To really be able to prepare your forms and see how things are changing and moving, the desktop feature is better. It has the 3115 and you can work on it in Forms mode and be sure your taxes are what you want to reflect.
The IRS used to allow you to mail the 3115 anytime. The laws changed and now you have to pay a penalty if it isn't with your return. To make it part of your return:
- File it with the 8453 (a form for e-filing return attachments)- not sure you can e-file since we don't efile 3115.
- Mail in your return
Filing the 3115 opens up the audit years on the property as well. Since you are correcting this quickly and willingly, that goes a long way.
Personally, I would use the desktop and mail it in with tracking, no signature. At the end of the day, you can use the online version but integrating it with the form seems more challenging to me. This is your return and you get to make the choices.
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