US business returns for LLCs, partnerships, S-Corps, and C-Corps — including cross-border founders and inbound structures with foreign shareholders.
A UK founder spinning up a Delaware C-Corp without S-Corp planning, or a US founder defaulting to an LLC for a UK customer base — both very common, both expensive. The choice between LLC, S-Corp, and C-Corp drives everything from self-employment tax to GILTI exposure to whether you can take dividends without double tax. The right shape depends on where the customers are, where the founder lives, and where the money will be repatriated. We make those calls for a living.
Each one is a separate service with its own page — click Learn more on any block below to see the full scope, deliverables, and pricing notes.
Federal returns for single- and multi-member LLCs — reported on Schedule C or Form 1065 depending on structure and election.
Single & multi-member LLCs.
Learn moreUS partnership returns including K-1s for each partner, with attention to international allocations.
US partnerships with UK-based partners.
Learn moreS-Corp filings (Form 1120-S) and shareholder K-1s — including cross-border shareholder considerations.
S-Corp filing for US expat shareholders.
Learn moreC-Corp compliance (Form 1120) for cross-border businesses, including state filings where relevant.
C-Corp compliance for cross-border businesses.
Learn moreUS corporations with foreign shareholders — branch profits tax, withholding, and W-8 documentation.
Inbound investment & branch profits.
Learn moreAudit the current entity, ownership, and where revenue / expenses sit. Identify any cross-border structuring that's costing more than it saves.
If structure needs changing — mid-year or for next year — file the elections (Form 2553, 8832) on the right timeline.
Draft the federal return (1120 / 1120-S / 1065) with state returns where nexus exists, and produce K-1s for partners / shareholders.
Quarter-end estimated payments, distribution timing, and salary-vs-dividend planning for owner-operators.
Started as a single-member LLC, scaled to needing UK and US tax handling. TaxStone re-elected us as an S-Corp at the right moment and the payroll-tax savings paid for two years of fees.
Most engagements start from these.
Send us a one-paragraph description of your situation and we'll tell you which filings are actually on the hook.
