Taxes: The Cost Basis Workaround

(Sorry, I gave this post a title that might seem like I’ve got a trick to share, but I don’t)

Q: What stops people from claiming the highest possible cost basis for their taxes, and then simply re-using that original entry into a coin for multiple, future tax filings?

Say for example I buy a coin at a high price, and then continue to DCA into that coin as the price drops. When the market rises again, can we not just claim, over and over, that the withdrawals to fiat stem from the original, more expensive purchase? This lowers the amount of gains that are being taxed. There’s no practical way to see which coins are being sold when you withdraw.

(I’m sure it’s painfully obvious I’m not used to taking profits)