The One Number Budget
Reduce your whole budget to one safe-to-spend number after bills and savings are set aside.
TL;DR
- Subtract bills and savings to find one
spendNumber. - Divide the total by days for a
dailyLimit. - Track only that single
safeToSpendamount.
Calculate Your One Number
Start With IncomeBegin with your take-home pay for the pay period.
Take-home this month = $3,200Subtract BillsRemove all fixed bills and required minimum payments.
$3,200 - $2,000 bills = $1,200Subtract SavingsRemove your pay-yourself-first savings amount next.
$1,200 - $400 savings = $800Handle IrregularsSet aside a slice for yearly bills before you finalize the number.
Minus $50/mo for annual billsTurn It Into a Daily Limit
Divide by DaysSplit the number across the days until your next payday.
$800 / 30 days = about $27/dayTrack the PaceCompare your daily spending against that target figure.
$27/day target vs. actualRoll With ItUnderspend one day to earn a little more the next.
Spent $15? +$12 for tomorrowReset the PaceIf you fall behind, recalculate the daily limit on what is left.
$400 left, 20 days = $20/daySeparate Your Accounts
Bills AccountKeep bill money in its own account on autopay.
Account 1: bills onlySavings AccountSend savings to a separate bank or labeled bucket.
Account 2: savings onlySpending AccountLeave only the one number in the account you spend from.
Account 3: your $800 to spendUse the Bank AppMany banks show a safe-to-spend figure that tracks this for you.
Bank safe-to-spend = same ideaCheck Mid-Month
Watch the BalanceYour spending balance is simply the number you have left.
Balance = what is left to spendAdjust the PaceSlow down for the rest of the cycle when you run ahead.
Over pace? Cut back this weekReset Each CycleRecalculate the whole number every payday.
New cycle = new spend numberSweep ExtraMove anything left at cycle-end into savings, not next month's fun.
Leftover -> savings, not rolloverTips
- Move bills and savings to a separate account first, so the money in your
spendingAccounttruly equals your safe-to-spend number. - Divide the number by the days until payday to get a
dailyLimityou can check against without doing any math.
Warnings
- Do not leave bill money in your
spendingAccount; if bills and spending share one balance, your one number is a lie. - Never forget irregular bills when setting the
spendNumber; a quarterly or annual charge will blow the number if unplanned.
In Practice
Replace a dozen categories with a single safe-to-spend figure.
You take home $3,200 and want the simplest budget possible.
- Subtract bills: $3,200 - $2,000 fixed bills = $1,200.
- Subtract savings: $1,200 - $400 pay-yourself-first = $800.
- Move bills and savings to separate accounts, leaving $800 to spend.
- Find a daily limit: $800 / 30 days = about $27 per day.
You track one number, $800, instead of a dozen categories.
One well-set number can replace an entire spreadsheet of categories.
FAQ
It is the simplest budget: you calculate one safe-to-spend number and track only that. Subtract fixed bills and savings from your income, and what remains is your spendNumber for everything flexible. No category tracking, just one figure.
People who hate detailed tracking but still overspend. If categories feel like too much, one number gives you a single guardrail. Many banking apps now show a safeToSpend figure automatically, which is the same idea built in.
Set money aside for them before you calculate the number. Divide annual costs like insurance or registration by twelve and move that to savings monthly. Then your spendNumber already accounts for them and will not get ambushed.
Check your daily pace. If your dailyLimit is $40 and you are averaging $55, slow down for the rest of the cycle. The one number only works if you look at it before spending, not after.