Formula
Reserve = max(0, (revenue − deductible expenses) × (income tax rate + additional tax rate) − credits)
This simplified estimate applies user-entered effective rates to projected business profit.
What the result means
The reserve is a budgeting estimate for cash separation. It is not a tax return calculation and does not account for brackets, entity elections, local rules, deduction limits, or payment timing.
Tax treatment varies by location and business structure. Use current guidance from a qualified tax professional to choose the rates and determine actual estimated-payment dates.