The first thing a Taiwanese buyer notices
Taiwan writes in Traditional Chinese. Arriving with materials in Simplified characters tells a Taiwanese buyer precisely how much homework you did, and it tells them before you have said a word.
It rarely produces an objection. It produces something worse: a quiet downgrade in how seriously the rest of your proposition is taken.
Simplified reads as a mainland catalogue nobody adapted
The characters are not a cosmetic difference. To a Taiwanese reader, Simplified materials signal that Taiwan was treated as an afterthought on a China plan — which, frequently, is exactly what happened.
The fix is inexpensive and the signal it sends is disproportionate to the cost.
Your company needs a Chinese name, and it is reserved first
If you register any vehicle in Taiwan, the Chinese company name and business scope are pre-reviewed and reserved with the Ministry of Economic Affairs before anything else happens.
This catches people twice: once because they had not planned for a Chinese name at all, and again because the name they wanted was unavailable and they had already printed materials around it.
Plan the calendar backwards from Lunar New Year
Nothing moves in Taiwan for roughly a week around Lunar New Year, and very little moves in the week before it as everyone closes out. The date shifts between late January and mid-February.
Every year somebody schedules a decisive meeting or a first shipment into that window and loses a month. Work backwards from it when you plan a launch.
None of this is about politeness
These are not etiquette points. They are evidence, and the people you are trying to persuade read them as evidence: that you have done the work, that Taiwan is a market to you rather than a line item, and that you intend to still be here in three years.
The companies that get taken seriously here are usually the ones who got these small things right before they asked for anything.