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US Individual & Business Tax Returns
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US Individual & Business Tax Returns

Federal and state tax preparation for high-net-worth families, complex partnerships, and corporate entities.

US Individual & Business Tax Returns

50+

State Jurisdictions

The tax return is where planning becomes a matter of record. For high-net-worth individuals and multi-entity businesses, it is a legal document: it has to hold up under review while claiming every position established during the planning phase.

We prepare federal and state returns for all jurisdictions, with particular depth in the reconciliations that closely held businesses, real estate holdings, and complex individual portfolios require. Every Form 1040, 1065, and 1120 we file is prepared and checked with care.

Our Methodology

How we deliver this service.

A rigorous, phase-driven process ensures nothing is missed and every position is defensible.

01

Data Integrity Audit

We review your financial data (QBO, Xero, trial balances) in detail to confirm the book-to-tax reconciliations are accurate.

02

Technical Preparation

Our senior practitioners prepare the return, mapping every item to the proper IRS schedule and identifying state-specific adjustments.

03

Quality Control Review

A second reviewer checks every return, verifying the calculations and confirming compliance with current tax law.

04

Liability Forecast & Modeling

Before filing, we model your final liability and project next year's estimated payments so you avoid underpayment interest and penalties.

05

Electronic Submission

We handle the secure electronic filing of all federal and state returns and confirm acceptance as soon as it comes through.

06

Permanent Record Retention

You receive a complete, organized 'Tax Pack' with all filed forms, worksheets, and substantiation documents for your records.

Flow-through entities, done properly.

Business Compliance

Closely-Held Business Reporting

Flow-through entities, done properly.

Most modern businesses operate as flow-through entities: S corporations, partnerships, or LLCs. The hard part of these filings is preparing the Schedule K-1s that pass income, credits, and deductions to owners. We handle basis tracking under Section 704, debt allocations, and the at-risk rules that determine whether losses are deductible.

For C corporations, we prepare the full Form 1120, including M-1 and M-3 reconciliations, net operating loss (NOL) carryforwards, and corporate tax credits such as the R&D Tax Credit (Section 41).

Entity specialization: Form 1120 (C-Corp), Form 1120-S (S-Corp), Form 1065 (Partnership), and complex distributive share (K-1) reporting.

Form 1040 for the high-income professional.

Individual Strategy

Professional & High-Income Filings

Form 1040 for the high-income professional.

For high-income professionals and business owners, Form 1040 is rarely simple. We handle the reporting of stock-based compensation (ISO, RSU, NQSO), multi-state K-1 income, and itemized deductions in a post-TCJA environment, so that your individual return reflects every efficiency established in your personal and business planning.

We also run the Alternative Minimum Tax (AMT) calculations and keep documentation to the standard needed to defend your Schedule C or Schedule E positions under IRS examination.

Individual focus: Form 1040 individual income, Schedule E rental/royalty, Schedule C business, and multi-jurisdictional state credits.

Compliance across all 50 jurisdictions.

State Compliance

Multi-State Nexus & Apportionment

Compliance across all 50 jurisdictions.

Operating in multiple states triggers 'nexus', the requirement to file and pay tax in jurisdictions beyond your home state, and raises the question of how income is apportioned between them. We also look for state-specific incentives and credits that can offset those multi-jurisdictional liabilities.

We handle the annual filing of state income, franchise, and gross receipts tax returns, including specialized filings for New York (MCTMT), California (FTB), and other demanding states, so you avoid local non-compliance penalties.

Nexus specialization: Multi-state apportionment modeling, state-specific tax credit reviews, and franchise tax return preparation.

Ready to file?

Work with a team that prepares returns to a technical standard, documents every position, and stands behind the filing if it is examined.

What You Receive

Specific deliverables, precisely documented.

“A tax return is a legal position. Every line item we file is substantiated and documented.”

Federal Form 1040/1041

Individual and trust returns prepared with all required supplemental schedules.

Partnership Form 1065

Schedule K-1s distributed to partners with accurate basis and at-risk reporting.

Corporate Form 1120/1120S

C-Corp and S-Corp federal filings with full support for book-to-tax (M-1) reconciliations.

Multi-State Return Set

Returns for every state where nexus is established, prepared with local credits in mind.

Estimated Payment Vouchers

Quarterly vouchers (Form 1040-ES / 1120-W) based on safe-harbor rules and projected income.

K-1 Basis Reconciliations

Detailed tracking of partner and shareholder basis so losses stay deductible and distributions stay tax-free.

Permanent Tax Pack

An organized file of all returns and supporting worksheets for your annual records.

E-File Acceptance Proof

Confirmation receipts from the IRS and state tax authorities for every electronic submission.

Common Questions

Technical clarifications.

Answers to the most frequently asked questions about how this service works in practice.

We typically need your financial records (trial balances, P&L, balance sheets), a list of all income sources (W-2, 1099, K-1), and documentation for any large transactions or business expenses.

Yes. We file in all 50 US states and thousands of local tax jurisdictions, and we know the nexus rules that determine where you are required to file.

Yes. We pull your IRS transcripts, identify the missing years, and prepare all historical returns to bring your account back into good standing.

Tax planning happens before the year ends and focuses on decisions that lower your tax. Tax preparation happens after the year ends and reports the results of those decisions accurately.

Every return we prepare is documented with a possible audit in mind. If you are selected for examination, our IRS Representation practice can take over the defense using our internal working papers.

Contact US/UK Cross Border Tax

Two Tax Systems, One Team

London Headquarters

4 Crown Place
London EC2A 4BT
United Kingdom

Manchester

CORE
Brown St, Manchester M2 1DH
United Kingdom

San Francisco

600 California St
San Francisco, CA 94108
United States

New York

33 Irving Pl
New York, NY 10003
United States

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