Tool vs Tool

Roth IRA Conversion Calculator vs 401(k) Calculator

Compare Roth IRA conversions with 401(k) contributions to optimize your retirement tax strategy. See which approach maximizes your long-term savings.

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Roth IRA Conversion Calculator

Analyze Roth IRA conversion strategies with break-even year calculation, tax impact analysis, and optimal conversion amount recommendations

Traditional IRA Balance ($)

Conversion Amount ($)

Amount to convert to Roth

Current Age

Retirement Age

Current Federal Tax Bracket

Expected Retirement Tax Bracket

Expected Annual Return (%)

State Tax Rate (%)

Pay conversion taxes from outside funds (recommended)

Net Benefit of Converting $50,000 to Roth IRA

+$26,394

Converting would leave you $26,394 better off at retirement (age 65).

Tax Cost Now

-$14,500

29.0% effective rate

With Conversion

$617,215

after-tax at retirement

Without Conversion

$564,974

after-tax at retirement

Break-Even Year

Year 1 (Age 46)

Scenario A: Keep Traditional

Starting Balance$200,000

Growth (20 yrs at 7%)$773,937

Taxes at withdrawal (27.0%)-$208,963

After-Tax Value$564,974

Scenario B: Convert $50,000 to Roth

Roth (tax-free at 65)$193,484

Remaining Traditional (after tax)$423,730

Tax cost of conversion (paid now)-$14,500

Opportunity cost of tax payment-$25,847

After-Tax Value$617,215

After-Tax Value Over Time: Traditional vs Roth Conversion

Traditional (after-tax)

With Roth Conversion (after-tax)

$0$387K$774K

Year-by-Year Comparison (20 years)

Year	Age	Traditional (pre-tax)	Traditional (after-tax)	Roth + Trad (after-tax)	Net Benefit
1break-even	46	$214,000	$156,220	$169,904	+$13,684
2	47	$228,980	$167,155	$181,049	+$13,894
3	48	$245,009	$178,856	$192,989	+$14,132
4	49	$262,159	$191,376	$205,779	+$14,402
5	50	$280,510	$204,773	$219,480	+$14,707
... 10 more years ...
16	61	$590,433	$431,016	$452,491	+$21,475
17	62	$631,763	$461,187	$483,726	+$22,539
18	63	$675,986	$493,470	$517,177	+$23,707
19	64	$723,306	$528,013	$553,002	+$24,989
20	65	$773,937	$564,974	$591,368	+$26,394

Optimal Conversion Amount Analysis

Net benefit of different conversion amounts with your current tax rates and time horizon.

$10,000+$5,279

Tax cost: $2,900 | After-tax total: $575,422

$25,000+$13,197

Tax cost: $7,250 | After-tax total: $591,094

$50,000current+$26,394

Tax cost: $14,500 | After-tax total: $617,215

$75,000+$39,591

Tax cost: $21,750 | After-tax total: $643,335

$100,000+$52,788

Tax cost: $29,000 | After-tax total: $669,455

$150,000+$79,182

Tax cost: $43,500 | After-tax total: $721,696

$200,000best+$105,575

Tax cost: $58,000 | After-tax total: $773,937

Key Considerations

Conversion Favored When

- Current tax rate lower than retirement rate
- Long time horizon (more tax-free growth)
- Can pay taxes from outside funds
- Want to eliminate RMDs at age 73+
- Estate planning (tax-free to heirs)

Traditional Favored When

- Current tax rate higher than retirement rate
- Short time horizon to retirement
- Must use IRA funds to pay conversion tax
- Conversion pushes you into higher bracket
- Need the funds before age 59.5

This calculator provides estimates for educational purposes only. It assumes constant tax rates and returns, which will vary in practice. Roth conversions may have additional implications for Medicare premiums (IRMAA), Social Security taxation, and state taxes. Consult a qualified tax advisor or financial planner before making conversion decisions.

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401(k) Calculator

Project your 401(k) retirement savings with employer matching, catch-up contributions, and growth analysis

Current Age

Retirement Age

Current Annual Salary ($)

Annual Salary Growth (%)

Your Contribution (%)

Employer Match (%)

Match Cap (% of salary)

Current 401(k) Balance ($)

Expected Annual Return (%)

Projected Balance at Age 65

$3,366,394

Monthly retirement income (4% rule): $11,221.31

Your Contributions

$759,087

Employer Match

$154,178

Investment Returns

$2,428,129

Starting Balance

$25,000

Balance Breakdown

Starting: 0.7%

Yours: 22.5%

Match: 4.6%

Returns: 72.1%

Traditional vs Roth 401(k)

Traditional 401(k)

Tax savings now$166,999

Marginal rate now22%

Est. retirement tax22%

Monthly after tax$8,752.62

Roth 401(k)

Tax cost now$166,999

Tax at withdrawal0%

Tax-free growthYes

Monthly after tax$11,221.31

Your current tax rate is at or below the estimated retirement rate. Roth 401(k) may provide greater long-term benefit. This is a simplified comparison. Consult a financial advisor for personalized advice.

Milestone Markers

$100K

Age 34

Year 4

$500K

Age 45

Year 15

$1M

Age 51

Year 21

$2M

Age 59

Year 29

"What If" Scenarios

+1% Contribution

+$156,270

15% to 16% = ~$70.83 less/mo take-home

+2% Annual Return

+$1,820,220

7.0% to 9.0% average return

Retire 2 Years Later

+$568,731

Age 65 to 67 = 2 more years of growth

Small changes compound significantly over 35+ years. These scenarios show the marginal impact of each change independently.

Growth Over Time

Contributions + Match

Investment Returns

$0$1.7M$3.4M

Year-by-Year Projection

Age	Salary	Contrib.	Match	Returns	Balance
31	$85,000	$12,750	$2,550	$2,286	$42,586
32	$87,550	$13,133	$2,627	$3,533	$61,877
33	$90,177	$13,526	$2,705	$4,900	$83,008
34	$92,882	$13,932	$2,786	$6,396	$106,123
35	$95,668	$14,350	$2,870	$8,031	$131,374
36	$98,538	$14,781	$2,956	$9,817	$158,928
37	$101,494	$15,224	$3,045	$11,764	$188,962
38	$104,539	$15,681	$3,136	$13,886	$221,665
39	$107,675	$16,151	$3,230	$16,195	$257,241
40	$110,906	$16,636	$3,327	$18,706	$295,910

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Detailed Comparison

The Roth IRA Conversion Calculator and the 401(k) Calculator address retirement savings from opposite tax perspectives. A Roth IRA conversion means paying income taxes now on pre-tax retirement funds so that all future growth and withdrawals are completely tax-free. The calculator models the tax hit today, projects your break-even year, and helps determine the optimal amount to convert in a given year based on your current tax bracket.

The 401(k) Calculator projects your retirement savings growth through tax-deferred contributions. Money goes in pre-tax, reducing your current taxable income, and grows without annual tax drag. You pay income tax only when you withdraw in retirement. The calculator factors in employer matching — often the single highest guaranteed return on any investment — and shows the dramatic effect of increasing your contribution rate by even one or two percentage points.

The core decision comes down to when you expect to pay lower taxes. If your tax rate today is lower than you expect in retirement (perhaps you are early in your career or in a temporarily low-income year), converting to Roth locks in the lower rate. If your current rate is high and you expect it to drop in retirement, maximizing 401(k) deferrals saves more money overall. Many financial planners recommend maintaining both account types for tax diversification flexibility.

When to Use Each Tool

When to Use Roth IRA Conversion Calculator

Use the Roth IRA Conversion Calculator when you are in a lower tax bracket now than you expect to be in retirement, when you want tax-free income in retirement, or when you are looking for a strategic partial conversion during a low-income year. It is especially powerful for early retirees who have a gap between leaving work and accessing Social Security.

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When to Use 401(k) Calculator

Use the 401(k) Calculator to project retirement savings with employer matching, see how increasing contributions accelerates growth, and determine whether you are on track for your target retirement age. It is essential for anyone with access to an employer-sponsored plan, especially when a company match is available.

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Our Verdict

Start with the 401(k) Calculator to ensure you are contributing enough to capture your full employer match — that is free money you should never leave on the table. Then use the Roth IRA Conversion Calculator to evaluate whether converting some pre-tax savings makes sense for your tax situation. Most people benefit from having both Roth and pre-tax retirement accounts.

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Roth IRA Conversion Calculator vs 401(k) Calculator