The 2026 US tax season is here! As a cross-border e-commerce seller, you must understand the tax filing processes for LLCs and INCs.

Yiju Overseas has compiled a comprehensive 2026 tax guide, including the tax differences between LLCs and INCs, deadlines, tax forms, and key points to avoid pitfalls.

1. Core Tax Differences Between LLC and INC

1.1 LLC (Limited Liability Company)

1.1.1 Default Tax Status: Not an independent taxable entity; profits and losses pass through to members' personal tax returns.

Single-member LLC: Treated as a disregarded entity; business income and expenses are included in the individual's tax return.

Multi-member LLC: Taxed as a partnership, with each member reporting their share on their personal tax return.

1.1.2 Optional Tax Status: Elect to be treated as a C-Corp by filing Form 8832 or as an S-Corp by filing Form 2553.

1.1.3 Mandatory for Foreign LLCs: Non-resident owners of a single-member LLC must file Form 5472, regardless of transactions.

1.2 INC (C-Corp, Corporation)

1.2.1 Independent Tax Entity: The company pays 21% federal corporate income tax; dividends to shareholders are taxed again at the individual level (double taxation).

1.2.2 Filing Entity: The company files Form 1120 independently, separate from shareholders' individual taxes.

2. Key Tax Forms and When to File

2.1 LLC Tax Filing

2.1.1 Single-member LLC

Tax Form: Filed in personal taxes

Filing Method: Business profits/losses reported via personal Form 1040 + Schedule C

2.1.2 Multi-member LLC

Tax Form: Form 1065 + K-1

Filing Method: LLC itself does not pay taxes; members report on personal or corporate tax returns

2.1.3 LLC Electing S-Corp

Tax Form: Form 1120-S + K-1

Filing Method: LLC files and pays taxes as an S-Corp

2.1.4 LLC Electing C-Corp

Tax Form: Form 1120

Filing Method: Filed as a C-Corp

2.2 INC Tax Filing

Tax Form: Form 1120

Filing Method: Companies must submit annually to report income, profits, deductions, taxes, etc.

3. Key Deadlines for the 2026 Tax Season

⚠️Note: Extensions only delay filing, not payment. Estimated taxes must be paid by the original deadline to avoid penalties!

4. Key Points to Avoid Pitfalls for LLC and INC

4.1 No Income or Loss Means No Tax Filing

Myth: No need to file if the company has no operations, profit, or loss.

Reality: Filing is required annually, regardless of profit or loss, once registered and issued an EIN. Zero income requires a zero return; losses can be carried forward to offset future profits.

4.2 Only Considering Registration State, Ignoring State and Sales Taxes

Myth: Registering in low-tax states like Delaware or Wyoming means no other state taxes.

Reality: Tax liability depends on business location, inventory location, sales volume (economic nexus). Using FBA storage or selling in multiple states usually requires income and sales tax filings in those states.

4.3 Disorganized Books, Incomplete Income/Expense Records

Myth: Rough bookkeeping, losing invoices, missing small incomes.

Reality: The IRS requires complete, accurate, and traceable accounting records. Underreporting any income (PayPal, Stripe, cash) can lead to audits.

4.4 Not Requesting an Extension, Directly Filing Late

Myth: If there's not enough time, don't file and deal with it later.

Reality: Extensions can be requested, usually for 6 months, but taxes must still be estimated and paid on time to avoid interest.

Lastly:

As the US tax filing deadlines approach, it is advisable for both LLCs and INCs, whether profitable or not, to organize their company's finances and filing structure early to avoid fines and tax risks due to delays or errors.

That's all for the content shared by Yiju Overseas. Feel free to leave comments and discuss!