Your bank app says you have $8,400 available. Your own books say you have $5,100. Both numbers are "correct" — and if you spend based on the wrong one, you will bounce a payment that your balance told you was covered. That gap has a name: float. It is the window between the moment a payment is made and the moment the money actually moves, and during it the same dollars show up on two ledgers at once.
Float used to be measured in weeks. A check mailed across the country in the 1980s could take ten business days to clear, and corporate treasurers built entire strategies around the lag. Electronic clearing has compressed the window to hours in many cases, but it has not eliminated it. Checks still move billions of dollars a year in the United States, and every one of them creates float. If you write or receive checks — vendor payments, rent, customer remittances — you need to understand the three kinds of float, how each one distorts your cash position, and the one mistake that turns a timing difference into an overdraft.
What Float Actually Is
Strip away the jargon and float is simple: it is money in transit. When you mail a $2,000 check to a supplier on Monday, your checkbook records the payment immediately, but your bank has no idea the check exists until the supplier deposits it and the clearing system presents it back to your bank. Until that happens, your bank balance overstates your cash by $2,000.
The mirror image happens on the receiving side. When a client mails you a $2,000 check, you record the receipt in your books, but you cannot spend that money until the check clears and your bank releases the funds. Your book balance overstates your spendable cash by $2,000.
Finance textbooks define float as the difference between the cash balance on a firm's books (book cash) and the cash balance at the bank (bank cash). During the float window, the same money is counted twice: it sits in the payer's available balance because it has not been debited yet, and it sits in the payee's books because it has been recorded as received. Neither side is wrong. They are just looking at different moments in the same journey.
This matters because the two balances answer different questions. Your book balance tells you what you own after accounting for everything you have committed. Your bank's available balance tells you what the bank will let you spend right now. Confusing the two is the root of nearly every float-related cash mistake.
The Three Kinds of Check Float
A traditional check payment walks through three distinct delays, and each one has a name. Together they make up the total float on a check.
Mail float
Mail float is the time between dropping a check in the mail and the recipient physically holding it. It is the crudest component — pure postal transit — and historically the longest, sometimes five to seven days each way.
For the payer, mail float is invisible money: the check has left your desk and your books, but nothing has happened at the bank. For the payee waiting on the payment, mail float is dead time before the collection process even begins. Electronic payments killed mail float entirely, which is one reason businesses that switched to ACH and wire transfers saw their cash forecasting get dramatically easier.
Processing float
Processing float begins when the recipient holds the check and ends when the deposit is in the banking system. It covers everything the payee does: opening the envelope, matching the check to an invoice, endorsing it, filling out a deposit slip, and getting it to the bank — plus the bank's own internal logging of the transaction.
This is the component most within your control. A customer check that sits in an inbox from Friday to Tuesday generates three days of processing float that better habits would eliminate. Businesses once attacked this with lockbox systems — post office boxes near their customers where a bank collected and deposited remittances daily, cutting both mail and processing float. Today the equivalent is remote deposit capture: photographing the check with a phone the moment it arrives, which collapses processing float to minutes.
Availability float (clearing float)
Availability float — also called clearing float — is the final leg. The recipient's bank has the deposit, but the funds still have to travel: the depositary bank sends the check data to the payer's bank through the Federal Reserve or a private clearinghouse, the payer's bank verifies and debits the payer's account, and only then are the funds truly settled.
Federal law caps this leg. The Expedited Funds Availability Act, implemented through Regulation CC, sets maximum hold times on deposited funds: banks must generally make the first $275 of a check deposit available by the next business day, with the remainder available by the second business day for most checks. The bank releases funds to you on that schedule even though the check itself may still be working its way back to the payer's bank — a gap that matters enormously, as the section on kiting below explains.
Collection Float vs. Disbursement Float
So far we have looked at float from one check's point of view. Businesses look at it from their own point of view, which produces two aggregate measures.
Disbursement float is generated by the checks you write. Writing a check decreases your book balance immediately with no change in your bank balance, so your available balance is higher than your book balance. Disbursement float helps you: while it lasts, your bank balance overstates what you have committed, which means cash stays available longer.
Collection float is generated by the checks you receive. Recording a received check increases your book balance before the bank credits your account, so your available balance is lower than your book balance. Collection float hurts you: your books say money has arrived that you cannot yet spend.
Net float is the sum of the two: disbursement float plus collection float (with collection float being negative from your perspective). Equivalently, it is the overall difference between your available balance and your book balance at a point in time. A positive net float means disbursements in transit exceed collections in transit — your bank balance reads higher than your books. A negative net float means the reverse.
Textbook cash management says to maximize disbursement float and minimize collection float: pay by check from a distant bank, collect electronically into a local one. In practice, modern clearing has shrunk both numbers so much that the textbook games are barely worth playing — but the accounting discipline behind them still matters. A business should manage to its net float and available balance, not its book balance, when deciding what it can spend.
How Check 21 and Remote Deposit Shrunk Float
Two innovations did most of the shrinking, and understanding them explains why float behaves the way it does today.
The Check Clearing for the 21st Century Act — Check 21, effective 2004 — let banks transmit digital images of checks instead of flying the physical paper around the country. Before Check 21, clearing a check drawn on a distant bank meant putting the actual piece of paper on an airplane; after it, the depositary bank captures an image and sends the data electronically, creating a "substitute check" only if a paper copy is ever needed downstream. Clearing times fell from days to typically one business day.
Remote deposit capture finished the job on the front end. Once a check could clear from an image, there was no reason the image had to be captured at a branch — a scanner or a phone camera would do. Depositing a customer check the minute it arrives eliminates processing float almost entirely, and the Check 21 pipeline behind it keeps availability float short.
But notice what neither innovation touched: the payer's side. Your bank still does not know your check exists until it is presented. Mail float on outgoing checks survives whenever you mail paper, and the gap between "check written" and "check presented" can still stretch for weeks if the payee is slow to deposit. Float shrank asymmetrically — collections got fast while disbursements stayed lazy — which is exactly why the cash-position mistake in the next section still bites.
The Cash-Position Mistake Float Still Causes
Here is the mistake: spending your bank balance instead of your book balance.
Imagine your bank shows $8,400 available on Monday morning. What it does not show is the $2,300 vendor check you mailed Friday, the $800 rent check your landlord deposits on the first of every month, and the $200 utility check floating somewhere in the postal system. Your real position — money you actually still own — is $5,100. If you authorize a $7,000 equipment purchase against the $8,400, everything clears until the outstanding checks arrive, and then something bounces.
Small businesses make this error constantly, for three reinforcing reasons:
- Bank apps show available balance prominently. The number on the home screen excludes checks you have written but that have not been presented. It is accurate as a statement of what the bank will honor right now, and misleading as a statement of what you own.
- Outstanding checks are invisible. Unlike a pending card transaction, an unpresented check appears nowhere in online banking. Out of sight, out of mind — especially for checks mailed weeks ago.
- Deposits feel spendable before they are. Regulation CC's next-day $275 and second-day availability schedule means deposited funds show as available before the underlying check has truly cleared. If that check bounces, the bank reverses the credit, and anything you spent against it becomes an overdraft.
The fix is unglamorous: reconcile early and often. Record every check the day you write it, track outstanding checks as a standing list, and compute your true cash position as bank balance minus outstanding checks plus deposits in transit. That is precisely what a bank reconciliation does — it walks the two balances toward each other across the float window. Businesses that reconcile weekly almost never get surprised by float; businesses that reconcile quarterly get surprised constantly.
One more discipline worth adopting: put a time limit on outstanding checks. A check unpresented after 90 days is usually a problem — lost in the mail, forgotten by the payee, or sitting in someone's drawer. Follow up, and if necessary stop payment and reissue. Stale checks do not just distort your cash position; in most states they eventually become unclaimed property you must report.
Recording Float in Your Books
Float is not just a banking phenomenon; it is a bookkeeping design decision. Your ledger needs to distinguish money that has moved from money that is merely in transit, or your reports will tell the same lie your bank balance does.
In a double-entry system like Beancount, the clean pattern is a clearing account for outstanding checks. When you write the check, you move money out of checking and into the clearing account. When the check clears the bank, you move it out of the clearing account. The clearing account's balance is always exactly your outstanding-checks list — your disbursement float, visible as a number:
2026-10-24 * "Acme Supply" "October materials - check 1847"
Expenses:Materials 2,300.00 USD
Assets:Checking:Outstanding-Checks -2,300.00 USD
2026-10-29 * "Acme Supply" "Check 1847 cleared"
Assets:Checking:Outstanding-Checks 2,300.00 USD
Assets:Checking -2,300.00 USDWith this structure, Assets:Checking always matches what the bank shows, while the sum of checking plus outstanding checks matches your books. Reconciliation becomes a comparison rather than an investigation: any entry lingering in the clearing account is an unpresented check, and the account balance is your disbursement float to the penny. The same pattern works in reverse for deposits in transit — a Deposits-in-Transit account holds customer checks between receipt and availability, making collection float equally visible.
If you use accounting software rather than a plain-text ledger, the equivalent is never deleting a payment to "fix" a balance mismatch. An uncleared check in your software is outstanding float doing its job; deleting it to make the screen match the bank destroys the record of a real commitment. Mark it cleared only when the bank statement says so.
The Line You Must Not Cross
Everything above treats float as a timing difference to manage. There is a version of float management that is a federal crime, and the boundary is intent.
Check kiting exploits the availability schedule: depositing a check from account A into account B, then writing checks against B's artificially inflated balance before A's check clears — sometimes cycling funds through several banks so each ledger looks healthy long enough to withdraw real money. The scheme works only because Regulation CC forces banks to release funds before the paying bank has confirmed the check is good. That mandated gap is the float, and riding it deliberately is fraud.
Banks detect kiting with software built specifically for its footprint — circular deposits, round-dollar transfers between a small set of accounts, balances supported entirely by uncollected funds. Penalties include bank fraud charges carrying years in prison, and prosecutors do not need the scheme to succeed; the kite itself is the crime.
The honest treasurer's version of float management — depositing receipts promptly, choosing payment methods deliberately, forecasting around known clearing times — is not just legal but prudent. The difference is that legitimate management works with money you actually have, while kiting spends money that exists only in the float window. If a cash strategy requires a check to clear before anyone looks closely, it is not a strategy.
Your Next Reconciliation
Float is smaller than it was, but the decisions it distorts are the same ones that have always wrecked small-business cash flow: spending money already committed, counting money not yet collected, trusting one balance when the truth needs two. This week, pull your outstanding-checks list — from your clearing account if you keep one, from your check register if you do not — and subtract it from the number your bank app shows. That smaller number is your real cash position. Manage to it, reconcile against it weekly, and the float window becomes what it should be: a timing difference you can see, instead of a surprise you cannot.
