I am self employed (sole proprietor). Is the deductible amount for a traditional (or Roth) IRA affected by a SEP contribution (and vice versa)?

[dmertz · Accepted solution]

Only to the extent that your SEP contribution reduces your eligible compensation available to support a personal IRA contribution.  This would only be an issue if maximized your SEP contribution and your net profit from self employment was less than $7,398 (under age 50) or $8,743 (age 50 or over).

The SEP contribution does not count toward the $5,500 ($6,500 with catch-up) limit for personal IRA contributions.