| What is the best way? Mailing in the check? |
| File an extension? |
Even if you file for an extension, you still have to pay what you owe by April 15 or you'll face fines/penalties. |
| postmarked check? |
| Mail it on the 15th. As long as it's postmarked the 15th it is not considered late. It will take another 2-3 to get there and maybe a week before they process it. Don't count count on that but that has been my experience in the past. |
| If you mail the check on 4/15, I would get a receipt or confirmation that it was mailed on that date just to be safe. |
| Penalty for filing late is much greater than the penalty for paying late. Whatever you do, file your return or extension on time. Penalty for paying late is 0.5% of tax owed, per month. So if you owe $1000 and pay 5 months late, your penalty will be $25 (plus interest). By contrast, the penalty for [i]filing[i] late is 5% per month. |
| mail it on april 15 by registered, certified, or overnight mail - anything with a receipt showing irs signed for it. |