If the Social security and 401k withdrawal are your only income, you will not owe any tax and will not even be required to file a tax return (unless your filing status is Married Filing Separately).
Social security only
becomes taxable when added to sufficient other income.
Social security (including SSDI) becomes taxable when your income,
including 1/2 your social security, reaches:
Married Filing Jointly(MFJ): $32,000
Single or head of household: $25,000
Married Filing Separately and lived with your spouse at any
time during the tax year: $0
Half of 18,612 is 9306. 9306 + 10,000 = 19306 < 25,000 None of your SS is taxable.
Since $10,000 is less than the filing threshold, you do not need to file.
