The ProPublica Free Tax Guide What Are 2019’s Tax Brackets, and Who Gets Audited the Most? Knowing your income is just the first step to understanding how much you will be taxed.

Americans have left nearly $1.5 billion in refunds on the table for the 2019 tax year, the IRS estimates, with a median refund of about $890.

Most changes under tax reform were implemented for 2018 taxes, but watch for these tweaks including changes to the medical expense deduction, individual mandate penalty and alimony deduction.