Why? This year's abbreviation is easily changeable and could be used against you. The concern is that scammers could easily manipulate a document dated "1/1/20" into "1/1/2000" or even "1/1/2021."
Writing out the full date "could possibly protect you and prevent legal issues on paperwork," according to Hamilton County, Ohio, Auditor Dusty Rhodes.
Ira Rheingold, the executive director of the National Association of Consumer Advocates, says it's early in the year to cite examples, but scammers could use the method to establish an unpaid debt or to attempt to cash an old check.
"Say you agreed to make payments beginning on 1/15/20. The bad guy could theoretically establish that you began owing your obligation on 1/15/2019, and try to collect additional $$$," Rheingold wrote.
In the future, post-dating could be a problem too. For example, a check dated "1/1/20" could become "1/1/2021" next year, possibly making the uncashed check active again, Rheingold wrote. A similar method could be used for debts that are past the statute of limits.
The solution is easy: There's no harm in writing the full date. Writing the month out can also help.
Write this: January 15, 2020. Not this: 1/15/20.