[froindt]

My understanding was they don't pay interest on tax refunds, but you pay interest on unpaid tax liabilities.

Do you have a source handy? My Google-fu is failing and only bringing up interest on unpaid taxes.

[tarlinian]

If the refund is paid in less than 45 days after the tax filing deadline or the day you file your taxes, they will pay you interest. See here: https://www.irs.gov/payments/interest#pay

[Rebelgecko]

Within the last few years I got a couple hundred bonus bucks back from the IRS as interest. Might've been a year where they were overhelmed and took significantly longer to cut the check that usual