A purchase payment is where you are buying something. In this case, they are buying our services.
A personal payment is a parent sending money to a college student.
Technically, as contractors, our Paypal accounts could become classified as Business accounts. They used to do that automatically if anyone paid you with a credit card more than (I think) three times. Once you were classified as a business account, they took approx. 3% fee on all your incoming payments. I'm not sure what their policy is now, I know they've made some changes, and I know the sender can opt to pay the fees.
I have both a business account (attached to my LLC) and a personal account (attached to my personal bank account and credit card). I have my MS pay directed to my personal account since it is not going through my LLC, but onto a Schedule C on my personal tax return. I've only received one payment for MSing and no fees were taken but I didn't look to see how the MSC "coded" the payment. All payments through my business account have fees taken out of them.
I've been wondering if fees will be taken out of the MS payments. I should be getting a few payments soon so I'll have to look and see what they do. I don't care if they pay by PP or DD but for the pittance many of them are paying, I may just throw a hissy fit if I start losing 3% to Paypal.
Paypal takes the 3% fee for credit card payments, to cover what they have to pay the CC companies. If the MSC's are not using a credit card to pay us, there shouldn't be any fees involved. So maybe that's what happened to OP, the MSC paid by credit card.
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I pray it does not occur that the last thing I did before I died was vacuum the house or eat broccoli.