403(b) Calculator
Enter the initial balance, monthly contribution, expected annual return, and contribution years to estimate the compound future value, total principal, and investment gains of a 403(b) retirement account at retirement.
Input Data
Results
At a glance:A 403(b) grows by monthly-compounded contributions and returns; the future value combines the initial balance, contributions, and accumulated investment gains.
Formula
futureValue = initialBalance·(1+r)^n + monthlyContribution·((1+r)^n − 1)/r (r = annualReturn%/12, n = years×12)
totalContributed = initialBalance + monthlyContribution×years×12
totalInterest = futureValue − totalContributed
$$FV = P(1+i)^n + PMT\cdot\dfrac{(1+i)^n-1}{i}$$$$i = \dfrac{r}{12},\quad n = \text{years}\times 12$$$$\text{Interest} = FV - \left(P + PMT\times n\right)$$How to Use
- Enter the initial balance and monthly contribution.
- Enter the annual return and years to retirement.
- Review the value, principal, and gains.
FAQ
What is the difference between a 403(b) and a 401(k)?
Their tax treatment and mechanics are almost identical; the main difference is eligibility. A 401(k) is for private-sector employees, while a 403(b) is for employees of public schools, universities, hospitals and charities (non-profits). The calculation logic (regular contributions + compounding) is exactly the same, so this calculator differs from the 401(k) one only in its default scenario.
How can Hong Kong teachers or healthcare workers apply this?
Hong Kong educators and grant-aided institutions often have a provident fund or ORSO occupational scheme, plus the universal MPF. Enter your own plus the institution's combined contribution as the monthly contribution to estimate the long-term value of your retirement account for planning.
Should the monthly contribution include the employer match?
Yes, ideally. The account actually compounds on the combined employee-plus-employer contribution. If you only want to see your own slice's growth, enter just the employee amount; for the full account value, enter the combined figure. Non-profit employers often match generously, so don't omit it.
Does the result account for inflation and fund fees?
No. The output is nominal, not net of inflation or fund expenses. For real purchasing power, subtract about 2%–3% inflation from the return and recompute; MPF fund expense ratios (FER) of about 0.5%–2% can also be deducted from the return first.
When can the retirement account be withdrawn?
A US 403(b) is generally withdrawable after age 59½, with penalties for early withdrawal. Hong Kong's MPF is generally withdrawn at age 65, or earlier only on statutory grounds (early retirement, permanent departure from HK). This calculator estimates only the accumulation-phase value; for drawdown planning see our RMD calculator.
This calculator's content is reviewed by our Licensed Financial Planning team. Results are for reference only; please refer to the relevant authorities for the official figures.