
Yes - generally you must not have received benefits under the Active Social Policy Act or the Integration Act in the four years before you apply, and you must be self-supporting.
Self-support is central to the permanent residence rules. Having drawn certain social-assistance benefits in the relevant look-back period can disqualify you, even if you otherwise meet the residence and language conditions.
This is one of the more common stumbling blocks, so it is worth checking your benefit history carefully before applying. You also have to sign a residence and self-support declaration as part of the process. Outstanding public debt above the set limit can also block an application.
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