Like Rafael already mentioned, it all depends on your field, being a little specific would help to answer your question.
For example, in addition to what Rafael Miranda already mentioned you might need to budget for things like,
Metrics & Analytics tools,
DB & stack Performance monitoring tools
Onboarding and retention tools
Transactional email services
But all are negligible in comparison to the budget that you might need for staff (developers / marketing & customer support)
And also things like office space if your set up requires that.
So everything really depends on your specific set up, location (SV or ??) and of course your runway which in high degree determine your cash burn rate.
And last but not least, don't make positive calculations when it comes to CAC and Churn rate.
So base your calculations always on a worst case scenario.