Sending Money From Korea to the US

On the China route the hard question is whether the money can be paid out at all. On the US route it almost always can: an ordinary checking or savings account has no personal foreign-exchange quota, and receiving is not the constrained step.

So the failures here sit somewhere else entirely. They are confusing a wire with an ACH credit, entering the wrong routing number, or misjudging what the money legally is once it has arrived. The last one is the expensive mistake, and it happens after the transfer has apparently succeeded.

The destination-neutral mechanics — the spread, how a SWIFT wire loses money at each bank it crosses, comparing on the amount received — are in sending money from Korea, and what Korea lets you send is in managing money in Korea.

Two arrival routes into the same account

A bank wire leaves Korea over SWIFT, reaches a US correspondent bank, and settles through Fedwire or CHIPS. Fedwire is the Federal Reserve’s real-time gross settlement system, so that leg is immediate and final. The transfer as a whole is not: add the sending bank’s cut-off, the SWIFT hop, the correspondent’s review and the receiving bank’s posting, and US banks generally quote one to two business days for an incoming international wire.

ACH is a different animal — a domestic US network that settles in batches, operated by FedACH and EPN. When a Korean fintech takes your won, sources dollars with a US partner and has that partner send an ACH credit, the last leg of your international transfer is a domestic US payment.

Which kills a rule of thumb worth unlearning: “wire takes a day, ACH takes three” is not how this works. Much of ACH now settles within a business day and Same Day ACH exists. What determines the time you actually experience is the remitter’s KYC and AML review plus its US partner’s cut-off — one to three business days end to end, depending mostly on the review and not on the network.

The practical consequence is that some services only ever use one of the two. At least one Korean remitter accepts only an ACH routing number for US payouts, and another instructs you specifically to enter the electronic payment routing number. If the form asks for one kind, the other kind is not a substitute.

Nine digits is not one number

A US routing transit number — the ABA number — is nine digits, but a bank does not necessarily use the same nine digits on every network. Wells Fargo publishes that its direct-deposit routing number and its wire routing number can differ, and Bank of America likewise provides a separate one for wires.

So:

• The form says ACH, or direct deposit, or electronic → find the direct deposit / electronic / ACH routing number in online banking. Do not substitute the wire routing number.
• You are sending an international wire → use the receiving bank’s own incoming international wire instructions: the SWIFT/BIC code, and the wire ABA where one is required.

Two more that cause returns:

Checking or savings has to match the actual account. It is a routing instruction, not a preference.

The account number is the bank account number — never the sixteen digits on a debit card.

And do not assume the ABA printed at the bottom of a cheque is your international wire instruction. For several large US banks it is not.

What the money is decides the tax, not how it travelled

US tax residence is wider than citizenship: permanent residents, and non-citizens who meet the Green Card test or the Substantial Presence test, are US tax residents too. That is the status the rest of this section turns on.

Your own money, your own account

A self-transfer is not a gift, and the amount transferred is not new income. What deserves a look is the Korean account it left.

FBAR — FinCEN Form 114 — is reportable in principle where the combined highest balance of your foreign financial accounts exceeded USD 10,000 at any point in the year. Note what that does not say: emptying the account before December does not end the obligation, because the test is the highest balance during the year, not the balance at the end of it.

Form 8938 under FATCA is a separate regime with its own thresholds — for a single person living in the US, specified foreign financial assets over USD 50,000 at year end or over USD 75,000 at any point during it, with different figures for joint filers and for those living abroad. Filing one of these two does not excuse the other. They overlap; they do not substitute.

A gift from family in Korea

Where a US person receives a gift or bequest from a non-resident alien individual — parents in Korea, in the ordinary case — and the year’s total exceeds USD 100,000, it is reported on Form 3520. Gifts from related donors can be aggregated toward that figure, so splitting a transfer between two parents does not necessarily split the test.

Two distinctions worth holding onto, because they are usually collapsed:

Form 3520 is an information return, not a tax bill. A gift or bequest is generally not income to the recipient. Reporting it is not paying on it.

The USD 100,000 is an annual total, not a per-transfer threshold. It is the sum received from related foreign donors in the tax year.

What is expensive is not filing. Where a reportable foreign gift is omitted, the penalty runs at 5% of the unreported amount per month, to a maximum of 25%. Covered expatriates and foreign trusts sit under separate rules again.

Intermediary fees, and what actually lands

The least predictable line on a SWIFT wire is the correspondent and intermediary bank charge. There is no fixed USD 15 or USD 30 deducted from every transfer — it depends on how many banks the payment crosses, the sending bank’s terms, and the receiving account product.

On standard personal accounts at large US banks an incoming wire fee of around USD 15 is common, with some premium accounts waiving it, and Bank of America states plainly that other institutions’ charges can be added along the way.

A local ACH payout works differently: no SWIFT correspondent stands between the US partner and the recipient’s account, so the traditional intermediary deduction has nowhere to occur. That is a structural difference, not a discount someone is offering you.

The figures below are a worked structure, not a live quote. They assume USD 1 = ₩1,400, a ₩5,000 fintech fee, ₩18,000 in Korean bank charges on a wire, and USD 15 + USD 15 taken by an intermediary and the receiving bank on the wire route.

Route	Sent	Korean cost	US-side cost	Received
Fintech ACH	₩1,000,000	₩5,000	$0	$714.29
Bank wire	₩1,000,000	₩18,000	$30	$684.29
Fintech ACH	₩5,000,000	₩5,000	$0	$3,571.43
Bank wire	₩5,000,000	₩18,000	$30	$3,541.43

Compare the same way for real: the total won leaving your Korean account against the amount finally posted to the US account. The advertised fee is the smallest part of the gap.

Each route has a job. A wire is for urgency, for large sums, and for a transfer you may need traced between banks. A local ACH payout suits small, repeated transfers — living costs, tuition — where the intermediary deduction is the thing worth removing.

And arriving is not the end of it. If it was your own money, check whether the Korean account puts you inside FBAR or Form 8938. If it was a gift from family who are not US persons, check the year’s total against USD 100,000 and whether Form 3520 is due. Wire or ACH decides how the money travels. Where it came from, and what it legally is, decides the US tax outcome.