Quarterly Estimated Taxes 101 (How to Stop Overpaying or Underpaying)

Estimated taxes should not feel like a guessing game, but for many business owners, they do. Underpay, and you face stress, penalties, and a big bill in April. Overpay, and you hand the IRS more cash than needed, limiting what you can reinvest in your business.

In this episode, we break down how estimated taxes actually work, why the U.S. tax system is pay-as-you-earn, and how to avoid both overpaying and underpaying. We cover the safe harbor rules, why accurate bookkeeping matters, and how to build a smarter system for quarterly payments that improves cash flow and reduces surprises.

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Chapters

(02:15) Why Business Owners Fall Behind on Quarterly Taxes
Without an employer withholding taxes, business owners are responsible for making estimated payments themselves, and many ignore them until penalties and interest build up.

(03:45) Why Last Year’s Income Is Not Enough
Many business owners base estimated taxes on last year’s income or send in whatever feels safe, but income, deductions, entity structure, and tax law can all change.

(04:30) The Safe Harbor Rules You Need to Know
To generally avoid underpayment penalties, you need to pay 100% of last year’s tax liability, 110% for certain higher-income earners, or 90% of this year’s tax liability.

(06:30) The Cash Flow Cost of Overpaying and Underpaying
Overpaying estimated taxes can tie up money that could be used for marketing, debt reduction, equipment, or other business needs, only to result in a refund later, while underpaying creates pressure when tax time comes, especially if business profits rise and estimated payments were never adjusted upward during the year.

(08:40) How to Calculate Estimated Taxes More Strategically
The process starts with a quarterly profit analysis, then projecting the rest of the year forward, and finally adjusting payments intentionally based on current numbers.

(10:40) Estimated Tax Due Dates Every Business Owner Should Know
Quarterly estimated tax payments follow a set schedule throughout the year, and knowing those due dates is essential for staying compliant and avoiding surprises.

Podcast Host:

Mike Jesowshek, CPA – Founder and Host of Small Business Tax Savings Podcast
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🎙 ABOUT THE PODCAST
The Small Business Tax Savings Podcast is your go-to resource for cutting-edge tax strategies to help entrepreneurs legally slash their tax bills. Hosted by Mike Jesowshek, CPA, this show breaks down complex tax topics into clear, no-fluff insights so you can keep more of your hard-earned money.