hi everyonei am seeing very old balance of my customers which they already paid

Let's collaborate to maintain accurate records in QuickBooks, to ensure payments are correctly applied to invoices, Jadu.

If you recorded the payment through a bank deposit, link it to the invoice to mark it as paid and clear the open invoice balance, preventing it from appearing unpaid on your reports. I'll show you how:

1. Select + New, then choose Receive payment.
2. From the Customer dropdown, select the name of the customer.
3. From the Payment method dropdown, choose a payment method.
4. From the Deposit To dropdown, click the account you put the payment into.
5. Under the Outstanding Transactions section, tick the box for the invoice you're recording the payment for.
6. Under Credits, check the deposit to link it from the invoice.
7. Enter the Memo if needed.
8. When you're done, select Save and close.

Alternatively, if you received a payment but didn't document it in QuickBooks, you can create an adjustment note and associate it with the open invoice to settle the outstanding balance. Here's how:

1. Select + New.
2. Click Adjustment note.
3. From the Customer dropdown, select the customer's name.
4. Enter the adjustment note details, such as the date and the amount.
5. When done, click Save and close.

After that, apply the adjustment note to your open invoice. Here's how:

1. Select + New, then click Receive payment.
2. From the Customer dropdown, select the customer.
3. From the Outstanding Transactions section, select the open invoice you want to apply the adjustment note to.
4. From the Credits section, select the adjustment notes you want to apply.
5. For the open invoice in the Payment column, enter how much of the credit you want to apply.
6. Leave the Payment method, Reference no, Deposit to, and Amount received fields blank and fill out the rest of the form, including the Payment date.
7. Make sure the total is correct after applying the adjustment note.
8. When you're done, select Save and close.

Additionally, by running a sales and member contribution report, you can monitor your performance and make data-driven decisions to enhance sales and achieve your business objectives.

Please know that I'm only a comment or post away if you have any other questions about managing your invoices in QuickBooks Online.