Tax System
Required Pack: Seasons
Other Requirements: XML Injector
This is a new mod and you will need to delete these two files if you have them in your game (Reminder if you have the merged traditions file, please re-download the new file) but the below files need to be deleted or they will conflict:
KiaraSims4Mods_FileTaxReturn_Tradition
KiaraSims4Mods_FileTaxReturn
Tax System Details
Tax Day Tradition (Sims must have a job and an adult to file taxes.)

This will unlock the Sim-RS Portal
These 3 interactions is where you will start.

File Tax Return - Cost 200 Simoleons to file. Then you will be given a message whether your tax return has been approved, rejected or you may get a neutral return. This will only show during tax day.
Hack Sim-RS Office- You can take a gamble and hack the Sim-RS office. It may or may not impact your tax return. This interaction stays even if it's not a tax day, so you can always hack the Sims-RS office.
Review Tax Expenses - Review your tax expenses before you file the tax return. This interaction stays even if it's not a tax day, so you can review your expenses.
Types of Return
Approved Return - Sim gets $1000 - $5000 Simoleons.
Neutral Return - Sim gets no money, but you also do not lose Simoleons.
Rejected Turn - Sim loses $1000 - $5000 Simoleons.
Accept Sim-RS Return

Sim will get their Simoleons.
Pay Sim-RS Bill

Pay the Sim-RS bill.
Write Angry Sim-RS Letter

Sims who have to pay back Simoleons, can write an angry email to the Sim-RS.
Tax Relief

Sims who have to pay taxes back can apply for tax relief. But there's a 50/50 chance of getting tax relief. The amount can be anywhere from $500 - $2000 Simoleons.