IRS Dirty Dozen Tax Scams 2026: Small Business Guide

By Adham Abadier, CPA — California CPA License #158599

IRS Dirty Dozen Tax Scams 2026: What Every Inland Empire Small Business Owner Must Know

Every spring, the IRS drops a warning that every small business owner should read before doing anything else during tax season. On March 5, 2026, the IRS released its annual Dirty Dozen tax scams list — the agency’s most pointed public alert about schemes actively targeting businesses and individuals right now. If you run a small business in the Inland Empire — whether you’re a contractor in Moreno Valley, a retail shop owner in Riverside, or a trucking LLC based in Fontana — the IRS Dirty Dozen tax scams 2026 list contains threats aimed directly at you.

These aren’t hypothetical dangers. The IRS and its Security Summit partners — a coalition of state tax agencies and private-sector tax industry leaders — track real complaints, real losses, and real criminal prosecutions. In this post, we break down all 12 scams, call out the ones that hit small businesses hardest, share a real-world example of what falling for one of these costs, and give you a five-step protection checklist you can act on today. If you’d prefer to speak with a local expert right away, contact our team for a no-cost consultation.

Why the IRS Dirty Dozen Tax Scams 2026 List Matters More Than Usual

The IRS has published the Dirty Dozen list for more than 20 consecutive years, but the 2026 edition carries added urgency for three reasons:

1. AI-powered scams are here. Fraudsters now use artificial intelligence to generate highly convincing IRS impersonation emails, phone calls with cloned voices, and fake websites nearly indistinguishable from IRS.gov. The old tell-tale signs — bad grammar, obvious typos — are largely gone.
2. A brand-new scam was added for 2026. The IRS flagged fabricated Form 2439 capital gains refund claims as a new scheme, meaning promoters have invented an entirely new fraud vehicle this year.
3. ERC enforcement is accelerating. The IRS has now processed tens of thousands of ERC audits and continues to pursue businesses that filed improper Employee Retention Credit claims — many of whom were misled by aggressive promoters.

All 12 IRS Dirty Dozen Tax Scams 2026 — Plain-Language Breakdown

Below is every entry on the 2026 Dirty Dozen list, with specific attention to how each one targets small business owners in the Inland Empire and beyond.

1. Phishing Emails & Smishing Text Messages

Scammers send emails, direct messages, and text messages that appear to be from the IRS, often using alarming subject lines like “Action Required: Your Business Account Is Under Review.” These messages include QR codes or links directing you to fake IRS websites designed to harvest your EIN, Social Security number, bank account details, or login credentials.

Why small businesses are prime targets: Business owners regularly communicate with the IRS over payroll tax deposits, quarterly estimates, and notices — so an “IRS” email doesn’t automatically raise a red flag the way it might for a wage-earner who rarely hears from the agency.

2. IRS Impersonation Phone Calls

In 2026, AI voice-cloning technology has made impersonation calls chillingly realistic. Scammers call claiming to be IRS agents, threaten immediate arrest or business license revocation, and demand payment by gift card, wire transfer, or cryptocurrency. Some spoofed calls even display “IRS” on caller ID. The IRS will never demand immediate payment without first mailing a bill, require a specific payment method, or threaten to involve law enforcement for failure to pay immediately.

3. Online Account Takeover & Identity Theft

Fraudsters use stolen credentials to access IRS Online Accounts, file fraudulent returns in your business’s name, or intercept tax refunds. Inland Empire businesses that use multiple cloud-based accounting platforms (QuickBooks Online, payroll portals, etc.) face elevated exposure if any single login is compromised. Our monthly bookkeeping service includes a login-hygiene review for every client.

4. Return Preparer Fraud

Unscrupulous “ghost preparers” — those who prepare tax returns for a fee but refuse to sign the return — are a recurring Dirty Dozen entry. They often promise inflated refunds, charge fees as a percentage of the refund, and disappear, leaving the business owner legally responsible for a fraudulent filing.

California-specific note: California Business and Professions Code §22250 requires all paid tax preparers not already licensed (CPA, attorney, enrolled agent) to register with the California Tax Education Council (CTEC). Always verify your preparer’s credentials at ctec.org or the California Board of Accountancy. Our tax accountant Moreno Valley page explains how to vet local preparers.

5. Fake Charities

Scammers create fraudulent charitable organizations — often with names similar to well-known nonprofits — and solicit donations from businesses seeking charitable deductions under IRC §170. The donation is not deductible, and providing your business’s financial information to a fake charity opens you up to identity theft.

6. Social Media Tax Advice Schemes

Viral posts on TikTok, Instagram, and YouTube continue to push false tax strategies: claiming personal groceries as business expenses, using a “Section 199A loophole” that doesn’t apply to your business type, or using a business credit card to circumvent income reporting. The IRS specifically called out social media as a Dirty Dozen vector in 2026. Following this advice doesn’t just waste money — it triggers penalties and potentially criminal fraud charges. If you see a tax “hack” with 2 million views, that’s a reason to call your CPA, not a reason to file it. Proactive tax planning strategy with a licensed CPA is the only reliable path to legal tax reduction.

7. Aggressive Employee Retention Credit (ERC) Promoters

The ERC saga is far from over. Promoters continue to cold-call Inland Empire business owners, claiming they qualify for tens of thousands in ERC refunds — even for businesses that clearly do not meet the eligibility criteria (significant revenue decline or full/partial government shutdown in 2020–2021). The promoters charge large upfront or contingency fees, file the fraudulent claim, and vanish. The business is then subject to IRS audit, required to repay the credit with interest and penalties of up to 20%, and potentially faces civil fraud penalties of 75% of the underpayment.

8. Offer in Compromise “Mills”

Fraudulent tax resolution companies advertise settling IRS tax debt for “pennies on the dollar” — often targeting small business owners who owe back payroll taxes or income taxes. They collect large upfront fees (sometimes $5,000–$10,000), do little to no actual work, and many taxpayers end up worse off than before. The IRS has a free Offer in Compromise Pre-Qualifier tool at IRS.gov — any legitimate CPA will use it before recommending you pursue an OIC. Our tax audit defense service includes an honest OIC eligibility analysis at no extra charge.

9. Maltese (Foreign) Pension Arrangements

This scheme involves claiming that contributions to foreign pension plans in Malta or similar jurisdictions are deductible under U.S. tax treaties. The IRS has explicitly identified these as listed transactions and abusive tax shelters. Penalties for participating in listed transactions can reach $100,000 per year for individuals and $200,000 per year for corporations.

10. Micro-Captive Insurance Arrangements

Some promoters pitch small business owners on creating their own “captive” insurance company to deduct premiums while the related entity pays little to no claims. The IRS has aggressively litigated these and won. Micro-captives remain on the Dirty Dozen list because promoters continue pitching them to profitable small businesses.

11. Syndicated Conservation Easements

Promoters sell interests in land partnerships that claim inflated charitable deductions for donating easements on land. The IRS classifies these as listed transactions. While less common among typical Inland Empire small businesses, some real estate investors in the region have been pitched these arrangements.

Real-World Example: What One ERC Scam Cost an IE Logistics Company

Consider a hypothetical — but entirely realistic — scenario that mirrors cases seen in the Inland Empire logistics and transportation sector:

A trucking LLC based in Fontana with 12 employees receives a cold call in early 2024 from an “ERC specialist.” The promoter claims the business qualifies for $180,000 in Employee Retention Credits. The business owner, who had no CPA relationship to evaluate eligibility, agrees and pays the promoter a 25% contingency fee — $45,000 — upfront from the refund.

In late 2025, the IRS sends an audit notice. The examiner determines the business did not experience a qualifying revenue decline or government-mandated shutdown. The IRS disallows the full $180,000 ERC claim and asserts:

$282,600 in total damage for a credit the business never legitimately qualified for. This is why the ERC scam remains one of the most financially destructive items on the IRS Dirty Dozen tax scams 2026 list for small businesses.

5-Step Protection Plan Against IRS Tax Scams 2026 for Inland Empire Business Owners

Here’s what you can do right now to protect your Moreno Valley, Riverside, or Temecula business from every item on the 2026 Dirty Dozen list:

California-Specific Risks: Why Inland Empire Business Owners Face Elevated IRS Scam Exposure

The Inland Empire’s economic growth — driven by logistics, warehousing, construction, and small manufacturing — has made it a target-rich environment for tax scammers. Here’s why:

• High concentration of small business owners in trades and services who may not have a dedicated CPA relationship year-round. Our Riverside tax services and Ontario tax services pages serve clients across the IE.
• Large immigrant business-owner community in Riverside, San Bernardino, and Fontana — scammers specifically target non-native English speakers with intimidating IRS impersonation calls. We provide bilingual support; visit our Spanish business tax page for information in Spanish.
• Growth-stage companies in the IE’s booming e-commerce logistics sector carry significant payroll tax liabilities, making them attractive for ERC promoters claiming large retroactive credits.
• California’s own Franchise Tax Board (FTB) runs parallel enforcement — a fraudulent federal claim can trigger a California audit as well, since California generally conforms to federal taxable income under California Revenue and Taxation Code §17071. Learn more at the California FTB website.

If you received an ERC refund and have not had a qualified CPA independently verify your eligibility, the window to use the IRS Voluntary Disclosure Program may still be open — but it is narrowing as enforcement ramps up.

What to Do If You’ve Already Been Targeted by an IRS Tax Scam in 2026

If you suspect you’ve fallen victim to any of the 2026 Dirty Dozen scams, take these steps immediately:

1. Report phishing or smishing to the IRS at phishing@irs.gov
2. Report IRS impersonation calls to the Treasury Inspector General for Tax Administration (TIGTA) at 1-800-366-4484 or at tigta.gov
3. Report fraud to the FTC at ReportFraud.ftc.gov
4. If you shared financial account information, contact your bank immediately to freeze or monitor the affected accounts
5. Contact a licensed CPA to assess whether fraudulent returns were filed under your EIN and to initiate corrective action. Our IRS notice help team is ready to act fast.

The sooner you act, the more options you have. IRS enforcement timelines are real — waiting typically increases financial penalty exposure substantially.

Frequently Asked Questions: IRS Dirty Dozen Tax Scams 2026