Taxes & RegulationIntermediate

What is a crypto mixer and is it legal?

A cryptocurrency mixer pools and shuffles coins to hide the sender. Using one is not automatically illegal; OFAC's list decides which mixers are barred.

Vahe HakobyanEditor-in-chief Updated Oct 6, 20263 min readFact-checked

Illustration: World-Crypt

On this page

When are mixers illegal?Which rules apply to operators?How does mixing affect taxes?What is a crypto mixer?FAQ

Key takeaways

OFAC's sanctions list changes, so check it before using a service.
Mixing does not erase taxable gains on later sales or swaps.
Sanctions cover dealings with named mixers, not every transaction.

Short answer

A cryptocurrency mixer pools and shuffles crypto from many users, then sends withdrawals from a shared pool to obscure the on-chain link between sender and receiver. Using one is not automatically illegal in the US, but OFAC's sanctions list decides which mixers US persons cannot use, and criminal use is illegal.

OFAC runs the sanctions list for the US Treasury, and the list changes. FinCEN applies money transmitter and anti-money laundering rules to many mixer operators under the Bank Secrecy Act.

When are mixers illegal?

Using a mixer is not automatically illegal, but OFAC's sanctions list decides which mixers US persons cannot use. Sanctions cover US persons dealing with sanctioned mixers, not every mixer transaction. Criminal use of a mixer is illegal.

Sanctioned mixers and unlisted mixers
Criterion	Sanctioned mixer	Unlisted mixer
Who may use it	US persons cannot deal with it	Using it is not automatically illegal
What the rule covers	The ban targets dealings with the named mixer	The ban does not cover every mixer transaction
What to check	OFAC's sanctions list	The operator's FinCEN registration status

Which rules apply to operators?

FinCEN applies money transmitter rules to many mixer operators under the Bank Secrecy Act. The rules target the operator, not the customer.

Register with FinCEN as a money services business.
Run an anti-money laundering program.
File suspicious activity reports.
Keep Bank Secrecy Act records.

How does mixing affect taxes?

The IRS treats cryptocurrency as property, so mixing does not erase a taxable gain. When you later sell, swap, or spend the mixed cryptocurrency, you may owe tax on any gain. Buying crypto with US dollars is not taxable, but trading one crypto for another, including a stablecoin, or paying with crypto is.

What is a crypto mixer?

A mixer pools and shuffles crypto from many users. It sends withdrawals from a shared pool to obscure the on-chain link between sender and receiver.

Mixers usually charge a fee, and some keep records of deposits and withdrawals.

Frequently asked questions

No. A privacy coin is a cryptocurrency that hides transaction details on its own blockchain, unlike a mixer, which is a separate service for other cryptocurrencies.

Sometimes. Chain analysis firms look for patterns in timing and amounts, and investigators have followed funds through mixers.

OFAC enforces sanctions on a strict liability basis, so a mistake does not excuse a prohibited deal. A lawyer can help you check the list and assess your exposure.

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Written byVahe HakobyanVahe Hakobyan is the editor-in-chief of World-Crypt. He covers bitcoin, markets and regulation, and leads the newsroom that fact-checks every story before it goes live.