Current-year tax lift
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The U.S. 2026 limits below stay disabled for review but are source-backed for planning.
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Use Standard unless your employer confirms the plan qualifies for the higher applicable SIMPLE limit.
This affects deductible traditional IRA savings only; Roth IRA eligibility uses its own MAGI phaseout.
Use the status expected on the return for this contribution year.
Used only for contribution limits and catch-up rules.
years
For IRA phaseouts, use MAGI before the IRA deduction. For workplace plans, use eligible annual compensation.
$
Enter the annual amount still being planned, not including employer match.
$
Include employee deferrals or IRA contributions that share the same annual limit.
$
The limit is still capped by annual compensation in the result.
$
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This replaces the standard deduction in the federal bracket comparison.
$
Applied only to the deductible or pre-tax amount.
%
This rate is manual because state retirement contribution treatment varies.
%
Choose Eligible only when age, student, dependent, and recent distribution rules are satisfied.
Pick the formula closest to the plan; Custom exposes a flat match percentage and salary cap.
Example: 50 means the employer adds 50 cents per dollar contributed.
%
Example: 6 means matching stops after employee contributions reach 6% of compensation.
% of pay
Use 26 for biweekly, 24 for semimonthly, 12 for monthly, or the actual remaining payroll count.
periods
Enter 0 if the rule is not relevant or your plan has not confirmed the prior-year wage test.
$
Default keeps payroll tax savings at zero for ordinary retirement deferrals.
The limit table shows both gross and vested match value.
%
This is a planning scenario, not an investment return guarantee.
years
Set 0% for a contribution-only projection.
%
Tax metric Amount Basis Copy
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Retirement contribution tax savings are the current-year tax benefit from putting eligible money into a retirement account. Pre-tax workplace deferrals and deductible traditional IRA contributions can reduce taxable income now, while Roth and after-tax contributions usually do not create a current income-tax deduction.

The contribution limit is only the first constraint. Age-based catch-up rules, IRA income phaseouts, payroll-tax treatment, the Saver's Credit, and employer match formulas can all change the real out-of-pocket cost. Two people contributing the same dollar amount can see different tax benefits because their filing status, taxable income, match formula, and plan type differ.

Retirement contribution flow from planned amount through limit check, tax benefit, net cost, employer match, and future-value path

Current tax savings are useful for paycheck planning, but they are not the same as total retirement value. A Roth contribution may show no current deduction and still be attractive for future tax treatment. A pre-tax contribution may lower current income tax while creating taxable retirement income later. Employer match can outweigh the current tax effect when a contribution captures money that would otherwise be left on the table.

A good estimate keeps the time frame clear. It answers how a stated 2026 contribution changes current federal income tax, optional state/local tax, optional payroll tax, Saver's Credit, employer match, and a simple repeated-contribution projection. It does not decide final tax filing, plan eligibility, vesting rights, investment performance, or state-specific retirement rules.

How to Use This Tool:

Start with the account and contribution being planned, then add the tax and employer assumptions that apply to the same tax year.

  1. Choose Retirement account and Tax treatment. Workplace plans, SIMPLE plans, IRAs, and manual limits use different 2026 contribution limits, catch-up rules, match eligibility, and phaseout checks.
  2. Enter Filing status, Age at year end, Annual compensation or MAGI before this contribution, Planned employee contribution, and Already contributed this year. The summary and Limit & Match tab show whether the planned amount is within the selected remaining limit.
  3. For IRA runs, set IRA workplace coverage. Traditional IRA deductibility can phase out when the contributor or spouse is covered by a workplace plan, and Roth IRA eligibility uses a separate MAGI phaseout.
  4. Select a Federal tax method. The 2026 bracket methods compare federal tax before and after the deductible amount, while Manual marginal federal rate applies the entered rate directly to the deductible amount.
  5. Add a verified State or local marginal rate only if the contribution is treated as deductible for that jurisdiction. Leave it at 0 for a federal-only estimate or when state rules are unknown.
  6. Set Saver's Credit status and, for match-eligible plans, choose an Employer match formula. Open Advanced for pay periods remaining, prior-year FICA wages for the Roth catch-up rule, payroll-tax treatment, vesting percentage, projection years, and annual return assumption.
  7. Read Tax Shield first, then check Paycheck Impact, Limit & Match, Annual Value Bridge, Savings Path, Source Notes, and JSON if you need an audit trail or exportable scenario.

If the result shows a capped contribution, phaseout, no current deduction, match left on table, or Roth catch-up warning, fix the named input before treating the estimate as a planning number. The calculator caps out-of-range contribution amounts rather than letting excess dollars create tax savings.

Interpreting Results:

Total tax-year benefit combines modeled federal income-tax savings, optional state/local tax savings, optional payroll-tax savings, and the Saver's Credit. Read it with Allowed employee contribution and Deductible or pre-tax amount, because over-limit dollars, Roth treatment, after-tax treatment, IRA phaseouts, or forced Roth catch-up treatment can reduce the part that receives a current deduction.

Net tax-year cost is the allowed employee contribution minus the modeled tax benefit. It is a tax-year planning figure, not a guarantee of paycheck withholding. The Paycheck Impact tab separates current withholding tax shield from the Saver's Credit, because the credit is normally realized on the tax return rather than in each paycheck.

Employer match should be checked before focusing only on tax savings. A contribution can have a modest current tax benefit but still be valuable when it captures a plan match. The match rows show modeled gross match, vested match, match left on table, and the contribution needed to capture the modeled full match.

When the estimate looks surprising, verify the filing status, income or MAGI, IRA workplace coverage, already-contributed amount, pay periods remaining, state/local rate, match formula, vesting percentage, and whether the payroll-tax switch should stay off for ordinary retirement deferrals.

Technical Details:

The calculation begins with the annual contribution limit, not the tax rate. A 2026 workplace elective deferral, SIMPLE contribution, IRA contribution, or manual plan limit is first capped by the selected statutory limit and by the compensation value entered for the year. Already-contributed dollars reduce the remaining room before the planned contribution is allowed into the tax calculation.

Tax treatment controls how much of the allowed contribution creates a current tax benefit. Pre-tax workplace deferrals and deductible traditional IRA contributions can reduce the federal income-tax base. Roth and after-tax non-Roth contributions are treated as producing no current income-tax deduction, although they can still interact with employer match and the Saver's Credit.

Formula Core

Allowed contribution = min ( planned contribution , max ( 0 , compensation-capped limit - already contributed ) )
Total tax-year benefit = federal savings+state/local savings+payroll-tax savings+Saver's Credit Future value = A⁢(1+r)n-1r
Account profile Base employee limit Age 50+ catch-up Special 2026 rule modeled
401(k), 403(b), governmental 457, or TSP $24,500 $8,000, or $11,250 at ages 60 to 63 Section 415 annual additions check uses $72,000; prior-year FICA wages above $150,000 can force catch-up dollars to Roth treatment.
SIMPLE IRA or SIMPLE 401(k) $17,000 standard, or $18,100 for applicable higher SIMPLE plans $4,000 standard, $3,850 for applicable higher SIMPLE plans, or $5,250 at ages 60 to 63 Use the applicable higher SIMPLE option only when the employer confirms that the plan qualifies.
IRA annual limit $7,500 $1,100 Traditional IRA deduction and Roth IRA contribution eligibility can be reduced by MAGI phaseouts.
Manual retirement plan limit User-entered $0 unless included in the manual limit Still capped by annual compensation in the result.

For pre-tax runs, the deductible amount is the allowed contribution after any forced Roth catch-up amount and IRA deduction phaseout. A covered traditional IRA contributor phases out from full deduction to no deduction over the applicable MAGI range. Roth IRA runs use the Roth contribution phaseout to cap how much of the IRA limit remains eligible, but they still produce no current deduction in this calculator.

Quantity Formula or rule Interpretation
Deductible amount Pre-tax eligible amount after forced Roth catch-up treatment, multiplied by any IRA deduction fraction; otherwise zero. Only this portion is allowed to reduce current income-taxable income.
Federal tax savings, bracket method Progressive federal tax before the deductible amount minus progressive federal tax after the deductible amount. Uses 2026 federal brackets and the selected standard or custom deduction base.
Federal tax savings, manual method Deductible amount multiplied by the manual federal marginal rate. Useful when the user's verified next-dollar federal rate is better than the bracket model.
State/local savings Deductible amount multiplied by the state or local marginal rate. State treatment is user-entered because jurisdictions can treat retirement contributions differently.
Payroll-tax savings Payroll tax before the deductible amount minus payroll tax after the deductible amount, only when that treatment is enabled. The default is zero for ordinary retirement deferrals, which generally do not reduce Social Security or Medicare wages.
Total tax-year benefit Federal savings, state or local savings, payroll-tax savings, and Saver's Credit added together. Feeds the headline tax benefit and net cost.

The 2026 federal bracket option computes progressive tax before and after the deductible amount. The bracket thresholds and standard deductions are tied to filing status. The manual federal rate option bypasses bracket recomputation, so the user is responsible for entering a rate that matches their own marginal situation.

Rule area 2026 value used Where it affects the estimate
Standard deduction $16,100 single or married filing separately; $32,200 married filing jointly; $24,150 head of household Bracket method taxable income before and after the deductible amount.
Ordinary federal brackets 10%, 12%, 22%, 24%, 32%, 35%, and 37% schedules by filing status Progressive federal tax comparison.
Social Security tax 6.2% employee rate up to the $184,500 wage base Only used if the payroll-tax switch treats the contribution as reducing FICA wages.
Medicare tax 1.45% employee rate on all covered wages Only used if the payroll-tax switch is enabled.
Additional Medicare tax 0.9% above $200,000 single or head of household, $250,000 married filing jointly, or $125,000 married filing separately Optional payroll-tax before-and-after comparison.

The Saver's Credit is modeled as a separate credit rather than a deduction. The credit rate comes from the 2026 adjusted gross income thresholds after subtracting the deductible amount, then applies to up to $2,000 of qualified contributions, or $4,000 for married filing jointly. When the bracket method is used, the modeled credit is limited by the post-contribution federal income tax calculated in the run.

Credit rate Married filing jointly AGI up to Head of household AGI up to Single or married filing separately AGI up to
50%$48,500$36,375$24,250
20%$52,500$39,375$26,250
10%$80,500$60,375$40,250
0%Above $80,500Above $60,375Above $40,250

Employer match formulas are treated as planning approximations. The common formulas model 100% up to 3% of pay, 50% up to 6% of pay, and a safe harbor style 100% on the first 3% plus 50% on the next 2%. Custom match applies a user-entered match percentage to contributions up to a user-entered percentage of pay, then multiplies by the vesting percentage for planning value.

The growth projection uses the future value of a repeated annual payment. For each year, employee contributions, vested employer match, and saved tax benefits are projected separately with the future-value formula above, or simple payment times years when the return assumption is 0%. The projection assumes the same annual values repeat and does not model salary growth, changing limits, investment volatility, fees, taxes in retirement, required minimum distributions, or plan-specific true-up rules.

Limitations, Privacy, and Accuracy:

This is an educational U.S. federal planning estimate for 2026 assumptions. It is not tax, legal, payroll, investment, benefits, or filing advice. Personal facts, plan documents, state law, payroll coding, timing, rounding, vesting, eligibility, and IRS guidance can change the final answer.

  • State and local treatment is not looked up. The state/local rate is the user's manual assumption and should be verified separately.
  • IRA phaseout inputs use the income field as MAGI before the contribution. Actual MAGI can differ from wages or compensation.
  • Employer match estimates do not replace plan documents, true-up provisions, eligibility rules, vesting schedules, or payroll timing.
  • Ordinary retirement deferrals default to no Social Security or Medicare wage reduction. Turn on payroll-tax reduction only for an arrangement where that treatment is verified.
  • Entries are processed in the browser session. Exported CSV, DOCX, chart, or JSON files can still contain sensitive income, contribution, tax, and employer-match assumptions.

Worked Examples:

Pre-tax 401(k) contribution with match

A single employee age 42 earns $125,000, plans an $18,000 pre-tax workplace contribution, has no prior employee contribution for the year, uses the 2026 federal bracket method with the standard deduction, enters a 5% state/local marginal rate, and selects a 50% match up to 6% of pay. The planned contribution is within the $24,500 base deferral limit. The estimate treats all $18,000 as deductible, recomputes federal tax before and after the deduction, adds the state/local savings, and models a $3,750 employer match because only the first $7,500 of employee contribution is matched at 50%.

IRA deduction phaseout

A single taxpayer age 50 with workplace coverage and $86,000 of MAGI enters an $8,600 traditional IRA contribution. The IRA limit is available by age and compensation, but deductibility is partly phased out between $81,000 and $91,000 for a covered single filer. The calculator allows the contribution amount but applies a 50% deduction fraction, so only $4,300 receives current federal and state/local deduction treatment.

Roth catch-up rule for a higher-wage worker

A 61-year-old workplace plan participant with $170,000 of prior-year FICA wages enters a $32,500 pre-tax contribution. The 2026 age 60 to 63 workplace limit allows a $24,500 base amount plus an $11,250 catch-up limit, so the contribution is within the selected limit. Because prior-year FICA wages exceed the $150,000 Roth catch-up threshold, the modeled catch-up slice above the base limit is forced out of the current deduction and appears in the strategy review.

FAQ:

Does a pre-tax retirement contribution always reduce my paycheck by the full contribution?

No. The gross contribution reduces pay, but current income-tax withholding may fall when the contribution is deductible or pre-tax. The Paycheck Impact tab estimates contribution per period, current withholding tax shield per period, and take-home reduction before any year-end Saver's Credit.

Why does a Roth contribution show no current deduction?

Roth contributions are made with after-tax dollars. They can still count for plan limits, employer match, and Saver's Credit modeling, but the calculator does not treat them as reducing current taxable income.

Which income number should I enter?

For workplace plans, use eligible annual compensation for the year. For IRA deduction, Roth IRA eligibility, and Saver's Credit checks, use MAGI before the contribution being modeled. If those numbers differ, run separate scenarios or use the value that matches the rule you are testing.

Why is payroll-tax savings zero by default?

Ordinary 401(k)-style elective deferrals commonly reduce federal income-taxable wages but not Social Security or Medicare wages. The payroll-tax switch is available only for cases where the user has verified that the contribution also reduces FICA wages.

Can I use the projection as an investment forecast?

Use it as a sensitivity scenario only. It repeats the same annual contribution, vested match, saved tax benefit, years, and return assumption. It does not model market volatility, changing salary, changing limits, fees, taxes on withdrawal, or plan-specific investment choices.

Glossary:

Allowed employee contribution
The part of the planned contribution that remains after the selected annual limit, compensation cap, already-contributed amount, and Roth IRA eligibility cap are applied.
Deductible amount
The part of the allowed contribution treated as reducing current income-taxable income for the estimate.
MAGI
Modified adjusted gross income, used here as the income basis for IRA phaseouts and Saver's Credit thresholds.
Catch-up contribution
An extra amount allowed for eligible savers who are age 50 or older, with higher 2026 limits for ages 60 to 63 in covered workplace and SIMPLE plans.
Forced Roth catch-up
The modeled workplace catch-up portion that is removed from pre-tax treatment when prior-year FICA wages with the plan sponsor exceed the 2026 Roth catch-up threshold.
Saver's Credit
A federal tax credit for eligible retirement contributions, subject to age, student, dependent, distribution, contribution, income, and tax-liability limits.
Vested employer match
The portion of modeled employer match counted as planning value after applying the entered vesting percentage.

References: