After you file

But it's not logical for me: I have already received money for 2019. How come amended return can give more money??? (I am not adding any w2 I only added some cash income on schedule C)

My logic works like this: IRS "Hey we gave you $1500, now with this amending we owe you $500 refund. Since we have already gave you $1500  YOU OWE US $1000