How to use the dividend snowball calculator
There are two tools. Snowball follows a portfolio forward, with every dividend reinvested, until it pays the income you want. Retirement income works backwards from that income to the size of portfolio you need.
For the snowball:
- Starting portfolio and monthly contribution. What you have invested now and what you will add each month.
- Dividend yield. The average yield of the portfolio today. A broad dividend ETF typically yields less than a portfolio of high-yield stocks.
- Dividend growth and price growth. How fast payouts per share rise each year, and how fast share prices rise. When dividends grow faster than prices, each new dollar you invest buys a slightly higher yield.
- Target monthly income. The dividend income you want, before tax. It is in future dollars, so allow for inflation: $2,000 a month in 20 years buys less than $2,000 today.
The snowball assumes quarterly dividends, all reinvested, and no tax on them, as in an IRA, Roth IRA or 401(k). In a taxable account the snowball rolls more slowly; our dividend reinvestment calculator lets you set a tax rate.
The chart compares the dividends received each year with your contributions, with the target marked. The table gives the year-by-year figures, with green cells once dividends beat contributions and once income reaches the target.
How it is calculated
The snowball steps forward month by month. Every quarter, the portfolio pays a dividend on the shares it holds, and the dividend buys more shares at that day’s price:
Monthly income rate = Shares × Annual dividend per share ÷ 12The annual dividend per share starts at the yield you enter and rises by the dividend growth rate each year. Contributions buy shares every month at the current price. The target is reached when the monthly income rate first equals or exceeds it.
The retirement income tool uses a single division:
Portfolio needed = Dividends needed before tax ÷ Dividend yield
A worked example
You start with $25,000, add $500 a month, and hold stocks yielding 3.5% whose dividends grow 6% a year. Your goal is $2,000 a month.
In the first year the portfolio pays $998.85 in dividends, well under the $6,000 you contribute. By year 10 it pays $5,301.48. In year 11, dividends overtake your contributions for the first time.
You reach $2,000 a month in 22 years 1 month. The portfolio is then worth about $568,360.14, built from $157,500.00 of your own money. The rest is reinvested dividends and price growth.
To live on $60,000 a year after a 15% tax, a portfolio yielding 4% needs to be $1,764,706.
Contributions drive the early years, dividends the later ones
A snowball is slow for a long time. With these inputs, dividends cover a sixth of your yearly contributions in year 1 and only pass them in year 11. After that, the curve turns upward quickly: dividends reach $17,857.34 in year 20 and $53,229.79 in year 30.
The amount you contribute changes the timeline more than any other input you control:
| Scenario | Time to $2,000 a month | Dividends overtake contributions |
|---|---|---|
| $0 to start, $500 a month | 25 years 1 month | Year 15 |
| $25,000 to start, $500 a month | 22 years 1 month | Year 11 |
| $25,000 to start, $1,000 a month | 17 years 6 months | Year 13 |
Doubling the monthly contribution reaches the goal years sooner, even though dividends take longer to overtake the larger contributions.
High yield or dividend growth?
This is the central trade-off for dividend investors. A high-yield portfolio pays more now; a dividend growth portfolio pays less now but raises its payout faster. Compare a 6% yield growing 2% a year with a 2% yield growing 10%, with the same contributions:
| Portfolio | Dividends in year 1 | Year 10 | Year 30 | Time to target | Value after 30 years |
|---|---|---|---|---|---|
| High yield, slow growth | $1,730.00 | $8,134.78 | $56,361.78 | 20 years | $996,602.35 |
| Low yield, fast growth | $567.04 | $3,561.24 | $54,443.80 | 23 years 1 month | $1,764,459.32 |
The high-yield portfolio pays about three times as much in year 1 and still leads in year 10. It reaches the target sooner here, and after 30 years the two pay similar income. But the growth portfolio is worth far more by then, because this scenario assumes its share prices rise 8% a year against 2%.
Neither column is a forecast. Very high yields often signal that the market expects a cut, and fast dividend growth rarely lasts for decades. The useful lesson is about time: the shorter your horizon, the more current yield matters; the longer it is, the more growth can catch up.
Living on the dividends
The retirement income tool shows how much capital a dividend-only income needs. The yield has a large effect:
| Portfolio yield | Portfolio needed for $60,000 after tax |
|---|---|
| 3% | $2,352,941 |
| 4% | $1,764,706 |
| 5% | $1,411,765 |
Tax matters too. If the dividends came out of a Roth IRA with no tax, a 4% yield would need $1,500,000 instead of $1,764,706. In a taxable US account, qualified dividends are taxed at 0%, 15% or 20% depending on total income, so a moderate dividend income can fall partly or wholly in the 0% band; our dividend tax calculator works out the rate.
Living only on dividends needs more capital than a plan that also sells shares, such as the 4% rule, because it never touches the principal. The upside is that you are never forced to sell in a falling market.
What this calculator does not include
- Tax in the snowball. Dividends are reinvested in full, as in a tax-advantaged account.
- Inflation. The target is in future dollars. Raise it to keep its buying power.
- Dividend cuts and volatile prices. The projection assumes smooth growth with no recessions.
- Fees. A fund’s expense ratio reduces the effective yield; enter a slightly lower one to allow for it.
- Growth after retirement. The retirement tool sizes the portfolio for today’s income only. If dividends keep growing, the income can rise with inflation without selling shares.