Reviewed September 2026.
Your bank app shows two different truths: pending authorizations and posted ledger entries. Spending against the wrong number is a common path to overdraft fees. This guide teaches the balance math and a weekly error scan.
Definitions that decide your available cash
| Term | Meaning | What it does to money |
|---|---|---|
| Ledger / posted balance | Settled credits and debits | Final for that business day (until next post) |
| Available balance | Posted ± holds ± pending authorizations | What the bank will usually allow you to spend |
| Pending debit card auth | Merchant reserved an amount | Reduces available; may differ from final post |
| Pending ACH | Scheduled electronic debit/credit not yet settled | May or may not reduce available (bank-specific) |
| Deposit hold | New check or mobile deposit not fully released | Inflates ledger while available stays lower |
Gas stations, hotels, and rental cars often authorize $50-$500 more than the final ticket. The auth drops when the final amount posts (often 1-7 business days).
How to read one messy day
Example morning balances:
| Field | Amount |
|---|---|
| Posted balance | $1,240 |
| Pending: Hotel auth | -$200 |
| Pending: Grocer | -$64.18 |
| Available balance | $975.82 |
If you spend $1,000 because you trusted the $1,240 posted figure, the bank can decline or overdraft when authorizations settle.
Weekly 10-minute error scan
- Sort transactions by pending first, then posted.
- Match every pending debit to a receipt or known autopay.
- Flag duplicates: same merchant, same amount, two pending lines within 24 hours.
- Watch for preauthorization leftovers older than 7 business days; call the merchant bank desk if a closed hotel stay still holds $200.
- Compare posted fees to the fee schedule (Checking account fees).
- For unknown ACH, use Reg E timelines in Unauthorized ACH debit.
Worked example: $1.00 auth then $47.50 post
| Stage | App shows | Your move |
|---|---|---|
| Day 0 gas auth | Pending $1.00 | Do not assume the fill-up is $1 |
| Day 1 final post | Posted $47.50; $1 auth released | Confirm $47.50 matches pump receipt |
| If both $1 and $47.50 stayed pending 3 days | Available understated | Call bank with receipt timestamps |
Checklist
- Use available balance for debit decisions; use posted for reconciling the month.
- Keep a cushion above pending rent/utility ACHs (Autopay without overdrafts).
- Screenshot holds before travel or car rental.
- Dispute true errors promptly (Dispute a bank fee).
- Revisit how much cash sits in checking vs savings (Checking vs savings split).
Educational only. Available-balance formulas differ by bank. Confirm hold policies in your deposit agreement.