Answer: $0
Explanation:
In the United States tax law, there exists 2 principal types of IRAs. They include: the traditional IRA and the Roth IRA.
Annual contributions are deductible when made to a traditional IRA, and in which case tax is paid on the retirement distributions.
But annual contributions made to a Roth IRA aren't deductible, and in which case taxes are not paid on retirement distributions.
Martha’s maximum deductible IRA contribution is $0 because taxes are not paid in the current year on earnings in both types of IRAs.