I have a one man company and so far, I am paying or would gladly pay for the following on a monthly basis
- Payroll processing fee (through my bank but they use Intuit)
- Freshbooks for invoicing (free for me since < 3 clients but would gladly pay if needed)
- Wave Accounting software for small business. This one is still not quite there in my opinion. I am using it so far because it is free but not the best. Quickbooks scares the heck out of me (too bloated for my needs).