Should I file extension even if I owe taxes this year?

[DS30]

You can file an extension even if you own taxes. However, you will have to pay a late payment fee and interest on any amount due after April 17th, 2018

https://ttlc.intuit.com/replies/4159821

[jay993999399]

how much will the late fee and the interest be in this case?

[DS30]

it depends on the amount owed. Interest is amount 4%. ?The late payment penalty is 0.5% (1/2 of 1 percent) of the additional tax owed amount for every month (or fraction thereof) the owed tax remains unpaid, up to a maximum of 25%.