As the year draws to a close, it’s a good time to revisit one often-overlooked aspect of tax planning: estimated tax payments. For many taxpayers—especially business owners, self-employed individuals, and those with investment income—estimated taxes are a critical part of staying compliant and avoiding surprises at tax time.

What Are Estimated Taxes?

Estimated taxes are quarterly payments made to the IRS to cover income that isn’t subject to withholding. While most wage earners have federal taxes withheld from each paycheck, that system doesn’t work for everyone. Estimated taxes help ensure taxes are paid as income is earned throughout the year rather than all at once when a return is filed.

According to IRS rules, estimated taxes generally apply if you receive income from:

  • Self-employment or freelance work

  • Interest, dividends, or capital gains

  • Rental or pass-through business income

  • Other sources where little or no tax is withheld

Congress created this system to complement withholding and keep taxpayers current on their tax obligations 

Why Estimated Taxes Are Important

While there is no requirement to make estimated payments if sufficient tax is paid through withholding, penalties may apply if total payments are inadequate or late. To avoid underpayment penalties, individuals generally must pay, over the course of the year, the lesser of:

  • 90% of the current year’s tax, or

  • 100% of the prior year’s tax (110% for higher-income taxpayers) 

Estimated payments are typically due:

  • April 15

  • June 15

  • September 15

  • January 15 of the following year

Missing or underpaying these installments can result in penalties and interest—even if you pay your full balance by April.

Why Paying Before December 31 Can Be Advantageous

Making estimated tax payments before December 31 can offer several benefits, especially as part of year-end planning:

1. Penalty Reduction
Paying additional estimates before year-end can help close any shortfall and reduce or eliminate underpayment penalties.

2. Cash Flow Control
Spreading payments throughout the year—or catching up before December 31—can be far less stressful than facing a large balance due at tax filing time.

3. Strategic Year-End Planning
Year-end is when income, deductions, and credits come into clearer focus. Reviewing estimated payments alongside other planning strategies—such as income deferral or deduction timing—can help align tax payments more closely with actual results 

4. State and Local Considerations
For taxpayers who itemize deductions, timing state estimated payments may affect deductibility. While federal SALT rules apply, coordination with year-end planning is still important and highly individualized.

A Note on Pass-Through Entity (PTE) Estimated Taxes

Owners of pass-through businesses—such as partnerships and S corporations—may also encounter Pass-Through Entity (PTE) estimated tax payments at the state level.

Many states allow or require the business entity itself to pay state income tax on behalf of owners. These PTE taxes:

  • Are often paid through quarterly estimates

  • Can shift the tax deduction from the individual return to the business return

  • May help bypass federal SALT deduction limitations for qualifying taxpayers

Because PTE rules vary by state and entity type, proper planning and timely estimated payments are especially important.

Final Thoughts

Estimated taxes aren’t just a compliance obligation—they’re a planning opportunity. Reviewing your estimated tax position before December 31 can help minimize penalties, improve cash flow management, and align your overall tax strategy with your financial goals.

If your income has changed, you’ve started or sold a business, or you’re unsure whether your current payments are sufficient, now is the ideal time to review your situation with a tax professional.