You can't "merge" an inherited IRA into an IRA of your own.
If you are the spouse of the deceased, you have three choices.
1. Keep the IRA as an "inherited IRA" with its own separate rules.
2. Assume ownership of the IRA in your own name but keep it as a separate account.
3. Rollover the IRA into an IRA in your own name.
Maybe you did a rollover, and are calling it a "merge." In that case, after you enter the 1099-R from the IRA, there are some check boxes for different situations, answer that you did a rollover.
If you are any other relationship to the deceased owner, you can't merge, rollover, or convert the IRA into an IRA in your name. You might have tried to do that by withdrawing all the money, and contributing it to a new IRA in your name. If you did that, you have to follow all the laws on withdrawals and contributions. Specifically,
1. If you withdrew the money from a traditional IRA, it is subject to regular income tax. However, you don't pay a penalty if you are under age 59-1/2 because it was an inherited IRA.
2. If you made a contribution of money into a new IRA in your name, you may be able to take a tax deduction (depending on your income and other factors), but your contribution is limited to $7000 (or $8000 if you are over age 50) and you can only make contributions if you have compensation from working (generally this means wages or self-employment income).
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