Tax
noun
The tax gold is what you have to pay when you have to pay a tax.
ぜいきん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
私の両親があなたを養子縁組したのは、ただ税金の控除を受けたかったのが理由です。
My parents only adopted you because they needed the tax deduction.