Yes, after your father passes away, you can disclaim your share.
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The disclaimer will need to qualify under both the laws of the state in which your father dies (check with the estate attorney) as well as under IRS regulations. The IRS rules require the disclaimer be filed within nine months of death and before you have accepted any benefit from the assets left to you. If the estate attorney cannot assist you, you will want to consult with your own attorney to make sure the disclaimer is "qualified" under both laws.
Yes, a qualified disclaimer is all that is required and it passes as if you predeceased your dad. The disclaimer is to be used to avoid you having to make a gift of what you get and using up your gift tax exemption, so it is imperative to make sure you meet all the requirements of a qualified disclaimer as defined under both federal and state law.
Hope this helps.
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