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In 2016, you receive one credit for each $1,260 of earnings, up to the maximum of four credits per year.
Following publication might be helpful
Your personal deductions would NOT affect your social security credits - but business deductions will affect.
For purposes of earning social security credits - ONLY net business income that is used to calculate self-employment taxes is counted.
On your tax return - that amount will be on schedule SE line 4
To earn the maximum of four credits per 2016 - your income on that line should be $1,260 * 4 = $5,040.
You may not just choose not to report qualifying deductions...
If you reported deductions incorrectly - then - yes - you may amend your 2014 tax return and make corrections.
But if you correctly reported all business expenses - there is nothing you may do.
I suggest to review your 2014 tax return and verify if all deductions were reported correctly.
Here is a table that show
Amount of earnings needed to earn one quarter of coverage
For 2014 - you would need $1,200 to earn ONE SSA credit.