Tax Planning Vs. Tax Filing

Author: Hazel Secco, CFP®, CDFA®

Estimated reading time: 1 minute

Table of contents

• What is the difference between tax planning and tax filing?
• Why your CPA probably is not doing tax planning
• What tax planning actually looks like across the year
• The withholding trap: a worked example
• How your CPA and your financial planner work together
• What to Do This Week
• Frequently Asked Questions
• Want the full picture?

Every spring, a version of the same conversation lands in my inbox. A woman with a serious income and a good accountant asks me, a little apologetically, whether she should find a new one. Her CPA files her return on time and never makes mistakes. But nobody has ever suggested a way to pay less tax next year, and she has started to wonder whether that is normal.

It is normal, and it is not her accountant’s failure. It is a case of misaligned expectations. Tax planning and tax filing are two different jobs, usually done by two different professionals, and most people have only ever hired one of them. Understanding tax planning vs. tax filing, and who actually does which, is the difference between a clean return and a smaller tax bill.

This article explains what each job covers, why the person filing your return is rarely the person planning your taxes, and how the two should work together, especially if equity compensation or multiple account types are part of your picture.

What is the difference between tax planning and tax filing?

Tax filing reports the past: it takes the income, deductions, and credits from a year that already happened and submits them to the IRS by the deadline. Tax planning shapes the future: it makes decisions during the year, and across multiple years, so there is less tax to report in the first place. Filing is required. Planning is optional, and that is exactly why so much money is left on the table.

By the time your return is being prepared in March, almost every number on it is locked. The stock you sold, the Roth conversion you did or did not do, the account you gave to charity from: those decisions closed on December 31. A preparer can report them accurately. Nobody can improve them after the fact.

	Tax filing	Tax planning
Direction	Backward: reports the year that ended	Forward: shapes this year and the next several
Timing	Once a year, by the April deadline	Year-round, timed to vests, conversions, and year-end windows
Typical professional	CPA or enrolled agent	Financial planner who does proactive tax work, coordinating with your CPA
Output	An accurate, on-time return	Decisions that lower lifetime taxes: what to sell, when, and from which account
Question it answers	“What do I owe?”	“What could I have owed instead?”

Why your CPA probably is not doing tax planning

Most CPAs are not doing ongoing tax planning for individual clients, and most were never hired to. During filing season a preparer may be responsible for hundreds of returns, priced per return. There is no room in that model for mid-year strategy calls about your vesting schedule. Some CPA firms do offer planning as a separate engagement, but it is the exception, and it is almost never included in the price of a return.

I wrote the first version of this article because so many women came to me asking whether they should replace their accountant, since “she only files and never suggests anything.” My answer is usually the opposite: keep the good preparer. The missing piece is not a better version of the job she is doing. It is a different job entirely, and it usually sits with a financial planner who builds tax strategy into the plan, then hands your CPA a cleaner, more intentional year to file.

A useful test: ask your accountant one question. “Do you do proactive, multi-year tax planning, or do you prepare and file what happened?” A good CPA will give you a direct answer, and either answer is fine. You just need to know which seat is empty.

What tax planning actually looks like across the year

Tax planning is a calendar, not a meeting. The decisions that lower your bill each have a window, and the window rarely lines up with filing season. For the women we work with, the recurring ones look like this:

• Vest dates. Each RSU vest is taxable income the day it lands. Deciding in advance what each vest funds, and checking the withholding against your real bracket, prevents the April surprise. We wrote about the mechanics in the RSU withholding mistake.
• Lower-income windows. A sabbatical, a job change, or the years between retirement and required distributions can open a window to convert traditional dollars to Roth at unusually low rates. The window closes December 31, long before anyone files. See the Roth conversion window.
• Which account, which asset. Where an investment lives changes how it is taxed. Interest, dividends, and fund distributions in a taxable account create tax drag every single year, which is why brokerage account taxes deserve their own strategy.
• Giving and gains. Donating appreciated stock instead of cash, or bunching two years of giving into one, changes the tax result of generosity you were going to show anyway.

None of these appear on a tax return as a line item. They appear as a smaller number on the line that matters. For the retirement-specific versions of these moves, the Retirement Tax Playbook walks through them one by one.

The withholding trap: a worked example

Here is a hypothetical composite that shows why planning and filing are different jobs. An executive has $100,000 of RSUs vest during 2026. Her employer withholds federal tax on that vest at the IRS flat supplemental rate of 22%, which applies to supplemental wages up to $1 million (IRS Publication 15). So $22,000 is sent to the IRS on her behalf.

But her salary already fills the lower brackets, so the vest itself is taxed at her marginal rate. If that rate is 35%, the real federal tax on the vest is about $35,000. The withholding is $13,000 short, and nothing about the vest paperwork warns her. Her CPA will calculate the shortfall perfectly next April. Only planning could have fixed it in June, by adjusting withholding or making an estimated payment.

The IRS safe harbor makes this manageable when you see it coming: you generally avoid an underpayment penalty if you pay in at least 90% of this year’s tax or 100% of last year’s, and that second number rises to 110% once your adjusted gross income tops $150,000, which describes most of our clients. Quarterly estimated payments are due in April, June, September, and January. We covered the logistics in how to pay estimated federal taxes.

How your CPA and your financial planner work together

The best outcome is not choosing between a CPA and a financial planner. It is putting them in the same conversation. In our practice, tax planning is built into Align360™ Wealth Management, and we coordinate directly with each client’s CPA: we share the plan behind the year’s moves, and the CPA files a return that reflects decisions made on purpose. The CPA keeps you compliant. The planning keeps the number small. Different jobs, same team.

If you hold equity compensation, own a business, or have accounts taxed three different ways, the gap between those two jobs is where the expensive mistakes live. Someone needs to own it. Make sure you know who that is in your situation, because the default answer is no one.

What to Do This Week

• Ask your CPA the one question. “Do you do proactive, multi-year tax planning, or do you prepare what happened?” Write down the answer. It tells you which seat is filled.
• Check the withholding on your next vest. If RSUs vest this year, compare the 22% supplemental withholding against your actual marginal bracket and calculate the gap now, not in April.
• Confirm your safe harbor. Pull last year’s total tax from your return, multiply by 110% if your income is over $150,000, and check whether this year’s withholding is on pace to reach it.
• Put December 15 on your calendar. Two weeks of buffer before the December 31 cutoff is the difference between executing a year-end move and reading about it in January.

Frequently Asked Questions

Do financial advisors do tax planning?

Some do, many do not. Advisors who only manage investments rarely touch tax strategy, and advisors cannot file returns unless they are also credentialed preparers. Ask a prospective advisor how tax planning shows up in their process: whether they review your return, plan around vest dates and conversions, and coordinate with your CPA. At Align, that work is part of the core relationship, not an add-on.

Should I fire my CPA if they do not do tax planning?

Usually not. An accurate, responsive preparer is worth keeping. Filing and planning are different jobs, and expecting one professional to do both for the price of a tax return is how the planning seat ends up empty. Keep the good CPA, add the planning, and make sure the two talk to each other during the year, not just in April.

When should tax planning happen during the year?

Continuously, with two hard checkpoints. Mid-year, review withholding and estimated payments while there is still time to adjust, especially after a vest, a raise, or a job change. Before mid-December, make the year-end decisions: conversions, charitable gifts, and loss harvesting all close on December 31. Anything discussed for the first time in April is a year too late.

Is tax planning worth it if I already have a good accountant?

A good accountant makes filing painless, but filing cannot change the number. Planning is worth the effort when your situation has moving parts: equity compensation, multiple account types, charitable giving, or a retirement transition. The more of those you have, the more a December decision can change what your accountant reports in April.

Want the full picture?

If you want the complete breakdown, including the three advisor compensation models, why tax preparation isn’t tax planning, and the four questions every high-net-worth woman should ask her advisor, download my free guide, 7 Things Nobody Teaches Independent Women About Building Wealth (https://alignfinancialsolutions.com). It’s a 15-minute read.

Hazel Secco, CFP®, CDFA®, is the founder of Align Financial Solutions, a fee-only fiduciary firm that works with executive women on retirement planning, equity compensation, and tax strategy.

Book a free 15-minute Align Call: https://alignfinancialsolutions.com/book-a-call/

Whether we work together or not, you’ll walk away with clarity on your best next step.

https://alignfinancialsolutions.com · https://www.youtube.com/@AlignYourRetirement · https://linkedin.com/in/hazel-secco

Disclaimer: Advisory services are offered through Align Financial Solutions LLC (“AFS”), an Investment Advisor in the State of New Jersey. This article is for educational purposes only and does not constitute personalized tax, legal, investment, or financial planning advice. Rules and figures are current for 2026 and subject to change. All client scenarios are hypothetical composites for illustration and do not represent any specific client outcome. Consult a qualified professional about your specific situation.

Sources

1. IRS, Underpayment of Estimated Tax by Individuals Penalty: https://www.irs.gov/payments/underpayment-of-estimated-tax-by-individuals-penalty
2. IRS, Publication 15 (Employer’s Tax Guide), supplemental wage withholding rates: https://www.irs.gov/publications/p15