"For eligible plans, US expatriates may be subject to a 30% US tax rate on all taxable payments, which is to be deducted and withheld by the payor. In special cases, individuals may be exempt from this tax under certain tax treaties.
For example, US expatriates who are Australian citizens may be exempt from the US tax if they begin taking withdrawals at age 65 or older and those withdrawals qualify as pension payments. However, the individual must waive the right to reduce withholding rates by treaty if they wish to receive “pay as you go” treatment for eligible deferred compensation items."
The smart way is to "Invest" overseas before exiting.
Then sell those assets when needed.
US don't monitor investments if they don't bring yearly income.