Roth IRA Calculator

The IRS adjusts Roth IRA contribution limits annually based on inflation. The 2024 limits (per IRS Revenue Procedure 2023-34) allow maximum contributions of $7,000 for individuals under 50 and $8,000 for those 50 and older (the $1,000 catch-up provision).

2024 Income Phase-Out Ranges

Unlike Traditional IRAs, Roth IRA contributions are restricted by income — the contribution limit gradually phases out as your Modified Adjusted Gross Income (MAGI) increases:

The Backdoor Roth Strategy

High-income earners above the phase-out can still fund a Roth IRA using the 'backdoor' strategy: contribute to a non-deductible Traditional IRA, then immediately convert to a Roth. The IRS confirmed this is legal in Notice 2023-43. However, the 'pro-rata rule' in IRC Section 408(d)(2) complicates this if you have existing pre-tax IRA balances — a portion of the conversion becomes taxable based on the ratio of pre-tax to after-tax funds across ALL your Traditional IRAs.

The true power of a Roth IRA lies in compound growth within a tax-free envelope. Because no taxes are ever owed on gains, the compound effect is significantly amplified compared to taxable accounts where annual taxes on dividends and capital gains create drag.

Monthly Contribution Growth Scenarios

Using the S&P 500's historical average annual return of 10.13% (1957–2023, per NYU Stern's Damodaran data), here's what regular Roth IRA contributions grow to:

Assumes 10% average annual return. Actual returns vary; use 7% for more conservative estimates.

$100 a Month in a Roth IRA for 30 Years

Contributing just $100 per month — $1,200 per year — to a Roth IRA for 30 years results in $36,000 in total contributions. At a 10% average return, the account grows to approximately $206,552. At a more conservative 7%: $121,997. The $170,552 in growth (at 10%) is entirely tax-free. In a taxable account at the same return, assuming a 15% capital gains rate, you'd owe approximately $25,583 in taxes, netting only $180,969. The Roth IRA advantage: $25,583 in permanent tax savings on just $100/month.

The Roth vs Traditional decision is the most debated topic in personal finance. The fundamental question: is it better to pay taxes now (Roth) or later (Traditional)? The answer depends on your current tax bracket, expected future bracket, and investment horizon.

The Tax Math Comparison

Consider a 30-year-old contributing $7,000/year for 35 years at 8% returns:

The Roth wins if tax rates are equal or higher in retirement. Traditional wins if rates drop significantly.

When Traditional IRA Wins

William Bernstein (Efficient Frontier author) and Larry Swedroe (index investing researcher) argue that Traditional wins for high earners in the 32%+ tax bracket who expect to retire in the 22-24% bracket. The tax deduction today at 32% saves more than the future tax at 22%. However, T. Rowe Price modeling shows this advantage erodes if tax rates increase — a plausible scenario given rising national debt (Congressional Budget Office projects higher rates may be necessary) and the TCJA provisions sunsetting after 2025.

The SECURE 2.0 Act Changes

The SECURE 2.0 Act (December 2022) introduced several Roth-friendly provisions: employer 401(k) matches can now be deposited as Roth contributions, SEP and SIMPLE IRAs now accept Roth contributions, and beginning in 2024, RMDs are no longer required for Roth 401(k) accounts. These changes, per the Joint Committee on Taxation, expand Roth access for millions of additional retirement savers.

Contributions Can Always Be Withdrawn Tax and Penalty Free

One of the Roth IRA's unique advantages: you can withdraw your contributions (not earnings) at any time, for any reason, without taxes or penalties. This makes the Roth IRA a dual-purpose vehicle — retirement savings with an emergency fund component. According to Vanguard, approximately 3% of Roth IRA holders withdraw contributions before retirement, using this flexibility for home purchases or temporary financial hardship.

The 5-Year Rule for Earnings

To withdraw earnings tax-free, two conditions must be met per IRC Section 408A: (1) The account must have been open for at least 5 tax years (the 'seasoning' period), AND (2) you must be 59½ or older, permanently disabled, or withdrawing up to $10,000 for a first home. The 5-year clock starts January 1 of the tax year you make your first Roth contribution — so a contribution on April 15, 2025 (for tax year 2024) starts the clock on January 1, 2024.

The 5-Year Rule for Conversions

Each Roth conversion has its own 5-year waiting period before penalty-free withdrawal — a critical distinction for backdoor Roth and mega backdoor strategies. This rule exists to prevent the 'conversion loophole' of converting pre-tax funds and immediately withdrawing them penalty-free. After 5 years OR age 59½ (whichever comes first), the converted amount is freely accessible.

The Mega Backdoor Roth

If your 401(k) plan allows after-tax contributions and in-service withdrawals (approximately 40% of large employer plans do, per Vanguard's How America Saves), you can contribute beyond the $23,000 pre-tax limit — up to the IRS Section 415(c) limit of $69,000 total (including employer match) — then convert the after-tax portion to a Roth IRA. This 'mega backdoor' can funnel an additional $30,000–$46,000 annually into Roth accounts. Fidelity reports that mega backdoor Roth adoption increased 35% in 2023.

Roth Conversion Ladder

Early retirees use a 'Roth conversion ladder' to access Traditional IRA/401(k) funds before 59½ without penalty: convert a year's worth of expenses from Traditional to Roth, pay income tax on the conversion, then wait 5 years for penalty-free withdrawal. By converting each year, you create a 'ladder' where converted amounts become available sequentially. The Mad Fientist (early retirement researcher) popularized this strategy, showing it can reduce lifetime taxes by 30–50% compared to standard RMD-based withdrawals.

Roth IRA for Estate Planning

Roth IRAs have no Required Minimum Distributions during the owner's lifetime (confirmed post-SECURE 2.0), allowing the account to grow tax-free indefinitely. While non-spouse beneficiaries must empty inherited Roth IRAs within 10 years (SECURE Act of 2019), withdrawals remain tax-free. Ed Slott (IRA expert, author of 'The New Retirement Savings Time Bomb') calls the Roth IRA 'the single greatest gift you can leave your heirs' because they inherit wealth completely free of income tax.