If you provide the information the IRS requested, the IRS should correct your account and resolve the refund issue within 60 days.
If you file missing or delinquent returns, the refund issue should be resolved once the IRS processes those returns (within 90 days).
If you file an amended return (Form 1040X), the refund issue should be resolved once the IRS makes the necessary adjustments (within 90 days).
However, if you’re facing serious financial difficulties and need your refund immediately, contact the Taxpayer Advocate Service.
If you don’t provide the information or file the missing returns, your refund will be delayed longer.