FEHB disability pension & MRA

I receive a FERS disability pension, with less than 10 years service. My minimum retirement age by year of birth is 57, but I only have 8.5 years of service, my urgent age is 59, and I also receive my prior military retirement. Since I have less than 10 years of service i was told my minimum retirement age for tax purposes is 62 years, is this correct? As such my disability has been fully taxed as income on line 1a of the tax form. Thanks for any help on this topic. - Paul

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