Deductions & credits

Please explain this further as it doesn't seem a realistic response to me (not saying that's it's YOU who is wrong !) 

 

I do have about $10000 a year in social security/pension income. Incidentally, The money on the 1099k is WAY less for me after all fees and expenses of doing business are taken out   and from what I got to see came (thousands) in car repair, health care and, FINALLY, new eyeglasses. so, yes, I'm poor

 

How could filing capital gains reduce what I owe in taxes (or how could I not have taxes on $30,000?) 

 

Sorry I'm so dense.

 

Thanks 

 

-Allan