How do i mail my returns?

If they will fit in a regular envelope, you can use a regular envelope.

One suggestion--use a mailing service that will provide you with a receipt or tracking so you know the IRS got your tax return.  It takes up to 4 weeks to see your return status on the IRS site when you mail in your return.

To send your tax return by mail and get a receipt to see that the IRS received it:

https://www.usps.com/taxes/welcome.htm

To track your Federal refund:   

https://www.irs.gov/refunds

To track your state refund:    

https://ttlc.intuit.com/questions/1899433

On the IRS site you are also offered the use of an app called IRS2Go

can i use a manilla envelope to send my income tax return?