When will I get my tax return, I sent it about a month ago, not sure if it goes to my bank account or goes thro a check in the mail?

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The IRS says they send refunds in 21 days for 9 out of 10 efiled returns. The date is an estimate, an educated guess, a rough idea. In other words, it should not be relied on. The IRS can not say how long that other 1 of the 10 will take. All you can do now is, wait. Wait for the pay off of your interest free loan to the government. Did you believe that the IRS is omnipotent, omnibenevolent and omniscient ?

  Check out https://www.irs.gov/wheres-my-refund