What is the key difference between a Traditional IRA and a Roth IRA?

The fundamental difference lies in tax timing. Traditional IRAs offer upfront tax-deductible contributions with taxes deferred until distributions are taken in retirement as ordinary income. Roth IRAs are funded with after-tax dollars, but all future qualified withdrawals of contributions and investment growth are 100% tax-free.

What are the 2024 and 2025 IRA contribution limits?

For 2024 and 2025, the combined annual contribution limit for Traditional and Roth IRAs is $7,000 for individuals under age 50, with an additional $1,000 catch-up contribution permitted for individuals aged 50 and older (total $8,000). SEP IRA contribution limits allow up to 25% of compensation or $69,000 (2024) / $70,000 (2025).

What is tax drag on a regular taxable savings or brokerage account?

Tax drag is the compounding reduction in net returns caused by annual taxation of dividends, realized capital gains, and interest in taxable brokerage accounts. In an IRA, compounding proceeds unimpeded because taxes are not assessed each calendar year.

When do Required Minimum Distributions (RMDs) start for Traditional IRAs?

Under the SECURE 2.0 Act, Required Minimum Distributions (RMDs) for Traditional, SEP, and SIMPLE IRAs begin at age 73 (and will increase to age 75 in 2033). Roth IRAs have no RMDs during the original owner's lifetime.

How does fraction arithmetic help optimize retirement asset allocation?

Fraction arithmetic allows investors to determine exact portfolio weightings—such as allocating 1/3 to tax-free Roth growth, 1/2 to pre-tax Traditional IRAs, and 1/6 to liquid taxable brokerage—preventing rounding distortions across multi-account asset location strategies.

IRA Calculator - Compare Traditional vs. Roth vs. SEP vs. Taxable

Current balance	$
Annual before tax contribution ?	$
Expected rate of return ?	%
Current age
Retirement age
Current marginal tax rate ?	%
Expected tax rate in retirement ?	%

Result

	Traditional, SIMPLE, or SEP IRA	Roth IRA	Regular Taxable Savings
Balance at age 65	$1,066,343	$799,758	$563,434
Balance at age 65 (after tax)	$906,392	$799,758	$563,434

A Traditional, SIMPLE, or SEP IRA account can accumulate $106,634 more after-tax balance than a Roth IRA account at age 65. A Roth IRA account can accumulate $236,324 more than a regular taxable savings account.

Balance Accumulation Graph

Traditional/SIMPLE/SEP IRA (before tax)

Traditional/SIMPLE/SEP IRA (after tax)

Roth IRA (after tax)

Regular taxable savings (after tax)

Principal

Annual Schedule

Age	Traditional/SIMPLE/SEP IRA (Before Tax)		Traditional, SIMPLE, or SEP IRA (After Tax)		Roth IRA (After Tax)		Regular Taxable Savings (After Tax)
Age	Start	End	Start	End	Start	End	Start	End

Fraction Arithmetic & IRA Asset Allocation Calculator

Calculate exact fractional asset allocations across Traditional, Roth, SEP IRA, and taxable accounts using precise fraction arithmetic (+, −, ×, ÷).

Decimal Equivalent: 0.5833 (58.33%)

Step-by-Step Calculation: (1×4 + 1×3) / (3×4) = 7/12 → Simplified: 7/12

Asset Allocation Ratio: Represents the precise proportion allocated to the target asset class (e.g. 7/12 = 58.33% in tax-sheltered IRA vs 41.67% in taxable).

Understanding Individual Retirement Accounts (IRAs)

An Individual Retirement Account (IRA) is one of the most powerful wealth-accumulation tools available under the United States Internal Revenue Code. By providing tax advantages that shield investment growth from annual capital gains taxes, dividend taxes, and ordinary income taxation, IRAs allow individuals to compound their nest eggs far more efficiently than standard taxable brokerage accounts.

Traditional IRA vs. Roth IRA: Tax Deduction vs. Tax-Free Withdrawals

The central decision for most retirement savers is choosing between a Traditional IRA and a Roth IRA:

Traditional IRA: Contributions are typically tax-deductible in the year they are made, lowering your adjusted gross income (AGI) immediately. The capital grows tax-deferred over your career. Upon reaching retirement (minimum age 59½), withdrawals are taxed as ordinary income at your future marginal income tax rate. If your tax bracket is expected to be lower in retirement than it is today, a Traditional IRA typically delivers higher after-tax wealth.
Roth IRA: Contributions are made using after-tax earnings with no immediate deduction. In exchange, all future investment returns, capital appreciation, and qualified distributions taken in retirement are 100% tax-free. Roth accounts also have no lifetime Required Minimum Distributions (RMDs), making them exceptional vehicles for multi-generational estate planning.

Understanding the Cost of "Tax Drag" on Regular Savings

In a standard non-retirement brokerage account, every interest payment, stock dividend, and capital gain realized through portfolio rebalancing triggers an immediate tax liability in the current year. This annual friction is known as tax drag. Over 20, 30, or 40 years of compounding, tax drag significantly erodes total net growth. As shown in the comparison table above, an identical annual investment can accumulate hundreds of thousands of dollars more inside an IRA than in an ordinary taxable savings account, even after all retirement taxes are paid.

SEP and SIMPLE IRAs for Self-Employed and Small Business Owners

Entrepreneurs, freelancers, and small business employees can access expanded contribution ceilings through employer-sponsored IRA plans:

SEP IRA (Simplified Employee Pension): Enables self-employed professionals and small businesses to contribute up to 25% of net self-employment earnings, up to $69,000 in 2024 ($70,000 in 2025). Contributions are fully tax-deductible.
SIMPLE IRA (Savings Incentive Match Plan for Employees): Designed for businesses with fewer than 100 employees, allowing employee salary deferrals up to $16,000 in 2024 ($16,500 in 2025), plus catch-up additions and mandatory employer matching.

Retirement Accounts Comparison Matrix

Account Type	Upfront Tax Benefit	Tax on Growth	Withdrawal Taxation	RMD Requirement
Traditional IRA	Tax-deductible (income limits apply)	Tax-deferred	Taxed as ordinary income	Yes (age 73)
Roth IRA	None (funded with after-tax dollars)	Tax-free	100% tax-free in retirement	No lifetime RMDs
SEP IRA	Pre-tax employer deduction (up to $69k+)	Tax-deferred	Taxed as ordinary income	Yes (age 73)
Regular Taxable	None	Taxed annually (dividends/gains)	Tax-free capital return; gains taxed	No RMDs

Frequently Asked Questions (FAQ)

How much can I contribute to an IRA in 2024 and 2025? ▼

For tax years 2024 and 2025, the maximum total contribution limit across all Traditional and Roth IRAs is $7,000 for individuals under age 50. Individuals aged 50 or older can contribute an additional $1,000 catch-up contribution, raising their maximum limit to $8,000 per year.

Can I contribute to both a 401(k) and an IRA in the same calendar year? ▼

Yes, you can contribute to both an employer-sponsored 401(k) and an individual IRA in the same year. However, if you or your spouse are covered by a workplace retirement plan, your ability to deduct Traditional IRA contributions phases out at higher Modified Adjusted Gross Income (MAGI) thresholds. Roth IRA contributions are subject to their own separate income phase-out limits.

What happens if I withdraw money from my Traditional IRA before age 59½? ▼

Non-qualified early withdrawals from a Traditional IRA are generally subject to regular income taxes plus a 10% IRS early distribution penalty. Exceptions include qualified higher education expenses, up to $10,000 for first-time homebuyer acquisition, certain unreimbursed medical expenses, and disability.

Why does fraction arithmetic matter for multi-account retirement strategies? ▼

Sophisticated retirement investors use "tax location" strategies, placing tax-inefficient assets (like high-yield bonds and REITs) in Traditional or Roth IRAs and tax-efficient index funds in taxable accounts. Fraction arithmetic prevents rounding loss when splitting deposits into exact proportions (such as 1/3, 1/4, or 5/12).