GeneralJist said:
more than $600 last year
I've got some family members who are accountants and we've had the discussion a few times. Details matter. Exactly how much more than 600 will be the big factor. Since it is payments out it is less important than income you made. Talk to a tax professional if you're concerned about it at all.
For a hobby project you're most likely part of what's called the “gray economy” or “informal economy”, big enough that money starts to matter across all of society, but small enough it often isn't reported. Small hobby businesses in the category can mean things like private music lessons from the home, teens doing child care or yard care or pet care.
If you're running your small business as a business, taking steps to organize it as a legal entity, maintaining proper bookkeeping, etc., then err on the side of caution and submit the forms even if they're near or below the reporting limit. They're not difficult to file. Better safe than sorry.
If you're running it as a hobby, it's mostly about risk tolerance. If it is clearly a hobby and you hired them as a one-off service that's not something they typically care about during audits. In that case since you're not doing business reporting and business filings then it is considered the responsibility of the person making the money, less the responsibility of the person paying the money. For example you don't send tax reports about your other monthly services, your monthly internet bill, your monthly power bill, your groceries, even though they are regular expenses made to other entities. You probably don't even have their tax information to properly report it, anyway.
The big thing the IRS cares about is that they match. Whatever the payer submits and the payee submits should be the same.