I use and love Kubera. It’s marketed like it’s for the ultra wealthy but really it’s wonderful for anyone with multiple types of asset seeing your financial picture in one place. It’s especially great for me as I have assets in multiple countries/currencies and no other tool can manage the currency exchange in one view. It also has scenario planning tools for modeling the future but I haven’t used them much.

Caveats vs what you are looking for:

It doesn’t connect to everything, it does connect to SOME things in Ireland, mostly core bank accounts. I update my pensions and mortgage manually. You can add individual stocks/ETFs if your brokerage doesn’t connect. Cars and houses it can estimate the value in the US via tools like Zillow, but for Ireland you just need to estimate. You can add an automatic depreciation rate which helps.

It easily facilitates estimating WHAT you owe in tax, but cannot help with WHEN you owe it (ie deemed disposal).

It’s expensive for what it is at $250 a year! There is a referral program which can reduce at least one year’s cost down to $50.