Monitoring fee

That would make sense if your state/county allows taxing bodies to tax services and not just goods.  Not all do.

It's the sales tax.  It was discussed here pretty thoroughly last year.  I think SS even made some sort of announcement but I'm not sure.

Same happened to me here in Florida today.
So I guess it was far too much effort for Simplisafe to notify users that this was changing?  JERKS!!!!!

This is not SimpliSafe's doing. They merely have to obey the laws.

This is the effect of a 2018 Supreme Court ruling that changed the laws regarding tax collection for Internet based deals. Where have you all been that this should be a big surprise?

^  well, it's 2020 now, so there's that.

Because it was unexpected and few people are probably worrying 24/7 which of their internet purchases, subscriptions, etc are going to charge tax now, so when there's an unexpected additional charge on a recurring subscription, it comes as a surprise when there's no notification what the additional charge was for.

And, we all know with the problems SS has with a ton of things, a dedicated page for "notices" would serve a purpose, and for a large percentage of their customer base.  We've nudged them countless of times to no avail.

Yes, it would have been a responsible gesture to inform their affected customers that sales taxes are suddenly applicable rather than having us wondering why our credit card is not balancing.  Another example of the erosion of customer service.