I thought you worked for the big three?.....Estimated quarterlies can be paid all at once or quarterly I guess.....hence the term "Quarterly". Anyway, we always pay them all at one time.
Big 4 you mean? Haha, yeah - I come from there.
Yeah, I do - but the one caveat I'll say is that taxation is... well... complex. It's complex to the point where in the Big 4 (and in anyone who CLAIMS to know taxation) that they are split between expertise. Anyone who claims to be an expert in all taxation is a moron who is trying to fool you. They don't exist. Someone might have a good idea of taxation in general, but there is no one who is an expert in overall taxation. It's simply too complex. Hell, when it comes to State/Local taxes (SALT) it is so complex that expertise is down to the state level here in the US. So if we ever had a question on something of a tax in IL, someone would tell you "Yeah, Bob knows IL - give him a call and he can talk to you about that".
In terms of taxation - below are ENTIRE DEPARTMENTS that I can think of when I was going through Big 4
Direct Tax - Deals with tax that directly impacts a company... So Income tax mostly.
Indirect Tax - Any tax that does NOT directly impact a company... So Sales/Use, Excise, etc... It's very broad, so typically people specialize.
Excise Tax - A division of Indirect Tax - but it still gets into more complex topics such as Oil/Gas tax which is based on gallons of fuel, not based on a percentage of goods sold.
Legal Tax Advice - More of a lawyer department instead of an tax department
Tax Audit
Then you get into more niche things like Estate taxes, Inheritance taxes, payroll taxes, property taxes, VAT.... Then you get into global trade with the likes of tariffs... The list just goes on and on. On top of that - there is the concept of collecting the taxes, vs. reporting the taxes (compliance).
Personally, I am well versed in Indirect Tax. That means, Sales/Use Tax, Excise Tax, VAT, etc... These are referred to as
Indirect Tax because the people reporting the tax (Companies) are not the ones the tax is imposed on. It's typically imposed on the general consumer, and the companies remit the taxes to the jurisdiction.
I have a very mid-level grade of knowledge on personal income taxes because a little bit flows over since I file a return every year.... So when it comes to things like Income returns for businesses I legitimately have very little knowledge there.
Since
@Dr. Detroit comes from this type of background as well he can probably clarify better than I can.