Salary lands. The number in your account is the biggest it will be all month. For about two days you feel comfortable, and then you spend like someone who has that much money, because the app told you that you do.
The app is wrong. Not about the balance, which is correct, but about what it means. Most of that money is already committed. It belongs to rent, to school fees, to the data bundle, to the subscription that renews on the 14th and to the person you owe. It is sitting in your account the way a parcel sits in your hallway: present, and not yours.
The useful number is what is left after everything already spoken for. Here is how to work it out.
The arithmetic
> Safe to spend = income − committed bills − subscriptions − money set aside for goals − a safety buffer.
Five terms. Each one is a question most people can answer in about ten minutes, and almost nobody has ever sat down and answered all five at once. That is the entire reason the number feels like a revelation when you first see it.
Income is what actually lands, not what you are owed and not what you are promised. If part of your income is irregular, use what you can count on rather than a good month.
Committed bills are the ones that arrive whether or not you think about them. Rent, fees, electricity, transport, food at the level you actually eat, the family contribution that is not optional. If you would be in trouble for not paying it, it is committed.
Subscriptions get their own line because they behave differently. They are small, automatic, and they renew whether or not you used them. Five of them at ₦3,000 is ₦15,000 a month leaving without a decision.
Money set aside for goals is the part people leave out, and leaving it out is why saving feels impossible. If rent is due in nine months, a ninth of rent belongs to next month's rent, not to this month's spending. More on that in the piece on lumpy bills.
A safety buffer is what stops one surprise from undoing the whole month.
What remains is genuinely yours. You can spend all of it without consequence, which is the point. A number you can spend guilt-free is more useful than a budget you break.
Why the famous percentage rules do not survive contact with Nigeria
You will have seen 50/30/20: half to needs, thirty percent to wants, twenty to savings. It is a decent teaching device from an American book, and it assumes four things that are not true here.
It assumes bills are monthly. Nigerian rent is commonly a year in advance. School fees are termly. Neither divides into a tidy monthly slice unless you make it divide, deliberately.
It assumes prices hold still. When inflation is running the way it has been, the naira cost of "needs" moves under you during the year. A percentage fixed in January is describing a different basket by June.
It assumes a steady salary. Traders, artisans and anyone with a commission or a seasonal trade have a monthly income that is a range, not a figure.
It assumes needs are compressible. Below a certain point, cutting needs is not budgeting. It is going without, and percentage rules have nothing to say about what to do when 50% does not cover the things you cannot not buy.
The arithmetic above does not assume any of that. It asks what your bills actually are, in your actual month.
Doing it by hand, once
Take a sheet of paper, or the back of a receipt. One month.
| | ₦ | | --- | --- | | What lands this month (be conservative) | | | Rent, divided into a monthly share | | | Fees, divided into a monthly share | | | Electricity, fuel, gas | | | Transport | | | Food | | | Data and airtime | | | Family and obligations you will not skip | | | Every subscription (list them, do not estimate) | | | Debt repayments | | | Set aside for goals | | | Safety buffer | | | What is left | |
Two things usually happen the first time someone does this.
The subscription line is larger than expected, because nobody remembers all of them until they are written in a column. And the bottom line is smaller than expected, which is uncomfortable for about a minute and then useful for the rest of the year, because you were already living on that number. You just did not know it, so you spent against a bigger one and made up the difference with anxiety.
Sizing the buffer
The buffer is not savings. Savings have a purpose; a buffer's purpose is to absorb the month being slightly worse than expected. A tyre. A hospital visit. A price that moved.
A month of committed bills is the usual target, built up over time rather than found at once. If that sounds impossible right now, start with whatever one week costs. The point of a buffer is not its size, it is that a small shock stops reaching your spending at all.
If you are already carrying debt at a high rate, the buffer competes with clearing it, and the answer depends on the rate and on how exposed you are to surprises. There is no single right order, but there is a wrong one, which is having neither because you were waiting to decide.
The number moves, and that is correct
This is not a monthly ritual to be performed and filed. The moment a bill changes, the number changes. Rent goes up, a subscription renews at a new price, a client pays late: all of it lands on the same line.
A spendable figure that you calculated in March and are still using in September is describing a month that no longer exists. That is the argument for something that recalculates it as things change, rather than a spreadsheet you update when you remember.
What this actually buys you
Not restriction. Permission.
Most people manage money by feeling vaguely guilty about all of it, which is exhausting and does not work, because guilt is not a budget. Knowing the number replaces that with something simpler: this much is committed, this much is free, spend the free part.
The best math you can learn is how to calculate the future cost of current decisions. This is the smallest version of that, done once a month, and almost everything else in personal finance gets easier downstream of it.
Kampe computes this number continuously from your accounts, bills and subscriptions, and shows the itemised breakdown rather than only the total, so you can see exactly what is claiming your money before you disagree with it.
Next: rent in advance, school fees and December, which is the line above that most people get wrong.