SEP IRA vs Solo 401(k): Which Should You Choose?

By Laura Dohanes, CPA - February 3, 2021 

How do you multiply your net worth?

Let the government help.

Here’s how: with both the SEP IRA and the solo 401(k) retirement plans, your investment in your tax-favored retirement

  • creates tax deductions for the money you invest in the plan,
  • grows tax-deferred inside the plan, and
  • suffers taxes only when you take the money from the plan.

Example. You invest $1,000 a month in your retirement. You are in the 40 percent tax bracket (combined federal and state), and you earn 10 percent on your investments. At the end of 30 years, you have $1.58 million in after-tax spendable cash, which comes from (in round numbers):

  • $1.2 million in after-tax cash from the retirement plan ($2 million gross less 40 percent in taxes—we’re taking the entire amount out of the plan in this example)
  • $380,000 in the side fund (created by investing the $400 of monthly tax savings—$1,000 deduction x 40 percent)

If you had no government help on the taxes and invested $1,000 a month in an investment that earned 10 percent (6 percent after taxes), you would have a little more than $950,000.

Winner. The retirement plan wins by $630,000—after taxes ($1.58 million vs. $950,000).

Okay, that’s the big picture. It tells you that tax-advantaged investing multiplies profits. So, do it.

If you would like to discuss your retirement options,

Laura Dohanes, CPA

Laura Dohanes, CPA

Founder, My CPA Pro, P.C.  ·  California CPA License #129889  ·  Verify

Laura has spent more than two decades in the small business world as a tax strategist and fractional CFO, helping owners across the United States pay less tax and build lasting wealth. Her practice spans advanced tax planning, entity structuring, accounting, and CFO-level financial strategy, and she has represented more than 3,000 clients in federal and state tax audits. She also teaches financial literacy to young people, on the conviction that understanding money early changes what someone believes is possible.

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