Why Banks Ask for Your 6-Month Average
Your 6-month average balance is the total of your account balance on specific dates over the past six months, divided by the number of those dates. Banks use this number to decide whether you meet the minimum balance requirement for certain account types, to waive monthly fees, or to determine what interest rate you earn. It is different from your current balance — it smooths out the ups and downs in your account over time.
Some banks calculate this automatically and show it to you in your account dashboard. Others require you to calculate it yourself, especially if you are moving to a new bank and need to prove your history. Knowing how to do it yourself protects you from errors and helps you understand whether you actually meet a bank's stated requirement.
Key Takeaways
- Six-month average balance is the sum of your balance on specific dates divided by how many dates you measured — typically the last day of each month for six months.
- You can find historical balances in your online banking portal, paper statements, or by calling your bank's customer service line.
- Some banks measure on the last day of each month; others use daily averages or a different schedule — check your account agreement to know which method applies to you.
- If your balance fluctuates widely, a six-month average may be higher or lower than your current balance, which affects whether you avoid fees or earn higher interest.
The Basic Calculation: Last-Day-of-Month Method
The most common way banks calculate six-month average is to take your account balance on the last day of each of the past six months, add those six numbers together, and divide by six. This method is straightforward and works with the statements you already receive.
Here is the step-by-step process:
- Gather your account balance for the last day of each of the past six months. If today is March 15, you need the balances from September 30, October 31, November 30, December 31, January 31, and February 28 (or 29 in a leap year).
- Add all six balances together.
- Divide the total by six.
Example: If your balances on the last day of each month were $2,500, $2,800, $2,200, $3,100, $2,900, and $2,400, your calculation would be ($2,500 + $2,800 + $2,200 + $3,100 + $2,900 + $2,400) ÷ 6 = $2,650.
Finding Your Historical Balances
You need accurate balance figures from the past six months. Your bank stores this information in multiple places, and which one you use depends on what access you have and how far back you need to go.
Online banking portal: Log into your account and look for a "Statements" or "History" section. Most banks let you download or view statements going back 12 to 24 months. Each statement shows your balance on the date it was generated, usually the last day of the month. This is the fastest route if you have online access.
Paper statements: If you receive statements by mail, the balance appears on the front page or in a summary section. Stack them in order and write down the balance from each one. If you are missing a month, call your bank to request a duplicate.
Customer service: Call your bank's customer service number and ask for your account balance on specific dates. Have your account number ready. Some banks charge a small fee for this service if you request more than a few months of history, though most waive it for recent months.
When Your Bank Uses a Different Calculation Method
Not all banks use the last-day-of-month method. Some use a daily average balance, which requires you to add up your balance for every single day over six months and divide by the total number of days. Others measure on the first day of each month, or use a rolling 90-day average instead of six months. Your account agreement or the bank's fee schedule will state which method they use.
If your bank uses daily average balance, you have two options: ask the bank to calculate it for you (they are required to provide this information), or download your transaction history and calculate it yourself using a spreadsheet. The spreadsheet method is tedious but accurate — you enter each day's balance in one column, sum the column, and divide by the number of days.
Before you spend time calculating, check your account agreement or call your bank to confirm the exact method. Many banks now display your average balance directly in the online portal, which saves you the work entirely.
What to Do If Your Balance Fluctuates Widely
If your paycheck arrives on the 15th and you pay bills on the 20th, your balance may swing from $5,000 to $1,500 within days. A six-month average smooths out these swings, but it can still be misleading if you have one very high or very low month.
If you are trying to meet a minimum balance requirement to avoid fees, calculate your average honestly and compare it to the bank's threshold. If you are close but below it, you have two choices: deposit more money to raise your average going forward, or switch to an account type with a lower minimum. If you are trying to earn interest based on your average balance, remember that the rate applies only to the average amount, not your full balance — so a $2,650 average earns less interest than a $5,000 balance would, even if your current balance is $5,000.
Calculating Average Balance When Switching Banks
When you open a new account at a different bank, you may need to prove your six-month history to meet their requirements or to transfer a promotional offer. Your old bank will provide this information if you request it in writing or by phone.
Ask your previous bank for a letter stating your average balance over the past six months, or request copies of your last six statements. Bring these to your new bank. Some banks will calculate the average themselves using the statements you provide; others will accept the letter from your old bank as proof. This process usually takes three to five business days.
If you closed your old account more than a few months ago, the bank may charge a fee to retrieve historical statements, typically $10 to $25. Ask about the fee before you request the information.
Common Mistakes to Avoid
The most common error is using your current balance instead of your average. Your current balance is a single point in time; your average is a trend. If you just received a large deposit, your current balance may be much higher than your six-month average, which means you do not actually meet the requirement yet.
Another mistake is including the wrong months. If you are calculating on March 15, do not include March in your average — use only the six complete months before this one (September through February). Some banks measure from the first day of the current month, so check your account agreement to be sure.
A third error is forgetting to divide by six. Adding up six months of balances gives you a total, not an average. You must divide by six to get the true average.
Frequently Asked Questions
Does my bank calculate the six-month average for me?
Many banks display your average balance in the online portal under account details or statements. Check your account dashboard first. If it is not there, call customer service and ask them to calculate it for you — they have access to your full history and can provide the number in minutes.
What if I do not have six months of statements because I just opened the account?
Use the months you have. If you opened the account three months ago, calculate the average of those three months and divide by three instead of six. Once you have six months of history, recalculate using the full six-month method. Some banks waive minimums for new accounts during the first few months anyway.
Can I use my average balance from a different bank to meet a requirement at a new bank?
Yes, if the new bank accepts it. Bring a letter from your old bank or copies of your statements. Some banks will verify the history directly with your previous bank. Call ahead to ask what proof they need before you request documents from your old bank.
If my balance was negative one month, does that count as zero or as a negative number?
It counts as a negative number in the calculation. If you were overdrawn by $200 one month, that month contributes -$200 to your total. This lowers your average, which is why overdrafts hurt your ability to meet minimum balance requirements.
How often should I recalculate my average balance?
Recalculate whenever you need to know your current standing — before applying for a new account, when checking whether you may have access to for a fee waiver, or if your bank asks you to verify it. If you calculate once a month on the same date, you will have a clear picture of your trend over time.