Variable Income Budget Calculator

Baseline Remaining (Low) is calculated only from Lowest Monthly Income and total expenses, by design -- it exists to show what a genuinely bad month looks like on its own, without a better average or high month changing the answer. Average Monthly Income instead drives Comfort Remaining (Avg), a separate figure computed the same way but using the average scenario.

It is Average Monthly Income minus Lowest Monthly Income -- the gap between a typical month and a single low month, not a full reserve target. A larger buffer means income swings more between good and bad months, which generally points toward needing a bigger cash reserve, but a reserve sized to cover only one lean month is undersized if a downturn runs longer than a single month -- this calculator does not attempt to size a multi-month reserve for you.

Baseline Remaining (Low) is income minus expenses only; the Savings Goal percentage is applied afterward, in Savings at Baseline and Baseline After Savings, which show how much of that baseline would go to savings and what remains once it does. Separating the two lets you see the pre-savings cushion before deciding how aggressively to save from it.

Baseline Remaining (Low) shows the floor -- what fixed and variable costs leave over in a worst-case month -- and is the number to budget against for recurring commitments. Comfort Remaining (Avg) and Surplus Remaining (High) show what additional room a typical or strong month provides, which is the room available for irregular expenses, extra savings, or discretionary spending without threatening the baseline. This only holds if Lowest, Average and Highest Monthly Income were actually entered from smallest to largest -- check Income Order Check first, since the three "Remaining" figures are computed directly from whatever was typed into each field and do not get re-sorted for you.

Baseline Remaining (Low) will be negative, meaning a bad month alone does not cover recurring costs -- a real risk for variable-income earners that this calculator is designed to surface rather than hide behind an average. Separately, Baseline After Savings can go negative even when Baseline Remaining is positive, if the Savings Goal percentage applied to a low month exceeds what that month has left over; Baseline Savings Shortfall reports that gap in dollars. Either way, the fix is the same: lower the Savings Goal, cut Fixed or Variable Expenses, or plan to draw on a reserve during low months rather than relying on credit.