Dividend Reinvestment (DRIP) Calculator (VND)
A dividend reinvestment plan (DRIP) means taking every cash dividend you receive and immediately buying more of the same shares, instead of spending it. Each reinvestment lifts the number of units you hold, so the next dividend is paid on a larger base, which buys still more units — dividends quietly start earning dividends. It is one of the most powerful compounding loops an individual investor can switch on, yet because the cash never lands in your account, plenty of people leave it off by default.
Compare the two choices on an identical position. Reinvest: each dividend is pushed back into the holding, so you ride both the rising share price and a growing pile of reinvested units. Take the cash: the shares appreciate on price alone, while the dividends are withdrawn and (we assume) sit idle earning nothing. Starting from a 100.000.000 VND position with a 5% starting dividend yield that grows 5% a year and 6%/year price growth, after 15 years the reinvestment path reaches roughly 678.314.514 VND, while the cash path — share value plus every dividend you pocketed — comes to about 415.862.561 VND. That 262.451.953 VND gap is the long-run cost of spending your dividends.
The calculator above lets you enter the starting amount, dividend yield, dividend growth, price growth and horizon, then runs both scenarios side by side, year by year. One caveat governs the whole page: every rate in the examples is an illustrative assumption, not a forecast. Dividends can be cut, share prices fall, and past performance does not guarantee future results. Use the output to feel the power of reinvestment, not as a number you are guaranteed to reach.
How the calculator models DRIP
Two scenarios, one loop
The tool runs a single year-by-year loop that advances both paths at once. At the start of each year, the dividend is the start-of-year value times that year's dividend yield:
Annual dividend = start-of-year value × dividend yield
| Symbol | Meaning |
|---|---|
| V₀ | Starting amount (default 100.000.000 VND) |
| q | First-year dividend yield (5%) |
| g | Dividend growth per year (5%) |
| p | Share-price growth per year (6%) |
| n | Years simulated (15) |
Reinvestment path (DRIP): the dividend is added straight to the holding, then the whole position grows with price: V_next = (V + dividend) × (1 + p). Every reinvested dong therefore goes on to earn its own dividends and price growth in later years.
Cash path: only the shares grow with price, V_next = V × (1 + p); the dividend is withdrawn and added to a running "cash taken" total that earns nothing further. Net worth on this path = share value + dividends taken.
After each year, the dividend yield is multiplied by (1 + g) to reflect a company raising its payout over time. This is precisely the loop the tool executes, so every row in the table reconciles.
Why reinvesting wins by so much
The edge comes from the fact that a reinvested dividend is carried by the rising share price and generates fresh dividends every remaining year — textbook compounding. A withdrawn dividend is just a static lump of cash. The more years you give it, the more the gap widens geometrically: in the example above, reinvested dividends total 319.519.851 VND, roughly 47% of the ending value.
What the model leaves out
The calculator assumes a positive, steady dividend yield and price growth for the whole horizon — in reality dividends get cut and prices fall in bad years. It also treats withdrawn dividends as idle cash (park them in a savings account and the real gap narrows), and it ignores dividend tax, trading fees and inflation. In Vietnam, cash dividends to individuals are subject to personal income tax, so the real-world reinvestment benefit also depends on how that tax is withheld. Read the result as an illustrative scenario, not a prediction.
Worked example: 100.000.000 VND, 5% dividend yield, 6%/year price growth
Illustrative assumptions: a 100.000.000 VND starting position, a 5% starting dividend yield growing 5% a year, 6%/year share-price growth, no taxes or fees. We compare reinvesting every dividend against taking it as cash (left idle).
| Milestone | Reinvest (DRIP) | Take cash (total net worth) | Reinvesting ahead by |
|---|---|---|---|
| Year 5 | 175.107.588 | 165.147.895 | 9.959.693 |
| Year 10 | 329.451.219 | 263.912.300 | 65.538.919 |
| Year 15 | 678.314.514 | 415.862.561 | 262.451.953 |
Three things stand out.
- The gap widens geometrically. After 5 years reinvesting is only 9.959.693 VND ahead — modest. By year 15 that lead has grown to 262.451.953 VND, more than the entire 100.000.000 VND you started with. The early reinvested dividends had more than a decade to multiply on themselves.
- Reinvested dividends do most of the work. The dividends pushed back into the position total 319.519.851 VND, about 47% of the ending value of 678.314.514 VND. Pure price appreciation accounts for the rest.
- Taking cash isn't wrong — it has a price. If you need the income to live on, withdrawing dividends is perfectly rational. The table just shows the opportunity cost: 262.451.953 VND over 15 years in this scenario.
Enter the rates you think fit the shares you actually hold, and try lowering the price growth to see how the gap responds. FiMo also has dividend-yield and compound-interest calculators if you want to dig deeper.
Frequently asked questions
What is a dividend reinvestment plan (DRIP)?
A DRIP means using every cash dividend you receive to buy more of the same shares or fund units instead of spending it. Your unit count grows, the next dividend is paid on a larger base, and dividends start earning dividends. Illustrative example: 100.000.000 VND at a 5% yield with 6%/year price growth reaches 678.314.514 VND after 15 years when reinvested — about 262.451.953 VND more than taking the cash.
Is it better to reinvest dividends or take the cash?
For long-term accumulation, reinvesting almost always ends with more wealth, because each reinvested dividend keeps compounding for years. In the example — 100.000.000 VND, a 5% yield and 6%/year price growth — reinvesting reaches 678.314.514 VND after 15 years versus 415.862.561 VND if you take the cash, a 262.451.953 VND gap. But if you need the dividends as income to live on, taking the cash is perfectly reasonable; the table simply shows the opportunity cost.
What is the formula behind the DRIP calculator?
The tool steps through each year. The dividend = start-of-year value × dividend yield. Reinvestment path: V_next = (V + dividend) × (1 + price growth). Cash path: shares grow on price only, V_next = V × (1 + price growth), and the dividend is added to a running cash total. After each year the dividend yield is multiplied by (1 + dividend growth). That is exactly the loop the tool runs, so every figure in the table is reproducible in a spreadsheet.
How much of the final value comes from reinvested dividends?
A lot, over a long horizon. In the example above, reinvested dividends total 319.519.851 VND, roughly 47% of the ending portfolio of 678.314.514 VND — pure price appreciation makes up the rest. That happens because dividends reinvested in the early years had over a decade to both appreciate and throw off fresh dividends of their own, which is compounding at work.
Are dividends taxed in Vietnam, and does that change DRIP?
In Vietnam, cash dividends paid to individuals are subject to personal income tax and are usually withheld at source before the money reaches you. So the amount actually available to reinvest is the after-tax dividend, smaller than the gross figure. This calculator simulates the dividend stream you enter and does not deduct tax or fees, so its output is a pre-tax scenario. For a realistic plan, enter a yield that already reflects the tax withheld.
Are the rates in the example guaranteed returns?
No. The 5% dividend yield (growing 5%/year) and 6%/year price growth are illustrative assumptions chosen to keep the math clear — not forecasts or promises. Companies cut dividends, share prices fall in bad years, and past performance does not guarantee future results. Replace them with rates you consider realistic for the shares you hold, and stress-test a lower price growth to see how sensitive the plan is.