Can I add my remaining Schengen days to my new 90 days?

Upvote:4

No, Schengen days do NOT carry over. Under very few circumstance can you stay more than 90 days in any 180 day period with a short-stay visa.

Schengen Visa Code says:

In certain cases, the period of validity of a visa may be extended

They do not go into further detail than this, but adding days "because you didn't use them" will most definitely not work.

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