Frequent business travel to Schengen region - which visa do I go for?

Because of the business requirements, I will have to visit the Schengen countries on a frequent basis for short time spans. The main reason of visit is travel and most of my trips will be to Germany and France, but this can change from visit to visit.
As per what I can see on the VFS Germany website for India, they only give a national visa to the following categories -
Work Permit, Student, German Classes, Family Reunion, Au Pair, Specialty Cook, Medical Treatment, Guest Scientist and Visiting Scholars.
I need to visit my clients and won't have a work permit. I have got Schengen visas multiple times previously, but for tourism. From which country do I apply for such a visa which will be valid for at least 2-3 years? Will there be a problem in case a year or so down the line I enter a country for business, for example Latvia, on this visa?
Best Answer
A national D visa would by required if you want to visit a Schengen state for more than 90 days out of any 180 days. For frequent short trips, the best would be a Schengen C visa with multiple entries and a very long duration.
Long, multiple-entry visa are given if there is a premise to justify them and if the applicant had shorter, possibly single-entry visa before without any problems.
Even if the duration was more than a year, the multi-entry visa would still be subject to the 90/180 rule, it just saves you the hassle of repeated applications. Is is possible to visit many different Schengen states with such a multiple-entry visa as long as it says "Schengen states" or the equivalent in the respective language. The premise for the initial trip needs to be documented in detail with the application. For later trips you should keep the medical insurance in mind, bring enough money to cover your cost of living, have a plan for onward travel, etc.
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Can Schengen tourist visa be used for business?
Visa holders can visit any country within the Schengen Area for tourism purposes. Holders of this type of visa are not permitted to carry out any business activities, study or obtain employment. Visa holders can visit any country within the Schengen Area for business purposes.What does Type D Schengen Visa mean?
4. Type D Schengen visa or national long-stay visa. The national visa is the type D long-stay Schengen visa. It is mandatory for any foreigner wishing to study, work or live in a Schengen country for longer than 90 days (up to 1 year).What are the 4 types of Schengen visas?
- Uniform Schengen Visas (USV) Single-entry visa. Double-entry visa. Multiple-entry visa.
- Limited territorial validity visas (LTV)
- National Visas.
- Schengen Visa Types according to purpose of travel.
- Difference between Visa Validity and Duration of Stay.
- 90/180 Schengen Visa Rule.
- Visa Sticker.
- Schengen Visa Extension.
What is a Type B Schengen Visa?
Category B: the Transit Visa. This Visa allows its holder to transit through more than one Schengen country on the way to a non-Schengen country. The holder of the Transit Visa is allowed to enter in the Schengen Area for a maximum of 5 days.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: mentatdgt, Matheus Natan, Thomas Ward, Muhammad Irfan