Here are a few options for a description of the WordPress post tag “tax year” in Traditional Chinese, varying in formality and nuance:

**Option 1: Most Direct & Simple (Suitable for any context)**

* **Title:** 稅務年度 (Suìwù niándù)
* **Description:** 指的是稅務的申報及計算期間。 (Zhǐ de shì shuìwù de shēnbào jí jìsuàn qījiān.) – *Refers to the period for tax reporting and calculation.*

**Option 2: Slightly More Detailed (Good for general use)**

* **Title:** 稅務年度 (Suìwù niándù)
* **Description:** 稅務申報所適用的時間段，通常為一年。包括所得稅、營業稅等。 (Shuìwù shēnbào suǒ shìyòng de shíjiānduàn, tōngcháng wèi yī nián. Bāokuò suǒdéshuì, yíngyèshuì děng.) – *The time period applicable for tax reporting, usually one year. Includes income tax, business tax, etc.*

**Option 3: More Formal & Professional (Suitable for financial blogs or professional contexts)**

* **Title:** 稅務年度 (Suìwù niándù)
* **Description:** 依據稅法規定，用於納稅義務人申報其所得及應繳稅款的會計期間。 (Yījù shuìfǎ guīdìng, yòngyú nàshuì yìwù rén shēnbào qí suǒdé jí yīng jiǎo shuìkuǎn de huìjì qījiān.) – *As defined by tax law, the accounting period used by taxpayers to declare their income and tax payable.*

**Option 4: Focusing on the common yearly aspect:**

* **Title:** 稅務年度 (Suìwù niándù)
* **Description:** 一年一度的稅務申報期間。 (Yī nián yīdù de shuìwù shēnbào qījiān.) – *The annual tax reporting period.* This is slightly more informal and emphasizes the recurring nature.

**Key Considerations when Choosing:**

* **Target Audience:** Who are you writing this content for? The general public? Finance professionals?
* **Blog Topic:** What is the main subject matter of your blog? Will your content refer to business taxation, individual taxation, both, or something else?
* **Overall Tone:** Is your blog formal or informal?

Remember to choose the description that best suits your specific needs and content. Also, be sure to set the Slug (URL friendly version) to be: “shui-wu-nian-du” while setting the post tag. Good luck!