How is a law firms business taxed across borders?

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Answer

Legal work is performed where the lawyer is, so an office or a seconded lawyer abroad can create a taxable presence, while trust and client-account signing authority creates personal reporting for the individuals. The first foreign obligation in this sector is rarely income tax, which is why it is discovered late.

The rule for this sector

Legal work is performed where the lawyer is, so an office or a seconded lawyer abroad can create a taxable presence, while trust and client-account signing authority creates personal reporting for the individuals.

Two of the firm’s advisers at a desk in the Delhi office

Where it does not apply

Our lawyers travel to matters abroad and nobody counts the days.

How is a law firms business taxed across borders?
ItemAmount
Annual salaryC$229,000
Working days in the year243
Days worked in the other country76
Days worked at home167
Income sourced to the other countryC$71,621
Income sourced at homeC$157,379

C$71,621 is sourced abroad on this split, which is the figure the host country taxes and the figure the home credit is computed on. Reproduce this from a travel record, not from memory — it is the first thing an auditor asks for.

Example figures throughout, selected to make the rule visible, with rates and thresholds assumed for the demonstration. Your actual filing uses figures confirmed with the issuing authority for your tax year.

How to get this moving

The full treatment — who it binds, the deadline, the penalty and the fixed fee — is on Cross-border tax for law firms. If you already have an adviser, we will tell you what they should be asking rather than replacing them.

Reviewed for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. General information, not advice for your circumstances — call our 24-hour helpline to discuss your own position.

Tax and law — what this page covers

The search that brings most people to this page is tax and law. It is answered here for law firms: what creates the obligation, which filings discharge it, and the fee agreed before the work starts.

Files that look like this one

Case study 1

Travel record built so day counts could be evidenced rather than argued

Lawyers travelled to matters in several countries and expense claims were the only record of where they had been. Those claims showed spending, not dates or duration, and two of the countries apply rules that turn on days present. We reconstructed the open years from client files, flight bookings and matter narratives, converted them into a day count by lawyer and by country, and identified the one country in which the count passed the point at which short-visit relief falls away. The engagement produced a reconstructed record for the open years, the filings that followed in that country, and a travel log the firm now completes at the time of booking.

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Case study 2

Secondment to a foreign office structured before the lawyer moved

A partner was to spend an extended period in the firm's office in another country, and the arrangement had been settled commercially before anyone asked what it would cost in tax. The host office was to bear the remuneration, which removes the relief the firm had assumed would apply. We set out the conditions for relief, tested the proposal against each, and priced the alternative of host payroll and local filing from the start. The engagement produced a written position on the secondment, host registrations completed before the move rather than after it, and a set of questions the firm now asks whenever a lawyer is placed abroad.

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Case study 3

Signing authority over client accounts mapped to personal reporting duties

Several partners and two members of the finance team held signing authority over client and trust accounts in another country, and none had considered whether that authority was reportable in their own names. We established which accounts each individual could operate, when the authority had been granted, and what the reporting rules of each person's country of residence required of someone in that position. The work produced a schedule of accounts and signatories, the outstanding personal reports for the individuals who owed them, and a procedure that puts the question to every new signatory at the point authority is granted.

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Case study 4

Matter-level sourcing prepared to support a questioned allocation

A foreign authority questioned the share of profit the firm had reported as arising in its country. The firm's allocation was driven by profit-sharing percentages that had nothing to say about where work had been performed. We rebuilt the sourcing from matter records — which lawyers worked on which matters, from which country, and for how long — and set that alongside the commercial allocation to show how the reported figure had been arrived at. The engagement produced a matter-level sourcing analysis for the years under review, a written response to the authority, and a reporting pack the firm now prepares each year alongside its accounts.

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Case study 5

Presence assessed for a country visited repeatedly on one matter

A single matter had taken the firm's lawyers into the same country repeatedly over two years, each visit short enough that nobody considered it. Presence provisions look at the continuity of an engagement as well as at individuals, so the visits had to be assessed together rather than one at a time. We built the timeline of the matter, aggregated the presence of every lawyer who worked on it in that country, and tested the result against the provisions that country applies to services. The result was a documented assessment, a filing covering the period the aggregation reached, and a rule that any matter requiring repeat travel is reviewed at the outset.

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Case study 6

Foreign office opened and its profit attribution documented at the outset

The firm opened an office abroad and needed a basis for deciding what profit belonged to it before the first return fell due. Work would be shared with the home office, clients billed centrally, and partners in two countries would take shares of the result. We documented the functions each office performs and the people in each, built an attribution from time and cost records rather than from the billing entity, and confirmed how each partner's own country would treat the share arising there. The engagement produced an attribution method, the office's first corporate and payroll filings, and per-partner statements supporting their credit claims at home.

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Case study 7

A US LLC Owned by a Canadian, Taxed Twice by Design

The two countries classify an LLC differently, so the credit relief that ought to apply frequently does not. The engagement looks at whether the structure can be changed, and where it cannot, at how to make the credit work.

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Case study 8

One Employee in a State Nobody Had Registered In

A single person working from home can create payroll registration, withholding and sometimes an income tax filing for the company in that state. The review measures activity against each state's own threshold.

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What people ask us about Law firms

Our lawyers travel abroad for matters and nobody counts the days — is that a risk?

It is, because the day count is the evidence and the firm does not hold it. Almost every question that follows — whether a lawyer became taxable in the country worked in, whether the firm acquired a presence there, whether relief for a short visit is available — turns on where people were and for how long. A revenue authority can establish that from immigration and client records. A firm that cannot produce its own version is left arguing against the authority's. The record need not be elaborate: dates, country, matter and who travelled, captured as the travel is booked rather than reconstructed from expense claims two years later.

Does seconding a lawyer to a foreign office create a taxable presence?

It can. Legal work is performed where the lawyer is sitting, so a lawyer placed in another country for a sustained period is the firm carrying on its business there rather than visiting. Whether that becomes a taxable presence depends on duration, continuity and what the lawyer actually does — advising the firm's clients on the firm's matters is the firm's business; attending a course is not. A secondment also raises a separate employment question, because the host country may tax the remuneration from the first day, particularly where the host office bears the cost. The two questions have different tests and both should be answered before the lawyer moves.

Do I have to report a client trust account I sign on abroad?

Signing authority is usually enough to bring an account within a personal reporting obligation, even where none of the money is yours and you hold no beneficial interest in any of it. That is the point commonly missed on client and trust accounts: several countries frame their reporting rules around authority over an account rather than ownership of its contents. The consequence is that the duty falls on the individual who signs, not on the firm, and any penalty attaches to that person. Partners and finance staff holding authority over accounts held in another country should each be asked the question directly, because nothing in the firm's own filings will surface it.

Where is legal work taxed when the lawyer flies in to do it?

In principle in the country where the lawyer does the work. That is the starting rule, and treaty relief is the exception to it. Relief for a short visit typically depends on the length of the stay, on the remuneration not being borne by an entity in that country, and on the firm having no presence there; fail any one of those and the country can tax the portion of the lawyer's income earned on its territory. The firm then has a second question of its own, because sustained visits on the same matter can amount to a presence for the firm even where each individual lawyer still qualifies for relief. Days are counted for both tests, on different bases.

Our income allocation does not match where the work was done — does that matter?

Yes, and it matters most when a foreign authority looks at it. Where partnership income keeps its source, the country in which work was performed can claim a share, and the figure it expects to see is the one supported by the firm's own records of who did the work and where. An allocation driven by seniority, by originations or by historical shares is a perfectly defensible way to divide profit between partners, but it is not by itself evidence of where the income arose. Firms that keep the two things separate — a commercial allocation, and a documented sourcing of the income behind it — have far less difficulty when a return is questioned.

Does opening a foreign office change how our partners are taxed?

It changes what has to be filed and often who files it. An office is the clearest form of taxable presence, so the firm will have a filing in that country, a payroll for anyone employed there, and a basis on which profit is attributed to the office. Where the partnership is transparent, partners may themselves acquire filing obligations in that country in respect of the income arising there, whether or not they have ever worked in it. Their home countries then tax the same income and give credit for what was paid. The attribution method agreed when the office opens is the thing every one of those filings depends on.

Do US citizens abroad have to report foreign bank accounts?

Yes, and under two separate regimes with different thresholds and different filing homes — one report to FinCEN covering foreign financial accounts, and one to the IRS with the return covering a broader class of foreign assets. Both are keyed to balances rather than income, so an account earning nothing can still require reporting, and each carries penalties of its own. See filing both.

What is a totalization agreement and how do I use one?

A social security agreement that stops you contributing to two systems for the same work, and lets periods in both count towards benefit eligibility in either. Which system you stay in depends on the agreement's rules for your situation — a seconded employee usually remains in the home system for a set period, a locally hired one usually joins the host system. You evidence it with a certificate of coverage obtained before or shortly after the assignment starts. See certificates of coverage.

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