Fact 1: The free plan has hard usage limits
Zoho Invoice's free plan allows 500 invoices/year and 3 active projects. A freelancer billing 10 active clients monthly already generates 120 invoices/year from regular billing alone — add deposits, milestones and revisions and many freelancers reach 200–300/year. Reviewers note: "If you approach 500 invoices per year or need more than 2 users, you should prepare to upgrade to a paid Zoho Books plan or another solution." There is no paid upgrade path inside Zoho Invoice — the intended next step is migrating to Zoho Books from $15/mo, a different product with its own setup.