Navigating the American tax landscape has always been a challenge for international business owners. However, as of March 2026, the IRS has introduced some of the most significant changes we have seen in a decade. Whether you are running a UK Limited Company, a Canadian Corporation, or a fast-growing digital agency in Australia, these updates directly impact your bottom line and your compliance requirements.
At Sterlinx Global, we monitor these changes daily so you don't have to. The shift toward AI-driven auditing, updated deduction rules, and tighter reporting standards means that "flying under the radar" is no longer a viable strategy. If you want to scale your business in the U.S. market safely, staying informed is your first line of defense.
Here are the 10 most critical IRS changes and tax updates international sellers need to know for 2026.
1. The New 1% Federal Remittance Tax
Starting January 1, 2026, a new 1% federal excise tax has been implemented on certain outbound international remittance transfers from the U.S., largely impacting cash-funded transfers (for example, cash, money orders, or cashier’s checks) through remittance providers. For many international sellers, this can feel like a direct hit on margins when you move money across borders.
Don’t worry, there’s a practical workaround. In most cases, you can avoid the 1% charge by using electronic funding methods (bank transfer/ACH, cards, and other traceable digital payments) and verified business accounts that create a clear, auditable trail. Keeping clean, automated bookkeeping isn’t just “nice to have” anymore—it helps you prove what happened and stay compliant.
2. 'One, Big, Beautiful Bill' Changes You Should Not Ignore
Some of the biggest U.S. tax changes affecting 2026 did not start this year. They came from the One, Big, Beautiful Bill, signed in July 2025, and they are now shaping how families and business owners plan cash flow, benefits, and deductions.
One headline item is "Trump Accounts", a new family savings framework designed to support long-term saving for eligible children. Another major shift is the expansion of HSA access and usability, including broader eligibility tied to certain health plan types and more flexible treatment of some healthcare arrangements. If you operate a U.S. business, especially one with a growing team, it is worth reviewing whether these benefit-related changes affect payroll setup, reimbursements, or owner compensation planning.
3. 100% Bonus Depreciation Is Back for 2026
This is one of the biggest business tax wins now confirmed for 2026. 100% bonus depreciation has been permanently restored for qualifying property under the updated rules, which means you can often deduct the full cost of eligible assets in the year they are placed in service instead of spreading the deduction over several years.
If you are investing in equipment, technology, certain software, or other qualifying business assets, this can improve cash flow fast. It is essential to track acquisition dates, placed-in-service dates, and asset classification properly. If those records are messy, you can easily lose the benefit or create problems later during an IRS review.
4. R&D Expensing Has Been Reinstated
If your business spends money on product development, software builds, technical improvements, or other qualifying research activities, this change matters a lot. Domestic R&D expensing has been reinstated, reversing the earlier rule that forced many businesses to capitalize and amortize those costs over time.
That means qualifying domestic research and experimental costs can once again be deducted more quickly, which is good news for SaaS companies, agencies building proprietary tools, and fast-growing SMEs investing in innovation. Keep in mind that foreign R&D treatment is still more restrictive, so you need to separate domestic and overseas costs clearly in your records.
5. The 30% Interest Deduction Limit Still Needs Attention
Borrowing costs remain a pressure point for many growing businesses. Under the business interest limitation rules, the deduction is generally capped at 30% of adjusted taxable income, subject to the usual exceptions and technical rules.
This is especially important if you are funding U.S. growth through loans, intercompany financing, or heavy working capital facilities. Don’t assume all interest will be deductible just because it is a genuine business cost. You need to model the tax impact properly and keep your financing documentation tidy.
6. Clarified Form 1099-K Reporting Thresholds
There has been a lot of confusion around Form 1099-K, so let’s keep this simple. As confirmed in current IRS guidance, the reporting threshold for third-party network transactions is more than $20,000 and more than 200 transactions.
This means platforms like Stripe, PayPal, Amazon, and Shopify are not using the old $600 rule for these third-party network thresholds in the way many sellers feared. Still, don’t get too comfortable. Even if you do not receive a 1099-K, the income can still be taxable, and your books still need to match what the IRS can see from payment processors and marketplace records.
7. Digital Sales Tax Is Expanding Across States
This one catches a lot of digital businesses off guard. More U.S. states are expanding sales tax treatment for SaaS, streaming, subscriptions, and digital services, and the rules still vary heavily by state.
If you sell software access, online content, digital memberships, or cloud-based services, you need to review your nexus position and your product taxability state by state. Some states tax SaaS. Some do not. Some tax streaming separately. This is why your setup needs to be operational, not guesswork. If you collect too little, you face assessments. If you collect too much, you create customer friction and refund issues.
8. Strict Enforcement of Forms 5471 and 5472
The IRS is no longer being lenient with "informational" returns. Forms 5471 (for U.S. persons with interests in foreign corporations) and 5472 (for foreign-owned U.S. corporations or LLCs) are now a top priority for enforcement.
In 2026, the penalties for failing to file these forms or filing them incorrectly remain severe. Even if your company owes $0 in actual tax, a missing Form 5472 can result in a minimum penalty of $25,000. We see many international sellers overlook this because they focus only on Sales Tax. To understand the full scope of your obligations, it is worth looking at the secrets of U.S. Sales Tax and Nexus.
9. Heightened Scrutiny on Transfer Pricing
If you operate as a multinational entity: for example, a UK Limited Company with a U.S. LLC subsidiary: the IRS is looking closely at your "Transfer Pricing." They want to ensure that the prices you charge between your own companies are "arm’s length" (fair market value).
The goal of the IRS is to prevent companies from shifting profits out of the U.S. to lower-tax jurisdictions. For 2026, you must maintain documentation that justifies your internal pricing. This is a critical part of a practical compliance playbook for any scaling SME.
10. Ongoing Tariff and Trade Volatility
As we move through 2026, trade policy remains volatile. Several new fees on e-commerce parcels have been proposed to level the playing field for domestic retailers. International sellers must stay agile. We recommend reviewing your supply chain quarterly to ensure that sudden tariff changes don't wipe out your profit margins.
Summary Checklist for 2026 Compliance
- Audit your transfers: Use electronic methods for qualifying U.S.-to-foreign transfers to avoid unnecessary 1% remittance tax costs where possible.
- Review new reliefs: Check whether bonus depreciation, R&D expensing, HSA changes, or family savings rules affect your planning and recordkeeping.
- Match your data: Verify that your 1099-K totals and processor data align with reported income.
- Review financing: Test whether the 30% business interest limitation could restrict deductions.
- Map your tax footprint: Review state-by-state sales tax exposure for SaaS, streaming, and digital services.
Frequently Asked Questions
Does the 1% remittance tax apply to all international sellers?
No. It is tied mainly to certain outbound remittance transfers, especially cash-funded ones. Many traceable digital payment methods can reduce or avoid that extra cost, but you still need proper documentation.
What is the 1099-K threshold for 2026?
For third-party network transactions, the current IRS position is more than $20,000 and more than 200 transactions. Even so, all taxable income must still be reported, whether or not a 1099-K is issued.
Can I fully expense R&D costs again?
For qualifying domestic research and experimental costs, yes, faster expensing has been restored. This is especially helpful for software, product development, and innovation-led businesses. Foreign R&D rules are still more restrictive.
Does digital sales tax apply to SaaS everywhere in the U.S.?
No. That is exactly why this area is tricky. Some states tax SaaS and digital products, some exempt them, and some apply different rules to streaming, subscriptions, or business-use software. You need a state-by-state review.
Is it still worth selling in the USA with these changes?
Absolutely. The U.S. remains the world's largest consumer market. The rules are getting more formal, but that also makes strong operators stand out. If you stay compliant, you build a more stable and scalable business.
How Sterlinx Global Can Help
Managing international tax compliance shouldn’t be your full-time job. At Sterlinx Global, we work as your Global Tax Compliance Suite. You provide the data, and we handle the ongoing execution: bookkeeping, tax calculations, Sales Tax filings, VAT/GST compliance, payroll support, and year-end reporting where applicable.
Whether you need full compliance support in the UK, Ireland, USA, Canada, or Australia, or standalone VAT and indirect tax support across key EU jurisdictions, we’re here to help you stay on top of deadlines, filings, and cross-border reporting without the stress.
Ready to secure your U.S. expansion?
Contact us and we’ll help you get your reporting, filings, and ongoing compliance sorted.
