"Statement has no effect"

[Mekire]

Well, I would rather see something like this (untested):

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FIELDS = ["MS", "StartYear", "YourStartAge", "HerStartAge", "Exempt",
    "BFedItmDed", "FedItmDedYrs", "State", "LivExp", "Inflation", "Inf1",
    "Inf2", "Inf3", "Inf4", "Inf5", "Inf6", "Inf7", "Inf8", "Inf9", "Inf10",
    "TESTPcnt", "TESTYr", "TFISTPcnt", "TFISTYr", "TFESTPcnt", "TFESTYr",
    "TFFISTPcnt", "TFFISTYr", "TDESTPcnt", "TDESTYr", "TDFISTPcnt", "TDFISTYr",
    "BTE", "BTFI", "BTC", "TERtn", "TFIRtn", "TCRtn", "BTFE", "BTFFI", "BTFC",
    "TFERtn", "TFFIRtn", "TFCRtn", "BTDE", "BTDFI", "BTDC", "TDERtn", "TDFIRtn",
    "TDCRtn", "YourJob", "SpJob", "YourRetInc", "SpRetInc", "YourSSInc62",
    "YourSSIncFRA", "YourSSInc70", "SpSSInc62", "SpSSIncFRA", "SpSSInc70",
    "YourRetAge", "SpRetAge", "YouBgnRetIncAge", "SpBgnRetIncAge",
    "YouSSStartAge", "SpSSStartAge", "IraStartAge", "IraEndAge", "IraRequest"]


with open("in_file.txt") as in_file, open("out_file.txt" 'w') as out_file:
    for line in in_file:
        data = {key: val for (key, value) in zip(FIELDS, line.strip().split()}
        # do something with data presumably converting some of them to
        # the needed data types for calculation.
        out_file.write(" ".join(data[key] for key in FIELDS) + "\n")

But really as Metul said you should, at bare minimum, probably be using JSON. Honestly it kinda looks like you should be using an actual database.