First, let me say that I do NOT recommend sending them all in the same envelope. It may be a little more postage, however, processing one at a time has been a better experience in my option.
1. Send the three returns to the 2018 address with a cover letter indicating that the reason why they are all sent there is so that they are processed in order.
- No. Use the current address for each year and send them individually. One year, one envelope. I also recommend you send them with delivery confirmation or certified receipt.
2. Send each of the returns to the address specified with a cover letter for the "2019 amend department" saying, "make sure the 2018 amendment is processed first" and a cover letter for the "2020 amend department" saying, "make sure the 2019 amendment is processed first."
- A cover letter can be a good idea, but again, my recommendation is to send them individually to the current address. It really doesn't matter what year is processed first. If there are questions they will send a letter.
As we all know at this moment, based on the news, the IRS is behind. The calls are long with no guarantee that you will reach a live person. The other option is to take all of the returns to a local IRS office. I'm not recommending this, it is strictly your option.
The address for the California state tax return, unless specifically stated that a certain year should go to an address, file them using the most recent tax return address.
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