About Us

Tier criteria

Tier 1

Tier 1 firms are the 'go-to' firms in their jurisdiction and are praised by taxpayers and peers alike as market leaders in all key areas of tax: planning, transactions, transfer pricing, indirect taxes and litigation. They have specialists working with clients in all industries, and this is reflected by the size, spread and quality of transactions detailed in the questionnaires.

Tier 2

Tier 2 firms have a strong reputation in their own jurisdiction and are praised by taxpayers and peers for their work in all key areas of tax. They have strong practitioners able to give solid advice to clients across all or most industries, as evidenced by the information provided in questionnaires and feedback from clients.

Tier 3

Tier 3 firms have a good reputation in their own jurisdiction, and are well thought-of by taxpayers and other firms. They have specialists in most areas of tax, and have partners able to offer advice across several industries.

Tier 4

Tier 4 firms often operate in a niche area, having a strong reputation in one particular aspect of tax, such as transactional work or litigation, or offer a full range of services to clients in specific industries.

Welcome to World Tax, International Tax Review's guide to the world's leading tax advisory practices, including law and accountancy firms.

The annual World Tax guide is a key resource in assisting tax professionals locate specialist advice. Each edition rates the tax expertise offered in various jurisdictions, giving tax executives the most comprehensive information about the market for tax advice.

As you peruse the guide, you will find that we have added extra rankings tables detailing firms' prowess in indirect tax, transactional tax and tax disputes.

World Tax is unique as it classifies professional services, law firms and other tax advice providers together, rather than looking at them separately, because they undoubtedly compete for work.

How to take part in the research

To take part in the annual research simply download, complete and submit our RESEARCH FORM.

You can submit your research form using our ONLINE PORTAL.

Submissions are due on MARCH 30 2018.

You can submit one research form for each jurisdiction in which your firm is active.

PLEASE NOTE - The research form is a combined one allowing you to submit for both the World Tax and World Transfer Pricing research at the same time.

For more information please view our Frequently Asked Questions.

If you are a tax practitioner you can also take part in our PRACTITIONER SURVEY.

Research schedule

Research begins - January 2018

Submission deadline - March 30 2018

Research interviews conducted with practitioners and clients - April-June 2018

Rankings published - September 2018

Leaders Guides

Each year we also produce three individual guides recognising the abilities of individual practitioners. Inclusion in the guides is based on either recommendations received from market practitioners, client feedback or evidence of best practice in their work.

The relevant guides are:

  • Indirect Tax
  • Tax Controversy
  • Women in Tax

If you are a tax professional you can have you say and nominate individuals by taking part in our PRACTITIONER SURVEY


Our research is entirely free and independent and no firm or professional can pay to be included.

Our rankings are based on three key criteria:

Work evidence

We ask all firms to provide deal and case highlights from their last 12 months of work.

Peer feedback

No one knows more about the tax market than those professionals who work in it.

We conduct a PRACTITIONER SURVEY of tax professionals to get their thoughts and feedback on our existing rankings and to get nominations for the Leaders Guides. All active legal tax professionals are invited to take part and we also speak to a great number of professionals through phone and face-to-face interviews.

Professionals cannot recommend their own firm or colleagues in their own firm.

Client feedback

We speak to a wide range of corporate and in-house contacts as part of our Client Feedback Survey to get their opinions on the firms and professionals they use.

We ask for feedback on the following attributes:

  • Technical ability
  • Accessibility and communication
  • Depth of team
  • Value for money
  • Client/lawyer relationship
  • International network

World Transfer Pricing

TP Week, International Tax Review's online-only publication about transfer pricing, publishes its own directory about advisers, lawyers and providers in that market. Please refer to it at www.worldtransferpricing.com if you are looking for more depth in this area.