How Tax Brackets Work in Retirement: Plan Withdrawals to Stay in a Lower Bracket

The Core Misconception

Ask most people what happens when they earn more money and cross into a higher tax bracket, and they'll say, "My entire income gets taxed at the new, higher rate." This is one of the most widespread misunderstandings in personal finance — and it's completely wrong.

The U.S. income tax system is progressive: it applies different rates to different portions of your income. Only the dollars that fall within each bracket are taxed at that bracket's rate. Understanding this distinction is foundational to smart tax planning.

How Tax Brackets Actually Work

In 2025, the federal income tax brackets for a single filer look like this:

Tax Rate	Taxable Income Range (Single)	Taxable Income Range (Married Filing Jointly)
10%	$0 – $11,925	$0 – $23,850
12%	$11,926 – $48,475	$23,851 – $96,950
22%	$48,476 – $103,350	$96,951 – $206,700
24%	$103,351 – $197,300	$206,701 – $394,600
32%	$197,301 – $250,525	$394,601 – $501,050
35%	$250,526 – $626,350	$501,051 – $751,600
37%	Over $626,350	Over $751,600

Consider a single filer with $80,000 in taxable income. They are in the 22% bracket — but here's what they actually pay:

• 10% on the first $11,925 = $1,192.50
• 12% on $11,926–$48,475 = $4,386
• 22% on $48,476–$80,000 = $6,934.28
• Total federal tax: $12,512.78

Their marginal rate is 22% — but their effective rate is only about 15.6%. The "22% bracket" label only describes the rate on the income in that tier.

Marginal Rate vs. Effective Rate

These two rates are not the same, and confusing them leads to poor decisions.

Your marginal tax rate is the rate applied to your next dollar of income. It tells you the tax cost of earning more — whether from a bonus, a part-time job, or a Roth conversion. It's the rate that matters for decisions at the margin.

Your effective (average) tax rate is your total tax liability divided by your total income. It reflects your actual overall tax burden and is always lower than your marginal rate for most taxpayers.

Practical implications: if someone offers you $5,000 of extra freelance income and you're in the 22% bracket, you'll pay 22% of that $5,000 in federal tax — not 22% of all your income. And if you're deciding whether to do a Roth conversion, the marginal rate is the cost you're paying on the converted dollars.

Not All Income Hits the Same Brackets

The brackets above apply to ordinary income — wages, self-employment income, traditional IRA withdrawals, interest, and most other income types. But two categories get preferential treatment:

• Long-term capital gains and qualified dividends are taxed at 0%, 15%, or 20%, depending on your total income. These rates are always lower than ordinary income rates for the same income level.
• Social Security benefits may be 0%, 50%, or up to 85% included in taxable income, depending on your "combined income" (AGI plus non-taxable interest plus half of Social Security).

Capital gains are taxed after ordinary income — they are "stacked on top." This means a retiree with $40,000 in ordinary income and $20,000 in long-term capital gains is taxed at 0% on the capital gains (since combined income stays under the $47,025 single threshold in 2025) even though ordinary income alone might push them to the 12% bracket.

Why Bracket Awareness Matters for Planning

Once you understand how brackets work, you can make better decisions around these key planning opportunities:

• Roth conversions: Convert traditional IRA funds up to the top of your current bracket to lock in today's lower rate before future income (RMDs, Social Security) pushes you higher.
• Capital gain realization: If your income keeps you in the 0% capital gains bracket, you can intentionally sell appreciated investments with no federal capital gains tax — a free opportunity to reset your cost basis.
• Retirement withdrawal timing: In years when ordinary income is temporarily low (before Social Security, before RMDs), you may have room to take larger IRA withdrawals at lower rates than you would later.
• Income timing decisions: Knowing your bracket helps you evaluate whether to defer income (take a bonus next year) or accelerate deductions (prepay mortgage interest, bunch charitable donations) to optimize your tax picture.

The Impact of Deductions on Your Bracket

Tax brackets are applied to taxable income — not gross income. This means your standard deduction (or itemized deductions, whichever is larger) directly shifts what bracket you're actually in. In 2025, the standard deduction is $15,050 for single filers and $30,100 for married couples. A couple earning $120,000 in combined wages only has about $89,900 in taxable income after the standard deduction — comfortably within the 22% bracket rather than the 24%.

This is why deductions are so powerful: every dollar of deduction reduces your taxable income at your marginal rate. A $1,000 deduction saves a 22% bracket taxpayer $220 in taxes, and saves a 32% bracket taxpayer $320.