Because in Georgia there is a transfer tax based on the value of the transfer which is to be collected at the time of transfer. There are limited exceptions, for example, a transfer between spouses. Its not clear from the information whether a transfer tax would have been due or whether there may be an effort to collect it at a later date.
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Most deeds have lingo noting the "consideration". Not sure of the full history but Warranty Deeds typically list $10 and other good and valuable consideration, QCD's usually have $1. That's the deed, but what the clerk was really asking is how much $$$ was exchanged for the property? As noted, it's due to the transfer tax of $1 per thousand ($10,000 sale = $10, $100,000 = $100)
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There is a tax on the sale of real estate. They ask for the amount of consideration so that they can compute the amount of tax owed.
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