Netherlands Schengen Visa - Spain

In general, you should reuse your Netherlands-issued visa until it expires. There are some factors to consider, however.

First, is the visa valid? Your Spanish trip must end on or before the 1-year expiration date of the visa. That is, you may not remain in the Schengen area on or after that date. Also, since you have already used the visa once, it must be valid for two entries or for multiple entries. This will be indicated on the visa sticker with the numeral "2" or the abbreviation "MULT" (where a single-entry visa will show "1").

Second, is the purpose of your trip to Spain permitted under the visa? The answer to this question is probably "yes," but if it is not you must get a different kind of visa that authorizes a trip for your intended purpose. This does not appear to apply to business visitors re-using a multiple-entry visa that was originally issued for a tourist journey, or vice versa, but I cannot find anything authoritative to answer that question one way or the other.

Third, has enough time passed since your trip to the Netherlands? You must not have more than 90 days' presence in the Schengen area in any 180-day period, including the day on which you arrive and the day on which you depart. That means that on any given day, if you look at that day and the preceding 179 days, and count 91 or more days on which you were in the Schengen area, you are in violation.

More specifically, if you were, for example, in the Netherlands between the 1st and 30th of April, a total of 30 days, and you re-enter the Schengen area on or before July 29th, your second trip can last no more than 60 days, because the 61st day would be 179 days or fewer after you first entered the Schengen area, and the total number of days you were in the Schengen area would be 91. If you enter on or after July 30th, however, your second trip could last 90 days.

The 90/180 rule used to be calculated differently, so you may find conflicting explanations online. There is an official length-of-stay calculator here:

http://ec.europa.eu/dgs/home-affairs/what-we-do/policies/borders-and-visas/border-crossing/index_en.htm

To find the calculator, as of this writing, find the third paragraph of the main body text, and, in the first sentence, click the hyperlinked text "short-stay calculator." I can't find a link that opens the calculator directly.

Finally, you will always have to meet the general conditions of entry, and to convince the border officer that you meet them:

• You must be able to explain why you want to enter the Schengen area and to prove the conditions of your stay. You must also be able to show that you have sufficient financial means for the duration of the stay and for your return;
• You must not be considered to be a threat to public policy, internal security, public health or the international relations of any of the Schengen area countries;
• You must not have an alert issued in the Schengen Information System for the purposes of refusing entry.

The above list is taken from http://ec.europa.eu/immigration/do-i-need-a-visa/do-i-need-a-short-stay-visa_en#TheSchengenarea

If your Schenghen Visa will still be valid then you will not need to apply for a new Visa.

http://es.vfsglobal.co.uk/london/allaboutyourvisas.html