How to Know What's Safe to Spend After Bills

Your bank balance tells you what's in the account right now. It doesn't tell you what's already spoken for. The more useful number is what's safe to spend: the money left after the bills you still have to pay this month.

The basic math

Safe to spend = current balance − bills still due this month

• Current balance. Start from what's in the account today, not what you earned this month. Income you've already spent isn't available.
• Still due. Only count bills that haven't come out yet. A bill that already cleared is already reflected in your balance.
• This month. Keep the window clear. Look at next month separately (see below).

If you've committed to saving a set amount this month, you can hold that back too, like a bill you pay yourself. Use this month's contribution, not your total savings. Money you've already saved is part of your balance.

An example (illustrative numbers)

It's the 12th and your checking account has $1,850. Rent already came out on the 1st. Still due:

• Car payment: $380
• Electric: about $110
• Phone: $65
• Streaming: $28

$380 + $110 + $65 + $28 = $583 still due, so $1,850 − $583 = $1,267.

That $1,267 isn't all free money. It still has to cover groceries, gas, medicine and other essentials until your next paycheck. Subtracting bills only tells you what's left after bills, not what's left after everything. If money is tight, list your essentials for the rest of the month and treat them like bills too.

Three mistakes that skew the number

Starting from income. "I make $4,000 and my bills are $2,200, so I have $1,800." That's true on the 1st. By the 20th it ignores everything you've spent since.

Forgetting irregular bills. Annual subscriptions, car registration and insurance paid twice a year are easy to forget because they're rare. Put them on your list with their real due dates.

Subtracting bills that already cleared. Your balance already reflects them. Counting them again makes you think you have less than you do.

If the number comes out short

Sometimes the bills still due add up to more than you have. A negative number is hard to act on. Knowing exactly how short you are is easier: "$140 short before the electric bill" is something you can plan around. You can:

• Move money over from savings, if you have it
• Ask the company whether you can move a due date
• Pause a subscription for a month
• Cut back on flexible spending until payday

The point is to find out on the 12th, not on the 20th when a payment fails.

Look ahead to next month

Late in the month the number can look great because most bills are paid. But rent may be due on the 1st, before your next paycheck lands. In the last week of the month, check which bills hit in the first days of next month and keep enough back to cover them.

A five-minute weekly routine

1. Check your current balance.
2. List the bills still due this month.
3. Subtract. That's your safe to spend, before day-to-day essentials.
4. Late in the month, check what's due early next month.
5. If you're short, decide now what you'll move, pause or ask about.

Doing it with BUCK

A spreadsheet works if you keep it updated. We built BUCK so you don't have to. BUCK is our app, on iPhone and on the web, for people in the U.S. What it does:

• Safe to spend is the big number on Home: your balance minus the bills still due this month, with your current balance right under it. The Budget screen shows the math.
• No scary negatives. If bills are more than you have, BUCK shows $0 in amber and how short you are.
• Bills mark themselves paid when the payment lands in your connected bank.
• A "Next 30 days" line, and a heads-up late in the month if next month's first bills are more than you have safe to spend.
• Bill reminders three days before a bill is due, even before you connect a bank.

BUCK's number covers the bills you add (and, on Pro, this month's goal contributions). It doesn't budget groceries or gas for you, so keep those in mind.

BUCK is free with one bank account and up to 3 bills and 3 goals. BUCK Pro is $9.99 a month or $99.99 a year. Download BUCK on the App Store or compare options in The Best Bill Tracker Apps.

FAQ

What is the money left after bills called?
People call it "safe to spend," "money left after bills" or "what's left to spend." It's what you can spend without putting a bill at risk.

Is my bank's available balance the same as safe to spend?
No. Available balance accounts for pending transactions, but it doesn't know about next week's car payment.

How often should I recalculate?
Weekly works for most people. Check more often when money is tight.

What if I'm paid every two weeks?
Use the same math, but count the bills due before your next paycheck.

Do I need to connect a bank?
No. You can do this by hand. In BUCK you can add bills and get reminders before connecting a bank. Connecting one lets BUCK read your balance and mark bills paid.