Tax Day may be behind us, but tax planning never stops — especially if your income isn't perfectly predictable.
Whether you receive a year-end bonus, earn seasonal business income, or have a significant investment event on the horizon, the IRS expects you to pay taxes throughout the year. Miss that target, and you could face underpayment penalties — even if you write a check for the full amount in April.
The good news? The tax code gives you several tools to avoid those penalties entirely. Here are five strategies worth knowing.
Here's something most people don't know: withholding is treated differently from estimated tax payments. If you realize in November that you've underpaid, ramping up withholding on your final paycheck — or taking an IRA distribution with 100% federal withholding — can retroactively cover earlier quarters. The IRS treats all withholding as if it were paid evenly throughout the year, which means it can eliminate penalties that would otherwise be locked in.
This is the most straightforward strategy for high-income earners. If your adjusted gross income exceeds $150,000, paying 110% of last year's total tax liability — spread across four equal quarterly payments — makes you bulletproof against penalties, regardless of what you earn this year. Even if you have a massive windfall, you will not owe a penalty as long as you hit that threshold.
If your income is seasonal — for example, you're a business owner, consultant, or executive who receives large payments late in the year — paying equal estimated amounts in April and June can feel unfair and create a cash flow crunch. The annualized income method allows you to base each quarterly payment on what you've actually earned to date, rather than projecting a full year. It requires more calculation, but it keeps your capital working for you longer.
Sometimes the most mathematically sound decision is simply to underpay intentionally. The IRS underpayment penalty is not a criminal fine — it's an interest charge, currently hovering around 7% as of early 2026. If you have capital deployed at a higher return, or if preserving liquidity is a priority, factoring the penalty into your financial plan as a cost of capital may make sense for your situation.
5. The Hybrid Approach
Many disciplined investors combine strategies: they set quarterly payments to exactly meet the 110% safe harbor (guaranteeing no penalties), then hold the remaining tax balance in a high-yield account or short-term Treasury until April 15. The result? No penalties, equal predictable payments, and additional interest earned on what you'll eventually owe.
If you'd like to discuss how tax planning fits into your overall financial strategy, I invite you to schedule a complimentary conversation.