取消增值税普通发票（纸质）和增值税专用发票（税控盘开具）的并行通道，企业必须通过电子发票服务平台开具数电票。这意味着沿用了近三十年的税控盘、UKey等物理介质即将彻底退出历史舞台。更关键的变化在于：数电票开具后，不再支持”作废”操作，开错发票只能通过红字发票冲红处理。而红冲规则本身也发生了根本性变化——购方必须在收到红字发

The year 2026 is referred to by the industry as the ”first year of financial and tax regulation for cross-border e-commerce.” With the full rollout of the Golden Tax Phase IV system, data from multiple departments—including industry and commerce, tax authorities, banks, social security, customs, and payment service providers—has been fully integrated across the entire chain. This means that the ”information asymmetry” moat on which cross-border e-commerce sellers once relied has been completely leveled—sales data from overseas warehouses, foreign exchange remittance routes, bank transaction details, and social security payment records are all now within the scope of tax supervision. An even more significant change is that tax authorities in many regions have officially announced the complete elimination of fixed-rate taxation for sellers operating under the overseas warehouse model, replacing it with examination-based taxation. This means that the long-standing ”