Did you have unemployment benefits? If so, DO NOT amend your return. The IRS is going to recalculate your tax return for the $10,200 unemployment exclusion and send you a refund. (You still have to pay the amount you originally owed, if you have not paid it already.) It might take several months to get the refund. For details see the following announcement, which the IRS just issued yesterday (March 31).
IRS to recalculate taxes on unemployment benefits; refunds to start in May
