It takes a Herculean effort to open a bank account in the U.S., only to receive an IRS notice or a bank freeze notice three months later—and this is not an isolated case. A FinCEN report shows that in 2025, approximately 12% of U.S. bank accounts held by nonresidents triggered a compliance review at least once a year, an increase of 4 percentage points from 2023.

With Hong Kong bank accounts, the concern is that they might be closed due to risk control measures. With U.S. bank accounts, the concern is thatThree Parties Have Set Their Sights on You at the Same Time—The IRS looks at your bank statements, FinCEN looks at your beneficial owners, and OFAC looks at your counterparties.

This article provides a long-term maintenance guide for U.S. accounts, covering four key areas: five ironclad rules for maintenance, the IRS tax coordination mechanism, emergency procedures for account freezes, and a multi-pronged strategy.

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I. Five Golden Rules for Account Management

There are five core rules for maintaining a U.S. bank account, each of which corresponds to specific procedures and the consequences of noncompliance.

1. Prohibition of Structuring Transactions
   Here’s how it works: When your cumulative daily transaction volume reaches $10,000, do not deliberately split it into multiple transactions of $9,000 each to circumvent CTR reporting requirements. Violating this rule can result in being flagged by FinCEN, an IRS audit, and federal felony charges, punishable by up to five years in prison and a $250,000 fine.
2. Maintain a reasonable trading frequency and amount.Specifically, you should maintain 5 to 15 transactions per month, with amounts commensurate with the scale of your business. If a single transaction of one million is deposited and then the full amount is withdrawn on the same day, the AML system will immediately freeze the account.
3. The counterparty for the transfer is stable and registered.Specifically, the payee’s information must be registered with the bank through online banking, and the bank must be notified in advance of any frequent changes. Frequent transfers to unknown accounts may trigger a SAR (Suspicious Activity Report), which could lead to a FinCEN investigation.
4. Reasonable Allocation of Existing Funds
   Specifically, you should maintain the base balance declared when opening the account, and transfer any excess funds to a savings account or CD. If the balance suddenly increases by 3,001 TP3T in the short term, the bank will require you to undergo a KYC review again.
5. Update KYC and BOI annually
   The specific tasks involve filing the U.S. company’s annual report, verifying the validity of the EIN, and updating the beneficial owner information with the BOI. Failure to update the BOI information within 30 days will result in a daily fine of $500 and criminal liability.

Why Is Structuring the Most Dangerous?

Many sellers instinctively think, “If I split a single-day payment of $50,000 into six payments of $8,300, it won’t be reported.” This is precisely the number one target of U.S. anti-money laundering laws. Section 5324 of Title 31 of the United States Code explicitly classifies “structured transactions to evade reporting” as a federal felony. The IRS and FinCEN have specialized AI models that scan for this pattern, with an extremely high detection rate.

II. IRS Tax Coordination—The Unique Characteristics of U.S. Accounts

This is the most fundamental difference between U.S. bank accounts and Hong Kong bank accounts:Your U.S. account serves as the IRS's “tax portal.”

Why Can the IRS See Your Account? Three Levels of Data Channels:

The first layer is that when you opened your bank account, you provided your EIN, which the IRS links directly to your account. The IRS can access every transaction in your account.

The second layer involves FATCA (Foreign Account Tax Compliance Act), which requires financial institutions worldwide to report information on U.S. taxpayers’ accounts to the IRS. If the transaction volume of your affiliated companies within China meets the threshold, it will also come under the IRS’s scrutiny.

The third layer involves China’s Order No. 810, which requires foreign platforms to submit data to tax authorities. The Chinese tax authorities have a copy of your sales on Amazon and Walmart, and through the CRS information exchange, the IRS also has a copy.

As a result, the IRS has access to your bank statements in the U.S., the bank statements of your affiliated companies in China, and your sales data from e-commerce platforms. When these three sets of data are cross-checked, any discrepancies will trigger an audit.

Three Common Scenarios That Trigger IRS Audits

Against this backdrop, there are three common scenarios that trigger an IRS audit.

1. Annual income exceeding $500,000 but no tax return filed The IRS focuses on cases where it directly presumes an intent to evade taxes and initiates an audit. To prevent this, ensure that a U.S. accountant prepares your year-end financial statements and files your tax return properly using Form 5472 (for foreign-owned LLCs) or Form 1120 (for C corporations), depending on your company type.
2. There is a significant discrepancy between the account balance and the reported income.
   For example, if an account balance is $1 million but reported income is only $100,000, the IRS will initiate a net worth audit. To prevent this, ensure that the balance equals accumulated profits plus capital contributions, minus dividends and expenses, and reconcile the accounts quarterly to ensure they balance.
3. Frequent Large-Amount Transactions with Related Parties (Between U.S. and Chinese Companies)
   The IRS is concerned with whether transfer pricing through related-party transactions is being used to evade U.S. taxes. To mitigate this risk, you should retain all related-party transaction contracts, pricing explanations, and transfer pricing documentation.

Recent Changes to Form 1099-K and Common Misconceptions

The $600 rule was repealed in 2026, and the current threshold has reverted to $20,000 and more than 200 transactions.But that doesn't mean small sellers don't have to file taxes.——The 1099-K threshold refers to the “platform’s reporting obligation,” not “your filing obligation.” If you have an EIN, a bank account, and have received payments, you must file a tax return—even if the amount is less than $20,000.

📞 Not sure about your IRS filing obligations? Feel free to contact Qicaiying for a one-on-one tax compliance assessment. Just send 【IRS Filing】.

III. Three Scenarios in Which Accounts May Be Frozen and How to Handle Them

Having an account frozen in the U.S. is more complicated than in Hong Kong. The freeze notice is usually just an email stating that “account activity has been restricted,” without specifying the reason, and the process to unfreeze the account takes much longer than in Hong Kong.

1. AML Compliance Freeze
   Typical triggers include large-scale quick-in, quick-out transactions, risks associated with counterparties, and triggering of structuring patterns. The emergency response consists of three steps: First, immediately contact your account manager to request a “written notice of the reason for the freeze.” Second, prepare a complete set of transaction documentation, including contracts, invoices, shipping documents, a statement of funds’ origin, and screenshots of the platform’s backend showing the relevant time periods. Third, if there are related-party transactions within China, simultaneously provide proof of the affiliated companies. The unfreezing process typically takes 4 to 8 weeks.
2. IRS Tax Levy
   Common triggers include unpaid taxes, failure to file a tax return, and significant discrepancies in the tax return. The emergency response consists of three steps: First, confirm the IRS Notice number and log in to the IRS website to verify it. Step 2: Contact a U.S. accountant to file the missing tax returns, pay the outstanding taxes in full, and apply to have the levy lifted. Step 3: After the IRS lifts the levy, submit the Certificate of Release to the bank. The account will be unfrozen within 1 to 2 weeks after the taxes are paid in full.
3. FinCEN/OFAC Investigation and Freeze
   Common triggers include being added to a sanctions list, money laundering investigations, and serious violations of BOI reporting requirements. In such cases, legal representation is essential: First, do not contact the bank on your own. Second, have a U.S. attorney determine the reason for the investigation and prepare the necessary clearance documentation. Third, keep all accounts inactive during the investigation and do not conduct any new transactions. The process of lifting the freeze typically takes 8 to 12 weeks or longer.

The Most Important Emergency Principles: Do not transfer funds to the frozen account while it is frozen. Do not attempt to contact multiple bank departments, as this may trigger a “suspicious activity” flag. Do not delete any transaction records or emails. Follow this clear procedure: account manager → attorney (if necessary) → submit additional documentation → wait.

IV. Multi-Bank Account Strategy—Similar to the Approach in Hong Kong, but for Different Reasons

In Hong Kong, the practice of using multiple banks is intended to prevent the closure of a single bank from disrupting cash flow. In the United States, in addition to the same reason, there is another, more pressing rationale:Prevent all funds from being frozen due to an IRS/FinCEN freeze.

There’s no such thing as an IRS levy that “leaves some funds for you”—a freeze means everything is frozen. If all your funds are in a single account, your business will come to a standstill during the freeze. Diversifying across multiple accounts can limit the impact to 50–60% of your total funds.

There are two important points to note when opening a multi-line account.

First, do not open multiple bank accounts at the same time; wait at least two months between each one to avoid being flagged by ChexSystems.

Second, the money in your tax reserve account is not “available funds,” but rather an “account payable” between you and the IRS. Many sellers find themselves short on funds to pay their taxes at the end of the year precisely because they haven’t set this aside.

V. A Framework for Ongoing Compliance

Ensuring compliance with U.S. bank account regulations is, at its core, a process of “four-dimensional alignment”:

If any one aspect falls short, it could be passed on to the bank, triggering an audit or account freeze. This is not a “set it and forget it” task, but rather an ongoing compliance effort.

The IRS has a copy of every transaction in your U.S. bank account. The bottom line for maintaining an account isn’t simply “not getting shut down by the bank,” but rather “ensuring that the bank, the IRS, and FinCEN all agree that you’re in good standing.”

If you have any questions, please feel free to contact Qicaiying Customer Service:

Enterprise Finance Group

Founded in 2015 and headquartered in Shenzhen, Qicaiying Group is a leading provider of corporate services and tax compliance solutions in China.

The Group is deeply committed to providing services across the entire corporate lifecycle. Its core business areas include: business registration, bookkeeping services, tax compliance, overseas company registration (Hong Kong, the U.S., Singapore, Mexico, etc.), cross-border structuring, outbound direct investment (ODI) filing, overseas tax planning, bank account opening assistance, and identity planning.

Over the past decade, Qicaiying has served more than 10,000 corporate clients and has accumulated solid practical experience in key areas such as corporate structuring in Hong Kong and overseas, cross-border tax and financial compliance, and corporate accounting management. The Group boasts a team of seasoned financial and tax advisors who closely monitor changes in domestic and international tax systems and regulatory trends, providing clients with one-stop solutions ranging from structural planning to implementation.