Can boyfriend claim my 3 kids as dependents if he supports them? SAHM with no income

This depends on several factors. For non-biological children, your boyfriend must meet the qualifying relative test. The children must have lived with him for the entire year, he must provide more than half their support, and they can't have earned more than $4,400. For your shared biological child, he can claim them if they lived with him for more than half the year and he provided more than half their support. Just living together doesn't automatically qualify him - documentation of financial support is crucial.

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careful with this! my friend tried claiming her bfs kids and got audited big time

Does the biological father of the older 2 kids claim them on his taxes? That could be an issue

Make sure u have proof he pays for everything! receipts bills everything

ngl this is kinda risky. the irs looks really close at non-parent claims especially with eic involved