The tax system has so few deductions/credits, etc that the tax authority sends a bill to you twice a year based on reported income from your employer and you can either pay that amount or dispute what the employer filed. And, disputing or conversing with the tax authority is actually pretty easy.

Here is a story anyone who has dealt with the IRS may find hard to believe: I moved and forgot to notify the tax authority and did not receive the payment notification. I didn't think about it until after the 20-30 day grace period and was due a slight extra payment. I called the tax authority and explained the situation and provided proof of new address by dropping by their office and they waved the fine... simple, fast, no months of mail exchanges, etc.