Foundation
A 7-day cash map
Who should skip this. Readers who already cannot cover this month’s essentials, or who only need the $400 definition.
Open the one-page sheet — print it or fill it on paper. The sheet is the map. This page is the method.
In one sentence
A 7-day cash map is a calendar of money that will actually arrive and bills that will actually leave in the next seven days. It is a timing tool, not a budget personality test.
Why this matters if money is already tight
A month can add up and still fail on Thursday.
Rent on the 1st, a payday on the 5th, a car insurance draft on the 3rd, and groceries on the weekend are not the same event. They are four events. If you only watch the monthly total, the empty week looks like a mystery.
The Consumer Financial Protection Bureau’s bill-calendar tools exist for this reason: due dates and income dates are a separate problem from what you should spend. FourHundred keeps that idea at seven days because seven days is short enough to finish today.
This page does not replace the $400 test. The $400 test asks whether a small shock becomes a carried balance. The cash map asks whether the next week already has a hole before any shock arrives.
The real-cost example
Take-home deposit: $1,900 on Friday the 5th. Rent: $1,400 due Monday the 1st. Auto insurance: $165 drafted Wednesday the 3rd. Groceries and gas before Friday: about $180.
Monthly view. $1,900 − $1,400 − $165 − $180 = $155 leftover. The month works.
7-day view, Sunday the 31st through Saturday the 6th. If checking starts at $220, Monday rent takes the account negative unless rent waits for Friday or cash was already sitting there. The monthly leftover was real. The week still bounced. That bounce is how a good salary becomes a late fee, a returned-payment fee, and sometimes a card balance.
Same dollars. Different clock.
The smallest useful version
Draw seven days. Not the rest of the year.
Step 1 — Starting cash. What is in checking tonight that you can actually spend? Do not count pending deposits you have not seen. Do not count a credit limit.
Step 2 — Inflows for the next seven days. Paycheck, benefits, child support that has a history of arriving, a transfer you already initiated. If it is only hoped for, leave it off.
Step 3 — Outflows you cannot move. Rent or mortgage drafts, insurance drafts, minimum payments already scheduled, medicine, transit to work, food you will buy because the week contains weekdays.
Step 4 — Running total. Start with tonight’s cash. Add each inflow on its day. Subtract each outflow on its day. Circle the first day the running total goes below zero.
Step 5 — One change, not five. If a day goes below zero: move a due date, change when you send rent or a utility if they accept it in writing, or cut an outflow that is not housing, medicine, or work transport. If none of those can happen this week, leave the map for the bills path.
Do not invent income. Do not treat a credit card as an inflow.
A 20-minute setup
- Open the one-page sheet or a piece of paper. Write the next seven dates.
- Write tonight’s checking balance.
- Write each incoming deposit you can name with a date.
- Write each required outflow with a date.
- Run the total down the page. Circle the first negative day.
- Pick one change for that day, or open the bills path.
That is the Foundation. You can repeat it every Sunday. You do not need a new app to start.
Go next
- Housing or utility day already below zero → I may not make this month’s bills
- Leftover dies on a card → My credit card balance is growing
- Week closes and you want a shock absorber → The $400 test
- Pay looks fine and every week still feels like this → I earn enough and still run out
FourHundred is an education tool. It is not personalized financial, tax, or legal advice. This page does not tell you which bill to skip.