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  United States Taxation

The real complexity here is multi-state: federal is a flat 21% C-corp rate, but economic nexus can create income, franchise and sales-tax obligations in states you've never set foot in.

What we file & when

Key United States filings.

Federal corporate income tax returnTypically due the 15th day of the 4th month after year-end; extensions available.
State income & franchise tax returnsDue dates and rules vary by state — the multi-state footprint is usually the real work.
Sales tax returnsMonthly or quarterly per state once economic nexus is triggered.
Payroll & information filingsFederal and state payroll returns, plus 1099 information reporting.

Typical deadlines under standard rules — actual dates shift with extensions, agent arrangements and entity type. We confirm your exact filing calendar at engagement.

Full tax scope

Everything under taxation.

The complete list — individual returns, corporate returns, registrations, indirect tax and disputes — delivered for United States through the IRS and state departments of revenue.

Individual income tax returns

Personal tax returns for residents, non-residents and expats — employment, business, rental, investment and foreign income, filed correctly in each country you touch.

Corporate & company tax returns

Preparation and filing of company income tax returns — C-corps, limited companies, subsidiaries and branches — with workpapers that survive review.

Tax registrations

Getting you correctly registered wherever an obligation exists: federal and state registrations, VAT/GST numbers, employer accounts and e-filing portals.

Cross-border structuring & planning

Designing how your entities, contracts and cash flows sit across countries so you pay what the law requires — and not more.

Transfer pricing documentation

The intercompany pricing files (local file, master file, benchmarking) tax authorities demand when related companies trade with each other across borders.

Economic nexus & US state taxes

Working out where your sales or presence have quietly created a US state obligation — income, franchise and sales tax — then registering and filing where it matters.

Indirect tax — VAT / GST / sales tax

Registration, periodic returns and advisory for VAT, GST and sales-tax regimes in every market we cover.

Withholding tax & treaty relief

Getting cross-border payments (dividends, royalties, service fees) taxed at the correct treaty rate instead of the default — with the certificates to prove it.

Tax residency & permanent establishment

Advice on where you and your company are actually taxable — residency tests, PE risk from remote teams, and how to structure around both.

Expat & remote-founder tax

Coordinated home-and-host-country filings for founders and professionals living outside their passport country.

Advance / estimated tax computations

Quarterly and advance tax estimates so instalments are right-sized — no penalties, no interest-free loans to the government.

Tax notices, audits & disputes

Responses to authority notices, audit representation and appeals — measured where compliance is the answer, firm where the demand is wrong.

Tax due diligence

The tax workstream of a deal: exposures quantified, positions reviewed, and warranties negotiated with real numbers behind them.

Group tax reporting & deferred tax

Current and deferred tax provisions for financial statements, prepared to audit standard alongside our accounting advisory team.

How remote engagement works

Fully remote. We prepare returns and workpapers; filings are submitted through authorised e-file channels, and a US-licensed signatory is arranged where a filing legally requires one.

Pricing approach

Fixed annual fee for federal + agreed states; nexus studies and clean-ups quoted per scope.

Questions

United States tax — your questions

Do you handle multi-state sales tax? +
Yes — nexus analysis first, then registrations and the recurring returns in each state where you have an obligation.
Can you work with our US CPA? +
Yes. We often prepare the workpapers and returns while a US CPA firm signs and files — a common and efficient split.
What are the current federal and state rates? +
The tax estimator on this site models the federal C-corp rate and typical state rates. For a filing position we confirm against IRS and state sources at the time of the engagement.

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