Why is the client withholding tax on my whole installation invoice?
Because the deduction is normally applied to the payment rather than to the profit. A payer told to withhold on a service fee will often do so on the invoice total, which sweeps in parts, freight and travel that were never your margin. That is why the amount held back can exceed the tax finally due on the job. Two routes exist. Reduce the withholding in advance, where the host country allows an application. Or recover the excess by filing a return in that country and paying on the net result. The second route works, but it returns the cash a long way behind the invoice.
Can I get the withholding reduced before the client pays the invoice?
Often yes, and this is the part worth doing early. Many host countries will consider an application to reduce or waive withholding on a service payment where the applicant can show the expected profit is a fraction of the gross, or that the treaty limits what may be taxed. The application has to be lodged before payment to be of any use, and it takes time to be decided. Once the money has been deducted, the only remaining route is a return. Build the application into the project timetable alongside mobilisation, not after the first invoice has already been paid short.
Should parts and freight be invoiced separately from the labour?
It is usually worth separating them, though the invoice alone will not decide the outcome. Where the contract distinguishes the supply of goods from the services performed, there is something to point at when arguing that the withholding provision reaches the service fee rather than the equipment and the shipping. A single lump sum gives the payer nothing to work with, and they will deduct on all of it. Set the split out in the contract, keep the supplier invoices for the parts, and make sure the commercial documents and the tax position tell one story.
Our waiver application was never filed and the cash is stuck — what can we do?
The deduction cannot be undone retrospectively, so the route is a host-country return that computes tax on the net result of the work and reclaims the difference. That means preparing accounts for the activity in that country: the fee, the cost of the parts, the travel, the engineers' time. Two things are worth doing at the same time. Lodge the application for the next payment, so the same money is not tied up twice. And revisit the home-country return, because a credit claimed for tax that is later refunded has to be corrected.
Do my commissioning trips make me taxable where the plant is?
Possibly, and on two separate footings that are easy to confuse. The deduction from the company's service fee is one question. Your own position as an individual is another: whether the time you spend at the plant makes your employment taxable there, and whether your employer's presence at that site amounts to something the host country can tax. A year of short commissioning trips can add up to more time abroad than at home without anyone tracking it. Keep a dated record of every trip, because it is the only evidence that settles either question.
Which country do I claim the credit in for tax withheld abroad?
In the country where you are resident, and generally for the year the foreign tax belongs to rather than the year the cash moved. The practical problem with gross withholding is timing. The deduction happens on payment, the host-country return that fixes the real liability comes later, and any repayment later still. A credit claimed on a figure that is afterwards reduced leaves the residence-country return wrong. The tidier sequence is to settle the host-country liability first where you can, then claim the credit on the final figure, amending only if you must.
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.
Is double taxation legal?
Yes. Nothing prevents two countries from taxing the same income under their own domestic law — each is exercising its own jurisdiction. What treaties and credit systems do is relieve the outcome rather than prohibit the charge, and relief is generally something you must claim on a return or a form, not something applied automatically. Miss the claim and the double charge stands. Double taxation explains the mechanism.
