United States Investments Calculators

Free, localized investments planning tools updated for the 2026 financial year in United States.

Family loans live or die on one number: the IRS Applicable Federal Rate. Charge a relative less than the AFR for the month the loan is made and the difference becomes imputed interest, taxable to you and creeping into gift territory. The August 2026 calculator applies the actual published rates from Rev. Rul. 2026-13, short-term 4.10%, mid-term 4.35%, long-term 4.92%, against your loan's size, term, and rate, and flags the $10,000 de minimis and $100,000 investment-income exceptions that keep small family loans out of trouble.

Available calculators

Government-Sourced DataAll calculators built from official regulatory sources by Galvin Mendonca, Finance Researcher
All figures from primary government sources. Last updated July 2026.

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