401(k) Contribution Calculator

Use this calculator to work out the per-paycheck 401(k) contribution needed to reach an annual savings target.

What this calculator does

The 401(k) contribution calculator converts an annual target or salary percentage into a paycheck contribution amount. It also accounts for year-to-date contributions and remaining pay periods.

It uses:

• annual salary
• contribution target or percentage
• pay frequency
• year-to-date contributions

401(k) Contribution Formula

Per-Paycheck Contribution = (Annual Target - YTD Contributions) ÷ Remaining Pay Periods

Where:

• Annual Target = desired contribution for the year
• YTD Contributions = amount already contributed
• Remaining Pay Periods = paychecks left this year
• Contribution % = annual contribution ÷ salary

Example calculation

If:

• Annual target = 23,500
• Already contributed = 5,000
• Pay periods remaining = 20
• Salary = 100,000

Then:

• Remaining contribution = 18,500
• Per-paycheck amount = 18,500 ÷ 20
• Per-paycheck amount = 925
• Contribution rate = 23.5%

The required paycheck contribution is 925.

What is a 401(k) contribution?

A 401(k) contribution is the portion of pay directed into a workplace retirement account. It may be pre-tax, Roth, or after-tax depending on plan options.

Why 401(k) contribution planning matters

• helps reach annual contribution targets
• prevents under-saving late in the year
• supports payroll planning
• helps avoid exceeding limits

When to use this calculator

• setting paycheck deductions
• catching up after low early-year contributions
• comparing contribution percentages
• planning around IRS limits

Common mistakes

• forgetting year-to-date contributions
• using annual periods instead of remaining periods
• missing employer match rules
• contributing too much too late

401(k) contribution vs employer match

Your contribution is money from your pay. Employer match is extra money added by your employer under plan rules.

Both count toward retirement growth, but they are calculated separately.

FAQs

What is a 401(k) contribution?

A 401(k) contribution is pay deferred into a workplace retirement account.

How do you calculate a 401(k) contribution?

Subtract year-to-date contributions from the annual target, then divide by remaining pay periods.

What is a good 401(k) contribution rate?

A good rate captures the full employer match and supports your retirement target.

What is the difference between contribution and match?

Contribution comes from your pay. Match comes from your employer.