Retirement math · Free calculator

Roth vs Traditional 401(k) — Idaho

A traditional 401(k) lowers today's taxes; a Roth costs more now but is tax-free later. See the exact paycheck difference in Idaho at your salary and contribution.

Short answer

Roth vs Traditional 401(k) — Idaho

-$3,903Extra take-home with traditional (per year)

Contributing $6,000 traditionally in Idaho cuts this year's tax bill by about -$3,903. The same Roth contribution leaves your paycheck -$3,903 smaller but grows and withdraws tax-free.

How it's calculated: Traditional saves -$3,903 of tax now (-$150 per paycheck); Roth pays that tax now for tax-free withdrawals later Adjust the inputs below to recalculate for your own numbers.

Disclaimer: Educational estimate — not tax advice. Federal uses 2026 IRS brackets and standard deduction; FICA uses the 2026 $176,100 Social Security wage base. State figures use 2025–2026 resident schedules; credits and nonresident rules are not modeled. The comparison shows today's paycheck impact only; future tax rates and investment growth determine which wins long-term. 2026 employee deferral limit: $24,500.

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Annual salary ($)$75,000

Filing status (0 = single, 1 = married jointly)0

Annual contribution ($, 2026 limit $24,500)$6,000

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Paycheck take-home calculator Federal income tax calculator

Formula used

The trade

If your tax rate in retirement will be lower than today, traditional usually wins; if higher, Roth usually wins.

Traditional: tax break now, taxed at withdrawal. Roth: taxed now, tax-free at withdrawal.

2026 contribution limit

$24,500

Catch-up (50+)

+$8,000

Traditional break at $75k

~22–24¢/$

Roth withdrawal tax

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The paycheck difference

Traditional contributions come out before taxes, so each dollar costs you less than a dollar of take-home — at a 22% marginal rate, a $100 contribution costs about $78 of paycheck. Roth contributions are full-price today but never taxed again.

A simple decision rule

Early career or low bracket? Roth is often better — lock in today's low rate. Peak earning years? Traditional's break is worth more. Unsure? Split the contribution.

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FAQ

Does a 401(k) lower my paycheck a lot?

Less than you think — pre-tax contributions reduce your taxable income, so a $230 per-check contribution might only shrink take-home by about $180.

Can I do both Roth and traditional?

Yes — the $24,500 limit (2026) is combined, but you can split it between the two in any proportion.

Which is better in a no-income-tax state?

The state tax break for traditional contributions is smaller, which tilts the math slightly toward Roth — but the federal break usually dominates the decision.

Investing the difference instead? the Baby Steps investing calculator projects it out at Ramsey's assumptions.

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See our editorial policy and disclaimer. Results are estimates, not advice.

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