How the Stop & Grow estimate works
During the active phase, contributions use the annuity-due formula: Active corpus = Contribution × ((1 + i)n − 1) ÷ i × (1 + i). During the wait phase, that corpus grows by (1 + i)w without new contributions.
Active phase
Equal contributions are assumed at the beginning of each monthly or yearly period.
Wait phase
No new money is added; the active-phase balance continues to compound.
Assumptions
The return stays constant; volatility, tax, fees, missed contributions, and withdrawals are excluded.