How much cash can you carry on a flight?

Guide · Money & Valuables

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The short answer: unlimited on domestic US and Canadian flights. On international flights you may still carry any amount — but $10,000 or more (or the foreign equivalent) must be declared to customs. It is a reporting rule, not a limit and not a tax.

The $10,000 declaration rule

Both the US and Canada require a report when you physically transport $10,000 or more in currency or monetary instruments (checks, money orders, bearer instruments) across the border — in either direction, arriving or departing. The trigger is the amount crossing the border with you, not what you own. Multiple currencies are added together at the current exchange rate.

United States: file FinCEN Form 105 with CBP on departure or arrival carrying ≥ $10,000.
Canada: report ≥ CA$10,000 to a CBSA officer (or at a kiosk where available) — also in both directions.
It is not a tax. Declaring legally owned money costs nothing. The report exists so governments can track money laundering, not to charge you.
Not declaring is the crime. Undeclared cash over the threshold can be seized in full, and the failure itself can be prosecuted even when the money is entirely legitimate.

How to declare properly

Tell the officer before you are asked. In the US, complete FinCEN 105 (available at the border or downloadable in advance) or declare verbally to the CBP officer and follow their process. In Canada, use the declaration card or kiosk question and speak to a CBSA officer. Expect basic questions — how much, in what currencies, where it came from, what it is for. Answer plainly and have proof (withdrawal receipts, sale documents, inheritance papers) within reach. A clean declaration typically adds minutes to your border crossing and creates a paper trail that protects you.

Practical rules for flying with large sums

Never put cash in checked luggage. It is the highest-theft point of the trip and airline liability for cash in checked bags is essentially zero. Cash lives in your carry-on or on your person — same as watches and gold jewelry.
Split it across two places — on you and in your carry-on — so a single loss is not total.
Carry source documentation. Bank withdrawal slips or a sale receipt turn a nervous checkpoint conversation into a short one.
On the X-ray belt, keep eyes on it. Ask for a private screening room if a very large amount will be counted in the open.
Check the destination too. Many countries have their own declaration thresholds (the EU uses €10,000, India requires a currency declaration above set amounts). The departure-country rule is only half the journey.
Gifted or pooled money counts. If you are carrying it across the border, it is yours to declare — the group threshold applies to everyone traveling together.

Bottom line: big sums are legal to fly with. The line that matters is not how much you carry — it is whether you declared it when crossing a border at $10,000 or more.

Go deeper

Sources: CBP — Currency & Monetary Instruments · FinCEN Form 105 · CBSA — Reporting currency. Last verified 2026-07-30.

Cash on a flight — FAQs

How much cash can I carry on a domestic flight in the US?

There is no legal limit. You can fly domestically in the US or Canada with any amount of cash. Very large sums may draw questions from TSA or airport police about the source — carrying documentation (bank withdrawal slips, sale receipts) makes this a short conversation.

What happens if I carry more than $10,000 internationally?

Nothing illegal — as long as you declare it. $10,000 is a reporting threshold, not a limit. Failing to declare is the crime: undeclared cash over the threshold can be seized in full by CBP (US) or CBSA (Canada), and getting it back is a long legal process.

Does the $10,000 rule apply per person or per family?

Per group traveling together. A couple carrying $15,000 combined exceeds the threshold and must declare. Structuring money between people specifically to stay under $10,000 is itself a felony (structuring/smurfing).

Do I pay tax on declared cash?

No. The FinCEN 105 (US) and CBSA declaration (Canada) are anti-money-laundering reports, not tax forms. Declaring money that is legally yours costs nothing and triggers no duty.

Does a cashier's check or gold count toward the $10,000?

Monetary instruments — cash, traveler's checks, money orders, and bearer negotiable instruments — all count toward the threshold. Gold bullion is a commodity, not a monetary instrument, but it may separately trigger customs valuation rules at your destination. See the gold & jewelry rules for details.

Can TSA confiscate my cash?

TSA itself does not seize cash — its job is threats to aviation, not money. But screeners can refer large sums to law enforcement for civil asset forfeiture review. Flying with large amounts is legal; documenting the source is what protects you.