State tax return
For each state where your business has employees, an office, or a lot of sales.
C-Corp
S-Corp
LLC
Partnership
Foreign-owner report (Form 5472)
For US corporations that are 25% or more foreign-owned, and one-owner LLCs whose owner lives outside the US. Missing it can mean a $25,000 IRS penalty.
Foreign subsidiary report (Form 5471)
For each company your business owns or controls outside the US.
Foreign bank account report (FBAR)
If your business’s accounts outside the US added up to more than $10,000 at any point in the year.
C-Corp
S-Corp
LLC
Partnership
Quarterly estimated taxes
Worked out and filed each quarter. C-Corps pay these as a business. For LLCs, partnerships and S-Corps, owners usually pay them on their personal taxes.
C-Corp
S-Corp
LLC
Partnership
$100
per quarter (federal), plus $50 per quarter per state
California corporate return (Form 100)
If your C-Corp is registered or doing business in California. S-Corps file Form 100S and LLCs file Form 568 instead.
Investment in a foreign company (Form 926)
If your business put money into a foreign company and owns 10% or more of it, or transferred more than $100,000 to it within 12 months.
Accounting method change (Form 3115)
Changes how your business accounts for income or expenses, including switching from cash to accrual
C-Corp
S-Corp
LLC
Partnership
Foreign asset disclosure for companies (Form 8938)
Only for closely held companies that earn mostly passive income, such as investment holding companies.
Foreign ownership survey (BE-12)
Commerce Department survey for US companies with a foreign owner.
Foreign affiliate survey (BE-10)
Commerce Department survey for US companies that own a business abroad.
S-Corp election (Form 2553)
If you want company profits taxed on the owners’ personal returns instead of at the company level. Only for companies owned by US citizens or residents.
C-Corp
LLC electing S-Corp
Entity classification election (Form 8832)
If your LLC wants to be taxed as a corporation instead of as a partnership or sole proprietorship.
83(b) election
For founders who received shares that vest over time. It has to reach the IRS within 30 days of the grant.
Owner income statement (K-1)
Shows each owner’s share of the company’s income, filed for every owner.
Partnership / multi-member LLC
S-Corp
International tax items (K-3)
Reports each partner’s share of international tax items, for partnerships with foreign activity or foreign partners.
Partnership / multi-member LLC
GILTI calculation (Form 8992)
For US companies that own a controlled foreign corporation. Works out the US tax on the foreign company’s income.
Form 1099
US contractors and landlords you paid.
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