Say someone's income for the last two years was reported as $5,000 and should have been reported as $70,000. Where could they go to find out how much greater their future Social Security benefit would be if their tax returns were amended? Their accountant doesn't know and Social Security has outrageous hold times for the help line. It's a hard one to google because most hits are about the impact of working when you're already drawing SS. Is there a calculator online? Please focus only the question of calculating the difference in future benefit if their earnings record were corrected, and ignore all other legal questions. Thank you!