Skip to content
Copper
← All stories

Cash-flow budgeting

How Much Can I Spend Before Payday? A Worked Example

By Copper editorial ·

General budgeting education. Examples are illustrative.

Your bank balance tells you what is in an account. It does not tell you how much is already promised to rent, groceries, a goal, or a purchase that has not posted. A cash-flow budget adds another question: when will the money leave, and when will more arrive?

Where the example’s $2,400 goes
Where the example’s $2,400 goes
Rent
$1,000
Groceries
$300
Transport
$100
Savings goal
$300
Chosen buffer
$200
Additional pending
$120
Unallocated
$380

Illustrative amounts, not customer data. Reservations: $1,900. Additional pending purchases: $120. Unallocated remainder: $380.

Start with money you can actually use

Choose the period you are planning for: today through the day before your next expected paycheck clears. List cash you can use during that period. Do not include a credit limit, money locked away, or a paycheck that has not arrived. If income timing is uncertain, use a conservative date and revisit the plan when the deposit clears.

Check your bank’s definition of its balance. An available balance may already reflect some pending transactions, while another balance may not. Write down the balance timestamp and what it includes. The calculation below subtracts only obligations that are not already reflected in the starting cash.

A $2,400 worked example

Imagine $2,400 of usable cash and ten days until payday. You reserve $1,000 for rent, $300 for groceries, $100 for transport, $300 for a savings goal, and a $200 checking buffer you chose for this example. Those reservations total $1,900. You also have $120 of pending purchases that are neither deducted from the starting cash nor covered by those reservations.

The arithmetic is $2,400 − $1,900 − $120 = $380. That $380 is the unallocated remainder for this planning period. The $200 buffer and $300 savings goal are example choices, not recommended amounts for every household.

Count each dollar once

Suppose a $40 pending grocery purchase is already included in your $300 grocery reservation. Do not reserve the same $40 again as an additional pending deduction. Instead, reconcile the purchase against that grocery amount. Likewise, if your starting available balance already subtracts a pending purchase, subtracting it again would understate your remainder.

Make a small list of each pending purchase, whether the bank balance includes it, and which reservation covers it. Reconcile those entries when they post. Include outstanding checks, upcoming automatic payments, and credit-card payments you need to fund, without counting both the underlying spending and its payment twice.

Use $38 a day as a pace, not permission

Dividing the $380 remainder by ten days gives an illustrative $38-per-day pace. It is a way to notice whether spending is running ahead of the plan; it is not a promise that every day has $38 available. A bill could be due tomorrow, or the cash might be in an account that cannot fund the payment in time.

For example, spending $70 on the first day leaves $310 for nine days, or about $34.44 a day. You can choose to slow later discretionary spending or revise a goal. If the remainder is negative, the plan has a shortfall. Review flexible reservations and payment timing before treating any amount as available.

Check timing and account-level cash

Put each expected deposit and payment on a calendar. Start with today’s usable balance in each payment account, then work forward by date. A positive total across accounts does not prevent a particular checking account from running short. Allow for transfer delays and confirm payment dates with the provider.

The Consumer Financial Protection Bureau’s cash-flow budget tool organizes income and expenses by week and carries the ending balance into the next week. That timing view complements the reservation calculation: one shows what money is spoken for, while the other shows whether it will be available when needed.

Make the next review small

Before a discretionary purchase, check what has changed: new transactions, a shifted bill date, a delayed paycheck, or a balance that has not updated. After payday, rebuild the next period rather than reusing the old daily pace.

Copper describes its approach as setting money aside for bills, spending, and goals, then showing what is left-to-spend. These are budget allocations; they do not move money between bank accounts. You can also use the method in a notebook or spreadsheet. The useful habit is keeping reservations, transactions, and dates consistent.

Sources and further reading