Can you calculate and pay the interest due in between April 15th and the Tax Extension filing in October?

[davsea17]

I'm wondering, If I owe for example 2,000 in taxes, but can only pay 1,000 by april 15th, and file an extension.....I'm aware that of course there is interest on the amount unpaid.

But let's say I pay 1,000 by april 15th and then pay the other 1,000 by August 15th, could I include extra in that final payment if I calculate the late payment interest penalty?

Thanks!

[rjs]

Don't try to calculate the penalty and interest. (They are two separate amounts.) Let the IRS bill you for them. The calculations are complicated, so you probably won't get it right. And it depends in part on the exact date that the IRS receives your payment, which you may not know.

[davsea17]

Thanks!