The results of the
2019 Research on non-resident Americans and U.S. taxation is now available. It's the most thorough collection of data for US expats to date and for those interested, is most enlightening.
The summary page is located:
https://www.democratsabroad.org/carmelan/tax_filing_from_abroad_2019_research_on_non-resident_americans_and_u_s_taxationFor the full, detailed report, click on the download link in the second paragraph.
"they [US expats]
are ordinary, middle class Americans - 71% employed, 61% with household income of less than $100k, 72% married (71% to non-U.S. spouses), 63% own their own home. As 32% left the U.S. for marriage or a relationship, 25% left the U.S. to pursue employment/work....."
There were roughly 10,000 respondents, which gives a reliable data set, but it appears the responses may be skewed by the lack of interest in the below 35 year old age group. This is understandable, and the report reflects the over 45 year old bias with the following statement -
"when discriminatory U.S. tax policy has its biggest impact it is reasonable to surmise that the Americans abroad who responded to this taxation research project are those 1) who are of stable, working age (able to save and invest) and 2) into their retirement years." IMO, the majority of those in the 18-34 age group will likely be those with the simplest returns (2555) with smaller savings/investments, and appears to reflect a cross-section of UK Yankee members.
From a very cursory scan of the report:
As compared to US population distribution, those responding to the survey in the 45+ age group represent an above average distribution for their age (70%). As compared to US population distribution, those responding to the survey in the 18-34 age group represent a below average distribution for their age (13.5%).
72% of respondents have a household income above $50,000. 51% of respondents are in the $50,000 to $150,000 household income range. 28% have a household income of less than $50,000. These figures very much reflect normal household income distributions for those in the US.
21% of respondents plan to return to the US permanently at sometime in the future. 15% are unsure of future plans. 64% do not plan on returning to the US permanently, ever.
Of the respondents, 75% are compliant with US tax reporting. This is the most obvious indicator that the respondents may not accurately reflect the entire US diaspora, especially when one reads of the IRS claims of a 'tax gap'.
28% of the respondents filed form 8938 (FATCA).
56.5% of the respondents, an increasing number, utilised the services of a tax professional to file their US returns. The IRS claims 92% of US domiciled
"taxpayers self-prepared and efiled their own 2017 returns in 2018". Even with TurboTax, et. al., given the number of shop front/ strip mall tax preparers in the US, the IRS statement would appear questionable.
61% of those living abroad and using a professional paid $500+ for the service. Only 10% paid less than $200.
The research uses the figure for the population of US citizens abroad (diaspora) of 6.5 million, a much more believable number than the 9 million figure often thrown about when one looks at the number of expats resident in countries with the highest numbers of US expats: Canada - 1 million; Mexico - 1 million; UK - 200,000; France and Germany - 125,000; and all others much below those figures. The responses to the survey reflect those distributions with the exception of Mexico (fewer respondents).
EDIT to ADD: There are many quotes from US expats abroad in the report, and a good number are from expats in the UK.