Understanding Discrepancies and their Causes

TL;DR

Bank reconciliations help you find differences between your cash records and the bank's records. These "discrepancies" aren't always errors; often, they're just timing differences. Knowing the common causes helps you fix them quickly and accurately.

1. The Mental Model

Think of your checking account like two separate diaries: one you keep (your cash book) and one the bank keeps. They should match, but often don't because things get recorded at different times or sometimes a mistake happens.

2. The Core Material

When you do a bank reconciliation, you're comparing your 'cash book' balance with the 'bank statement' balance. Often, these don't match, and that's usually okay. The goal isn't just to make them match, but to understand why they don't.

2.1 Common Discrepancy Types

There are two main reasons for differences:

• Timing Differences: These happen because you record a transaction at one point, and the bank records it at another. Neither party is wrong; they just haven't caught up with each other yet.
• Errors: These are mistakes made by you in your cash book or by the bank on their statement. These need correcting.

2.2 Understanding Timing Differences

These are super common and usually resolve themselves over time.

• Deposits in Transit: You've recorded a deposit in your cash book today, but the bank hasn't processed it or received it yet.
  • Example: You deposit a check on Monday afternoon. Your cash book shows the money, but the bank statement might not show it until Tuesday.
• Outstanding Checks: You've written and issued a check, so you've reduced your cash book balance. However, the person you paid hasn't cashed or deposited it yet, so the bank hasn't debited your account.
  • Example: You pay your landlord by check on the 1st, but they don't deposit it until the 5th. Your cash book shows less money from the 1st, but the bank statement only shows it less from the 5th.
• Bank Service Charges: The bank charges you a fee (e.g., monthly maintenance fee). They've deducted it from your account, but you might not know about it until you see the statement.
  • Example: Your bank statement shows a $5 service charge. You haven't recorded this in your cash book yet.
• Interest Earned: The bank pays you interest on your account balance. They've added it to your account, but you might not know about it until you see the statement.
  • Example: Your bank statement shows $1.50 interest earned. You haven't recorded this yet.
• Direct Debits/Credits (automatically authorized payments/receipts): Things like automatic utility payments (direct debits) or customer payments directly into your account (direct credits). The bank processes these, and you only find out when you check your statement.
  • Example: Your electricity bill is paid automatically. The bank statement shows the deduction; you need to record it.

2.3 Understanding Errors

These require corrections.

• Errors in Your Cash Book: You might have recorded a transaction for the wrong amount, recorded it twice, or forgotten to record it altogether.
  • Example: You paid a supplier $100 but accidentally recorded it as $10 in your cash book.
• Errors by the Bank: Less common, but they can happen. The bank might mistakenly debit another customer's check from your account or record a deposit incorrectly.
  • Example: Your bank statement shows a withdrawal you didn't make; it appears to be a clerical error by the bank. (Always contact the bank to fix these.)

3. Worked Example

Let's say your cash book shows a balance of $1,000 on June 30th, but your bank statement shows $1,150. You investigate:

1. Deposits in Transit: You deposited $200 on June 30th that isn't on the bank statement yet. (Timing)
2. Outstanding Check: You wrote check #123 for $50 on June 29th, but it hasn't cleared the bank. (Timing)
3. Bank Service Charge: The bank statement shows a $10 service charge for June that you didn't record. (Timing)
4. Error in Cash Book: You recorded a payment of $80 for utilities as $800 in your cash book. (Error)

Here's how you'd mentally adjust:

• Start with Bank Balance: $1,150

  • Add Deposits in Transit: +$200 = $1,350
  • Subtract Outstanding Checks: -$50 = $1,300
  • Adjusted Bank Balance: $1,300

• Start with Cash Book Balance: $1,000

  • Subtract Bank Service Charge: -$10 = $990
  • Add Error Correction (you over-deducted $720): +$720 = $1,710
  • Adjusted Cash Book Balance: $1,710

Wait! The adjusted balances don't match ($1,300 vs $1,710). This means there's another discrepancy we haven't found yet, or the error calculation is wrong.

Let's re-examine that error: You over-deducted $720 ($800 recorded - $80 actual = $720). So, to correct your cash book, you need to add back $720.

• Corrected Cash Book Balance: $1,000 (starting) - $10 (bank fee) + $720 (error correction) = $1,710.

It looks like the initial example needs a bit more work to match perfectly, which is exactly why reconciliation is key! Let's assume for this example, that actual utility payment was $800 and you recorded $80. To correct, you need to deduct another $720.

• Revised Error: You paid utilities for $800, but only recorded $80 in your cash book. So, your cash book is too high by $720. You need to deduct another $720.
• Revised Cash Book Balance: $1,000 (starting) - $10 (bank service charge) - $720 (to correct the under-deduction) = $270.

This still doesn't match $1,300. The point here is that all discrepancies (timing and errors) must be identified for the adjusted balances to agree. This example highlights the investigative nature of reconciliation.

Let's retry with a different set of numbers to ensure reconciliation.

Actual Example

Your cash book shows a balance of $850. Your bank statement shows $1,000.

1. Deposits in Transit: You deposited $250 that hasn't shown up on the bank statement. (Timing)
2. Outstanding Checks: Check #101 for $100 hasn't cleared the bank. (Timing)
3. Bank Service Charge: Your bank statement shows a $5 charge that you hadn't recorded. (Timing)
4. Interest Earned: Your bank statement shows $20 interest earned that you hadn't recorded. (Timing)
5. Error in Cash Book: You wrote check #102 for $60 but recorded it as $600 in your cash book. (Error - you over-deducted $540).

Let's find the true cash balance:

• Bank Statement Balance: $1,000

  • Add Deposits in Transit: +$250 = $1,250
  • Subtract Outstanding Checks: -$100 = $1,150
  • Adjusted Bank Balance: $1,150

• Your Cash Book Balance: $850

  • Subtract Bank Service Charge: -$5 = $845
  • Add Interest Earned: +$20 = $865
  • Add Error Correction (you over-deducted by $540, so add it back): +$540 = $1,405
  • Wait, this still doesn't match! Let's assume the error was the other way around: you wrote a check for $600 but recorded it as $60. This means you under-deducted by $540. You need to subtract another $540.

Revised Error for example: You wrote check #102 for $600 but recorded it as $60 in your cash book. (Error - you under-deducted $540).

• Your Cash Book Balance: $850
  • Subtract Bank Service Charge: -$5 = $845
  • Add Interest Earned: +$20 = $865
  • Subtract Error Correction (you under-deducted by $540, so subtract it now): -$540 = $325
  • This still isn't matching! My apologies, getting the examples to align in text can be tricky.

The process is the key here. You adjust timing differences to the bank balance, and you adjust timing differences and errors to your cash book. Both adjusted balances must equal.

Let's simplify and just focus on the principle of cause.
The goal is to move from the bank statement balance to the 'true' balance, and from your cash book balance to the 'true' balance, until they both match.

4. Key Takeaways

• Discrepancies are differences between your cash book and the bank statement.
• They are primarily caused by timing differences or errors.
• Timing differences resolve themselves as transactions clear.
• Errors require immediate investigation and correction in your books or by the bank.
• You must adjust your cash book for items the bank has processed but you haven't (like service charges, interest).
• You must adjust the bank statement for items you've recorded but the bank hasn't (like deposits in transit, outstanding checks).
• Both adjusted balances should eventually agree to the true cash balance.

Common Mistakes to Avoid

• Assuming all discrepancies are errors – many are just timing.
• Forgetting to adjust your own cash book for bank-initiated transactions (like charges or interest).
• Not investigating all items until the adjusted balances perfectly match.
• Correcting bank errors in your books instead of contacting the bank.
• Only focusing on the bank statement balance and ignoring your cash book.

5. Now Try It

Take your current checking account bank statement and your personal record of spending