If you are an international seller moving goods or services into the United States, the landscape has shifted beneath your feet in early 2026. The IRS and federal authorities have introduced a wave of updates that prioritize real-time data transparency and increased import surcharges.
Operating in the US market used to allow for a "wait and see" approach regarding compliance. In 2026, that luxury is gone. From AI-driven audit algorithms to new federal remittance fees, staying compliant is no longer just about avoiding fines, it is about protecting your profit margins.
At Sterlinx Global, we manage daily compliance for digital brands and fast-growing SMEs. Here are the 10 most critical USA tax updates you need to understand right now to keep your international business running smoothly.
1. The New Section 122 Import Surcharge is Active
As of February 24, 2026, a mandatory 10% surcharge applies to the majority of goods imported into the US. This "Section 122" surcharge replaces many of the legacy IEEPA tariffs and is currently projected to escalate to 15% later this year.
This is not a standalone fee. It stacks on top of existing Section 232 (steel and aluminum) and Section 301 (China-specific) tariffs. If your landed cost calculations haven’t been updated since January, you are likely underpricing your products. You must verify with your customs broker that legacy codes are removed to avoid double-taxation.
2. Federal Remittance Fees on Profit Repatriation
Starting January 1, 2026, the US introduced a 1% federal fee on certain international remittances. If you are a non-US founder moving profits from a US entity back to your home country, this fee could take a bite out of every transfer.
To mitigate this, ensure your business structure utilizes digital bank transfers that meet specific federal exemption criteria. If you are also managing a UK entity, you might find similarities in how you handle UK limited company accounting for 2026, where structured reporting is the only way to minimize unnecessary fees.
3. IRS AI Enforcement is Targeting International Sellers
The IRS has officially integrated advanced AI systems designed to cross-reference customs data, marketplace reports (like Amazon and Shopify), and bank transfers in real-time.
In 2026, automated audit risk has increased fourfold compared to 2024. These AI "bots" look for discrepancies between the value of goods declared at the border and the revenue reported on your tax filings. If there is a mismatch, the system triggers a compliance notice automatically. This level of scrutiny makes it essential to ensure your bookkeeping is reconciled daily.
4. The $600 Reporting Threshold is Now Transparent
Every digital transfer exceeding $600 is now visible to IRS algorithms. While this was discussed for years, the 2026 implementation is total. Whether it’s a payment to a contractor or a transfer between accounts, the IRS receives a data ping.
For international sellers, this means complete transparency is mandatory. Even if your US-based LLC owes zero tax due to treaty benefits, you must still file informational returns. Failure to report these movements can flag your account for a manual review.
5. Foreign Earned Income Exclusion (FEIE) Increased
There is some good news for international founders who are also US taxpayers (or residents). For the 2026 tax year, the FEIE has increased to $132,900. When combined with the standard deduction, qualifying individuals can exclude roughly $149,000 of foreign earnings from US federal income tax.
However, claiming this requires strict adherence to physical presence tests or bona fide residence tests. If you are scaling globally, you may want to compare how this works alongside other regions, such as the 2026 EU ViDA rollout, which also aims to simplify cross-border selling through digital reporting.
6. Form 5472 Penalties Have Hit $25,000
If you operate a foreign-owned US LLC, Form 5472 is your most important annual document. It reports transactions between the LLC and its foreign owners.
The IRS has adopted a zero-tolerance policy in 2026. Filing this form late, or with incomplete information, now carries a minimum penalty of $25,000. This penalty applies even if the LLC had no taxable income. Because this is an "informational" filing, many sellers overlook it until the fine arrives. Don't be one of them.
7. State Sales Tax Nexus and Amnesty Programs
Economic nexus remains the biggest trap for international sellers. If you sell into a state and exceed their threshold (often $100,000 in sales or 200 transactions), you must register, collect, and remit sales tax.
In 2026, several states, including Illinois, have launched Voluntary Disclosure Programs (VDP). These programs allow sellers who have missed their obligations to come forward, pay back taxes for a limited "look-back" period (usually 3-4 years), and have all penalties waived. If you have been selling in the US without a sales tax strategy, these amnesty windows are your best way to "reset" your compliance. You can learn more about avoiding these pitfalls in our guide on 7 mistakes you’re making with US sales tax.
8. Marketplace Facilitator Laws Don’t Replace Filing
A common misconception in 2026 is that because Amazon or Walmart collects sales tax, the seller has no responsibility. This is incorrect.
While marketplaces collect and remit the actual tax dollars in most states, the seller is often still required to register for a sales tax permit and file "zero" or "informational" returns in those states. This tells the state that you are active and that your taxes are being handled by the facilitator. Skipping these filings can result in the revocation of your right to sell in that state.
9. Updated Landed Cost Math for 2026
With the Section 122 surcharge and fluctuating shipping costs, your "landed cost" (the total price of a product once it arrives at your warehouse) is likely higher than it was six months ago.
International sellers must factor in:
- The 10% Federal Surcharge.
- Customs brokerage fees for AI-compliant entries.
- The 1% Remittance fee for repatriating profits.
If you are also selling in the UK or Canada, you should compare these costs against Canada's 2026 GST/HST updates to decide where to allocate your inventory for the best margins.
10. Arizona Waste Tire Fee Update (July 1, 2026)
Compliance is often found in the details. Starting July 1, 2026, Arizona is updating its Waste Tire Fee to 2% of the sale price (capped at $4.73 per tire).
This applies to any new tire sold, including those on trailers or motorized equipment. While it sounds niche, it represents a trend: US states are moving toward specific environmental fees in addition to standard sales tax. If your product category involves tires, batteries, or electronics, you need to monitor these state-level "micro-updates" monthly.
How Sterlinx Global Simplifies Your USA Compliance
Navigating the IRS and 50 different state tax departments is a full-time job. At Sterlinx Global, we take the data from your marketplaces and bank accounts and handle the execution for you. We provide end-to-end compliance delivery, including:
- Real-time bookkeeping and tax calculations.
- Sales Tax registration and monthly filings.
- Form 5472 and federal tax preparation.
- Year-end accounts for international entities.
Our goal is to ensure you never have to worry about a $25,000 penalty or an AI-triggered audit. You scale your brand; we handle the compliance.
Frequently Asked Questions
Does the 10% surcharge apply to digital services?
No, the Section 122 surcharge currently applies only to physical goods imported into the US. Digital services like SaaS or consulting are generally exempt from this specific import fee, though they are subject to different state-level sales tax rules.
I have a US LLC but live in the UK. Do I still need to file US taxes?
Yes. Even if your LLC is "disregarded" for tax purposes, you have federal filing requirements (like Form 5472) and potential state sales tax obligations. If you also have a UK company, you must ensure your UK corporation tax filings and US filings are aligned to avoid double taxation.
What happens if I miss a sales tax filing deadline in 2026?
With AI enforcement, the state is likely to know you missed it within days. Penalties for late filing range from $50 to hundreds of dollars per return, plus interest. It is essential to file on time, even if you had zero sales in that state for the month.
How do I know if I have "Nexus" in a US state?
You have nexus if you have a physical presence (like inventory in an FBA warehouse) or if you exceed the state's economic threshold (usually $100,000 in annual sales). If you use third-party logistics (3PL) in the US, you almost certainly have physical nexus in the state where that warehouse is located.
Is it too late to use a Voluntary Disclosure Program?
No, but these windows don't stay open forever. If you realize you have been selling in a state like Illinois or California for years without registering, a VDP is the safest and cheapest way to get compliant before the IRS AI systems flag your business.
Ready to get your US tax compliance under control?
Contact us today to speak with an expert about our Daily Compliance Suite.
