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Retirement formula for annual compound interest with changing principal
I've found the systems that seem to work. Firstly, you need to find how much money is required to pay for the withdrawals after retirement, while still accruing interest.  I couldn't seem to do this with an equation, but this bit of javascript worked: yearsToLast: Number of years of yearly withdrawals yearlyWithdrawal: Amount to withdraw each year interest: Decimal form of yearly compounding interest Now that we have how much is required at the beginning of the retirement, to figure out how much to add yearly to hit this mark, you'd use: amount: Previously found required amount to reach interest: Decimal form of yearly compounding interest yearsSaving: Number of years saving till amount needs to be hit I hope this helps some other poor soul, because I could find squat on how to do this. Max