Cash flow timing: bills and paydays

• The lab expands once, weekly, every-two-week and monthly events into the selected month, using each schedule's first date.
• Weekly payments repeat every seven days and every-two-week payments repeat every fourteen days. Their original first date stays fixed when you select another month, so the schedule can produce different payment counts in different months.
• Expenses are subtracted before income on the same day. The timeline shows each change; the calendar shows each day's closing balance. A positive closing balance does not mean every payment that day was covered before a deposit arrived.
• The starting balance is the amount available at the beginning of the selected month. Selecting another month changes which payments appear, but does not reconstruct bank history or carry the previous month's ending balance forward. Enter the appropriate starting balance for the month being modeled.

With a $1,000 starting balance, $1,200 rent on the first and a $3,000 paycheck on the fifteenth, the modeled lowest balance is -$200. The month ends at $2,800 if there are no other events. Moving the paycheck to the first still leaves a modeled same-day gap because this lab subtracts expenses before adding income. The calendar's closing balance and the timeline's lowest balance answer different questions.

• Monthly dates use the last valid day in a shorter month, then return to the original day. A bill anchored to January 31 falls on February 28, or February 29 in a leap year, then returns to March 31.
• The starting balance applies only to the selected month and does not carry forward automatically.
• Actual posting times, pending transactions, weekend or holiday settlement changes, interest and fees are not included. The additional buffer is only the modeled gap needed to reach $0, with no extra cushion added.

Finance Quest is educational. It is not financial advice, and no calculator here knows your full situation.

Income can exceed expenses for the month while a bill before payday takes the balance below $0. Monthly averages do not model that timing.

• Budget builderPlan a balanced monthly budget with allocation benchmarks.
• PaycheckEstimate take-home pay with tax and deduction assumptions.
• Emergency fundSize and timeline a reserve from monthly burn.