I like to split off the sales tax from purchases (because I'm insane). Splitting transactions one-off makes this trivial but when it's a recurring subscription that also charges sales tax, accounting for this involves having to both make a splitting rule to recategorize the sales tax amount and then create two separate recurring items/rules to apply to the now-split separate transactions. I accept this is abnormal so I'm fine with the extra effort involved in setting this up how I want (and am just grateful it's possible at all with how powerful the rules engine is). But I can already tell the end result is going to leave my Recurring Items page a bit cluttered because the same effective recurring charge is going to be represented twice each time if it's taxed (and at least twice if it's something I want to split for some other reason). Allowing recurring transactions to be grouped by merchant in the way you can already group by category, account, etc. would solve this.