So there's three answers to this question, and they're the same ones I give when I've been DMed about this (again, reminder I'm layman, not a lawyer/accountant). Here's the AFIP/BCRA answer:
Steve asked: what happens if you get caught?
- Businesses, including monotributistas must use the MULC, si o si, when exporting goods or services abroad
- Monotributistas must issue facturas "E" (export receipts) to their clients abroad
- Monotributistas who earn more than $3,969,420 ARS/year (for 2022) at the official exchange rate must transition to the "general regime" but, like all things Argentina, AFIP only really seems to enforce this once you bill around 25% above this limit annually
All this being said, tens of thousands of people still work remotely for salaries in dollars and don't use the MULC without being caught (which, again, is illegal) but that's because, from my Googling and reading they: A) pay taxes as a Monotributista, B) Spend the same or less via credit, debit, or transferia that they declare in income to AFIP, and C) They don't use digital peer to peer crypto exchanges (as this creates a paper trail), but rather they use a digital cave which, like a cave on Florida Street, asks for no ID/CUIL/etc and their dollars always stay outside of Argentina and they receive their pesos in cash.
- Tens of thousands of Argentines are doing this every month, most in Programming, IT, and translation services
- I have read 1st hand accounts in Spanish of 3 people who were caught
- It wasn't AFIP that caught them for violating the MULC
- They were caught by their bank/Uala/MercadoPago's KYC regulations for receiving digital transfers from peer-to-peer crypto resale
- Person 1 was allegedly referred to the UFI/put on a banking blacklist because he did this receptively until he was locked out of all the banks and digital wallets (CVUs)
- Person 2 got a KYC request from MercadoPago who froze their account. Last I heard they were kissing the money goodbye instead of risking a UFI blacklisting
- Person 3 got KYC request from their bank, wasn't even registered as a monotributista, paying no taxes at all, and asked if it was possible to register as one and then claim the funds were from work he was preforming; the consensus was no, as he needed to be registered previously/where is the factura to justify the payment via peer-to-peer crypto resale? He was contemplating saying goodbye to the money and learning a valuable lesson.
I don't condemn nor condone this behavior (unless someone isn't paying any taxes, then I condemn it), but just like selling dollars on Florida Street is illegal, so is trading dollars outside of the MULC. I don't know of anyone who has been punished for either, but in theory it can happen, so keep that in mind...
As far as I know operations using the Contado Con Liqui are valid under the MULC (buying argentine bonds or some of the 19 argentine shares https://es.investing.com/equities/argentina-adrs quoted in NY in USD and in Argentina in pesos and selling for pesos which can be done through a broker such as bullmarketbrokers. No idea what the fees are like. Interesting, Uala have a new brokerage service Ualintec Capital coming out.
Other option to buy shares through CEDARs such as MELI (Mercado libre) quoted in USD in NY but not quoted in argentina in pesos. https://es.wikipedia.org/wiki/Certificado_de_Depósito_Argentino . There are 102 shares listed here. Not sure if this can facilitate transferring USD outside to argentina to Argentina and complying with the MULC.