If I make the same amount as last year between my social security and my extra work I do from home, why am I still paying the same tax with a $13,600 deduction?

I am self employed and work from home.  $24,274 from Social Security and $10,150 from business income and $2,098 from small pension.  Almost same as last year.  Why am I paying basically same tax as last year when my personal deduction is now $13,600?