Hi Bryanvac, good day! Thank you for joining the TurboTax Special Forum.
The $25K is a threshold (base amount) to calculate excess income that trigger the taxability of Social Security Benefits. It is a part of formula/worksheet.
A portion of Social Security retirement and disability benefits may be taxable when income exceeds a taxpayer’s base amount. Certain amounts that are nontaxable for regular income tax purposes are added back to determine taxable Social Security benefits. The base amount is determined by the taxpayer’s filing status.
MFJ $32,000
Single, HOH, QW, MFS (lived apart from spouse all year) $25,000
MFS (lived with spouse at any time during the year) $0
Rate of taxation. Income above a taxpayer’s base amount will result in an inclusion of up to 50% (85% for higher incomes) of the taxpayer’s Social Security benefits on line 6b, Form 1040. If a taxpayer’s income is above the base amount, use the Social Security Benefits Worksheet:
Page 16 of IRS Pub 925 - Worksheet 1
https://www.irs.gov/pub/irs-pdf/p915.pdf
If you examine the worksheet, line 3 description: Combine the amounts from: Form 1040 or 1040-SR, lines 1, 2b, 3b, 4b, 5b, 7; and Schedule 1 (Form 1040), line 9.
They are Wages, taxable interest, ordinary dividends, taxable IRA distribution, taxable pensions and annuities, capital gain (loss up to $3K), Schedule 1 additional income, which are subject to the threshold.
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