The timing of a withdrawal depends on several factors, including what time of day the withdrawal request is made and the institution receiving your funds, but most withdrawals take 5 or 6 business days before the requested funds will be in your bank account.
When you request a withdrawal from your taxable Acorn account, we will send you an email within one business day to verify that the request is valid. Once you verify your withdrawal request, we will place the trades to raise the required cash in your account. All trades then take 3 business days to settle (This applies to all brokerage firms, not just TD Ameritrade). Upon trade settlement, we will then return your funds via the electronic ACH link to your bank account, which usually takes another 1-2 business days, but can take a day or two longer depending on where the funds are being sent.
Please note that if you request a withdrawal into a bank account which is different than the account that originally deposited the funds into Acorn, that for your security, we may ask you for additional information before returning your funds.