The fine was revoked after a public outcry erupted over disproportionate punishment.
An individual or a shop illegally exchanging up to $1,000 will receive a warning instead of a fine of up to VND100 million ($4,300), according to a new government decree set to take effect December 31.
The fine will increase progressively, with a maximum penalty of VND100 million levied for illegally exchanging more than $100,000, the decree says.
Illegal exports and imports of currency will be fined up to VND250 million ($10,800).
The legal amendments come after a resident of the southern city of Can Tho was fined VND90 million ($3,900) in October 2018 for exchanging a $100 note at a gold shop.
It is a common practice for Vietnamese citizens to exchange currencies at local gold shops that offer better prices than banks, even though very few of the shops are licensed exchangers.
Can Tho authorities revoked the punishment after Deputy Prime Minister Truong Hoa Binh said such a heavy fine should be reviewed, and lawyers and lawmakers also said it was unreasonable.
However, the province confiscated the $100 note from the man, an electrician who makes VND4 million ($171) a month.