The novel was paid 800 yuan a month and then received a publishing fee of 20,000 yuan. The author's fee for the novel should be calculated first. The author's fee was usually calculated by multiplying the word count by the unit price of the author's fee. Assuming that the total word count of the novel was 1 million words, the total remuneration for the novel would be 800 * 100000 = 8000000 yuan. Next, he needed to calculate the publishing fee. The publishing fee was usually calculated according to royalties. Royalty is calculated by multiplying the number of copies by the publishing fee. If the total number of words of the novel is 1 million, then the royalty calculation formula is: Royalty = number of copies x royalty rate. Royalty rates generally varied according to the number of words and the publishing house. According to the title description, the publishing fee was 20,000 yuan, so the royalty rate was 10%(20,000 divided by 1000000 = 002). Therefore, the royalty was 002 * 1000000 = 2000 yuan. Finally, he had to pay personal income tax. According to China's tax law, royalties and royalties were considered as income from the transfer of property and were subject to personal income tax. The specific tax rate and calculation formula of personal income tax are as follows: Contribution and royalty rates: - Contribution fee tax rate: The tax rate for royalties not exceeding 500 yuan is 3% - Royalty rate: Royalty rate is calculated as 10% of the total royalty income. The specific royalty rate depends on the situation. The calculation formula for personal income tax is: The amount of tax to be paid = royalties income x royalties tax rate + royalty income x royalty rate x (1-royalties tax rate)x(1-royalty tax rate) According to the title description, the novel is 800 yuan per month and then receives a publishing fee of 20,000 yuan. Therefore, the monthly royalties are 800 yuan and the royalties are 2000 yuan. Therefore, the monthly personal income tax should be: Individual income tax amount = 800 yuan x 3% + 2000 yuan x 10% + 2000 yuan x (1-3%)(1-10%) = 84 yuan + 186 yuan + 36 yuan = 360 yuan Therefore, if the monthly income is 800 yuan +20,000 yuan, you should pay 360 yuan of personal income tax.