How to read the number

The hourly rate is your floor: it is the price at which the year works. Quote above it for work you are good at, at it for work you want to win, and never below it without reducing the scope.

The model assumes tax is a percentage of profit and that every rupee of revenue is taxable. That is a simplification. It also assumes you can actually sell the billable hours you entered — for most people starting out, the first three months do not fill up.

The assumptions that matter most

Billable hours — 25–28 per week is realistic for a solo practice. 40 is not, because sales, admin and learning are unpaid.
Buffer — three months is the minimum for a practice without retainers.
Tax — use your effective rate on total income, not the headline slab.

If you want the reasoning behind the model, read the rate model guide.