Business & farm

I think we just need to pause here and take a deep breath:

• Most small businesses use the cash method of accounting for a reason; it is much easier to handle accounting wise and more accurately accounts for the true economics of the business.
• As has been noted, if you use an accounting method for more than one year, you must continue to use that method unless you request permission to change.  This is done via completing Form 3115.
• Ok.  As you noted, you may have a lower tax bill in 2019, but what you need to do is take that savings and "bank it" for next year.  That is where many cash basis taxpayers get into trouble; they love the initial savings in tax, but don't "save" the savings for next year.  
• The revenue procedure cited (Rev Proc 2018-31) has been modified or amplified by several later released revenue procedures.  As such, if you still think you want to go down this road, it is highly suggested you either research the accounting method change or consult with a tax professional to ensure that you reference the correct guidance should you complete a Form 3115.
• Additionally, when changing methods, you need to compute what is known as a Section 481(a) adjustment.  This can be tricky, so make sure you either understand how this amount is computed or consult with a tax professional.
• In all honesty, since you know the tax implications of the advances, I believe you should just plan for the tax implications.  You may end up spending more time and $$ attempting to make a change than it is worth.  Plus, as has been noted, you need to continue to use the accrual method and one never knows what the following year(s) will bring.
• Keep in mind, all response are based on very limited facts and understanding of your specific situation, so once again, having a one on one with a tax professional may be $$ well spent.