Sorry guys for not replying earlier - I did my own investigation on the topic and, taken that I'm not American it took some time to dive into details of your guys legal system and stuff.
Thank you all for your valuable input and I will highly appreciate if you kindly find time to read & comment my replies/questions below.
You report it and the government will perform their investigation(s) as they see fit. The rest of your questions are moot.
Zigner, to substantiate my report and make the overall "case" look solid to both SSA and IRS I need to provide them with supporting documents, which they find persuasive. The aim of my questions is to build a strategy.
How do you know so much about this "American citizen's" financials?
Let's say - close enemy. Like close friend but the other way round.
--- DOCUMENTS & FACTS - SUMMARIZED ---
I plan to build my report on the
1) documents I will provide IRS & SSA with;
2) facts/evidence I will state in my report (I won't be able to support them with documents, but IRS/SSA will definitely get necessary proof through official fact checking/requests/procedures).
These are the documents I have so far:
- doc1 The statement of ownership (from _date1_ to _date2_) of the 1st foreign real estate (sold), where the end date confirms that the change of the ownership took place (i.e. the former owner has sold it or granted, donated, etc.)
- doc2 The statement of the "estimated by the state" price of the real estate (for the date of its sale). This is the price based on which the state charges the property tax. It is more or less equal to the real market price at which the property may be sold.
- doc3 The statement of ownership of the 2nd foreign real estate, which this person still owns
- doc4 The statement of the "estimated by the state" price (latest possible) of the 2nd real estate
These are the
additional facts I know, but they need to be officially "checked" by IRS & SSA (when/if these facts confirm violation to any of those bodies, of course):
- fact1 The person deluded SSA officer in that he did NOT leave the U.S. for more than 30 days in a row, and intentionally failed (several times!) to submit such a report (way(s) to check: see dates on border stamps in passport; request report from US border control authorities)
- fact2 The person concealed the fact he had foreign bank account with more than $2,000 in assets (way(s) to check: ask violator to provide paperback official bank statement for the time period needed; request confirmation from the foreign bank directly)
- fact3 The person concealed the fact he receives a "retirement pension for work not covered by U.S. Social Security", as he receives pension from the foreign state on a monthly basis (way(s) to check: ask violator to provide statement from the foreign state body on the amount of pension they have)
- fact4 The person willfully failed to report "foreign financial account(s) exceeding $10,000 in total in a calendar year", i.e. failed to file the FBAR - Foreign Bank and Financial Account Report (way(s) to check: ask violator to provide original copy of the real estate sale contract, which states the Buyer deposits $X to the bank deposit box in the name of the Seller; request confirmation from the foreign bank directly)
- fact5 The person has brought to the U.S. the money from sale of their foreign real estate (way(s) to check: NO way???)
- fact6 The person keeps the money from the foreign real estate sale in a U.S. bank deposit box (way(s) to check: report to IRS (FinCEN?) and let it do the rest)
--- "COMPOSITION" OF FUTURE REPORTS ---
IRS
Reported: failing to report/pay income tax
Supported with: doc1,
doc2;
fact3 (U.S. taxpayers
must report foreign pension assets to IRS),
fact4,
fact6
Reported: failing to report foreign financial account(s) exceeding $10,000
Supported with: fact4
SSA
Reported: intentionally pretending to "have limited income and few assets"
Supported with: doc1,
doc2,
doc3,
doc4;
possibly (???) fact2 (high chances he had more than $2k on foreign accounts even
before the real estate was sold),
fact3
Reported: concealing multiple facts of leaving the U.S. for more than 30 days in a row and failing to submit reports on these facts
Supported with: fact1
Reported: willfully failing to report "changes in income and resources"
Supported with: doc1,
doc2;
fact2 (all the year 2020 long he 100%
does have more than $2k on foreign accounts),
fact4 (I mean SSA can ask violator to show the original copy of the real estate sale contract)
--- QUESTIONS LEFT ---
Assuming ... he intentionally misrepresented his assets to SSA to get SSA benefits (and there is evidence to prove it) he is potentially guilty of a federal felony for SSA fraud, which is a federal felony
1. Shall the documents/facts I've mentioned above look as a solid substantiation of the "intentional mispresentation of the assets" to SSA - in your opinion? Which document/evidence may hypothetically
strengthen this part of my fraud report?
Income tax evasion, which requires evidence of intent to actually commit the crime of evasion and not merely misrepresentation on the return, is also a federal felony offense
2. Same question - shall the documents/facts I've mentioned above look as a solid substantiation of the "intent to commit the crime" to IRS - in your opinion? Which document/evidence may hypothetically
strengthen this part of my fraud report?
Bear in mind for both the SSA improper benefits and tax underreporting there are civil penalties
3. Do you mean that if SSA or IRS do
not find the documents/facts from my report enough to treat mispresentation or underreporting as
intentional (and thus - take this case as a federal felony), there
is enough of the evidence to at least apply
civil penalties?
If the taxpayer is a resident of a state that has an income tax or DC (which has a pretty high income tax) the person may be guilty of state/DC tax offenses too.
4. Shall I send the copy of my IRS report to some D.C. authorities too, or is it rather an internal process which IRS handles themselves?
And as Medicare is a joint federal/state program, there could be state/DC criminal prosecution for the state/DC offenses in addition to any federal prosecution
5. Medicare is an SSA program (= based on earnings) benefit, while I'm going to report Supplemental Security Income (SSI) (= based on need) fraud. Or can the logic you've described be as well applied to
Medicaid (part of SSI benefits)?
there is prosecution for the customs offense in failing to report the cash brought into the US, which is a federal felony
6. Does the above-mentioned
relate to this particular case? As I've said the person has always brought sums less than $10 000 and did it during
several trips. As far as I know sums under $10k are not to be declared when entering the U.S., or is it rather smth.
else (that I'm not aware of) that is a felony here?
Note that if the person had a foreign bank account into which the sale proceeds were deposited, he was required by federal law to report that account to the IRS and/or FinCEN depending on the details of the bank account.
7. He surely
had such an account and I mentioned it in my
fact4 part above. How do I know if it's IRS or rather FinCEN that I should contact on this matter - which "details of the bank account" should I consider?
8. Am I right this person did NOT have to file
FATCA (8938 Form) to IRS if his assets (money from sale of the 1st real estate) were
below $50 000?
If he also structured deposits of the cash into his U.S. bank account in an effort to avoid reporting, that too is a crime and can result in civil penalties, too.
9. He did (mentioned it in my
fact6 part above), but I don't know the name of the bank, so I can only state the
fact itself to IRS.
Failing to report a federal federal felony crime and helping to conceal it is itself a federal crime, misprision of felony.
10. By the way, this person's daughter not only knows about
all the situation, but also has one set of keys from the deposit box with cash. I'm not aware if she's the Party in the deposit box contract with the bank (maybe she is, maybe she's not), but she definitely has the keys. Does this mean she's part of this crime too?
Also include information like the person's age, level of education, etc., as those factors influence the decision of whether to prosecute
11. Do you mean there really is correllation between their decision to prosecute and violator's age or level of education? I'm surprised... Though education is more or less understandable - having MBA or PhD makes it harder to believe you failed to understand what "more than $10k" meant.

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Thank you for your comments guys!