I done retroactive corrections, and my CPA warned that it will invite tax audits.

I'm also hoping to get another property before the end of the year that won't have much time to bring in any income but will need the same outfitting.Going through this with the tax advisor last week, he strongly urged me to consider just carrying the losses forward, if I even had any, since they would be small compared to the cost of an audit and a one-time artifact of the startup processes.  

Any app will require some type of auditing....apps don't know if your trip is for business or personal usage...but they keep up with the milage for you. 

Some great resources would be here on BP, passive pockets, SEC edgar site (for example you can review Regulation A fund offerings as well as their financial statements to understand how to read audited financials).

However I understand we'd be at high risk of audit if we go through with it.PS.

The IRS is very stringent on education and research hours, and have shown in several tax court cases that people who just "manage the manager" will not pass the audit.

I have faced this for many years and has not been an issue (yet), and survived the scrutiny of an audit.

I work in audit, so I do all the due diligence before the tax work is done.

Not a CPA or tax professional.I’ve never audited every single line item of my S-Corp tax returns for over 18 years, and I’m truly curious why it really matters in one years instance, what corporate account was used to conduct business, as long as the financial information is accurate and correctly reported from said dedicated business account.This should be a separate issue from proper and legally correct business operations, ie a checking account with correct tax ID, no outside commingling of funds with self or other business entity.

IT was a guy who was a sailor of some kind I believe, and he had witnesses attest to his hard work that allowed him to challenge the audit result successfully.