@farmerman,
If you attempt to "cash in" your gold at a bank, and this is cashed in at a rate greater than (it used to be 1000 a day) the bank, because it keeps records, will notify the IRS itself, if your transactions accumulate over a single tax year. SO, your really not gonna live the high life on a year where you cash in say 10000 dollars worth of appreciation at , say again, 10 transactions of 1000 each.
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I never even hear of cashing gold coins in at banks!!!!!!!!!! I may be wrong but the last time anyone cash in gold coins at an American bank was in 1929 or so.
If you mean money laundering the cash from selling gold coins let me point out that the regional FED branch located within biking distance of me take in more cash then all the other regional branches combine due to the fact that a few billion dollars of drug earning every year is somehow being turn from cash into bank accounts.
The banks and their reporting/record keeping to the Fed does not seem to be working too well.