The deposit and everything won’t apply to to the guests with confirmed reservations. If you want to collect tax on them, probably best to do is write and tell them that this will be necessary. You’re sorry it wasn’t Disclosed in the listing previously but you wanted to become compliant as of January 1. Some will or won’t comply, and may grumble so be ready for that. I’ve found most people are very compliant with tax collections. I also have my license displayed in the room so that they know I’m not trying to take them for a ride. Are you sure it’s 13%? I paid 14% at the DC hotel, but maybe it was higher because the hotel was inside the city limits.
I make up a small envelope for them to use when they arrive. It has their name, amount of tax and the dates they stay. I tape it to the doorknob so I can grab it as I’m showing them inside. “Oh, this is for your tax.”
If they don’t immediately have it ready, i tell them it is okay to slip it under my welcome mat and I’ll get it later.
With tax you have to remind them a million times about it. When they enquire, when you send the acceptance, when you send the guest info. In fact I put it in the driving instructions. I say, “Your tax for this stay will be ----. Please have this amount ready on arrival.”
The only guests who acted surprised about the tax were the ghastly Canadian couple, but as I’ve told here, they had a bunch of other issues and red flags, and stole supplies from my room.