Depending on how the two accounts are linked - yes I believe you still need to report the transfer, however, since it isn't leaving your person (unless it's being transferred between separate representations like a business you wholly own and a personal account) then it isn't subject to taxation.

This reporting primarily exists to make money laundering less efficient by forcing parties that want to keep things out of view of law enforcement to make many relatively small money movements - and 10k is high enough that it doesn't affect normal folks all that often.

Honestly, when it comes to anything involving a bank these transfers are usually automatically reported by the institution.

> Depending on how the two accounts are linked - yes I believe you still need to report the transfer

Pedantic note here - "You" don't have to do anything here, your bank will do the reporting.

That is precisely correct and I think it's a good mention. I made it more clear in other comments after people brought up the burden of having to filling out tax forms constantly. You won't often execute transactions that actually qualify you for this level of reporting and in almost all circumstances the financial institution backing the transaction will actually do the reporting (bank or credit card company). If the payment is cash (which is beyond rare for transactions of this scale) it'll still usually only be required for the vendor to report the transaction.

It’s not a tax implication it’s a money laundering one. Your financial firm will fill out a currency transaction report if you transfer 10k or more between accounts. They will also do it if they believe you are structuring transfers to avoid the 10k number. They also may file a suspicious activity report (sar) if they deem your transactions may constitute money laundering or they may deny transactions that would require them to do so.