The Formulas Behind Bank Reconciliation
The calculator applies two separate adjustments to arrive at reconciled balances:
Adjusted Bank Balance = Ending Bank Statement Balance - Outstanding Checks + Deposits in Transit + Bank Errors
Adjusted Book Balance = Ending Bank Statement Balance - Your Errors
Reconciliation Health = (1 - |Adjusted Bank Balance - Adjusted Book Balance| / Ending Balance) x 100
Outstanding checks reduce the bank balance because the cash has left your books but not the bank.
Deposits in transit increase it because the bank has not yet credited them.
Bank errors correct the bank's mistakes, while your errors correct your own records.
Worked Example: Small Business Reconciliation
Consider a business with a $5,000 ending bank statement balance, $800 in outstanding checks, $400 in deposits in transit, a $50 bank error, and $20 in book errors:
| Item | Amount |
|---|---|
| Ending Bank Statement Balance | $5,000.00 |
| - Outstanding Checks | -$800.00 |
| + Deposits in Transit | +$400.00 |
| + Bank Errors | +$50.00 |
| Adjusted Bank Balance | $4,650.00 |
| Item | Amount |
|---|---|
| Ending Bank Statement Balance | $5,000.00 |
| - Your Errors | -$20.00 |
| Adjusted Book Balance | $4,980.00 |
The $330 discrepancy (books higher than bank) produces a 93% reconciliation health score.
To reach 100%, you would need to identify and resolve the remaining timing differences or errors causing that gap.
When Reconciliation Health Drops Below 70%
If outstanding checks jump to $2,000 with all other inputs unchanged, the adjusted bank balance falls to $3,450 while the book balance stays at $4,980 — a $1,530 gap and only 69% health.
This typically signals unrecorded transactions, duplicate payments, or checks that should have cleared weeks ago.
Investigate by matching each outstanding check to its payee and date, and confirm deposits in transit with bank confirmation receipts.
