General liability covers damage you cause on site, a tripod leg going through drywall or a homeowner tripping over your light stand. Brokerages and relocation companies often want a certificate naming them, and a million per occurrence with two million aggregate is the usual ask. For a one-person photo operation that tends to run a few hundred dollars to around $700 a year. It does not cover your own gear. Gear sits on an inland marine or scheduled equipment policy, priced off replacement value.
Business licensing is local. Most cities want a business license or a home occupation permit, and some states treat photography as a taxable sale and want you registered for sales tax, so check your own city and state because both of those vary by state.
Outsourced editing is real and runs roughly $1 to $3 an image depending on turnaround and how much sky replacement and window blending you want. The AI-assisted services sit at the bottom of that range. At 25 images a house you're spending $25 to $75 out of the shoot fee.
Software is small. A photo editor subscription is around $10 to $15 a month and a delivery gallery another $10 to $30. Matterport hosting is priced per active model on top of a plan fee, if you get into 3D at all.
The thing that bites people who promise 24 hours is redundancy. One dead card or a body that won't fire and you're reshooting for free on your own gas. A second body and a spare set of cards costs less than one blown deadline with an agent who lists twice a month.