Chapter 2. Interest Income, excluding OID and OID Income ...
https://taxaid.com/publications/u-s-portfolio-investment/chapter-2-interest-income-excluding-oid-and-oid-income/
In general, obligations which mature within 183 days or less are not considered original issued discount (OID) obligations for purposes of the gross basis withholding tax. Code Sec. 871(g)(1)(B) or 881(a)(3). OID is equal to the excess, if any, of the stated redemption price at maturity over its issue price. Code Sec. 1273.
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