What tax advisers help with
- Corporate and business tax planning within the rules.
- VAT and GST registrations, returns and cross-border rules.
- US sales tax: where you have “nexus” and must collect it.
- International structures, permanent establishment and double-tax treaties.
- Transfer pricing between companies in the same group.
- Tax investigations, enquiries and disputes.
- Incentives such as research and development tax relief.
Key cross-border rules to know
- EU VAT: the One Stop Shop (OSS) lets businesses selling to consumers in other EU countries report VAT through one registration. Imports up to €150 can use the Import One Stop Shop (IOSS).
- US sales tax: since the Supreme Court’s 2018 Wayfair decision, states can require remote sellers to collect sales tax once they pass economic thresholds, which vary by state.
- Transfer pricing: most countries follow the OECD Transfer Pricing Guidelines, based on the arm’s-length principle.
- Global minimum tax: the OECD Pillar Two rules target large groups with annual revenue of €750 million or more.
Credentials to look for
- UK: Chartered Tax Advisers (CTA) and members of the CIOT or ATT.
- US: CPAs, Enrolled Agents and tax attorneys can represent taxpayers before the IRS.
- Germany: Steuerberater; other countries have their own protected titles.
- Everywhere: ask about experience with your specific countries and transaction types.
What affects the cost
Complexity, the number of countries, deadlines and whether it’s a one-off question or ongoing compliance. Advisory work is often hourly or a fixed project fee; ongoing filings are often monthly or annual packages.
Last updated: 16 October 2026
