Contribution Limits. Standard Roth IRAs have a contribution maximum of $5,000 per tax year per person. Individuals who earn less than $5,000 per tax year, however, can only contribute up to the amount of income they earned for the tax year.The maximum contribution amount is raised to $6,000 if the taxpayer is 50 years of age or older.ontribution Limits. Standard Roth IRAs have a contribution maximum of $5,000 per tax year per person. Individuals who earn less than $5,000 per tax year, however, can only contribute up to the amount of income they earned for the tax year.