Dividend Reinvestment Calculator

About this tool

The dividend reinvestment calculator models a Dividend Reinvestment Plan (DRIP), in which every cash dividend automatically buys fractional shares of the same security instead of landing in your sweep account. Over decades the rising share count multiplies the dividend stream and supercharges total return relative to a cash payout policy.

The mechanic captures three compounding effects at once: the share count grows each quarter, the dividend per share itself rises if the company is a dividend grower, and the underlying share price typically appreciates. A 3.5 percent yield with 6 percent annual dividend growth, fully reinvested, can quadruple the income stream in 20 years.

How it works

For each year y:
  cash_dividend_y = shares_y * dividend_per_share_y
  new_shares_y    = (cash_dividend_y + contribution_y) / price_y_end
  shares_{y+1}    = shares_y + new_shares_y
  div_per_share_{y+1} = div_per_share_y * (1 + dividend_growth)
  price_{y+1}     = price_y * (1 + price_growth)
Yield_on_cost_final = final_dividend_per_share / initial_average_cost

• shares = running share count after reinvestments.
• dividend per share = current annual payout per share; grows at the issuer's dividend growth rate.
• price = market price at year end; used as the reinvestment basis.
• contribution = any extra cash you add (monthly SIP turned into an annual figure).
• yield on cost = final dividend per share divided by your initial average cost per share.

Worked example

An investor puts 10,000 USD into Johnson and Johnson at 165 USD per share (60.6 shares) in 2026. JNJ pays a 3.2 percent yield with 6 percent annual dividend growth and 5 percent annual price appreciation. DRIP is enabled, no additional contributions:

1. Year 0: 60.6 shares, 5.28 USD dividend per share, 320 USD annual dividend income.
2. Year 1: dividend reinvested at 173 USD per share buys 1.85 new shares, total 62.45 shares, payout grows to 5.60 USD per share.
3. Year 10: roughly 87 shares, dividend per share at 9.45 USD, annual income about 822 USD, share price near 269 USD.
4. Year 20: roughly 132 shares, dividend per share at 16.93 USD, annual income about 2,235 USD, share price near 437 USD.
5. Year 30 portfolio value: approximately 96,500 USD with about 5,420 USD annual dividend income.

DRIP vs no DRIP at 30 years (10,000 USD initial)

Common mistakes

• Chasing yield over growth. A 10 percent yielder with no dividend growth often underperforms a 2 percent yielder with 10 percent dividend growth over 20 years, before any share price difference.
• Running DRIP in a taxable account near retirement. Each reinvestment creates a new tax lot, complicating wash sales, cost basis tracking, and eventual sales. Many retirees turn DRIP off five years before they expect to draw down.
• Ignoring foreign withholding. Non US dividend payers (Unilever, Nestle, BHP) often have 15 to 35 percent withholding that DRIP cannot recover. Hold these in tax sheltered accounts where treaty relief applies.
• Forgetting the cost basis paperwork. Every reinvestment is a separate tax lot. Use brokerage cost basis reporting (FIFO or specific identification) rather than reconstructing it manually at sale.
• Mixing DRIP with rebalancing. Forced reinvestment in the same security defeats target weight rebalancing. Either run DRIP and let weights drift, or take cash and reinvest where allocations need topping up.
• Assuming dividends never get cut. Banks, oil majors, and pandemic era REITs slashed or suspended dividends. Model a 20 to 30 percent payout cut every 15 years for realistic stress testing.

Related tools and glossary

Frequently asked questions

Sources

• Ned Davis Research, Long Run Returns of Dividend Payers vs Non Payers, 1972 to 2025.
• Hartford Funds, The Power of Dividends: Past, Present, and Future, 2025 update.
• IRS Publication 550, Investment Income and Expenses, dividend qualification rules.
• SEC Investor Bulletin, Dividend Reinvestment Plans, 2024 revision.

Last updated 2026-05-28.