Tax planning is not a once-a-year event. By the time you see your CPA in April, most of your options are gone. The return your accountant prepares in the spring is just a history of decisions you made — or didn't make — during the prior 12 months. The strategies that actually lower your tax bill happen before December 31, not after.
High-income earners and business owners who consistently pay less in taxes aren't more aggressive — they're more systematic. They have a calendar, they review it quarterly, and they make small adjustments throughout the year instead of scrambling in December. Here's what that calendar looks like.
The Cost of Reactive Tax Planning: A business owner who reviews their tax situation only in April typically misses estimated tax adjustments, year-end retirement contributions, strategic loss harvesting, and Roth conversion windows. Studies suggest proactive tax planning saves high-income earners an average of 5–15% of their annual tax bill — that can easily be $10,000–$40,000 on a moderate income. Work with a CPA who does quarterly reviews, not just filing season work.
Q1 — January through March: Set the Foundation
- Contribute to your IRA for the prior year — the deadline is April 15. Don't let this slip. A $7,000 traditional IRA contribution (2026 limit, $8,000 if 50+) at the 24% bracket saves $1,680 in federal taxes.
- Review withholding and estimated payments. If you underpaid last year, adjust your W-4 or first-quarter estimated payment (due April 15) to avoid penalties.
- Max your HSA if eligible. The 2026 HSA contribution limit is $4,300 for individual coverage, $8,550 for family coverage. Contributions are deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. It's the only triple-tax-advantaged account available.
- Review the prior year's return with your CPA. Identify missed opportunities — depreciation elections, retirement contribution limits, passive loss carryforwards — and correct course for the current year.
Q2 — April through June: Mid-Year Positioning
- Make your second estimated tax payment (due June 15 for the April-May period). Use Q1 actual income — not last year's — if your income varies.
- Project your full-year income. By May or June, you have a reasonable view of what this year will look like. Are you on track to hit a new bracket? Should you be accelerating deductions or deferring income?
- Review your retirement plan contributions. Are you on pace to max your 401(k)? The 2026 limit is $23,500, or $31,000 if 50+. Adjusting payroll deferrals mid-year is far easier than scrambling in December.
- Assess any planned asset sales. If you're considering selling real estate, a business interest, or a large stock position this year, now is the time to model the tax impact and identify offsetting strategies — not in November.
Q3 — July through September: Harvest and Adjust
- Tax-loss harvesting check. Review your taxable investment accounts for positions sitting at a loss. If you've had any realized gains this year — from sales, distributions, or business income — identify losses that can offset them before year-end.
- Third estimated tax payment due September 15. Reconcile against actual income through August.
- Retirement contribution catch-up review. For employees 50+, the catch-up contribution window is open. For self-employed individuals with SEP-IRAs or Solo 401(k)s, confirm you're on track to contribute the maximum before year-end or the filing deadline.
- Consider a Roth conversion analysis. If your income this year is lower than expected — due to business loss, transition, or life event — Q3 is the time to identify whether a partial Roth conversion makes sense before the year closes.
Q4 — October through December: Close the Loop
- Final estimated tax payment planning (due January 15). By November, your full-year income is largely clear. Finalize your estimate and make the fourth payment.
- Year-end charitable giving decisions. Fund your donor-advised fund, make QCDs if you're 70½ or older, or donate appreciated securities directly. All of this must be completed before December 31.
- Execute Roth conversions. Any Roth conversions must be completed by December 31. Calculate the optimal conversion amount with your CPA — fill the bracket without crossing into the next one.
- Final loss harvesting before December 31. Allow time for trades to settle. Don't wait until the last week of December — settlement delays and year-end volatility can create problems. Execute by mid-December at the latest.
- Review RMDs if applicable. RMD deadline is December 31 (or April 1 in the first year). Confirm the correct amount has been or will be distributed before year-end to avoid the 25% penalty.
More on Tax-Efficient Wealth
Tax-Loss Harvesting Explained — Turn Losses Into Tax Savings Roth Conversion Explained — Is Converting Your IRA Worth It? Your Tax-Efficient Wealth Action Plan — 6 Steps → Complete Tax Strategy GuideStop Overpaying Taxes on the Wealth You Worked to Build
Kyle Ellison is a licensed financial professional in Texas, California, Nevada, Montana, Utah, and New Mexico. Schedule a strategy session to map out your tax efficiency opportunities.
Frequently Asked Questions
What are the estimated tax payment due dates for 2026?
For 2026, estimated federal tax payments are due: Q1 (January 1 – March 31): April 15, 2026; Q2 (April 1 – May 31): June 16, 2026; Q3 (June 1 – August 31): September 15, 2026; Q4 (September 1 – December 31): January 15, 2027. State estimated tax deadlines may differ. Business owners, self-employed individuals, investors with significant capital gains, and retirees who don't have withholding should confirm quarterly payment requirements with their CPA.
What is the 2026 401(k) contribution limit?
The 2026 401(k) employee deferral limit is $23,500. The catch-up contribution for individuals 50 and older is an additional $7,500, for a total of $31,000. A new "super catch-up" contribution of $11,250 (instead of $7,500) applies to individuals age 60–63 under SECURE 2.0. IRA limits for 2026 are $7,000 ($8,000 for 50+). Employer match and profit-sharing contributions bring the overall 401(k) limit to $70,000 in 2026. Always confirm current limits with the IRS or your CPA.
Can I still contribute to my IRA after the calendar year ends?
Yes. IRA contributions for a given tax year can be made up until the tax filing deadline — April 15 of the following year (or October 15 if you extend). So contributions for 2026 can be made up until April 15, 2027. SEP-IRA contributions can be made as late as the extended filing deadline — giving business owners until October 15, 2027 to contribute for tax year 2026. This flexibility makes IRAs one of the few tax-advantaged tools that can still be adjusted after the calendar year closes.
How often should I meet with my CPA for proactive tax planning?
At minimum, twice per year: once in Q2 or early Q3 for a mid-year projection, and once in Q4 to finalize year-end strategies. Business owners and investors with more complex situations benefit from quarterly reviews. The mid-year meeting is the most overlooked — it's when there's still time to make meaningful adjustments. If your CPA only calls you during tax season, consider whether you're getting proactive planning or just compliance. The value is in the planning, not the filing.