This might be the problem. My card was denied at a store for a $3.74 purchase. I knew I had more than $1000 left from last months purchase and this month's purchase. When I called they said that that there was an additional $4000 hold from the us govt - even though the actual charges had posted. This makes no sense as there is no reason to have a hold - unlike a hotel which might not know what you might be charging and "holds" an amount. This happens when you "pay at the pump" - your card is authorized before you make your purchase and the hold $30-50 in case you are a motor home, so if you only buy $10 worth of gas, your available credit is down til it clears. So if your bond purchase is denied, it might be that the previous purchases have a hold which doubles the amount using up your credit line. So it might look like there is no problem with your available credit, but there might be. I was told what was being held when I called from the store.

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DtG