Sorry, not used v4 custom reports, could help if v5 but many report tags from v5 not available in v4 so putting something together on v5 probably wouldn’t help much.
Your issue will be that tax is generally order based but payment isn’t so payments will not be reportable in terms of tax given multiple payments can be made to a ticket.
Payment type doesnt effect tax does it? So why would you need to if tax was paid by cash or card?
Tax is on sale not on payment…
Also please dont post the same question twice 
or what is pretty much the same question.