It would be in your best interest to jot down all of the expenses associated with performing the services you provide within your service region to determine a baseline operating cost. Then, at that point, you can calculate the fees that will generate a net profit to determine if you’ll have a Profit or sustain a Loss at that rate.
There are many items to consider within your Overhead calculations. Here are a few to get you started:
• telephone expenses including cell phone equipment and monthly service fees
• office equipment and furniture; i.e., work chair, work desk, reliable dual-tray printer, trustworthy scanner, etc.
• Notarial stamps for Jurats, Acknowledgements, Notarial Name, Commission Expiration, etc.
• rent and utilities
• paper
• toner
• binder clips
• pens (inexpensive for one-time use)
• stationery and supplies including stamps & envelopes
• travel costs to & from signer locations (i.e., create a generic by county list)
• travel costs to & from FedEx/UPS/USPS, etc. (i.e., choose your favorite location OR the closest that will provide you with a receipt)
• business insurance
• business-related meals and entertainment
• professional association memberships
• annual background checks
• annual certification expenses
• legal and accounting fees
• tax preparation fees
• advertising and marketing costs; i.e., Google ads, yellow pages ad, website, business cards, or brochure
• Protection equipment; i.e., COVID-19 masks, hand sanitizer, wipes, etc.
AND many more!
Your individual overhead would also include the cost of fringe benefits; i.e., medical insurance, disability insurance, retirement benefits. Also, remember to include quarterly income tax payment to federal & state (as appropriate) and self-employment taxes.
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If calculating all this accurately seems to be a bit overwhelming, reach out to your tax advisor and ask for guidance in this regard. 
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Also, there is an excellent specific cost breakdown by one business owner for services within her [ @anon78047977 ] region & for her overhead:
"Ok for a seasoned already in business Signing Agent (meaning no start up costs to factor in, just on going costs)
Average Refinance
- 150 pages (300 when having to print 2 copies)
- 35 miles average miles to signing/from signing/to FedEx drop
- Print cost average .15 per page (Laser printer, standard paper. Note this is also the cost at Staples, FedEx Office in the area BUT I have actually calculated my real costs by dividing the number of pages I get from a toner kit, my drum kit, cost of paper etc. but I use this average of .15 because there are Notaries around who actually use outside printing)
- IRS mileage .56 per mile (you can use actual costs of gas, insurance, plus maintenance costs. I will use the IRS rate because it’s a good average and I also have Tolls I have to pay which I will not add in this example. Also later I kind of use this amount as a “catch all” for other expenses. Again, I have determined my “actual” costs and the averages I use are pretty spot on.)
- 2.25 hours an average total time spent which includes, confirming appt & reviewing instructions, printing/prepping docs, travel time to/from/to FedEx, signing/notarizing docs, scan back
- Costs that people usually do not take into consideration because it’s part of their household BUT they are costs of running a business (home office expenses - internet, electric, computer, phone, supplies, etc.) Remember every business has similar expenses
So here we go…let’s look at average total for this signing:
$45 print costs
$19.60 mileage rate (So this number is based on IRS mileage rate. I use this number as a catch all to give me an estimate of my actual costs (gas, toll, %of annual maintenance, %of insurance and a % of home office costs, %of supplies, etc. Since I know my % for every business expenses, I already know this number is pretty close to my actual costs. For example my actual costs for this signing would be around $21)
It will cost me $64.60 for a 150 page refinance order. With no issues, no traffic, no reprints, no problems
If I took a $75 signing fee I would net $10.40
I would net roughly $4.62 per hour for a signing that took up 2.25 hours of my time.
$95 I would net $30.40 or $13.51 per hour
$125 I would net $60.40 or $26.84 per hour
$150 I would net $85.40 or $37.96 per hour
So when I advocate for SAs and fees I am not just coming up with number off the top of my head. I have done the math for myself personally."
SOURCE: Signing Agent Fee is Just Not a Notary Fee - #38 by notarybe