The Eiduk Tax & Wealth Blog

Practical tax and wealth strategy for business owners, high earners, and rental owners — from a CPA and CFP®.

• The September 15 Estimated Payment: Your Safe Harbor Checkpoint for a Calm December

  The Q3 estimated payment due September 15 is your safe harbor checkpoint. Here is how to use it to plan year-end instead of scrambling to fix it.

  2026-08-10

• What a Personal CFO Actually Does (And Why Founders Need One)

  You have a CPA, an advisor, and a bookkeeper. But who connects them? Here's what a Personal CFO does and why the gaps between them cost you money.

  2026-07-29

• Stacking a Solo 401(k) and a Cash Balance Plan: How High-Profit Owners Shelter Six Figures Pre-Tax

  How profitable business owners pair a Solo 401(k) with a cash balance plan to defer well past $200,000 a year, plus the setup deadlines that make it possible.

  2026-07-21

• What Is the Eiduk System Blueprint?

  Most people have a tax preparer, maybe an advisor, and an estate attorney they saw once, and none of them talk to each other. The Blueprint is one coordinated plan across all three. Here is what it is, what you get, and who it is for.

  2026-07-21

• Is That Write-Off Actually Worth It?

  A deduction saves you your tax rate on a dollar — not the whole dollar. Here's the simple test for whether a 'tax-savings' purchase actually beats just paying the tax and investing the difference.

  2026-07-20

• Rental Property or Index Fund? Run the Real Numbers First

  Real estate looks like the obvious wealth play until you account for the down payment's opportunity cost, the vacancies, and the hours. Here is how to compare a rental honestly against a market portfolio, plus a free tool that does the after-tax math for you.

  2026-07-18

• Deduction vs. Invest: The Real Math on a Year-End Purchase

  A year-end deduction feels like free money. Run it against simply paying the tax and investing the difference, and the truth is usually less flattering. Here is the actual math on a $60,000 purchase, and a free tool that does it for you.

  2026-07-16