1. Confirm it's actually a transfer first. A genuine transfer moves money between two accounts you own and have set up in QuickBooks, business checking to a business savings account, for example. If money is leaving the business entirely (paying a vendor) or entering it from outside (a customer payment), it's an expense or income, not a transfer, even if it moves through what looks like a plain bank-to-bank transaction.
2. Use the Transfer function, not a category. Select + New, then Transfer under the Other column. Don't route this through Expense or Deposit; Transfer is its own transaction type, built specifically for moving money between your own accounts.
3. Pick the accounts and the amount. Choose the account the money is leaving (Transfer Funds From) and the account it's landing in (Transfer Funds To), enter the amount and date, then save.
4. Match it in the bank feed if both accounts are connected. When both the source and destination accounts feed into QuickBooks, the same movement often shows up twice, once as money out, once as money in. QuickBooks usually recognizes this and offers a Transfer match instead of two separate Add actions; take that option rather than adding both sides as unrelated transactions.
5. Leave the category field alone. A transfer doesn't need, and shouldn't get, an expense or income category. Categorizing it as something else is the single most common way a transfer ends up inflating or distorting your profit and loss by mistake.