FYI, I put the number of notary acts (which is how my state limits official notary fees) in the margin of my notary journal, next to each entry.
For example, a loan package has 11 oaths/acknowledgements, per spouse (22 total), throughout 200 pages of documents, with a total charge of $100. Let's assume there's 20 miles of driving ($11.60) and $7.25 ink and paper (and no other expenses).
We'll assume that's the only assignment for the year.
So, you get:
$100 gross income (included in Schedule C - sales), minus
$11.60 mileage (included in Schedule C - transportation), minus
$7.25 mileage (included in Schedule C - office expense), which equals
$81.15 Schedule C business income, carried back to Form 1040.
Self employment taxes (Schedule SE) would be calculated based on the non-exempt amount, which is:
$81.15 Schedule C business income, minus
$44 public officer exemption (22 acts x $2 per act statutory ceiling in NY)m which equals
$37.15 reported on Schedule SE to determine self-employment tax
Expenses may include mileage (not just to signing, but also to scan and drop to FedEx/UPS), printing, paper, toner, notary license fee, insurance, NNA membership, testing, education and many other items, All the expenses would be consolidated and reported on Schedule C.
I hope this is useful.