Why Do Some Retirees Pay More in Taxes Than They Expected?
Most people assume retirement will lower their taxes. For a lot of retirees, the exact opposite happens. They spend decades saving in tax-deferred accounts, only to discover that taxes, Medicare premiums, and required withdrawals are taking a much bigger bite than they ever expected. And by the time they realize it, their options to do anything about it are limited.
In this video, we walk through the retirement tax mistake that catches so many people off guard, why it happens, and what you can do now while you still have flexibility to change the outcome.
Retirement tax planning connects directly to how you structure withdrawals and income throughout retirement. You may also find our guide on what to do with a large IRA before RMDs start helpful for understanding how tax-deferred savings can affect your future income and tax picture.
Why Tax-Deferred Savings Create a Retirement Tax Problem
Most people save the majority of their retirement money in tax-deferred accounts like 401(k)s and traditional IRAs. During your working years, that feels like the right move. You get the tax deduction up front. Your investments grow without being taxed each year. Everything seems to be working exactly as it should.
But what many people forget is that the money in those accounts hasn't been taxed yet. Every dollar is sitting there with a future tax bill attached to it. When retirement comes and withdrawals begin, every dollar coming out shows up as taxable income. That can set off a chain reaction most people never planned for.
The Real Problem: Saving Into Only One Tax Bucket
The retirement tax mistake isn't about how much you saved. It's about where you saved it. When almost all of your retirement assets sit in tax-deferred accounts, every source of income in retirement gets taxed the same way. You don't have flexibility. You can't control which bucket you pull from to manage your tax picture in any given year.
Ideally, retirement income should come from multiple tax buckets. Think of it as three categories working together: taxable accounts like brokerage accounts, tax-deferred accounts like traditional IRAs and 401(k)s, and tax-free accounts like Roth IRAs. The more balanced those buckets are going into retirement, the more control you have over your taxes once withdrawals begin.
That control matters because retirement isn't just about how much you saved. It's about how efficiently you can draw income from what you built.
Why This Catches People Off Guard
During your working years, most financial advice focuses on saving money, not on future tax planning. So people spend 30 or 40 years building large retirement account balances without thinking much about what happens when the withdrawals begin.
Then retirement arrives and taxes become part of every decision. Social Security timing, Medicare enrollment, withdrawal sequencing, required minimum distributions. All of it has tax implications. And if the account structure isn't set up to give you flexibility, your options narrow quickly.
Three Steps to Start Addressing This Now
Step 1: Understand Where Your Savings Actually Sit
Start by taking inventory of your retirement savings across all account types. How much is in tax-deferred accounts? How much is in Roth accounts? How much is in taxable brokerage accounts? That picture tells you how much flexibility you have and where the gaps are.
Step 2: Project What Your Retirement Income Will Look Like
Map out what your income sources will look like once Social Security and required minimum distributions begin. What bracket will those combined income sources put you in? Are there years before those kick in where income is lower and tax planning is more favorable? That projection is where the planning opportunity lives.
Step 3: Think About Building Flexibility Now
Depending on your situation, that could mean Roth contributions through your employer plan, Roth conversions in lower-income years, or building assets in taxable accounts outside of retirement accounts. Every situation is different, but the common thread is acting before your options narrow. The earlier you start, the more you can do.
For a closer look at how Roth conversions fit into this kind of planning, see our video on how much is too much when converting to Roth before RMDs .
If you're concerned about how IRA withdrawals can affect your benefits, see our video on why your Social Security may be taxed more than you expect .
Frequently Asked Questions About Retirement Tax Planning
Why do taxes often go up in retirement?
Taxes in retirement can be higher than expected for several reasons. When most of your savings are in tax-deferred accounts like 401(k)s and traditional IRAs, every withdrawal is taxed as ordinary income. That income can push more of your Social Security benefits into taxable territory, trigger Medicare premium surcharges through IRMAA, and once required minimum distributions begin, force withdrawals larger than you actually need. The combination of multiple taxable income sources in retirement often results in a higher effective tax rate than many retirees anticipated.
What is the biggest retirement tax mistake people make?
The most common retirement tax mistake is saving almost exclusively into tax-deferred accounts like 401(k)s and traditional IRAs without building any tax-free or taxable assets alongside them. When all of your retirement income is taxed the same way, you lose flexibility to manage your tax bracket in retirement. You can't choose which bucket to pull from in a given year to keep income below key thresholds. That lack of flexibility becomes increasingly costly once Social Security, Medicare, and required minimum distributions are all in play at the same time.
What are the three tax buckets in retirement planning?
Retirement tax planning typically involves three categories of accounts. Taxable accounts, such as brokerage accounts, where gains are subject to capital gains tax but there are no required distributions. Tax-deferred accounts, such as traditional IRAs and 401(k)s, where contributions were made pre-tax and all withdrawals are taxed as ordinary income. And tax-free accounts, such as Roth IRAs and Roth 401(k)s, where contributions were made after tax and qualified withdrawals are generally income-tax-free. Having assets spread across all three gives you the most flexibility to manage your tax picture in retirement.
How do required minimum distributions affect retirement taxes?
Required minimum distributions force you to withdraw a calculated amount from tax-deferred accounts each year starting at a certain age, generally age 73 though the RMD starting age depends on birth year. Those withdrawals are taxed as ordinary income regardless of whether you need the money. If your IRA balances are large, the required distributions can push you into a higher tax bracket, increase the taxable portion of your Social Security benefits, and trigger Medicare premium surcharges. Planning ahead to reduce tax-deferred balances before RMDs begin is one of the most effective ways to manage this.
What is a Roth conversion and how does it help with retirement taxes?
A Roth conversion is the process of moving money from a traditional IRA or 401(k) into a Roth IRA. You pay income tax on the converted amount in the year of conversion, and from that point forward the money grows tax-free and qualified withdrawals are generally income-tax-free. For people with large tax-deferred balances, doing Roth conversions in lower-income years before Social Security and RMDs begin can meaningfully reduce future taxable income and give you more flexibility over your tax picture in retirement.
How does retirement income affect Medicare premiums?
Medicare Part B and Part D premiums are income-based. Higher-income retirees pay more through a surcharge called IRMAA, the Income-Related Monthly Adjustment Amount. The calculation is based on your modified adjusted gross income from two years prior. Large IRA withdrawals, Roth conversions, or required minimum distributions can push income above IRMAA thresholds and increase your Medicare premiums significantly. This is one of the reasons managing retirement income across multiple tax buckets matters beyond just the income tax itself.
When is the best time to start retirement tax planning?
The best time to start is as early as possible, ideally 10 or more years before retirement while you still have flexibility to shift contributions, do Roth conversions in favorable tax years, and build a more balanced account structure. The window to do meaningful tax planning narrows as required minimum distributions approach and income sources become less flexible. That said, even five years before retirement there are often meaningful planning moves available. The key is acting before your options are limited rather than after the tax situation has already set in.
How does Social Security get taxed in retirement?
Depending on your total income, up to 85% of your Social Security benefits can be subject to federal income tax. The IRS uses a formula called provisional income to calculate how much is taxable. Provisional income includes adjusted gross income, tax-exempt interest, and half of your Social Security benefits. The more taxable income you have from other sources like IRA withdrawals and required minimum distributions, the more of your Social Security becomes taxable. Managing withdrawal sources strategically can help keep more of your Social Security benefit out of the taxable calculation.
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Investment advice is offered through Bayntree Wealth Advisors, LLC, an SEC-registered investment adviser. Insurance and annuity products are offered separately through Bayntree Wealth Advisors. Bayntree does not provide, and no statement contained herein shall constitute, tax or legal advice. You should consult a tax or legal professional on any such matters. Opinions expressed herein are solely those of Bayntree Wealth Advisors. All content is for informational purposes only and is not intended to provide the basis for any financial decisions.
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