Most people spend thirty years asking how much they can save and almost no time asking how that money will be taxed when they spend it. The answer matters more than it seems. Two retirees can hold the same total balance, spend the same amount each year, and finish with very different results simply because one of them kept all of it in a single type of account.
That is the idea behind tax diversification in retirement: holding your savings in accounts that are taxed in different ways, so that you can choose which tax rule applies each time you need money. It is the same logic as spreading investments across asset classes, applied to the tax code instead of the market. You are not trying to avoid tax, which is rarely possible. You are trying to keep control over when, how much and at what rate it arrives.
For professionals, federal employees and business owners in Puerto Rico, the idea has an extra layer. Income can be reported to Hacienda, to the IRS, or to both, and the same dollar can be treated differently on each side. This guide explains the three kinds of accounts, how the 2026 federal numbers shape your choices, where Puerto Rico changes the picture, and how to put the pieces together in a plan you can actually follow.
Why One Big Account Becomes One Big Tax Bill
Before looking at solutions, it helps to understand the problem. Many households arrive at retirement with most of their wealth in one place: a Thrift Savings Plan balance, a 401(k), or an IRA. Every dollar in those accounts was deducted or deferred on the way in, which means every dollar is ordinary income on the way out.
The Single-Setting Problem
A retirement portfolio held entirely in tax-deferred accounts works like a thermostat with one setting. When you need $90,000 for a year, you withdraw $90,000 plus enough extra to cover the tax, and all of it is taxed as ordinary income. In a year with a large one-time expense, the withdrawal is the income, and it pushes you into a higher bracket.
With a mix of accounts, you can pull a little from each source and keep your taxable income steady. In a heavier year, you can lean on a source that does not add to taxable income at all. That flexibility is the real benefit of diversifying.
The Clock That Starts at Age 73
The second problem is timing. Tax-deferred accounts do not let you wait forever. Required minimum distributions generally begin at age 73 for people born between 1951 and 1959, and at age 75 for those born in 1960 or later. The amount is set by a formula based on your balance and life expectancy, not by what you need or want.
A retiree who has been living comfortably on $70,000 a year may suddenly be forced to take out $110,000 because the account has grown. The extra $40,000 is taxed whether it is needed or not, and it can raise Medicare premiums and the taxable share of Social Security too.
Read Also: How Stock Options and RSUs Are Taxed When You Retire
The Three Tax Buckets Explained
Planners describe retirement savings as three buckets, each with its own rule about when tax is due.
Bucket One: Taxable Accounts
These are ordinary brokerage accounts, savings accounts, certificates of deposit and similar holdings. You fund them with money you have already paid tax on, and you owe tax each year on the interest and dividends they produce. When you sell an investment for a profit, you pay capital gains tax rather than ordinary income tax.
The advantage is flexibility: no withdrawal ages, no required distributions, and lower rates on long-term gains. For 2026, the federal rate on long-term capital gains is 0% for taxable income up to $49,450 for a single filer and $98,900 for a married couple filing jointly, according to the Tax Foundation’s 2026 tax bracket summary.
Bucket Two: Tax-Deferred Accounts
This bucket holds traditional IRAs, traditional 401(k) and 403(b) balances, the traditional side of the TSP, and employer plans in general. Contributions were usually deducted, growth was untaxed, and withdrawals are taxed as ordinary income. For most households in their fifties and sixties, this is the largest bucket by far.
The weakness is that you do not fully own it. A share of every dollar belongs to the tax authorities, decided by the rates in force when you withdraw, and required distributions mean you cannot simply leave it alone.
Bucket Three: Tax-Free Accounts
The third bucket includes Roth IRAs, Roth 401(k) and Roth TSP balances, and, in some cases, the cash value of permanent life insurance used with care. Contributions are made with after-tax dollars. Qualified withdrawals, including growth, are not taxed federally. The original owner of a Roth IRA is not subject to required distributions, and since 2024 Roth balances inside employer plans are no longer subject to them either.
A few points explain why this bucket is so valuable in a plan:
- It lets you take money in a high-expense year without raising your taxable income.
- It is generally the best asset to leave to heirs, because they usually receive it without income tax on qualified distributions.
- It gives you a hedge against future tax increases, since its value does not depend on the rate in force later.
- It does not increase your income for Medicare surcharge purposes when withdrawals are qualified.
The cost is that you pay tax today, by contributing after-tax money or converting traditional money.
Where Puerto Rico Changes the Math
Puerto Rico residents add a second tax system, and that can change which bucket works best.
Two Systems, One Retirement
Puerto Rico has its own income tax code, and its rates are graduated from 0% up to 33%, with the top rate applying above $61,500 of net taxable income. Long-term capital gains on assets held more than one year are generally taxed at a flat 15% rate. At the same time, U.S. citizens who live in Puerto Rico may still have federal filing obligations depending on the source of their income. Income sourced in Puerto Rico can often be excluded from federal tax for bona fide residents, but income from U.S. sources generally cannot.
That distinction is what makes income tax planning in Puerto Rico more detailed than a mainland plan. A single retirement paycheck can be taxable on both returns, with credits designed to reduce the overlap, and each bucket can behave differently depending on where its income is sourced.
Federal Pay and Federal Plans
Federal employees who retire in Puerto Rico face a particular version of this. Income from the TSP and from a federal pension is generally treated as federal-source income, which stays within reach of the IRS even when you live on the island. That makes the TSP a different kind of bucket from a Puerto Rico-qualified plan.
If part of your TSP is in the Roth side, ask how each government treats qualified distributions before you count on them being tax-free everywhere. The federal answer is well established. The Puerto Rico answer should be confirmed against your own facts rather than assumed.
Social Security and Hacienda
One favorable fact for Puerto Rico retirees is that Hacienda does not tax Social Security benefits. Federal rules may still tax up to 85% of benefits, depending on your combined income, so the net effect varies by household. This matters for bucket planning because Social Security acts as a background layer of income that sits underneath every withdrawal you take. The more other income you report, the more of your benefit can become taxable federally.
Using the Brackets as a Planning Tool
Once you know your buckets, you can use the brackets as a budget: each is a ceiling you can choose to fill or leave alone.
Fill the Lower Brackets on Purpose
For 2026, the federal brackets for a married couple filing jointly are 10% up to $24,800 of taxable income, 12% up to $100,800, 22% up to $211,400 and 24% up to $403,550, with higher rates above that. For a single filer, the 12% bracket ends at $50,400 and the 22% bracket ends at $105,700. The standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly. These figures come from the same Tax Foundation 2026 summary.
Put those numbers together and a married couple with no other adjustments can report roughly $133,000 of ordinary income before the 22% bracket begins. That is $100,800 of taxable income plus $32,200 of standard deduction, before any additional age-based deductions. If you are in your early retirement years and living on less than that, you are leaving cheap bracket space unused. Converting part of a traditional balance to Roth, or withdrawing from it on purpose, lets you pay tax at 10% or 12% now rather than 22% or 24% later.
A Quick Look at the 0% Capital Gains Zone
The capital gains brackets move on a separate track. A couple whose taxable income stays under $98,900 can sell appreciated investments and owe no federal tax on the long-term gain. If your ordinary income is mostly Social Security and modest withdrawals, you may have room to sell winners and rebalance at no federal tax cost.
The Puerto Rico side differs, because Hacienda taxes long-term gains at 15%. A sale that is free federally may not be free locally, so check both returns before you sell.
Medicare, Social Security and the Hidden Thresholds
Some of the biggest effects of your withdrawals come through programs that react to your income.
The Medicare Surcharge Nobody Mentions
Medicare Part B and Part D premiums rise when income crosses certain lines, through a surcharge known as IRMAA. For 2026, the standard Part B premium is $202.90 per month. The first surcharge level applies when modified adjusted gross income exceeds $109,000 for an individual or $218,000 for a married couple filing jointly, which raises the monthly Part B premium to $284.10, as outlined in this overview of 2026 Part B premiums and IRMAA brackets.
Two details make this relevant for tax diversification. First, the surcharges are based on income from two years earlier, so a large Roth conversion in 2026 can raise your premiums in 2028. Second, qualified Roth withdrawals do not count toward the calculation, while traditional withdrawals and realized gains do. A retiree with a balanced set of buckets can often stay below a threshold simply by choosing which account to draw from in a given year.
How Much of Your Benefit Gets Taxed
Federal tax on Social Security depends on a measure called combined income, which counts adjusted gross income, tax-exempt interest and half of your benefit. Depending on the total, up to 85% of your benefit can be included in taxable income. Because every traditional withdrawal adds to that total, a heavy tax-deferred bucket can pull more of your benefit into the tax base.
Drawing a portion of your spending from Roth or from taxable principal, which is not income, keeps the total lower.
A Story of Two Retirements
The example below is illustrative only and uses rounded figures, not a projection or a recommendation.
Same Savings, Different Choices
Consider two couples, both retiring at 65 with $1.2 million. The first couple holds everything in a traditional TSP and IRA. The second has $750,000 in tax-deferred accounts, $250,000 in Roth accounts and $200,000 in a brokerage account.
Both need about $100,000 of spending each year. The first couple must withdraw roughly $120,000 to cover spending and tax, and every dollar counts as ordinary income. When required distributions begin, their taxable income rises further, and they have no way to lower it.
The second couple can draw $60,000 from the tax-deferred bucket, take $15,000 of long-term gains from the taxable account at a low rate, and pull $25,000 from Roth without adding to income. Their taxable income stays in the 12% bracket, below the Medicare surcharge line, and with room to spare. In a year with a $40,000 emergency, they cover it from the Roth bucket and their bracket does not move.
Neither couple did anything clever with investments. The second simply has options, and over twenty or thirty years options become savings, security and a larger legacy.
Building the Buckets Before You Retire
Diversification is easier to build while you work. The central decision is whether the next dollar goes into a traditional or a Roth account.
Roth or Traditional: The Core Decision
The comparison of Roth IRA vs traditional IRA comes down to one question: will your tax rate be higher now or in retirement? If you expect your rate to be lower later, a deduction today is worth more. If you expect it to be higher, or if you value flexibility, paying tax now is worth more. Since no one knows future rates, the common answer for people with large traditional balances is to split contributions and build the Roth bucket gradually.
Peak earning years often favor the deduction, while the gap between retirement and required distributions often favors Roth conversions.
Employer Plans and Business Owners
Federal employees can split TSP contributions between traditional and Roth, which makes the bucket choice easy to automate. Business owners have a wider menu and the freedom to time income and deductions. For owners, planning also means thinking about when you will sell: that year can be the highest-income year of your life, and a tax-free bucket is especially useful afterward.
Mistakes That Undo the Benefits
A few patterns quietly reduce the value of tax diversification.
Common Errors to Avoid
- Converting too much in one year. A large Roth conversion can push you into a higher bracket and trigger Medicare surcharges two years later.
- Ignoring the Puerto Rico side. A strategy that works federally may create a local tax bill, or the reverse.
- Withdrawing in the same order forever. A fixed rule such as “taxable first, then deferred, then Roth” is a starting point, not a plan. Many retirees do better blending accounts.
- Forgetting beneficiaries. Roth and traditional accounts are inherited differently, and your heirs may be in a different bracket than you.
- Never reviewing. Tax law changes, income changes and goals change. A bucket plan that is not reviewed drifts.
Review the plan every year, ideally before December, while there is still time to act: how much bracket room is left, how close you are to a Medicare threshold, and whether a Roth conversion makes sense this year. Ask the same questions about the Puerto Rico return.
Turning the Idea Into a Plan
A good plan does not need to be complicated. It needs to be written down and revisited each year.
A Simple Starting Framework
Start by listing every account and labeling it taxable, tax-deferred or tax-free. Add the balances and see the percentages. Many people discover that 80% or more sits in one bucket. Then decide on a target mix, which depends on your age, income, goals and how much flexibility you want. Finally, pick the first action: redirecting new contributions, using a low-income year for a conversion, or reorganizing a taxable account to take advantage of the 0% gains zone.
A tax planning advisor can help you test each choice against both tax systems before you commit. In practice, the financial planning process in Puerto Rico usually moves in this order: map your accounts, model your income across the years, test several withdrawal strategies, and then decide.
When to Ask for Help
If you are within five years of retirement, hold a large TSP or IRA balance, own a business, or expect a sale or inheritance, a professional review is worth the time. Retirement planning services in Puerto Rico can bring the pieces together in one place, so that investment, tax and insurance decisions support each other.
Read Also: Tax Planning for a Large One-Time Bonus Before Retirement
Conclusion
Tax diversification in retirement is not a trick or a loophole. It is a way of keeping options. When all of your savings follow one rule, the rule decides your future. When you hold taxable, tax-deferred and tax-free accounts, you decide which rule applies in each year, based on your needs, the brackets, Medicare thresholds and your family’s goals.
The numbers for 2026 make the case clear. Bracket space is available at 10% and 12%, the 0% capital gains zone reaches nearly $99,000 for couples, and Medicare surcharges begin at $109,000 of income for individuals and $218,000 for couples. Each of those lines can be managed, but only by someone who has more than one kind of account to draw from. You do not have to rebuild your finances in a weekend. Start by labeling your accounts, picking one action for this year, and reviewing the result next year. Small, steady moves compound just as investments do.
Disclaimer: This article is for educational purposes only and does not constitute individualized financial, tax, or legal advice. Tax rules vary and change, so confirm current federal and Puerto Rico requirements with a licensed professional regarding your situation. Examples are illustrative and not guarantees of future results.
