My brother had his tax check seized last year but he was all paid up on his back chils support. We want to make sure that this doesn't happen again this year. How can me make sure that there areno liens on in tax return this year so that it is not taken?

Unfortunate, but the gov does what it does. He could not have been all paid up, or the gov would not have taken the extra money. He can make sure there are no leins by being, just, well, up on his payments and child support payments.

I really hate dead beat dads. That's what we call them over the border.
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He is not a dead beat and your assumption was very inappropriate. He had the baby as a teenager and securin decent employment at that time made it difficult to keep up with payments but he gave what he could. That was years ago and he has been paid up for over two years now, but they keep taking his check. I simply asked how to stop. I went with him to court and to the child support office before he filed last year and there was no back support on record. They assured him they would not take his tax return, but did it anyway. His balance is still zero. We just want to make sure that this doesn't happen again this year. Im just asking how?

He is not a dead beat and your assumption was very inappropriate. he had the baby as a teenager and securin decent employment at that time made it difficult to keep up with payments but he gave what he could. That was years ago and he has been paid up for over two years now, but they keep taking his check. I simply asked how to stop. I went with him to court and to the child support office before he filed last year and there was no back support on record. they assured him they would not take his tax return, but did it anyway. His balance is still zero. We just want to make sure that this doesnt happen again this year. Im just asking how?

If he's paid up, they won't take his check - simple as that.

Typically the intercept letter will state what the taxes are being intercepted for and include the case number. Is he positive his check is being intercepted for the same case? He needs to find that out; someone may have named him as the father of their child and if he didn't show up to contest it, he may have been given that responsibility. So he might be current on this case but behind on the other.