Talk to the people who would run your file: fixed fees agreed in writing before work starts, and a named adviser who answers for it.
Everything about how this practice runs comes from one decision: the fee is agreed in writing before the work starts, and it does not move.
Below: how the practice runs, what clients ask first, two worked files with their numbers, the process end to end, and the published fee.
Everything about how this practice runs comes from one decision: the fee is agreed in writing before the work starts, and it does not move. That single commitment sets the scope conversation, the review standard and the way we say no to work we should not take.
Start with the mechanism, not the form. What separates a good outcome here from an ordinary one is rarely the arithmetic. It is knowing that a specific rule exists for how we work — secure and personal and being able to evidence that it applies.
I have been quoted by the hour before and had no idea what the final number would be.
I want to know who is actually reviewing my return, not which brand is on the letterhead.
My last accountant did not understand the second country at all.
Every one of those is a question we answer weekly. They arise because two tax systems were written independently and neither was designed with the other in mind. See also why fixed fees, not hourly rates.
The same point, with figures rather than adjectives.
Take C$72,000 of income taxed in both countries. Assume the other country charged 24% on it and the home country would charge 28% on the same amount.
| Item | Amount |
|---|---|
| Income taxed in both countries | C$72,000 |
| Tax paid abroad (assumed 24%) | C$17,280 |
| Home tax on the same income (assumed 28%) | C$20,160 |
| Credit available (lesser of the two) | C$17,280 |
| Home tax still payable | C$2,880 |
The credit absorbs C$17,280 and leaves C$2,880 payable at home, because the home rate on this income is the higher of the two. The balance is real cash and it is due on the home timetable, which is why instalments get raised in the first meeting. The shape of that result holds; the size of it depends entirely on your own numbers and dates.
Treat these numbers as a worked example rather than advice — they exist to make the mechanics visible, and the rates and thresholds are assumed for the illustration. For a real filing, we verify each figure with the authority that publishes it, for your year.
The same point, with figures rather than adjectives.
Take C$141,000 of income taxed in both countries. Assume the other country charged 19% on it and the home country would charge 31% on the same amount.
| Item | Amount |
|---|---|
| Income taxed in both countries | C$141,000 |
| Tax paid abroad (assumed 19%) | C$26,790 |
| Home tax on the same income (assumed 31%) | C$43,710 |
| Credit available (lesser of the two) | C$26,790 |
| Home tax still payable | C$16,920 |
The credit absorbs C$26,790 and leaves C$16,920 payable at home, because the home rate on this income is the higher of the two. The balance is real cash and it is due on the home timetable, which is why instalments get raised in the first meeting. We run this on your actual numbers before advising anything, because the conclusion can invert with a modest change in inputs.
An illustration, not a client file. The sums are chosen for legibility and the thresholds are stated for the example alone — nothing reaches a filing until it has been confirmed at source for your own year.
One call is usually enough to know whether this is a filing or a project.
Reviewed against current guidance for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. Written as general guidance, not as a recommendation for your situation. Talk it through with us before acting on it.
Most readers of this page are looking for international tax accountant. What follows sets out how it works for how we work: who is caught by it, what has to be filed, and what the work costs, agreed before it begins.
The client described a straightforward employment return and asked for a price on the call. The documents were listed first instead: slips from two countries, a pension statement nobody had mentioned, and an account abroad that had been open for years. The scope was then written against that list, with the reporting obligation the account created priced as its own item so the client could see what it was for and why it existed. The engagement produced a filed return, the separate reporting the facts required, and a final fee that was the fee originally quoted.
Preparing the current return revealed a prior year that had never been filed, which sat outside the scope agreed. Work stopped there. The position was put in writing, covering what the missing year appeared to contain, why it mattered to the current one, and what dealing with it would cost, and the client decided. They took it. The engagement produced two filed years instead of one, a carry-forward figure that could be evidenced rather than assumed, and no invoice that differed from what had been agreed in advance of the work.
The file was finished, signed off by the preparer and ready to go, and the reviewer stopped it. The credit for foreign tax was arithmetically correct, but the working did not show which income it attached to, nor that the foreign amount was final. It went back. The assessment from the other country was obtained, the credit was reattached to the income it belonged to, and one figure changed. The engagement produced a filed return whose every claim can be traced to a document, and a working paper that explains it to anyone reading the file later.
An executor, a beneficiary abroad and a lawyer were each asking for figures at different times and each receiving slightly different answers, because every request was being answered separately. The work was reorganised around a single schedule that all three received, updated in one place, with questions answered to everyone at once. Decisions were recorded as they were taken rather than reconstructed at the end. The engagement produced the estate's filings, a distribution each party could check for themselves, and a record of who agreed to what and when.
A company was about to place an employee across a border and asked what to do, which is the rare and useful order of events. The duties, the entity bearing the cost and the intended pattern of travel were settled first, then the registrations and certifications were obtained before any pay was processed. The alternative, which is how most such files arrive, is correcting periods already run. The engagement produced a payroll set-up documented at the outset, the certifications on file to support it, and a first pay run that did not have to be reversed.
The client suspected several years were wrong and had no idea how bad it was, which made agreeing a fee for the whole exercise impossible for both sides. So the work was split. The first stage established how many years were affected and what the tax would be, at a fee fixed for that stage alone. The client then decided, on a known position rather than a fear, whether to go on. The engagement produced a quantified picture before any commitment to the larger piece, and a second stage priced in writing once there was something to price.
A single remote employee can create payroll registration, withholding and social security obligations in their country, and sometimes a corporate presence too. The review sets out each obligation and the order they have to be registered in.
Read how this one runsThe two countries classify the vehicle differently, so relief that ought to apply frequently does not and the same profit can be taxed in both hands. The engagement examines whether the structure can be changed and what the change itself costs.
Read how this one runsAll case studies — every published engagement in one place.
Strategy and compliance for income, assets and families spread across borders.
Performance income is taxed where earned — Regulation 105 in Canada, withholding agreements in the U.S. — with special treaty articles overriding the usual rules.
Performance income is taxed where the performance happens, and the deduction is usually taken at source on the gross fee before expenses. Recovering the difference is a filing exercise in the other country, and it only works if the tour, the residency and the withholding certificates were documented while the work was being done.
On the first call we establish the scope — countries, years, entities, filings — and quote a fixed fee for it in writing. If the scope changes we re-quote before continuing, and nothing is filed until you have approved it.
That is how most of these engagements run. They keep the domestic file, we take the cross-border piece, and the boundary is agreed in writing so nothing is done twice or missed.
The fee agreed in writing holds for the scope agreed in writing. If something turns up outside it, such as an unfiled year nobody mentioned, a second country's reporting obligation, or a corporation behind what was described as personal income, the work stops and the position is put to you before anything further is done. You then decide whether to extend the scope, at a fee agreed the same way, or to leave that part alone. What does not happen is a larger invoice at the end explaining that the file was more involved than expected. Scope is ours to manage, not yours to absorb.
By looking at enough of it first. A quote given from a description of the situation is a guess; a quote given after the documents have been listed is a scope. So the order runs: the facts and the dates, then a review of what actually exists, then the fee in writing against a stated list of what is included and what is not. That review is where the surprises usually surface, whether a year that was never filed, income in a third country, or a form the previous adviser did not know applied. Better for both sides that they surface then rather than halfway through.
Somebody other than the person who prepared it. A preparer reading their own work checks the arithmetic and misses the assumptions, because the assumption is what they made in the first place. The review looks at the position rather than the totals: whether residence was determined on the documents, whether the treaty article relied on is the one that applies to that type of income, whether everything reportable was reported, and whether the figures on the two countries' filings agree with each other. If the reviewer cannot follow how a number was reached, it goes back before it goes out.
Yes for most filings, and that is the ordinary route here: the return and the authorisations are signed electronically and the signed copies are kept with the file. A few things still need a wet signature or an original document, and those are identified when the scope is written rather than discovered against a filing date. The signing step is also the last point at which you can ask a question and get an answer before the position becomes a filed one, so it is worth reading what you are signing rather than clicking through it.
They stay with the file, because a cross-border position is only as good as the evidence behind it and the question usually arrives long after the filing. A residence determination, a valuation used on departure, a foreign assessment supporting a credit: each may have to be produced years afterwards, and reconstructing them from memory is not a position. You receive the filed copies and the workings. Ask, at the end of any engagement anywhere, what has been retained and in what form. An adviser who cannot answer that has given you a return rather than a record.
Ask about the mechanism rather than the credential. Describe your facts and ask which rule decides them, and why that rule rather than the default. Somebody who has run the file answers in terms of the specific provision and the evidence it needs; somebody who has not answers in general terms about the tax system. Then ask who would be named on your file and who would review it. Then ask what would take the work outside the fee. The answers to those three questions tell you more than any list of services on a website ever will.
A branch keeps one taxpayer: results consolidate at home, losses are usable sooner, and the exposure is that the branch is a permanent establishment whose profit the host country taxes, sometimes with a branch tax on repatriation. A subsidiary is a separate taxpayer with limited liability and local rates, at the cost of withholding on dividends home and transfer pricing on everything between them. The deciding facts are usually expected losses, liability and exit plans. See branch against subsidiary.
Frequently yes, and the two filings do different jobs. The country where the income arises taxes it at source; the country where you are resident taxes your worldwide income and then gives credit for the tax already paid. Filing only one side is what leaves relief unclaimed — the credit has to be asked for on a return. We prepare both sides so the numbers agree. See dual filing.
Where our partners studied — CPA Canada (In-Depth Tax Program), AICPA, the Institute of Chartered Accountants of India and the Malaysian Institute of Accountants.
