The IRS needs a current address to send you any refunds and correspondence. It can take up to 6 weeks to process a change of address. Most people use IRS Form 8822 to change their address, but there are a couple of other methods too.
If you move after you file your taxes, you’ll need to complete the IRS form. If you move before you file your taxes, your new tax returns will reflect the new address, but you must take other precautions too.