Formula Used
Allowed Roth contribution = the lowest of planned contribution, taxable compensation, remaining IRA room, and MAGI adjusted Roth limit.
Remaining IRA room = annual IRA limit minus other traditional or Roth IRA contributions entered by the user.
MAGI adjusted Roth limit = annual limit when income is below the phaseout range. Inside the range, the allowed amount is reduced proportionally. Above the range, it becomes zero.
Periodic return = (1 + net annual return) raised to 1 divided by periods per year, minus 1.
Projected balance = prior balance compounded each period, plus allowed periodic contributions. Beginning contributions compound one extra period.
Real balance = projected future balance divided by compounded inflation for the full projection period.
Overview
A Roth IRA calculator helps estimate how today's deposits may grow over time. This version focuses on a Charles Schwab style retirement planning workflow. It uses current balance, age, income, filing status, yearly deposits, investment return, expenses, and inflation. The goal is not to promise a result. It gives a clear planning range that can guide better saving decisions.
Why This Tool Matters
Roth IRA contributions are made with after tax dollars. Qualified withdrawals may be tax free later. That makes growth, timing, and eligibility important. A small change in return, contribution level, or retirement age can shift the ending balance. This calculator shows those changes in one place. It also warns when planned deposits may exceed the entered eligibility limit.
Planning Inputs
Start with your current Roth IRA balance. Add your age and expected retirement age. Enter your modified adjusted gross income and filing status. Then choose a contribution amount. The tool compares that amount with the annual limit, compensation, other IRA deposits, and phaseout rules. It uses the allowed amount in the projection, not the higher planned amount.
Projection Method
The balance grows with compound returns. Contributions may be treated as monthly or yearly deposits. Beginning deposits receive one extra compounding period. The net return subtracts the expense ratio from the expected return. The real value also adjusts for inflation. This helps compare future dollars with today's buying power.
Using The Results
Review the estimated future balance first. Then check total deposits, growth, allowed contribution, and possible excess amount. The yearly table shows how the balance builds. Low and high scenarios help frame uncertainty. Export the CSV for spreadsheet review. Export the PDF for a quick planning record.
Important Notes
This calculator is educational. It is not tax, legal, or investment advice. Actual eligibility can depend on exact IRS rules, earned income, spouse income, prior contributions, and tax filing details. Charles Schwab, tax software, or a qualified professional can confirm final limits. Review assumptions each year because contribution limits and income ranges can change.
Next Steps
Save a copy of each estimate. Compare it with your monthly budget. Increase contributions when cash flow improves. Revisit risk settings after major income, market, or family changes during the year.
FAQs
1. Is this calculator affiliated with Charles Schwab?
No. It is an independent educational calculator. It uses a planning style that fits Roth IRA account holders, but it is not endorsed by Charles Schwab.
2. Does the calculator give tax advice?
No. It gives estimates based on your entries. Confirm contribution limits, phaseouts, earned income rules, and excess contribution issues with a qualified tax professional.
3. Why does MAGI affect my Roth IRA contribution?
Roth IRA eligibility phases out at higher modified adjusted gross income levels. The calculator reduces the allowed contribution when income falls inside the phaseout range.
4. What does other IRA contributions mean?
It means money added to other traditional or Roth IRAs for the same year. The annual IRA limit generally applies across all IRAs combined.
5. Why is the planned contribution different from the allowed contribution?
The planned amount is what you want to deposit. The allowed amount is limited by income, compensation, phaseout rules, and other IRA contributions entered.
6. What is taxable account tax drag?
It is an estimated yearly reduction for taxes on dividends, interest, or realized gains in a taxable account. It helps compare Roth growth with taxable investing.
7. Should I use monthly or annual contributions?
Use monthly when deposits happen throughout the year. Use annual when you contribute once. Beginning timing assumes deposits arrive before each compounding period.
8. Can I rely on the PDF report?
Use it as a planning record only. Save assumptions with the report, and update it when income, limits, market expectations, or retirement goals change.