US CORPORATE TAX SERVICES
Expert Form 1120 tax preparation for C corporations — accurate C-corp tax return filing covering the flat 21% federal rate, R&D credits, NOL carryforwards and multi-state apportionment. Your dedicated corporate tax preparer US, delivering precision every filing season.
Form 1120 (U.S. Corporation Income Tax Return) is the annual federal tax return filed by C corporations. Unlike partnerships or S corporations, a C corporation is taxed as a separate legal entity — it pays corporate income tax on its profits at the flat 21% federal rate, and shareholders separately pay tax on any dividends received (the well-known "double taxation" of C-corps).
Our C corporation tax filing services ensure your Form 1120 accurately reflects your corporation's income, deductions and credits — while identifying every available strategy to legally minimise your tax liability, from R&D credits to depreciation elections to NOL carryforwards.
Key deadlines: April 15 — standard filing deadline for calendar-year C corporations. October 15 — extended deadline with Form 7004. Estimated quarterly tax payments due April 15, June 15, September 15 and December 15.
Our corporate tax preparer US team handles every C-corp situation:
Delaware C-corps backed by venture capital — where the corporate structure is required by investors, with careful attention to QSBS (Qualified Small Business Stock) eligibility.
US subsidiaries of Indian, UK or other foreign parent companies — requiring Form 5472 disclosure of related-party transactions and transfer pricing documentation.
C-corps operating across multiple states — requiring apportionment calculations, nexus analysis and state-specific corporate tax return filing beyond the federal Form 1120.
Companies with significant R&D activity, capital equipment purchases and inventory — maximising Section 174 R&D treatment, Section 179 and bonus depreciation.
C-corps holding commercial or investment property — with attention to depreciation recapture, like-kind exchange rules and passive activity considerations.
Corporations providing professional services (consulting, medical, legal) — subject to specific PSC tax rules and reasonable compensation requirements.
Our Form 1120 tax preparation covers the full range of corporate tax positions:
If your C corporation is 25% or more foreign-owned (a common structure for Indian entrepreneurs setting up US operations), C-corp tax return filing carries an additional, high-stakes obligation:
Form 5472 discloses all related-party transactions between the US corporation and its foreign owner — capital contributions, intercompany loans, management fees, cost allocations and more. The penalty for failing to file Form 5472, or filing it incompletely, is $25,000 per form, per year — with no exception for reasonable cause in many cases. This is one of the most commonly missed compliance obligations among foreign-owned US startups, and one of the most expensive to get wrong. Our corporate tax preparer US team specifically reviews foreign ownership structures to ensure Form 5472 is filed correctly and completely with every Form 1120.
We review your trial balance, financial statements, prior-year return and ownership structure — identifying any foreign ownership, multi-state activity or R&D positions upfront.
We reconcile book income to taxable income, applying correct depreciation methods, identifying permanent and temporary differences, and calculating any NOL utilisation.
We identify R&D credits, Section 179/bonus depreciation elections and other available deductions — legally minimising your corporate tax liability within IRS rules.
We prepare the complete Form 1120 package including all required schedules and forms (5472, 4562, etc.), and review the return with you before filing.
We e-file the return with the IRS and any state returns, and set up your quarterly estimated tax payment schedule for the following year to avoid underpayment penalties.
AAPT & Associates provides C corporation tax filing services with particular depth in foreign-owned corporation compliance — a natural strength given our India-US practice. We understand the specific traps that catch Indian founders setting up Delaware C-corps: Form 5472 disclosure, transfer pricing documentation for intercompany transactions, and coordinating US tax positions with Indian reporting obligations. Our corporate tax preparer US team also handles standard US-owned C-corps, multi-state apportionment and R&D credit optimisation with equal rigour.
C corporations pay a flat 21% federal corporate income tax rate on taxable income, regardless of profit level. This is separate from any state corporate income tax, and separate from tax that shareholders pay on dividends received — the source of the "double taxation" often cited as a C-corp drawback.
The standard deadline for C-corp tax return filing is April 15 for calendar-year corporations. An automatic 6-month extension to October 15 is available via Form 7004 — but estimated tax payments are still due on the original quarterly schedule.
Form 5472 is required for any US corporation that is 25% or more foreign-owned, disclosing all related-party transactions with the foreign owner. The penalty for non-filing is $25,000 per form. Our Form 1120 tax preparation service specifically screens for this requirement — it is one of the most commonly missed obligations for foreign-founded US startups.
Yes. Net Operating Losses (NOLs) generated after 2017 can be carried forward indefinitely (though limited to 80% of taxable income in the year used). Our corporate tax preparer US team tracks NOL balances year over year and applies them correctly to minimise current-year tax liability.
Most states require a separate corporate income tax return in addition to federal Form 1120. If your corporation has nexus (a taxable presence) in multiple states, apportionment calculations determine how much income is taxable in each state. Our C corporation tax filing services include multi-state return preparation and nexus analysis.
Yes — this is one of our core specialisations. We work with Indian and other foreign founders who have set up Delaware C-corps for US operations or VC fundraising, handling Form 1120, Form 5472 disclosure, and coordination with any India-side tax and compliance obligations for the founder or parent entity.
The $25,000 penalty for missing Form 5472 is entirely avoidable. Talk to our corporate tax team today.
