Retirement accounts are the single most powerful tax reduction tool available to most Americans. They reduce your taxable income today, grow tax-free for decades, and in some cases let you withdraw money tax-free in retirement. No other section of the tax code offers this combination of benefits.
Yet most people use only one or two accounts — usually whatever their employer offers — without understanding the full range of options. A self-employed business owner who knows about a Solo 401(k) can shelter up to $70,000 per year from taxes. Someone who only knows about a Traditional IRA is limited to $7,000. Same person, same income, dramatically different tax results.
This guide covers every major retirement account, explains the tax benefits of each, and helps you build a strategy that maximizes your tax savings at every income level.
How Retirement Accounts Save You Money on Taxes
Retirement accounts work through one of two tax mechanisms:
Tax-deferred (Traditional accounts). You get a tax deduction when you contribute. The money grows without being taxed. You pay income tax when you withdraw in retirement. This saves you money if your tax rate in retirement is lower than your tax rate today.
Tax-free growth (Roth accounts). You contribute after-tax money — no deduction upfront. The money grows tax-free. Withdrawals in retirement are completely tax-free. This saves you money if your tax rate in retirement is higher than (or equal to) your tax rate today.
Both mechanisms are enormously valuable. The question isn't which one is "better" — it's which one is better for your specific situation right now.
A third category exists for one specific account:
Triple tax advantage (HSA). Tax-deductible going in, tax-free growth, and tax-free withdrawals for medical expenses. The Health Savings Account is the only account in the entire tax code that offers all three benefits.
Accounts for Employees
401(k)
The 401(k) is the most common employer-sponsored retirement plan. If your employer offers one, it should be your first priority — especially if they offer a match.
2026 contribution limits:
- Employee contribution: $23,500 (under age 50)
- Catch-up contribution: additional $7,500 (age 50+)
- Total employee limit: $31,000 (age 50+)
- Total combined limit (employee + employer): $70,000 (under 50), $77,500 (50+)
Tax treatment (Traditional 401k): Your contributions reduce your taxable income dollar-for-dollar. If you earn $100,000 and contribute $23,500, your taxable income drops to $76,500. At the 22% bracket, that saves $5,170 in federal taxes immediately. The money grows tax-deferred and you pay income tax on withdrawals in retirement.
Tax treatment (Roth 401k): Many employers now offer a Roth 401(k) option. Contributions are made with after-tax dollars — no deduction today. But all growth and withdrawals in retirement are completely tax-free. Same contribution limits as Traditional.
Employer match: If your employer matches contributions (e.g., 50% of the first 6% of salary), this is free money. Always contribute at least enough to get the full match. An employer that matches 50% of 6% on a $100,000 salary adds $3,000 to your retirement — that's an instant 50% return before any investment growth.
Important: Employer match contributions are always pre-tax, even if you choose the Roth option for your own contributions. Employer match does not count toward your $23,500 employee limit — it counts toward the overall $70,000 combined limit.
Required Minimum Distributions (RMDs): Starting at age 73, you must begin withdrawing from Traditional 401(k) accounts. The annual amount is based on your account balance and life expectancy. Roth 401(k) accounts are also subject to RMDs, but you can avoid this by rolling to a Roth IRA before age 73.
403(b)
The 403(b) is essentially a 401(k) for employees of public schools, universities, hospitals, and nonprofits. Same contribution limits. Same tax treatment. The main difference is the investment options — 403(b) plans often include annuity contracts alongside mutual funds.
457(b)
Government employees and some nonprofit employees have access to 457(b) plans. The key advantage: if you have both a 457(b) and a 401(k) or 403(b), you can max out both. That's $23,500 + $23,500 = $47,000 in tax-deferred (or Roth) contributions per year — double what most people can contribute.
Also, 457(b) plans have no 10% early withdrawal penalty for leaving employment at any age. If you plan to retire early, this account is extremely valuable.
Thrift Savings Plan (TSP)
The TSP is the retirement plan for federal employees and members of the military. Same contribution limits as a 401(k). The TSP is widely regarded as one of the best retirement plans available because of its extremely low expense ratios (the funds charge around 0.04%, compared to 0.5-1.0% in many employer 401(k) plans).
Both Traditional and Roth options are available.
Individual Retirement Accounts (IRAs)
Traditional IRA
Anyone with earned income can contribute to a Traditional IRA.
2026 contribution limits:
- $7,000 (under age 50)
- $8,000 (age 50+)
Tax deductibility depends on your situation:
If you're NOT covered by an employer plan: Your Traditional IRA contributions are fully deductible regardless of income.
If you ARE covered by an employer plan: Deductibility phases out at higher income levels.
- Single: Phase-out begins at approximately $79,000 AGI, fully phased out at $89,000
- Married filing jointly (and you're the one with the plan): Phase-out approximately $126,000-$146,000
- Married filing jointly (spouse has the plan, you don't): Phase-out approximately $236,000-$246,000
If your contribution isn't deductible, it usually makes more sense to contribute to a Roth IRA instead (or use the backdoor Roth strategy — explained below).
RMDs begin at age 73, just like 401(k) accounts.
Roth IRA
The Roth IRA is one of the most powerful accounts in the tax code. Contributions are after-tax, but all growth and qualified withdrawals are completely tax-free — forever.
2026 contribution limits:
- Same as Traditional IRA: $7,000 (under 50), $8,000 (50+)
- But this is a combined limit — your total Traditional IRA and Roth IRA contributions can't exceed $7,000/$8,000
Income limits for direct contributions:
- Single: Ability to contribute phases out at approximately $150,000-$165,000 AGI
- Married filing jointly: Phase-out approximately $236,000-$246,000
If your income exceeds these limits, you can't contribute directly to a Roth IRA. But you can use the backdoor Roth strategy (explained below).
Why the Roth IRA is so valuable:
Tax-free growth for decades. If you contribute $7,000 at age 30 and it grows to $70,000 by age 65, all $63,000 in growth is completely tax-free.
No RMDs. Unlike Traditional IRAs and 401(k)s, Roth IRAs have no required minimum distributions. Your money can grow tax-free for your entire life and pass to heirs.
Tax-free in retirement. In retirement, Roth withdrawals don't count as taxable income. This means they don't increase your tax bracket, don't trigger the 3.8% Net Investment Income Tax, and don't cause more of your Social Security to become taxable.
Contribution withdrawal flexibility. You can withdraw your original contributions (not earnings) at any time, for any reason, without tax or penalty. This makes the Roth IRA a dual-purpose account — retirement savings with an emergency fund fallback.
Qualified withdrawals. To withdraw earnings tax-free, you must be at least 59.5 and the account must have been open for at least 5 years.
Roth vs. Traditional: The Decision Framework
This is one of the most debated questions in personal finance. Here's how to think about it:
Choose Traditional (tax-deferred) when:
- You're in a high tax bracket now and expect to be in a lower bracket in retirement
- You need the tax deduction now to reduce your current tax bill
- You're in your peak earning years (50s-60s) and retirement is close
- Your state has high income tax now but you'll retire in a no-tax state
Choose Roth (tax-free) when:
- You're in a low tax bracket now (early career, low-income year, between jobs)
- You expect to be in the same or higher bracket in retirement
- You're young and have decades of tax-free growth ahead
- You want to avoid RMDs in retirement
- You believe tax rates will increase in the future
The ideal strategy for many people: Contribute to both types throughout your career. This creates "tax diversification" — having both tax-deferred and tax-free money in retirement gives you flexibility to withdraw from whichever source minimizes your taxes each year.
Self-Employed Retirement Plans
Self-employed individuals have access to retirement plans with much higher contribution limits than IRAs — sometimes 10x higher. These are the most powerful tax deductions available to business owners.
SEP-IRA (Simplified Employee Pension)
The SEP-IRA allows self-employed individuals and small business owners to contribute up to 25% of net self-employment income (or 25% of W-2 compensation for S-Corp owners), with a maximum of approximately $70,000.
How it works:
- Only employer contributions — there's no employee contribution component
- For sole proprietors: effectively about 20% of net self-employment income after the self-employment tax deduction
- For S-Corp owners: 25% of your W-2 salary
- All contributions are tax-deductible
- Grows tax-deferred, taxed on withdrawal
Example: You're a sole proprietor with $200,000 in net self-employment income. Your SEP-IRA contribution can be approximately $37,000 (the calculation involves adjusting for the self-employment tax deduction). At the 24% bracket, that's roughly $8,900 in tax savings.
Advantages:
- High contribution limits
- Easy to set up (can be opened at any brokerage)
- Can be established and funded up until your tax filing deadline (including extensions)
- No annual filing requirements
- Flexible — contribute as much or as little as you want each year (up to the limit)
Disadvantage:
- If you have employees, you must contribute the same percentage for them as you contribute for yourself. This can become expensive with multiple employees.
- No Roth option
- No catch-up contributions for those 50+
Best for: Self-employed individuals without employees who want high contribution limits with minimal administrative burden.
Solo 401(k) (Individual 401k)
The Solo 401(k) is the most powerful retirement plan for self-employed individuals without employees (other than a spouse). It combines employee and employer contributions to allow the highest total contribution.
2026 contribution limits:
- Employee contribution: $23,500 (under 50), $31,000 (50+)
- Employer contribution: up to 25% of net self-employment income (or 25% of W-2 compensation)
- Total maximum: $70,000 (under 50), $77,500 (50+)
Why it beats the SEP-IRA:
The Solo 401(k) has an employee contribution component that the SEP-IRA lacks. This matters at lower income levels.
Example at $60,000 net income:
- SEP-IRA maximum: approximately $11,100 (20% effective rate)
- Solo 401(k) maximum: $23,500 (employee) + approximately $11,100 (employer 20%) = $34,600
At lower income levels, the Solo 401(k) allows significantly higher contributions because you can contribute $23,500 as an employee regardless of your income level (as long as you have at least that much in earned income).
At high income levels (above roughly $300,000), the SEP-IRA and Solo 401(k) reach similar maximums because the employer contribution maxes out at the same dollar amount.
Additional Solo 401(k) advantages:
- Roth option available (for the employee contribution portion)
- Loan provision — you can borrow up to $50,000 or 50% of the account balance
- Catch-up contributions for those 50+ ($7,500 additional)
- Can include your spouse as an employee, effectively doubling household contributions
Disadvantages:
- More paperwork to establish (plan document, EIN)
- Annual Form 5500-EZ filing required if assets exceed $250,000
- Cannot have employees other than yourself and your spouse
- Must be established by December 31 (not the filing deadline like SEP-IRA)
Best for: Self-employed individuals without employees who want the maximum possible tax deduction. This is the gold standard for solo business owners.
SIMPLE IRA
The SIMPLE IRA (Savings Incentive Match Plan for Employees) is designed for small businesses with 100 or fewer employees.
2026 contribution limits:
- Employee: $16,500 (under 50), $20,000 (50+)
- Employer must either match employee contributions up to 3% of compensation, or make a 2% non-elective contribution for all eligible employees
The SIMPLE IRA has lower limits than a 401(k) or SEP-IRA but is easier and cheaper to administer. It's a middle ground for small businesses that want to offer retirement benefits without the complexity of a full 401(k) plan.
Defined Benefit Plan (Pension)
For high-income business owners, a defined benefit plan (essentially a personal pension) can allow contributions far exceeding the $70,000 limit of defined contribution plans.
Depending on your age and income, contributions can range from $100,000 to over $300,000 per year — all tax-deductible. The contribution is based on an actuarial calculation of what's needed to fund a specific retirement benefit.
This is an advanced strategy with high setup and administration costs (actuarial calculations required annually). It makes sense for business owners with very high income ($300,000+) who want to shelter as much as possible from taxes and are within 10-15 years of retirement.
A CPA and actuarial firm work together to implement this.
The Health Savings Account (HSA): The Best Tax-Advantaged Account
The HSA isn't technically a retirement account, but it's arguably the best tax-advantaged savings vehicle in the entire tax code.
Triple tax advantage:
- Tax-deductible contributions (reduces your taxable income)
- Tax-free growth (no tax on investment earnings)
- Tax-free withdrawals for qualified medical expenses
No other account offers all three. Traditional retirement accounts give you #1 and #2 but not #3. Roth accounts give you #2 and #3 but not #1.
2026 contribution limits:
- Individual coverage: approximately $4,300
- Family coverage: approximately $8,550
- Catch-up (age 55+): additional $1,000
Eligibility: You must have a High Deductible Health Plan (HDHP) and no other non-HDHP coverage.
The retirement strategy with HSAs:
Pay current medical expenses out of pocket (if you can afford to) and let the HSA grow invested for decades. After age 65, you can withdraw HSA funds for any purpose — if used for non-medical expenses, you pay income tax (no penalty). This makes it function like a Traditional IRA. If used for medical expenses, it's completely tax-free.
Given that healthcare is one of the largest expenses in retirement, having a substantial HSA balance provides both tax-free income and security.
Even if you use the HSA for current medical expenses, you're still paying those expenses with pre-tax dollars — saving your marginal tax rate on every dollar.
If you're eligible for an HSA, max it out every year. This is almost universally the right move.
Advanced Strategies
Backdoor Roth IRA
If your income exceeds Roth IRA limits, you can still get money into a Roth through the "backdoor":
Step 1: Contribute to a non-deductible Traditional IRA ($7,000) Step 2: Convert the Traditional IRA to a Roth IRA (immediately or shortly after) Step 3: Pay tax on any gains between contribution and conversion (usually minimal if done quickly)
The result: $7,000 in your Roth IRA, growing tax-free forever, despite earning too much for direct Roth contributions.
Important caveat — the pro-rata rule: If you have existing pre-tax money in any Traditional IRA, the conversion is taxed proportionally across all your Traditional IRA balances. For example, if you have $93,000 in pre-tax Traditional IRA money and add $7,000 in non-deductible contributions, only 7% of your conversion is tax-free. The other 93% is taxable.
The solution: Roll existing Traditional IRA balances into your employer's 401(k) before doing the backdoor Roth. This removes the pre-tax IRA money from the pro-rata calculation.
Mega Backdoor Roth
If your employer's 401(k) allows after-tax contributions (beyond the $23,500 pre-tax/Roth limit) and in-plan Roth conversions, you can contribute up to the total 401(k) limit ($70,000 including employer match) and convert the after-tax portion to Roth.
This can put $30,000-$40,000+ into Roth status annually — far more than the $7,000 Roth IRA limit. Not all plans allow this, so check with your HR department.
Roth Conversion Ladder
In years when your income is unusually low — between jobs, early retirement, sabbatical, starting a business — convert Traditional IRA or 401(k) money to Roth.
You'll pay tax at your current low rate, and the money then grows and withdraws tax-free forever. Converting $50,000 at the 12% bracket costs $6,000 in taxes. That same $50,000 withdrawn from a Traditional account at the 24% bracket in retirement would cost $12,000. The conversion saves $6,000.
Spousal IRA
If one spouse doesn't work (or earns very little), the working spouse can fund an IRA for the non-working spouse. The contribution limit is the same ($7,000 or $8,000 if 50+). This allows a married couple to contribute $14,000-$16,000 to IRAs even if only one spouse has earned income.
After-Tax 401(k) Contributions for Roth Conversion
Some 401(k) plans allow after-tax (non-Roth) contributions above the $23,500 employee limit. When combined with employer matching, this can push total contributions toward the $70,000 cap. These after-tax contributions can then be converted to Roth — either in-plan or by rolling to a Roth IRA upon separation from the employer.
Building Your Retirement Account Strategy by Income Level
Under $50,000 income:
- Contribute enough to 401(k) to get full employer match
- Max out Roth IRA ($7,000) — you're in a low bracket, so tax-free growth is more valuable than a deduction
- If eligible, contribute to HSA
- If self-employed, consider a Solo 401(k) with Roth contributions
$50,000-$150,000 income:
- Max out employer 401(k) ($23,500) — Traditional or Roth depending on your bracket and expectations
- Max out HSA if eligible
- Max out Roth IRA (or backdoor Roth if above income limits)
- If self-employed, max out Solo 401(k) or SEP-IRA
$150,000-$300,000 income:
- Max out employer 401(k) ($23,500)
- Max out HSA
- Backdoor Roth IRA ($7,000)
- Mega backdoor Roth if available
- If self-employed, max out Solo 401(k) with both employee and employer contributions
- Consider after-tax 401(k) contributions
$300,000+ income:
- All of the above
- Consider a defined benefit plan (if self-employed) for additional $100,000-$300,000+ in deductions
- Work with a CPA on advanced strategies — Roth conversion planning, charitable giving coordination, and multi-year tax projection
- Consider cash balance plans combined with 401(k)
Common Mistakes
Contributing to a Traditional IRA when Roth makes more sense. If you're in the 12% bracket, the Traditional IRA deduction saves $840 on a $7,000 contribution. But that $7,000 in a Roth, growing for 30 years, could mean $30,000-$50,000 in completely tax-free income. The Roth usually wins at low brackets.
Not contributing enough to get the full employer match. This is literally turning down free money. If your employer matches 50% up to 6% of salary, and you contribute 3%, you're leaving 1.5% of your salary on the table every year.
Not knowing about the Solo 401(k). Many self-employed people only know about IRAs and miss the opportunity to shelter $35,000-$70,000 per year.
Ignoring the HSA. People who are eligible for an HSA and don't use it are missing the only triple-tax-advantaged account in the tax code.
Cashing out retirement accounts when changing jobs. Rolling a 401(k) to an IRA or new employer's plan preserves the tax benefits. Cashing out triggers income tax on the full amount plus a 10% early withdrawal penalty if under 59.5. A $100,000 cash-out at the 24% bracket costs $34,000 in taxes and penalties.
Not considering the pro-rata rule before doing a backdoor Roth. If you have existing Traditional IRA balances, a backdoor Roth conversion can trigger unexpected taxes. Roll Traditional IRA money into a 401(k) first.
Waiting to start. The power of retirement accounts comes from decades of tax-advantaged compounding. $7,000 contributed at age 25 is worth far more than $7,000 contributed at age 55. Starting early — even with small amounts — makes an enormous difference.
Why a CPA Matters for Retirement Planning
A CPA integrates your retirement account strategy with your complete tax picture:
Roth vs. Traditional optimization. Based on your current bracket, expected future bracket, state taxes, and retirement timeline, a CPA determines the optimal split between tax-deferred and tax-free contributions.
Self-employed plan selection. Solo 401(k) vs. SEP-IRA vs. SIMPLE IRA vs. defined benefit plan — the right choice depends on your income, age, employees, and how much you want to shelter.
Multi-year planning. A CPA models your tax situation across multiple years to identify the best timing for Roth conversions, catch-up contributions, and distribution strategies.
Coordination with other strategies. Retirement contributions interact with the QBI deduction, S-Corp salary optimization, estimated quarterly payments, and charitable giving strategies. A CPA sees the complete picture.
The amount of money at stake is enormous. Over a 30-year career, the difference between a well-optimized retirement strategy and a basic one can be hundreds of thousands of dollars in tax savings and additional wealth.
Find a CPA who specializes in retirement tax planning at ListMyCpa.com. Search by state and specialization to find someone who can build a retirement strategy tailored to your income, business structure, and goals.