Roth 401k Fidelity Calculator

Calculator

Current age

Retirement age

Current Roth 401k balance

Current annual salary

Contribution type

Employee contribution percent

Employee fixed yearly amount

Employer match rate percent

Employer match cap percent of salary

Expected annual return percent

Annual salary growth percent

Current tax rate percent

Estimated retirement tax rate percent

Inflation rate percent

Optional yearly contribution cap

Years to contribute

Retirement withdrawal years

Example Data Table

Scenario	Age	Salary	Contribution	Match	Return
Starter saver	30	$55,000	8%	50% up to 6%	6%
Mid career saver	42	$85,000	12%	100% up to 4%	7%
Late planner	55	$110,000	$18,000	50% up to 5%	5%

Formula Used

Employee contribution: Salary × contribution percent, or fixed yearly amount.

Contribution cap: Employee contribution is limited by the optional yearly cap.

Employer match: Minimum of employee contribution and salary match cap × match rate.

Yearly ending balance: Opening balance plus employee contribution plus employer match, then grown by annual return.

Roth tax cost: Employee Roth contribution × current tax rate.

Retirement withdrawal estimate: Projected balance is converted into a yearly payment across selected retirement years.

How to Use This Calculator

Enter your current age, retirement age, balance, and salary. Choose whether your contribution is a salary percent or a fixed yearly amount. Add employer match details, growth assumptions, tax rates, and retirement years. Press calculate. Review the result above the form. Use CSV or PDF downloads to save your estimate.

Roth 401k Planning Guide

What This Calculator Shows

A Roth 401k can be a strong retirement tool. Contributions go in after tax. Qualified withdrawals can later be tax free. This calculator estimates how salary, savings rate, matches, and growth may shape your future balance. It also shows the current tax cost of Roth contributions. That helps you compare today’s sacrifice with tomorrow’s potential income.

Why Roth Contributions Matter

Roth contributions do not lower taxable income now. You pay income tax before money enters the account. The tradeoff is future flexibility. A larger tax free bucket can help manage retirement income, Medicare thresholds, and estate planning. The value depends on your tax rate now, your expected tax rate later, and your investment horizon.

How Employer Matches Affect Results

Employer matches can greatly improve long term growth. This tool lets you enter the match rate and match cap. A common plan may match part of your contribution up to a salary percentage. The calculator applies the cap each year. It then adds that matched amount to the projected balance. Some plans place matches in pretax accounts. Others may allow Roth treatment. Check your plan documents.

Using Fidelity Style Inputs

Many savers review retirement numbers through a Fidelity account or workplace plan screen. This calculator follows a similar planning flow. Enter your age, retirement age, current balance, pay, contribution setting, expected raises, and return. You can also set a contribution cap. The result is only an estimate. Markets change. Tax rules change. Your plan rules may differ.

Better Planning Habits

Run several scenarios. Try a low return, a moderate return, and a high return. Change the contribution rate by small steps. Review the effect of salary growth. Watch how the employer match compounds. Export the table when you want to compare plans. Use the PDF for a quick summary.

Final Thoughts

A Roth 401k decision is personal. It should fit your tax view, cash flow, risk level, and retirement timeline. This calculator gives a clear starting point. It does not replace financial advice. Use it to ask better questions and prepare for a more focused plan review. Update inputs yearly as income, laws, markets, and goals change. Small reviews improve choices over time.

FAQs

1. What is a Roth 401k?

A Roth 401k is a workplace retirement account funded with after tax employee contributions. Qualified withdrawals may be tax free later.

2. Is this calculator connected to Fidelity?

No. It is an independent planning calculator. It uses Fidelity style inputs for familiar workplace retirement planning.

3. Are employer matches always Roth money?

Not always. Some plans place employer matches in pretax accounts. Some plans may offer Roth treatment. Check your plan rules.

4. Why is current tax cost included?

Roth contributions are made after tax. The calculator estimates the tax paid now on employee contributions.

5. Does this replace financial advice?

No. It gives an estimate only. A planner or tax professional can review your full situation.

6. What return rate should I use?

Use a conservative rate, a moderate rate, and an optimistic rate. Compare the results before choosing assumptions.

7. Why add a contribution cap?

The cap keeps annual employee contributions within your selected plan limit. You can change it whenever rules or goals change.

8. What does replacement ratio mean?

Replacement ratio compares estimated retirement income with projected final salary. It helps show how much income the account may support.