Services

US business tax returns

Quick answer

We prepare US federal and state business tax returns: Forms 1120, 1120-S and 1065 with state returns, plus information returns such as 1099s and Form 5472, and extensions. For CPA firms we prepare in your tax software and your firm reviews, signs and files. For startups and SMEs we serve directly, every return is reviewed by a licensed US CPA before it is filed. Because we often keep the books too, the return starts from a closed, reconciled ledger.

Last reviewed by the Offshore Accounting Hub team: 6 October 2026

What we prepare

ReturnFor
Form 1120C corporations
Form 1120-S, with Schedules K-1S corporations
Form 1065, with Schedules K-1Partnerships and multi-member LLCs
State income and franchise returnsThe states where the business files
Forms 1099-NEC and 1099-MISCPayments to contractors and other payees
Form 5472Foreign-owned US corporations and single-member LLCs
Form 7004Extensions for business returns

For CPA firms

  • Preparation in your tax software, under your firm’s logins, to your workpaper and review standards.
  • Book-to-tax workpapers: trial balance mapping, M-1 and M-2 or M-3 schedules, fixed asset and depreciation workings, and a list of open questions for your reviewer.
  • Busy-season capacity: we take returns off your preparers’ desks from January, so your team can focus on review and clients.
  • Your sign-off stays yours. Your firm reviews, signs and files every return.

For startups and SMEs

  • One team for books and tax. We close the year, prepare the financial statements and then the federal and state returns from the same ledger.
  • US CPA review of every return before it is filed.
  • A filing calendar with federal, state and information return due dates, and extensions filed where needed.
  • Foreign-owned US companies: Form 5472 and the related filings for US subsidiaries and LLCs of Singapore, Indian and other overseas groups.

How a return moves through our team

  1. You send the year-end trial balance, prior-year return and organiser, or we close the books ourselves.
  2. We map the trial balance, prepare the book-to-tax workpapers and the return, and list open questions.
  3. A senior on our side reviews the return and the workpapers.
  4. Your reviewer or our US CPA reviews, we clear the notes, and the return is signed and filed.

Frequently asked questions

Which returns do you prepare?
Business returns: Form 1120 for C corporations, Form 1120-S for S corporations and Form 1065 for partnerships and multi-member LLCs, with Schedules K-1 and the related state returns. We also prepare information returns such as Forms 1099-NEC and 1099-MISC, Form 5472 for foreign-owned US companies, and extension requests on Form 7004.
Who signs and files the return?
For CPA firms, your firm reviews, signs as the paid preparer and files; we prepare and clear your review notes. For businesses we serve directly, a licensed US CPA reviews the return before it is filed.
Do you prepare individual (Form 1040) returns?
Our focus is business and information returns. Ask us on the scope call if you need help with related individual returns.
Do we need client consent to send tax return information to you?
Often, yes. Internal Revenue Code Section 7216 sets consent rules for disclosing tax return information, including to a preparer outside the United States. Your firm should check what applies. Our guide on client confidentiality sets out what to check.
How is tax preparation priced?
We quote a fixed fee per return, based on the entity type, the number of states and how ready the books are. During busy season you can also use per-hour or dedicated support.
Can you help foreign-owned US companies?
Yes. Many Singapore and Indian groups have a US subsidiary or LLC. We keep its books, prepare its federal and state returns and Form 5472 where it applies, so the parent has one team for the US entity's accounting and tax.

General information only, not legal, tax, audit or professional-conduct advice. Rules, standards and software features change, so confirm the position that applies to your firm before you act. See our disclaimer.

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