How do I model the growth of investments over time?
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Within the Account forms in the Plan UI, you can choose whether you want each account to grow at your plan-level investment growth / dividend rates (i.e. the ones defined in Plan Settings > Growth Rates), or at different custom rates per account.
Also note that in Plan Settings > Growth Rates, you don’t necessarily have to assume fixed rates either. If desired, you could choose a specific historical returns sequence, or define a custom sequence of returns using the Advanced editor.
And then separately in Monte Carlo mode (Chance of Success tab), returns/dividends in each trial there are controlled by whatever MC configuration you choose, e.g. historical data or custom probability distributions.